{"id":21467,"date":"2023-05-10T14:33:54","date_gmt":"2023-05-10T19:33:54","guid":{"rendered":"https:\/\/www.polywater.com\/?post_type=solution-story&#038;p=21467"},"modified":"2025-06-25T03:48:18","modified_gmt":"2025-06-25T08:48:18","slug":"polywater-powerpatch-seals-beat-common-gasket-replacement-methods","status":"publish","type":"solution-story","link":"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/","title":{"rendered":"Polywater PowerPatch<sup>\u00ae<\/sup> Seals Beat Common Gasket Replacement Methods"},"excerpt":{"rendered":"<p>Not wanting to cause potential damage and major disruptions from a traditional gasket replacement, this company utilized Polywater PowerPatch to seal the entire failing gasket and all the nuts and bolts. Once completely sealed, the transformer was immediately put into operation and did not require any further maintenance.<\/p>\n","protected":false},"featured_media":21470,"template":"","meta":{"_acf_changed":false,"content-type":"","_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":""},"categories":[2993,2990,3018,2991,3004,3005],"industry-type":[2981],"class_list":["post-21467","solution-story","type-solution-story","status-publish","has-post-thumbnail","hentry","category-asset-life-extension","category-aging-transformers","category-equipment-maintenance","category-damage-to-field-assets","category-content-type","category-case-study","industry-type-electrical-infrastructure"],"acf":{"related":"","file":false,"related_articles_mode":"manual","subtitle":"How a company used PowerPatch to reduce the cost and downtime of a transformer main gasket leak. ","columns":[{"image":{"ID":21482,"id":21482,"title":"PowerPatch-The challenge frame","filename":"PowerPatch-The-challenge-frame.png","filesize":475092,"url":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame.png","link":"https:\/\/www.polywater.com\/en\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame.png","alt":"An old gray electrical transformer showing signs of aging and rust with a blue banner across the bottom of the image that says \"the challenge\".","author":"7","description":"","caption":"","name":"powerpatch-the-challenge-frame","status":"inherit","uploaded_to":21467,"date":"2023-05-04 17:22:16","modified":"2023-05-04 17:32:49","menu_order":0,"mime_type":"image\/png","type":"image","subtype":"png","icon":"https:\/\/www.polywater.com\/wp-includes\/images\/media\/default.png","width":980,"height":729,"sizes":{"thumbnail":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame-150x150.png","thumbnail-width":150,"thumbnail-height":150,"medium":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame-300x223.png","medium-width":300,"medium-height":223,"medium_large":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame-768x571.png","medium_large-width":768,"medium_large-height":571,"large":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame.png","large-width":980,"large-height":729,"1536x1536":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame.png","1536x1536-width":980,"1536x1536-height":729,"2048x2048":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame.png","2048x2048-width":980,"2048x2048-height":729,"gform-image-choice-sm":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame.png","gform-image-choice-sm-width":300,"gform-image-choice-sm-height":223,"gform-image-choice-md":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame.png","gform-image-choice-md-width":400,"gform-image-choice-md-height":298,"gform-image-choice-lg":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-challenge-frame.png","gform-image-choice-lg-width":600,"gform-image-choice-lg-height":446}},"title":"Minimize Moisture to Core","content":"<p>Oil leakage from the Bell Tank gasket and fastening bolts of a 260 MVA generating transformer posed a serious concern for a power generating utility. The asset manager was hesitant to expose the transformer core to atmospheric oxygen and moisture as is the case when traditional gasket replacement practices are used. Exposure to moisture and atmospheric gases creates deleterious interactions with the solid insulation and insulating oil, which can often cause premature failure of the transformer. The utility needed a sealant technology that allowed for the leak to be stopped in-situ without exposing the insulating oil and paper to these elements when lifting the bell tank needed before the gasket replacement process was to begin.<\/p>\n"},{"image":{"ID":21490,"id":21490,"title":"PowerPatch-The solution frame","filename":"PowerPatch-The-solution-frame-2.png","filesize":1087669,"url":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2.png","link":"https:\/\/www.polywater.com\/en\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2.png","alt":"All the components of a Polywater PowerPatch repair kit with a blue banner across the bottom of the image that says \"the solution\".","author":"7","description":"","caption":"","name":"powerpatch-the-solution-frame","status":"inherit","uploaded_to":21467,"date":"2023-05-04 17:50:11","modified":"2023-09-06 16:07:03","menu_order":0,"mime_type":"image\/png","type":"image","subtype":"png","icon":"https:\/\/www.polywater.com\/wp-includes\/images\/media\/default.png","width":980,"height":729,"sizes":{"thumbnail":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2-150x150.png","thumbnail-width":150,"thumbnail-height":150,"medium":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2-300x223.png","medium-width":300,"medium-height":223,"medium_large":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2-768x571.png","medium_large-width":768,"medium_large-height":571,"large":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2.png","large-width":980,"large-height":729,"1536x1536":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2.png","1536x1536-width":980,"1536x1536-height":729,"2048x2048":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2.png","2048x2048-width":980,"2048x2048-height":729,"gform-image-choice-sm":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2.png","gform-image-choice-sm-width":300,"gform-image-choice-sm-height":223,"gform-image-choice-md":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2.png","gform-image-choice-md-width":400,"gform-image-choice-md-height":298,"gform-image-choice-lg":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-solution-frame-2.png","gform-image-choice-lg-width":600,"gform-image-choice-lg-height":446}},"title":"PowerPatch Transformer Sealant","content":"<p>The utility contacted a service company specializing in leak repair, which recommended the use of <a href=\"https:\/\/www.polywater.com\/en\/product\/polywater-powerpatch-transformer-leak-repair\/\" target=\"_blank\" rel=\"noopener\">Polywater PowerPatch\u00ae<\/a> \u2013 a specialty sealant designed to arrest active oil and SF<sub>6<\/sub> gas leaks in transformers. A site visit was made to determine the amount of sealant required and to assess any points of limited access to the targeted seal area. The perimeter of the gasket was approximately 18 m in length and contained over 200 bolts, many of which had been over-tightened and leaked. The service company determined that the full perimeter and all bolts should be sealed with PowerPatch to ensure future leaks would not occur through unsealed areas once the pressure was restored.<\/p>\n"},{"image":{"ID":21478,"id":21478,"title":"PowerPatch-The result frame","filename":"PowerPatch-The-result-frame.png","filesize":563358,"url":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame.png","link":"https:\/\/www.polywater.com\/en\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame.png","alt":"An old greenish\/gray electrical transformer with a blue banner across the bottom of the image that says \"the result\".","author":"7","description":"","caption":"","name":"powerpatch-the-result-frame","status":"inherit","uploaded_to":21467,"date":"2023-05-04 17:22:11","modified":"2023-05-04 17:32:49","menu_order":0,"mime_type":"image\/png","type":"image","subtype":"png","icon":"https:\/\/www.polywater.com\/wp-includes\/images\/media\/default.png","width":980,"height":729,"sizes":{"thumbnail":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame-150x150.png","thumbnail-width":150,"thumbnail-height":150,"medium":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame-300x223.png","medium-width":300,"medium-height":223,"medium_large":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame-768x571.png","medium_large-width":768,"medium_large-height":571,"large":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame.png","large-width":980,"large-height":729,"1536x1536":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame.png","1536x1536-width":980,"1536x1536-height":729,"2048x2048":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame.png","2048x2048-width":980,"2048x2048-height":729,"gform-image-choice-sm":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame.png","gform-image-choice-sm-width":300,"gform-image-choice-sm-height":223,"gform-image-choice-md":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame.png","gform-image-choice-md-width":400,"gform-image-choice-md-height":298,"gform-image-choice-lg":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-The-result-frame.png","gform-image-choice-lg-width":600,"gform-image-choice-lg-height":446}},"title":"PowerPatch Saves Time and Money","content":"<p>The service team was dispatched to the site to perform the repair. PowerPatch was applied to the entire gasket perimeter along with all bolts and nuts.\u00a0 Once completely sealed, the transformer was immediately put into operation and did not require any further maintenance.<\/p>\n<p>As required by the utility, the sealing of this critical asset with PowerPatch, minimized the risks to oil and solid insulation from accelerated aging and premature failure. The on-site application of PowerPatch, allowed the power utility to reduce expenses significantly. PowerPatch helped to avoid transportation, heavy lifting equipment, power-shut down, oil removal and re-conditioning costs over gasket replacement.<\/p>\n<p>Read full story here: <a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/transformer-leak-repair-story-from-polywater\/\" target=\"_blank\" rel=\"noopener\">Transformer Leak Repair Story from Polywater\u00ae<\/a><\/p>\n"}],"graphic":{"image":false,"position":"none"},"select_related_articles":[{"post_identity":{"ID":13152,"post_author":"21","post_date":"2022-01-06 16:43:46","post_date_gmt":"2022-01-06 22:43:46","post_content":"<img class=\"alignnone size-full wp-image-12760\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/11\/Transformers-mag-header-image-crop.jpg\" alt=\"PowerPatch cartridge being deployed to seal leaks\" width=\"1900\" height=\"932\" \/>The fast and effective repair of power transformer oil or SF<sub>6<\/sub> leaks is an important part of a consistent power supply that minimizes economic losses for both power utilities and their customers. Ongoing transformer maintenance programs are critical to reliable electrical power generation and services. When immediate replacement of a transformer gasket is not feasible, a fast and reliable repair solution is required on location for a gasket oil leak. The following Leak Repair Story from Polywater will describe a leak repair scenario often encountered in the field: The repair of a generating transformer bell tank gasket leak in India where <a href=\"https:\/\/www.polywater.com\/en\/product\/polywater-powerpatch-transformer-leak-repair\/\">Polywater\u00ae PowerPatch\u00ae Leak Repair system<\/a> was used to repair oil leaks to maintain a reliable power supply.\r\n<h2><strong>Oil leakage problem to be resolved<\/strong><\/h2>\r\nAn Indian generation utility was preparing for overhauling its transformer fleet during a scheduled annual shutdown. However, oil leakage from the Bell Tank of a 260 MVA generating transformer (GT) gasket and bolts was a serious concern for its owner.\r\n<strong><img class=\"size-full wp-image-12772 alignright\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/11\/Transformer-at-time-of-site-visit-cropped.jpg\" alt=\"A transformer leak repair showing wear\" width=\"582\" height=\"316\" \/><\/strong>\r\n<h2><strong>Customer repair options<\/strong><\/h2>\r\nThe transformer owner had two options available to fix the gasket leak: gasket replacement or gasket leak repair. The former is an intrusive option as the transformer oil must be removed and the bell tank needs to be lifted to replace the gasket. The latter option, gasket leak repair, is a non-intrusive process where the leak is repaired from the outside, eliminating the need for lifting and oil removal.\r\n\r\nIn this case, the GT had provided reliable service for over a decade, but the asset manager was hesitant to expose the core of the transformer to atmospheric oxygen and moisture if traditional gasket replacement practices were to be used. It was also determined that the costs of lifting the active part of the transformer and oil treatment required for the intrusive replacement option would be high. The customer also needed to minimize the risk of opening a well operating transformer to expose it to atmospheric moisture. The chosen option for the upcoming shut-down needed to be a sealant technology that allowed for the leak to be stopped without the need for oil treatment and need to lift the bell tank.\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/the-aging-of-power-transformers\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>The Aging of Power Transformers<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2><strong>Minimum expectations\/trade-offs<\/strong><\/h2>\r\nThe Operations and Maintenance (O&amp;M) team of the generation utility had some minimum expectations for the gasket leak repair system. These were:\r\n<ul>\r\n \t<li>The oil leakage must be stopped completely<\/li>\r\n \t<li>The oil leakage should not reoccur for a number of years (3-5 years in most cases) OR at least up to the next planned shutdown<\/li>\r\n<\/ul>\r\n<h2><strong>Past experiences\r\n<\/strong><\/h2>\r\nIn previous years, the transformer owner had used its own repair teams to tighten the bolts on the cover of the transformer to stem the oil flow. This had been done enough times that further tightening would have been counter-productive due to the potential ageing of the gasket. The customer had also used its repair team and outside contractors in past shutdowns to stop oil leakage. Different sealant materials were used for these repairs, but they did not perform well with active gasket leaks. The most recent oil leak repair material had started to leak heavily from multiple points, so a more effective repair material needed to be identified and approved.\r\n\r\nThe generating plant\u2019s maintenance manager had attended a transformer maintenance workshop, TRAFOCARE, where he had seen a presentation and video of how leakage can be repaired without draining transformer oil, using Polywater PowerPatch Leak Repair System. The maintenance manager approached Polywater and their local application team, LeakXpert, for a solution to seal the gasket leak.\r\n\r\n<strong> <img class=\"wp-image-12785 size-medium alignleft\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/11\/PowerPatch-Cartridge-Kit-cropped.jpg\" alt=\"The PowerPatch kit components\" width=\"300\" height=\"160\" \/><\/strong>\r\n<h2><strong>PowerPatch Leak Repair System<\/strong><\/h2>\r\nThe application team first presented the capabilities of the Polywater PowerPatch to ensure that it met the requirements of the repair to be done. PowerPatch is specially formulated for use with high-voltage electrical equipment. This advanced sealant is based on multi-polymer technology and is used to repair both oil and SF<sub>6<\/sub> leaks. It offers the physical and electrical characteristics required in generating plant operations.\r\n\r\nBelow are some of the features of PowerPatch that made it the right leak repair technology for this application:\r\n<ul>\r\n \t<li>PowerPatch has dielectric properties similar to other components inside the transformer, such as oil and solid insulation. This compatibility reduces the risk of partial discharge and its damaging effects on transformer performance.<\/li>\r\n<\/ul>\r\n<ul>\r\n \t<li>Flexible and easily removed - the PowerPatch allows for the expansion and contraction caused by frequent load changes and vibrations common for Its high adhesion to the repaired surface resists pressures up to 1.4 MPa on steel to withstand these high mechanical forces. Although strong, it can be easily removed if used as a short- term repair.<\/li>\r\n \t<li>PowerPatch is resistant to weathering such as UV exposure and to temperature It has been environmentally aged in extreme conditions, including rain, snow, sleet, and UV with an in-use temperature range of -40 \u00b0C to 150 \u00b0C (-40 \u00b0F to 300 \u00b0F).<\/li>\r\n<\/ul>\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/mapping-transformer-populations\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>Mapping Transformer Populations<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nThese features of PowerPatch met the requirements that the transformer owner needed to ensure reliable power production. But, before making the final decision if PowerPatch was the right choice for the gasket repair, an on-site visit to assess the transformer\u2019s physical surroundings was requested.\r\n\r\nEach transformer oil leak is different. Many transformer bell-tank perimeters can be as long as 18 meters (60 ft.) in length and can contain over 200 bolts. When repairing a gasket leak, the entire length of the gasket must be sealed. If only the oil leak area is sealed, the oil can migrate to unsealed areas and leak again. The bolts holding the tank tightly to the transformer must also be sealed. If not, once the tank\u2019s full perimeter is sealed, the oil will follow through the path with the least resistance and start to leak through the bolt threads.\r\n\r\nWith these issues in mind, the LeakXpert team visited the generating plant to survey the transformer to determine the amount of sealant required and to assess any points of limited physical access to the area to be sealed. The repair team found some areas behind marshalling boxes that would make the application of the sealant difficult. The LeakXpert team informed the customer about these areas, and the customer agreed to remove the boxes before the gasket repair began. The visit also revealed that the previously applied sealant would require much time and effort to remove.\r\n<h2><strong><img class=\"alignnone size-full wp-image-12780\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/11\/Removing-Old-Material-cropped.jpg\" alt=\"A worker removes a previous broken leak repair\" width=\"1400\" height=\"788\" \/>Removal of previous sealant material<\/strong><\/h2>\r\nBefore the repair process could start, the leaking sealant material that was previously applied had to be removed. In many cases, this removal process is the most time-consuming part of a gasket repair. Various materials have been used in the past that are difficult to remove. These range from rubberized materials to hard resin compounds. They all must be scraped off with chisels or grinding wheels, a physically demanding task, which often leaves residual materials on the repair surface that then must be removed with strong cleaning solvents. This makes PowerPatch\u2019s removability an advantage if used as a temporary seal on a transformer awaiting replacement parts.\r\n\r\nThe LeakXpert team removed the old material from the GT over two days. Once removed, the surface was wiped clean with an environmentally friendly cleaner. It was then time to start the PowerPatch application procedure.\r\n<h2><strong>The repair process<\/strong><\/h2>\r\nThe application process to seal the bell tank leak is very important. Migration of oil along the path of least resistance is very common. To minimize this problem, instead of starting the repair process at points of the active leak, non-leaking lengths of the tank\u2019s perimeter and bolts are sealed first. Then lengths adjacent to these non-leaking areas are sealed. This process continues, moving closer and closer to the points of active leakage. Once the active leak point is reached, it is sealed. This sealing process ensures that the leak will be completely repaired, preventing the oil from migrating to unsealed areas along the perimeter of the tank.\r\n<img class=\"alignnone size-full wp-image-12776\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/11\/Surface-Preparation.jpg\" alt=\"A transformer showing wear\" width=\"715\" height=\"402\" \/>\r\n<h2><strong>Surface preparation<\/strong><\/h2>\r\nOnce the previously applied material was removed, the steel surface on which the PowerPatch was to be applied needed to be sanded and wiped clean. This step\u2019s goal was to remove paint and contamination that can reduce adhesion of PowerPatch to the repair area. In addition, the sanding or grinding of the metal surface helps to increase the surface area to which the PowerPatch adheres, giving the seal greater strength. In many gasket repairs, the leak appears to arise from one point when the origin of the gasket leak may be quite far away. Polywater\u2019s experienced repair team, LeakXpert, used the surface preparation step to distinguish areas of active leaks containing true points of leakage from those that did not.\r\n<h2><strong><img class=\"wp-image-12789 size-medium alignleft\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/11\/Sealing-non-active-leaks-scaled.jpg\" alt=\"Sealing non-active leaks with Polywater PowerPatch\" width=\"300\" height=\"169\" \/>Sealing non-active areas<\/strong><\/h2>\r\nThe steps required in the application of PowerPatch depend on the type of leak, active or non-active. In a typical gasket leak repair, most of the main tank perimeter does not have active leakage, but there is often the oil that has migrated from actively leaking areas. The process for sealing non-active leaks is easier than for active leaks. Any oil accumulated in non-active leak areas must be cleaned, and then the permanent PowerPatch resin should be applied directly onto the metal of the transformer. This process should be done repeatedly at lengths of 2-3 meters (6-10 ft.) until approaching an active leak area. The permanent PowerPatch resin has strong adhesion to the metal surface and cures quickly. A functional cure can be reached with- in one hour after application at 20 \u00b0C (68 \u00b0F).\r\nPowerPatch Repair Sealant - the PowerPatch two-part permanent repair resin was applied from a cartridge and mixing nozzle in this repair. The application tool was used to inject resin components from the cartridge into the mixing nozzle. In the nozzle, they are accurately metered and thoroughly mixed to ensure reliable sealing performance. Unlike other sealants that require proportion measurement and hand-mixing, all PowerPatch packages are premeasured to offer consistent curing times, strength and durability for excellent sealing results.\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/how-oxygen-and-acids-influence-the-aging-of-transformers\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>How Oxygen and Acids Influence the Aging of Transformers<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nSometimes it is difficult to know if the presence of oil is a result of an active leak or oil migration from another leak area. In the case of the gasket repair on the GT, the LeakXpert team was not sure of the source of the oil on certain spots of the tank perimeter. In these areas, they used the repair process for active leaks described below.\r\n<h2><strong><img class=\"size-full wp-image-12764 alignright\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/11\/Sealing-Active-Leaks-with-Cartridge-cropped.jpg\" alt=\"A man in a blue hat works on sealing a transformer leak\" width=\"600\" height=\"337\" \/>Sealing active leaks<\/strong><\/h2>\r\nActive leaks can be detected as seepage accumulating on the surface of the trans- former or as droplets of oil falling from the leak area. In the Surface Preparation photo (Step 1), droplets of oil can be seen dripping from the prepared surface. Once adjacent non-leaking areas have been sealed, active leakage points are now ready to be repaired.\r\nSealing active leaks takes an additional step. This step aims to stop the active leak to allow for proper surface preparation and the application of the permanent PowerPatch material as described in the previous section. After abrasion and cleaning the leak area, a fast-curing putty is applied directly over the active leak and held under hand-pressure until it hardens. This takes typically 5-7 minutes, depending on temperature. Once hardened, surface preparation is done again, including sanding, grinding and cleaning around the putty. When properly prepared and cleaned, the permanent PowerPatch resin is applied directly over the putty and then spread one (1) cm (0.4 in.) beyond the edges of the putty at all points. When the PowerPatch resin hardens and cures, it forms a strong and durable seal.\r\n\r\n<img class=\"alignright wp-image-12768 size-full\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/11\/Step-4-oil-leakage-is-successfully-arrested-cropped.jpg\" alt=\"A transformer showing wear\" width=\"605\" height=\"365\" \/>The repair of an active leak can be difficult, especially for inexperienced repair teams. The LeakXpert team\u2019s extensive experience using PowerPatch putty and the permanent PowerPatch sealant to stop active leaks allowed for the GT gasket to be sealed quickly and efficiently. More importantly, the PowerPatch offered an un-intrusive alternative to traditional gasket replacement that required less time and money.\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/mapping-as-risk-and-cost-assessment-methodology\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>Mapping as Risk and Cost Assessment Methodology<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2><strong>Summary<\/strong><\/h2>\r\nResilient and cost-effective maintenance of the grid using innovative technologies like PowerPatch from Polywater helps sustain the critical systems in operation. The GT\u2019s owner opted for PowerPatch because of its ability to withstand mechanical expansion\/contraction and its high dielectric strength matching the electrical properties of the other components within the transformer. The intrusive processes required to replace a large oil tank gasket can take twice as long and be three times costlier than the Polywater leak repair option. The Polywater PowerPatch Leak Repair System used by LeakXpert in the repair of the GT was less time consuming, less expensive than conventional gasket replacement and did not expose the core to atmospheric gases and moisture.\r\n<h2>Have any questions?<\/h2>\r\n<button class=\"button button--primary\" data-micromodal-trigger=\"polywater-modal--email-us-form\">Email Us <\/button>\r\n\r\n<em>Originally published in Transformers Magazine, Volume 8, Issue 2, 2021<\/em>","post_title":"Transformer Leak Repair Story from Polywater\u00ae","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"transformer-leak-repair-story-from-polywater","to_ping":"","pinged":"","post_modified":"2025-05-19 10:47:27","post_modified_gmt":"2025-05-19 15:47:27","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.polywater.com\/?p=13152","menu_order":388,"post_type":"post","post_mime_type":"","comment_count":"0","filter":"raw"}},{"post_identity":{"ID":13151,"post_author":"21","post_date":"2022-01-06 16:44:13","post_date_gmt":"2022-01-06 22:44:13","post_content":"<img class=\"size-full wp-image-12796 aligncenter\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/12\/Cost-Effective-advertorial-Top-photo-crop.jpg\" alt=\"An old Transformer\" width=\"900\" height=\"600\" \/>Electrical energy generation and distribution have been essential factors in the economic development and progress in many regions of the world. Many countries are focused on expanding and maintaining their electrical grids to provide dependable and reliable energy to meet the growing energy needs. According to the World Bank, a billion people worldwide still live without electricity, and hundreds of millions more live with unreliable or expensive power. An important element to reliable access to affordable electricity is the consistent operation of the many power transformers in the power grid. Their performance in substations and switchyards is essential for a properly functioning grid. The supply of electricity through this network of power transformers depends on their continuous operation. One issue that impacts the continuity and quality of the electrical service supplied by power transformers is the leakage of dielectric oil used to dissipate the heat generated during their operation. Quick and cost-effective repair of transformer oil leaks ensures reliable performance of the electrical network. The use of innovative sealant technology from Polywater\u00ae for in-field repair of performance-degrading transformer oil leaks will be reviewed below. Compared to traditional repair processes, the use of Polywater sealant technology has proven many times to be a faster and more cost-effective oil leak remediation method.\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/transformer-leak-repair-story-from-polywater\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>Transformer Leak Repair Story from Polywater\u00ae<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nOil leaks are generated in a variety of ways, through pinholes, welding defects, worn gaskets and radiator cooling fin corrosion or rust. The loss of dielectric fluids from a power transformer has many deleterious effects. High temperatures within the transformer due to oil loss affect the quality and dependability of the supply of power. Additionally, high heat contributes to accelerated decomposition of the solid insulation which leads to accelerated aging of the transformer. Leaks also provide a gateway for atmospheric gases, such as oxygen and nitrogen, into the transformer. They degrade oil quality and further accelerate cellulosic depolymerization. Any oil leak, no matter how small, is an open pathway for moisture to enter the transformer. Water in a transformer reduces its useful life and puts at risk the coordinated operation of the transformer in the electrical grid. The reduction in the number and severity of transformer oil leaks is critical to improved grid performance and power quality.\r\n\r\nCorrecting problems caused by oil leaks can be very complicated, costly, and time-consuming. Often, conventional remediation processes require long shutdowns of power to the transformer, which reduce revenue generation while repairs are being made. Processes that minimize the time to repair\/replace significantly lower the opportunity costs of lost service revenue. To better understand the financial impact of different corrective actions in the repair of power transformer leaks, we will assess examples where conventional corrective processes are compared to in-field sealant repair technologies. We compare traditional gasket replacement to gasket leak repair using <a href=\"https:\/\/www.polywater.com\/en\/product\/polywater-powerpatch-transformer-leak-repair\/\">Polywater\u2019s PowerPatch\u00ae leak repair system<\/a> and assess the time and cost needed for each process to stop an oil leak in the bell tank gasket. It will be assumed that the transformer is in proper functioning condition, but the nitrile gasket has failed. We start below with a description of the conventional process used to replace a leaking gasket of a power transformer at a power company in Lima, Per\u00fa.\r\n<h2><strong>Description and characteristics of a transformer gasket leak:<\/strong><\/h2>\r\n<strong>Electrical:<\/strong> 22 MVA \u2013 60 \/ 13.8 kV - 192 5 \/ 920 4 A - group YNd11\r\n<strong>Weights:<\/strong> Active parts 18,600 kg - oil 8,900 kg - tank 4,000 kg \u2013 total weight 37,100 kg\r\n<strong>Defect:<\/strong> Oil leak from the main gasket between the tank and tank cover\r\n<strong>Work required:<\/strong> Replacement of gasket between the main tank and tank cover\r\n<strong>Equipment to be used in repair:<\/strong> 30 ton telescopic crane, holding tank with a minimum capacity of 3,000 l (2,600 kg), oil treatment system with a minimum oil treatment capacity of 5,000 l \/ h, power unit of 80 to 100 kW (in the event there is no energy source), tool kit, instruments, safety equipment, service materials, (gloves, insulated blankets, grounding cables), and auxiliary equipment (chain blocks, hoists)\r\n<strong>Required personnel:<\/strong> 3 to 4 electro-mechanical technicians\r\n<h2><strong>Description of the work required to replace the gasket:<\/strong><\/h2>\r\n<ul>\r\n \t<li>Shut down energy to the transformer<\/li>\r\n<\/ul>\r\n<ul>\r\n \t<li>Verify that energy to the transformer has been shut down<\/li>\r\n \t<li>Place medium and high voltage grounding terminal blocks<\/li>\r\n \t<li>Disconnect input, output, and control cables<\/li>\r\n \t<li>Position telescopic crane for lifting the top of the transformer<\/li>\r\n<\/ul>\r\n<img class=\"alignright wp-image-12818 size-medium\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/12\/Oil-tank-gasket.png\" alt=\"Oil tank gasket\" width=\"300\" height=\"142\" \/>\r\n<ul>\r\n \t<li>Transfer transformer oil to holding tank and to draw down oil level to 20 cm (7.9 in) below oil tank top<\/li>\r\n \t<li>Loosen 60 x top bolts of 1.58 mm (5\/8 in) from the oil tank<\/li>\r\n \t<li>Connect rigging to lift the active part of the transformer<\/li>\r\n \t<li>Lift active part to 20 - 30 cm above the top of the tank to provide access to the gasket<\/li>\r\n \t<li>Remove original gasket material, clean the surface where the old gasket was positioned, and place the new gasket<\/li>\r\n \t<li>Lower active part of the transformer into the tank<\/li>\r\n \t<li>Place and adjust top bolts to the tank and remove the crane<\/li>\r\n \t<li>Treat dielectric fluid in the holding tank over two consecutive cycles to obtain a relative humidity of 5 ppm in the transformer oil<\/li>\r\n \t<li>Transfer oil from the lower valve of the transformer through the oil treatment system to the holding tank<\/li>\r\n \t<li>Treat oil in the transformer to obtain a relative humidity of 5 ppm of the transformer oil<\/li>\r\n \t<li>Take final sample and test dielectric fluid. Acceptable result: not less than 40 kV \/ 2 mm (ASTM D1816 for in-service oil).<\/li>\r\n \t<li>Reconnect input, output, and control cables<\/li>\r\n \t<li>Remove earthing cables and other extraneous materials from the transformer<\/li>\r\n \t<li>Allow settling time of at least 2 hours<\/li>\r\n \t<li>Purge Buchholz relay and high and medium tension insulators<\/li>\r\n \t<li>Reenergize the transformer<\/li>\r\n<\/ul>\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/the-aging-of-power-transformers\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>The Aging of Power Transformers<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nThe traditional replacement process described above is very time consuming and capital equipment intensive. It is estimated that this process would require at least 24 hours of continuous monitoring and the use of technically specialized auxiliary equipment. Alternatives to the process outlined above have been tried to reduce the time and cost of repairing a leaking gasket. A range of products, including sealants, have been used. These repair options do not effectively stop gasket leaks. Many of the products used were developed for other applications and not tested appropriately for the repair of persistent, dielectric fluid leaks through worn gaskets. Polywater\u2019s PowerPatch Leak Repair System is designed for the repair of a wide variety of transformer leaks and has been used successfully in many countries around the world. The remediation of a gasket leak using PowerPatch is described below.\r\n<h2><strong>Polywater PowerPatch for in-field repair of active leaks<\/strong><\/h2>\r\nPolywater\u2019s fast-curing, two-part resin sealant is designed for the temporary or permanent repair of transformer leaks. The PowerPatch Leak Repair System has been used successfully to contain and seal a wide range of active leaks encountered in the field. Once applied and cured, PowerPatch seals have exhibited superior strength against leaks of dielectric fluids and insulating gases such as SF<sub>6<\/sub>. When an active oil leak is found, immediate plans must be made to stop the leak in a fast, efficient, and cost-effective manner. As described above, achieving these objectives using conventional replacement processes is often difficult. Oil tank gasket leaks are time-consuming and costly to rectify with conventional methods. Replacing nitrile or cork gasket materials used to seal the main oil tank requires heavy equipment to lift the top and active part of the transformer to gain access to the gasket. Opening the tank exposes the transformer oil to moisture and atmospheric gases, which require oil treatment to reduce their deleterious effects. This is another time-consuming step in the conventional leak repair process and requires the use of costly oil treatment systems.\r\n\r\nThe PowerPatch Leak Repair System offers a safe and effective alternative to conventional gasket replacement. Instead of replacement, the PowerPatch system is used to seal the perimeter of the tank cover to stop active oil leakage. There is no need to lift the top off the tank, which limits exposure of the oil to the harmful effects of water and gases. The costs and time required for oil treatment also are eliminated when PowerPatch is used.\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/mapping-transformer-populations\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>Mapping Transformer Populations<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nAmong the many features of PowerPatch, its high-pressure resistance is noteworthy. For example, its resistance to pressure when adhered to steel is over 13.7 bar (199 psi). PowerPatch also adheres strongly to other materials often found in transformer components such as copper, brass, and ceramic. The capacity of PowerPatch to resist high pressure allows its use on large oil-filled power transformers and in sealing leaks in SF<sub>6 <\/sub> insulated switchgear. Another valuable feature of PowerPatch is its high dielectric breakdown voltage. Similar to that of transformer oil, the use of Polywater\u2019s PowerPatch minimizes the potential for partial discharge in the transformer.\r\n<h2><strong>Gasket leak sealing with\u00a0PowerPatch<\/strong><\/h2>\r\nFollowing the above example of conventional methods to replace leaking gaskets, we will describe the application process to seal an actively leaking gasket between the top and the oil tank on the same trans-former using the PowerPatch system. Instead of replacing the entire gasket as done in the conventional process, we use PowerPatch to seal the perimeter of the oil tank. In addition, the nuts and bolts that secure the cover to the tank will be sealed to prevent oil from leaking through the bolt threads.\r\n<img class=\"size-full wp-image-12810 aligncenter\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/12\/Repair-area-before-and-after.jpg\" alt=\"Repair area, before and after\" width=\"1580\" height=\"201\" \/>\r\n\r\n<strong>Necessary personnel:<\/strong> 5 - 6 electro-mechanical technicians\r\n<h2><strong>Description of the work to be performed to seal the gasket:<\/strong><\/h2>\r\n<ul>\r\n \t<li>Shut down energy to the transformer<\/li>\r\n \t<li>Verify that energy to the transformer has been shut down<\/li>\r\n \t<li>Disconnect input, output, and control cables<\/li>\r\n \t<li>Prepare the surface of the gasket perimeter and tank cover where the PowerPatch will be applied. This initial step is very important to create a tight seal. Proper preparation includes abrading surfaces with sandpaper, metal brush, or a rotating metal brush connected to an electric drill. Note that abrasion increases surface area to improve adhesion. Additional surface preparation includes cleaning to remove paint and any contamination or residue from the surface that may compromise strong adhesion.<\/li>\r\n \t<li>Apply quick-curing putty to stop actively leaking oil; apply the putty along the entire perimeter of the tank \/ tank cover; once putty is hardened, inspect the entire perimeter to verify that all leaking has stopped<\/li>\r\n \t<li>Perform secondary cleaning by abrading the surface and removing surface residue after application of the putty<\/li>\r\n \t<li>Apply the permanent sealing resin directly over the hardened putty along the tank\u2019s perimeter and to the bolt heads and nuts<\/li>\r\n \t<li>After application of the permanent resin is complete, remove all safety equipment on or around the transformer<\/li>\r\n \t<li>Remove earthing cables and any other extraneous materials in and around the transformer<\/li>\r\n \t<li>Reenergize the transformer<\/li>\r\n<\/ul>\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/how-oxygen-and-acids-influence-the-aging-of-transformers\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>How Oxygen and Acids Influence the Aging of Transformers<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nWe can see that the use of PowerPatch to seal a transformer oil tank gasket leak reduces the time required for the corrective process. In addition, PowerPatch offers positive economic benefits, which include savings from the sealing process itself, time and from the lower opportunity costs of service shutdown. A comparison of the savings and costs between the complete gasket replacement and leak sealing processes are shown in Table 1.\r\n<h2><strong>PowerPatch<\/strong><\/h2>\r\nThe PowerPatch family of leak repair sealants allows for the safe and economical repair of oil and gas leaks in a variety of transformer and switchgear equipment. The multi-use PowerPatch cartridges (EPCT) are designed for repairs as small as pinholes in cooling radiator fins and valves and as large as oil tank main gasket repair. The application of the permanent resin described above can be applied with either 50 or 250 ml PowerPatch cartridges. The 50 ml cartridge is ideal for smaller repairs, while the 250 ml cartridge can be used for medium or larger repairs such as those found around flanges and bushings. The cartridges\u2019 reusability minimizes resin waste to reduce repair costs. The two-part resin cartridges ensure accurate mixing of Parts A and B to ensure maximum adhesion and consistent working times.\r\n<img class=\"size-full wp-image-12785 alignright\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/12\/PowerPatch-Cartridge-Kit-cropped.jpg\" alt=\"The PowerPatch kit components\" width=\"800\" height=\"427\" \/>\r\n\r\nOther PowerPatch packages are available for other types of transformer repairs. The EP package consists of two small containers of resin Parts A and B. They are mixed manually, after which the combined resin can be applied with a wooden spatula to irregularly shaped areas needing repair. Both EPCT and EP packages include a quick-setting putty stick for the repair of active oil leaks, as described in the leak repair process above. PowerPatch Slow Cure (EPSC) comes with 290 ml of Parts A and B and is used for large-area repairs. Its use is recommended for large, high-voltage transformers where the slower cure time of ESPC ensures sufficient working time for applying resin to the repair area.\r\n<h2><strong>Summary<\/strong><\/h2>\r\nThe proper functioning of oil and SF<sub>6<\/sub> insulated equipment, essential components of electrical grids around the world, is critical. The quick and cost-effective repair of power transformer leaks ensures reliable and high-quality electrical services to homes, businesses, and industries. Using versatile and innovative sealant technology from Polywater for on-site repair of oil leaks has been shown to lower both the cost and time required. The use of Polywater\u2019s PowerPatch leak repair products reduces transformer shutdown time from 24 hours to 8 to 10 hours and also results in much lower costs. The costs of lifting cranes, oil treatment systems, and other equipment needed for on-site gasket replacement were over $10,000 higher than using the PowerPatch Leak Repair System.\r\n<img class=\"alignnone size-full wp-image-12822\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2021\/12\/Table-1-Comparison.jpg\" alt=\"Table 1 Comparison\" width=\"1093\" height=\"438\" \/>\r\n<h2>Have any questions?<\/h2>\r\n<button class=\"button button--primary\" data-micromodal-trigger=\"polywater-modal--email-us-form\">Email Us <\/button>\r\n\r\n<em>Originally published in <a href=\"https:\/\/transformers-magazine.com\/\">Transformers Magazine<\/a>, Volume 7, Issue 4, 2020<\/em>","post_title":"Cost Effective On-Site Leak Repair of Power Transformers","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"cost-effective-on-site-leak-repair-of-power-transformers","to_ping":"","pinged":"","post_modified":"2025-05-19 15:33:39","post_modified_gmt":"2025-05-19 20:33:39","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.polywater.com\/?p=13151","menu_order":151,"post_type":"post","post_mime_type":"","comment_count":"0","filter":"raw"}},{"post_identity":{"ID":645,"post_author":"21","post_date":"2020-09-01 14:39:11","post_date_gmt":"2020-09-01 19:39:11","post_content":"<h2><strong>Abstract<\/strong><\/h2>\r\nGeneration, start-up and auxiliary transformers are typically designed for specific functions within an operating block in a power plant. \u00a0The planning, manufacture and installation of custom-designed power transformers can take many years to complete.\u00a0 Once in operation, the premature failure of these critical assets before their expected End of Life (EOL), can be devastating to the electric utility or industrial company owner. The mapping process aids in the proactive identification of those transformers which may create the most economic and performance risk. The process helps to identify remediation, conservation and conditioning actions which ensure that these critical assets function throughout their planned lifetime.\r\n<h2><strong>Introduction<\/strong><\/h2>\r\nOur article <a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/mapping-transformer-populations\/\" target=\"_blank\" rel=\"noopener\"><strong>Mapping Transformer Populations<\/strong><\/a> focused on the use of the mapping process as a starting point to determine the appropriate remediation and conservation measures that your maintenance team needs to take to ensure a transformer block subjected to accelerated aging performs over the long-term. This article expands on mapping and risk assessment to identify the actions required to extend the operating lifetimes of transformers subjected to other forms of risk like design and random external risks.\u00a0 In cases of these risks, the mapping process generates different remediation and conservation strategies to ameliorate and control them. These strategies are then compared so that the option that best balances risks can be implemented with an evaluation of operational and financial considerations.\u00a0 We use a hypothetical example, based on typical field experience, to illustrate these concepts.\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/mapping-transformer-populations\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>Mapping Transformer Populations<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2><strong>Types of Risk<\/strong><\/h2>\r\nA transformer block is a complex system.\u00a0 The transformers and auxiliary equipment that comprise an operating block are interconnected and must function as designed for the block to meet operational objectives over an extended period.\u00a0 The issues of accelerated aging and its effect on premature failure already have been addressed in previous articles.\u00a0\u00a0 A transformer block can also be at risk due to poor design and\/or workmanship which create functional weaknesses in a transformer. These, in turn, can cascade throughout the system to cause outages, fires or other system performance issues in the transformer block.\u00a0 Defects such as poor welded joints or defective head gasket sealing can increase risk of failure of an individual piece of equipment or the entire transformer block.\u00a0 \u00a0Random factors such as lightning strikes, natural disasters or short circuiting create another form of risk difficult to predict.\r\n\r\nThe term End of Life (EOL) is commonly used to describe the time at which a transformer becomes inoperable.\u00a0 This term is imprecise as it does not convey the actions that can be taken to reduce the risks that most affect a transformer block.\u00a0 These actions could include oil reconditioning and monitoring in the case of accelerated aging or creating redundancy in the system to protect from the abrupt failure of critical assets.\u00a0 A useful term, used in this article, is remaining substance (RS), which conveys the concept of a valuable asset that can be consumed or conserved depending on how the risks are managed. The decline in RS is exponential if the appropriate measures are not proactively taken. \u00a0It is important to institute the remedial and\/or conservation measures early enough so RS can be preserved in good operating condition throughout the required operating lifetime of the transformer.\u00a0 Field experience suggests that once RS reaches 60%, the remaining operating life of the transformer is only six years.\u00a0 By taking proper and timely action to manage risk factors, the transformer\u2019s lifetime can be extended by another 10 to 15 years.\u00a0 The chart below depicts the trajectories of RS with and without conservation measures.\r\n\r\n<img class=\"size-full wp-image-646 aligncenter\" src=\"https:\/\/polywaterv2.wpengine.com\/wp-content\/uploads\/2020\/09\/Transformer-Aging-profile.png\" alt=\"\" width=\"936\" height=\"504\" \/>\r\n\r\nWater content measurements under 2% to greater than 3% comprise a range from which accelerated aging is measured. Proper sealing design is one means to reduce the impact of O<sub>2<\/sub> on depolymerization.\u00a0 Partial degassing has proven to be an effective means to restore O<sub>2<\/sub> levels to 30% of its saturated values.\r\n\r\n<strong>Type 1 Failures<\/strong>-Age related degradation of electro-mechanical assemblies such as bushings, OLTCs and of solid insulation can contribute to transformer block failure.\u00a0 The risks caused by accelerated aging are quantified in the mapping process through DGA and transformer fluid testing.\u00a0 These testing procedures provide indications of the level of depolymerization of the solid insulation in the transformer as it cannot be measured directly.\u00a0 The level and rate of exposure of cellulose to aging accelerators such as high temperature, moisture, oxygen (O<sub>2<\/sub>) and acids are the starting points to this process.\u00a0 These influence the physical and electrical properties of the transformer and influence the rate of accelerated aging.\r\n\r\nType 1 risks are accurately determined with today\u2019s increased sophistication of test methodologies and technologies.\u00a0 Once the effects of the accelerators are quantified, measures to conserve the cellulose insulation can be undertaken to extend the lifetime of the transformer.\u00a0 These measures include gas monitoring and oil regeneration. \u00a0If managed properly, Type 1 risks can be controlled to slow age related degradation and EOL of a transformer. It is important to understand that even when the proper actions are taken, the transformer will continue to age but at a slower rate than otherwise.\u00a0 This means that the probability of failure from type 1 risks increases with time.\r\n\r\n<strong>Type 2 Failures<\/strong>- Inadequate design or poor construction of a transformer often cause sudden EOL conditions. The inadequate design of a transformer\u2019s cooling system creates overheating, which in turn contributes to accelerated aging and a higher probability of premature failure. Poor workmanship on welding joints results in gateways for oil leakage or the ingress of moisture and atmospheric gases into the transformer, which again cause accelerated aging leading to premature failure. Type 2 risks can develop when the poor design or poor-quality workmanship of a new transformer causes the premature failure of the transformer, resulting in significant lost revenue and repair\/replacement costs. Understanding how the new equipment reacts to actual field conditions when connected to existing equipment in the block takes time.\r\n\r\nThe probability of Type 2 failures begins at a high level, but with time, it declines as the transformer is checked and adjustments are made to optimize its performance.\u00a0 Proper vetting can take years before the probability of failure reaches normal levels.\r\n\r\n<strong>Type 3 Failures<\/strong>-External influences such as lightning or short-circuits often generate sudden and catastrophic transformer failures. The risk from a lightning strike is unquantifiable due to the uncertainty of the timing and severity of the strike. However, the short circuit of a third-party grid or station transformer also can create this type of risk. Type 3 risk is uncontrollable and random. Type 3 risks are incorporated into the mapping process by focusing on the transformers, which are most exposed to this uncertainty.\r\n\r\nThe uncertainty surrounding Type 3 failures makes them difficult to predict.\u00a0 As such, the cost in the event of a Type 3 failure, is often used as a proxy for the risk. These measures include lost revenue from a loss of power production over some period or the cost of buying power on the open market.\u00a0 Type 3 risk does not increase or decrease over time and can be thought of as a uniform probability distribution over the lifetime of the block. Type 3 failures are especially dangerous when they affect weakened assets which cause a cascade of outages to other units in the block.\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/transformer-leak-repair-story-from-polywater\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>Transformer Leak Repair Story from Polywater\u00ae<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2><strong>Reasons for Mapping<\/strong><\/h2>\r\nAll transformers are exposed to various risks.\u00a0 They age over time causing premature failure. Their poor design can create functional weaknesses, which are only detected when operating over time. Random weather or grid related risks can cause complete transformer block shutdown. The mapping process described in this article is used to identify the risk to which a transformer block is exposed and what actions are needed to counteract the negative impact they have on performance. The process also considers the objectives of the plant owner which may include timing of plant shutdown or operating extensions, financial or safety goals. \u00a0If not maintained properly, the original financial justification of the transformer and functional block in which it operates may not be reached.\u00a0 The final outcome of the mapping process is to provide multiple options that the plant owner can select based on an acceptable level of risk and required economic commitment.\r\n<h2><strong>The Mapping Process<\/strong><\/h2>\r\nThe mapping process consists of eight steps.\u00a0 Each step builds on the next resulting in the evaluation of different long-term replacement, remediation and conservation actions that can be taken to reduce the risks of EOL. These action plans identify their associated costs and risks to enable the transformer block operator to select the actions best suited to meet the objectives of the plant.\r\n\r\nThe steps in the mapping process will be described using the following scenario:\r\n<h3><strong>Scenario Description<\/strong><\/h3>\r\nIn order to ensure that the transformers in a combined heat &amp; power plant (CHP) would operate until its planned shutdown in six years, a preservation plan was developed for the plant. The initial phase of this plan was to regenerate insulating fluid for high voltage, start-up and station supply transformers.\u00a0 One year after the start of the preservation plan, the second phase of conditioning and conservation actions to one of the Generation Step Up Units (GSU) began when a transportable conditioning unit was installed.\u00a0 In the third year of the conservation process a second transportable conditioning unit was installed to further augment the conditioning of a second GSU transformer.\r\n\r\nThe data being collected from on-line gas monitoring systems over the first three years of the lifetime extension program provided a significant amount of baseline information on the trend of RS. The analysis of this data raised the possibility of a longer lifetime extension.\u00a0 Because of this, it was decided to augment the assessment of critical assets in the plant. The scope was changed to include the evaluation of three scenarios where the cost and risks of a longer operating period would be evaluated.\u00a0 The three scenarios would allow the plant owner to compare the different alternatives so that he could determine whether a further ten-year extension was feasible and, if so, which course of action would be optimal. The motivation for this broader scope was to determine if the plant could continue to generate power and heat production revenues at a reasonable cost without incurring significant operating risks.\r\n\r\nThe Mapping steps to accomplish this broader assessment of the CHP follow:\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/cost-effective-on-site-leak-repair-of-power-transformers\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>Cost Effective On-Site Leak Repair of Power Transformers<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h4><strong>Mapping Step 1:<\/strong> Statement of Objectives<\/h4>\r\nIdentify the life extension options available to the CHP transformer block to ensure safe and reliable operation until a scheduled extended plant shutdown in 12 years.\u00a0 Provide the asset owner a complete risk\/reward assessment of the proposed options.\r\n<h4><strong>Mapping Step 2:<\/strong> Data Collection and Documentation<\/h4>\r\nA complete history of the following data should be available and must include:\r\n<ul>\r\n \t<li>Dissolved Gas Analysis (DGA)- The collection of historical data on the types and changing levels of certain gases is a critical phase of the mapping process.<\/li>\r\n \t<li>These oil condition measures include oil acidity, Interfacial tension (IFT), Breakdown Voltage (BVD), furan content and inhibitor content.<\/li>\r\n \t<li>Data collection of maintenance and failures must also be collected.<\/li>\r\n<\/ul>\r\nA key objective of this stage of the mapping process is to begin to understand the interactions of the aging accelerators and their influence on the aging process as indicated in the diagram below:\r\n\r\n<img class=\"size-full wp-image-649 aligncenter\" src=\"https:\/\/polywaterv2.wpengine.com\/wp-content\/uploads\/2020\/09\/Exponential-Nature-of-Accelerated-Aging-12x8-72ppi.png\" alt=\"\" width=\"864\" height=\"550\" \/>\r\n<h4><strong>Mapping Step 3:<\/strong> Data Analysis<\/h4>\r\nThe DGA analysis at this stage provides the data from which transformer condition diagnostics and risks are identified.\r\nMeasuring oil\u2019s aging impact on power transformers indicates the acceleration of the aging rate and the actions needed for its amelioration.\r\nMaintenance history and data can show when and how mechanical anomalies occurred and record the mechanical design of replaced parts such as cooling systems and On Load Tap Changer (OLTC)\r\n\r\nThe table below shows the number and function of the 10 transformers in the CHP and their EOL assessment.\r\n\r\n<img class=\"alignnone size-full wp-image-651\" src=\"https:\/\/polywaterv2.wpengine.com\/wp-content\/uploads\/2020\/09\/CHP-10-Transformers-Table-2-72-ppi.jpg\" alt=\"\" width=\"843\" height=\"330\" \/>\r\n\r\nThe data gathered in Step 2 is used to develop an understanding of the potential areas of risk and the possible replacement, remediation and conservation strategies needed to extend the life of this CHP transformer block by another 10 years.\r\n\r\nEach transformer\u2019s aging condition was assessed based on a number of factors derived from continuous gas monitoring and indicator trends.\u00a0 \u00a0Remaining lifespan estimates for each transformer were made and each transformer was assigned to a Remaining Lifespan category as shown above.\u00a0 Other factors such as load capacity, RS and the possibility of advanced breakdown (PoAB) due to Type 2-3 risks were evaluated too.\r\n<h4><strong>Mapping Step 4:<\/strong> Risk Assessment<\/h4>\r\n<strong>Transformer GSU1<\/strong>- This Generator Step-Up transformer shows a slightly reduced substance ranking due to a number of factors.\u00a0 These include higher O<sub>2<\/sub> consumption and a high furan re-saturation rate which indicate some accelerated aging.\u00a0 Some indications of high heat in some zones suggest overloading of this transformer.\u00a0 Oil acidity was good.\u00a0 It was determined that GSU1 would need to operate with simultaneous gas conditioning to slow the O<sub>2<\/sub> aging process.\u00a0 <strong>Estimated Remaining Lifetime is four years.<\/strong>\r\n\r\n<strong>Transformer GSU2<\/strong>- This Generator Step Up unit is in slightly better condition than GSU1.\u00a0 While RS is in the same range, a leak in a diverter switch shows acetylene in the system accompanied by partial discharge.\u00a0 As is recommended for GSU1, GSU2 should be operated with the shared simultaneous gas conditioning unit.\u00a0 The <strong>Estimated Remaining Lifetime is greater than five years.<\/strong>\r\n\r\n<strong>Transformer GSUOLD1<\/strong>- This Generator Step Up (GSU) transformer is in precarious condition.\u00a0 It can be used as back-up only under controlled conditions.\u00a0 <strong>Estimated Remaining Lifetime is less than two years.<\/strong>\r\n\r\n<strong>Transformer GSUSPARE1- <\/strong>This transformer was acquired from a peak-load gas-fired power station. years ago.\u00a0 It is in excellent condition, despite its 15 years (was in operation for about 2 years).\u00a0 Available data are not reliable as gas samples were taken while the transformer was not operating. Inspection of its bushings show some capacitance deviations which creates fire risk.\u00a0 If re-testing confirms that the capacitive deviations remain and TAN\u03b4 testing shows voltage leakage, it is recommended that the bushings be replaced.\u00a0 <strong>Estimated Remaining Lifetime is over 10 years.<\/strong>\r\n\r\n<strong>Auxiliary Transformers AUX1-AUXB11- <\/strong>AUX 1 and 2 show some problems caused by defective tap selectors and leaky diverter switches causing high H<sub>2<\/sub> levels.\u00a0 AUX3, AUX4, AUX5 and AUXB11 showed inconsistent readings of decreased moisture with higher BDV. This could be due to lack of data reported on these units.\u00a0 <strong>Estimated Remaining Lifetimes for AUX1, AUX2 and AUX3 are approximately 5 years.\u00a0 Estimated Remaining Lifetimes for the remaining auxiliaries are over five years.<\/strong>\r\n<h4><strong>Mapping Step 5:<\/strong> Classification of the units based on priority-of-importance criteria<\/h4>\r\nThe key transformers in the CHP (table 2) are the GSUs, GSU1 and GSU2. The redundant older GSUOLD1 has the greatest probability of not reaching the extended 10-year operating limit.\u00a0 Permanent deployment of the existing conditioning units will reduce the Type 1 risk of premature failure of GSUOLD1 if needed for back, up but the risk cannot be eliminated completely.\u00a0 The redundancy and excellent functionality of GSUSPARE1 also reduces operational risk for the GSU cohort of transformers. The acquisition of new GSUs would almost guarantee reaching the 10-year extension but may introduce Type 2 and financial risks in resale or deployment at the closing of the CHP.\r\n\r\nThe auxiliary transformers are a riskier cohort but have less impact on the operation of the CHP.\u00a0 The redundancy in this cohort is sufficient to minimize most risks to the entire plant. Connection of AUX1 to an external power source will further reduce the risk of losing revenue because of a decrease in the generating capacity of the plant due to premature failure.\r\n<h4><strong>Mapping Step 6: <\/strong>Preventative and Conservation Measures<\/h4>\r\nThe scenarios defined below are intended to reveal the different risks that may arise when replacement, remediation and conservation measures are taken:\r\n\r\n<strong>Scenario 1<\/strong>- No procurement of new transformers and no access to reserve transformers for redundancy.\u00a0 Possibility of loss of third-party grid transformer near the CHP.\u00a0 This scenario is exposed to high Type 3 risk with an extensive or total breakdown of the plant due to the lack of back-up of the GSU transformers in the event of a third-party grid transformer failure.\u00a0 In addition, a failure of one of the GSUs would reduce revenue generation from power production by 50% as illustrated on the scenario 1 table. Heat generation revenues may also be lost.\r\n\r\n<strong>Scenario 2<\/strong>- Invest in three RS conservation and conditioning systems and replace old GSU1 with a newer reserve transformer.\u00a0 This scenario provides back-up for the GSUs and spares for start-up and station supply auxiliary transformers.\u00a0 Along with the procurement of more preservation and conditioning units for the existing auxiliary transformers, Type 1 risk from their accelerated aging can be reduced so that the required 10-year extension of operating lifetime can be achieved.\u00a0 The switch of older GSU1 with a newer reserve will reduce some Type 1 risk. \u00a0Acquire new back-up transformers for start-up and station supply for redundancy.\u00a0 This increases Type 2 risk which will decline over time.\u00a0 Also, the addition of a connection to an external grid transformer to allow supply from outside the block will reduce Type 3 risk in the case of a random risk event.\u00a0 This scenario is exposed to some Type 2 &amp; 3 risks.\r\n\r\n<strong>Scenario 3:\u00a0 <\/strong>Switch out GSU1 with a newly acquired GSU. Switch out GSU2 with GSUSPARE1. GSU2 can be used as a back-up. Acquire three back-up units for the auxiliary units.\u00a0 GSU1 and GSU2 can be a back-up GSU transformers for the new GSU and GSUSPARE1 which become the operating GSUs for the plant.\u00a0 Acquire three preservation and conditioning units to be rotated amongst the six operating auxiliary units. Replacing defective switches and bushings.\u00a0 This scenario is exposed to similar levels of Type 2 &amp; 3 risks. \u00a0In addition, there is some financial risk created in the event the GSU is not sold or recommissioned at the end of the ten-year extension.\r\n<h4><strong>Mapping Step 7:<\/strong> Scenario Cost Estimates and Risk Exposure<\/h4>\r\nThe costs and benefits for each option are summarized\r\n\r\n<img class=\"alignnone size-full wp-image-653\" src=\"https:\/\/polywaterv2.wpengine.com\/wp-content\/uploads\/2020\/09\/Cost-Benefit-chart-final.png\" alt=\"\" width=\"937\" height=\"1003\" \/>\r\n<h4><strong>Mapping Step 8: <\/strong>Long Term Preservation Plan<\/h4>\r\nBased on the economic analysis and associated risks of each of these scenarios, Scenario 1 can be rejected outright as the benefits are offset by the level of risk in the event any one of the key assets fails.\u00a0 It is estimated that loss of energy production from this plant could cost up to 200,000\u20ac per day.\u00a0 With a lead time of 18 months to receive a replacement transformer, this daily loss of revenue would continue to increase.\u00a0 As this is a CHP operation, heating revenues would also be lost during the winter months.\r\n\r\nIf Scenario 2 is selected as the long-term approach to extending the life of the CHP, both technical and economic risks will be low.\u00a0 The back-up units for the GSU and auxiliary transformer will minimize much of the risk in the event of a short-circuit of either a third-party grid transformer or an auxiliary start-up or supply unit.\u00a0 The conditioning and monitoring units will ensure RS is conserved to reduce the risk of accelerated aging in the older units.\r\n\r\nIf Scenario 3 is selected, Type 2 risks would increase but, the overall risk profile would be slightly higher than Scenario 2\u2019s profile.\u00a0\u00a0 Scenario 3 benefits come at a much higher investment in new equipment than Scenario 2. The higher investment also generates a financial risk if there is a significant delay in selling or recommissioning the new GSUs after the ten-year extension period.\r\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/how-oxygen-and-acids-influence-the-aging-of-transformers\/\" target=\"_blank\" rel=\"noopener\"><strong>Related Content: <\/strong>How Oxygen and Acids Influence the Aging of Transformers<\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2><strong>Summary\u00a0 <\/strong><\/h2>\r\nThis article has shown how the mapping process can be used to quantify technical, economic and financial risk of transformer populations. The causes of transformer failure, e.g. poor design\/workmanship, random external phenomena, and accelerated aging determine the level of uncertainty to which a transformer block is exposed.\u00a0 Based on the level of uncertainty and from where this uncertainty is greatest, appropriate remediation and preservation\/conservation measures can be developed to ensure both technical and economic objectives are met.\r\n<h2>Have any questions?<\/h2>\r\n<button class=\"button button--primary\" data-micromodal-trigger=\"polywater-modal--email-us-form\">Email Us <\/button>","post_title":"Mapping as Risk and Cost Assessment Methodology","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"mapping-as-risk-and-cost-assessment-methodology","to_ping":"","pinged":"","post_modified":"2025-05-19 16:06:35","post_modified_gmt":"2025-05-19 21:06:35","post_content_filtered":"","post_parent":0,"guid":"http:\/\/polywaterv2.wpengine.com\/?p=645","menu_order":150,"post_type":"post","post_mime_type":"","comment_count":"0","filter":"raw"}},{"post_identity":{"ID":31432,"post_author":"8","post_date":"2024-10-18 10:59:04","post_date_gmt":"2024-10-18 15:59:04","post_content":"","post_title":"Polywater\u00ae PowerPatch\u00ae Transformer Leak Repair System","post_excerpt":"Polywater\u00ae PowerPatch\u00ae Transformer Leak Repair System delivers fast in-field repairs that are reliable, durable, and provide long-term protection, often without equipment shutdown. The strong adhesive properties of PowerPatch bond to a variety of different materials and surface types making it an ideal choice for diverse repair scenarios such as small pinholes, cracks, or large areas, including leaks at bolts and gaskets. PowerPatch is well suited for several common transformer leak repairs including bushing repair, main gasket repair, conservator tank repair, and radiator fin repair. It also is used to repair PILC cables. It is non-conductive and doesn\u2019t affect the dielectric properties of insulating materials and retains strength after exposure to oil and SF6 gas. Keep operations up and running, reduce unplanned outages, and potential risks to the environment with Polywater PowerPatch Transformer Leak Repair System.","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"polywater-powerpatch-transformer-leak-repair-system","to_ping":"","pinged":"","post_modified":"2024-10-25 14:30:16","post_modified_gmt":"2024-10-25 19:30:16","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.polywater.com\/?post_type=video&#038;p=31432","menu_order":0,"post_type":"video","post_mime_type":"","comment_count":"0","filter":"raw"}}],"vidyard_override":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Polywater PowerPatch\u00ae Seals Beat Common Gasket Replacement Methods - Polywater<\/title>\n<meta name=\"description\" content=\"Stop oil leakage and save time\/money with PowerPatch Transformer Sealant. Learn how it beats traditional gasket replacement methods - read the success story.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Polywater PowerPatch\u00ae Seals Beat Common Gasket Replacement Methods - Polywater\" \/>\n<meta property=\"og:description\" content=\"Stop oil leakage and save time\/money with PowerPatch Transformer Sealant. Learn how it beats traditional gasket replacement methods - read the success story.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/\" \/>\n<meta property=\"og:site_name\" content=\"Polywater\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-25T08:48:18+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-application-advertorial-header-1024x438.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"438\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/solution-story\\\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\\\/\",\"url\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/solution-story\\\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\\\/\",\"name\":\"Polywater PowerPatch\u00ae Seals Beat Common Gasket Replacement Methods - Polywater\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/solution-story\\\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/solution-story\\\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.polywater.com\\\/wp-content\\\/uploads\\\/2023\\\/05\\\/PowerPatch-application-advertorial-header.png\",\"datePublished\":\"2023-05-10T19:33:54+00:00\",\"dateModified\":\"2025-06-25T08:48:18+00:00\",\"description\":\"Stop oil leakage and save time\\\/money with PowerPatch Transformer Sealant. Learn how it beats traditional gasket replacement methods - read the success story.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/solution-story\\\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.polywater.com\\\/en\\\/solution-story\\\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/solution-story\\\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.polywater.com\\\/wp-content\\\/uploads\\\/2023\\\/05\\\/PowerPatch-application-advertorial-header.png\",\"contentUrl\":\"https:\\\/\\\/www.polywater.com\\\/wp-content\\\/uploads\\\/2023\\\/05\\\/PowerPatch-application-advertorial-header.png\",\"width\":1920,\"height\":821,\"caption\":\"a gloved hand holds a cartridge of Polywater Powerpatch in a dispensing gun, and applies it to a row of bolts across an electrical transformer.\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/solution-story\\\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Polywater PowerPatch\u00ae Seals Beat Common Gasket Replacement Methods\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/\",\"name\":\"Polywater\",\"description\":\"Solutions at work.\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.polywater.com\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Polywater PowerPatch\u00ae Seals Beat Common Gasket Replacement Methods - Polywater","description":"Stop oil leakage and save time\/money with PowerPatch Transformer Sealant. Learn how it beats traditional gasket replacement methods - read the success story.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/","og_locale":"en_US","og_type":"article","og_title":"Polywater PowerPatch\u00ae Seals Beat Common Gasket Replacement Methods - Polywater","og_description":"Stop oil leakage and save time\/money with PowerPatch Transformer Sealant. Learn how it beats traditional gasket replacement methods - read the success story.","og_url":"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/","og_site_name":"Polywater","article_modified_time":"2025-06-25T08:48:18+00:00","og_image":[{"width":1024,"height":438,"url":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-application-advertorial-header-1024x438.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/","url":"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/","name":"Polywater PowerPatch\u00ae Seals Beat Common Gasket Replacement Methods - Polywater","isPartOf":{"@id":"https:\/\/www.polywater.com\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/#primaryimage"},"image":{"@id":"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/#primaryimage"},"thumbnailUrl":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-application-advertorial-header.png","datePublished":"2023-05-10T19:33:54+00:00","dateModified":"2025-06-25T08:48:18+00:00","description":"Stop oil leakage and save time\/money with PowerPatch Transformer Sealant. Learn how it beats traditional gasket replacement methods - read the success story.","breadcrumb":{"@id":"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/#primaryimage","url":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-application-advertorial-header.png","contentUrl":"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/PowerPatch-application-advertorial-header.png","width":1920,"height":821,"caption":"a gloved hand holds a cartridge of Polywater Powerpatch in a dispensing gun, and applies it to a row of bolts across an electrical transformer."},{"@type":"BreadcrumbList","@id":"https:\/\/www.polywater.com\/en\/solution-story\/polywater-powerpatch-seals-beat-common-gasket-replacement-methods\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.polywater.com\/en\/"},{"@type":"ListItem","position":2,"name":"Polywater PowerPatch\u00ae Seals Beat Common Gasket Replacement Methods"}]},{"@type":"WebSite","@id":"https:\/\/www.polywater.com\/en\/#website","url":"https:\/\/www.polywater.com\/en\/","name":"Polywater","description":"Solutions at work.","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.polywater.com\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"taxonomies":[{"term_id":2981,"name":"Electrical Infrastructure","slug":"electrical-infrastructure","term_group":0,"term_taxonomy_id":2981,"taxonomy":"industry-type","description":"","parent":0,"count":444,"filter":"raw","term_order":"0"},{"term_id":2990,"name":"Aging Transformers","slug":"aging-transformers","term_group":0,"term_taxonomy_id":2990,"taxonomy":"category","description":"","parent":2993,"count":11,"filter":"raw","term_order":"1"},{"term_id":3005,"name":"Case Study","slug":"case-study","term_group":0,"term_taxonomy_id":3005,"taxonomy":"category","description":"","parent":3004,"count":16,"filter":"raw","term_order":"1"},{"term_id":2993,"name":"Asset Life Extension","slug":"asset-life-extension","term_group":0,"term_taxonomy_id":2993,"taxonomy":"category","description":"","parent":0,"count":29,"filter":"raw","term_order":"2"},{"term_id":3018,"name":"Equipment Maintenance","slug":"equipment-maintenance","term_group":0,"term_taxonomy_id":3018,"taxonomy":"category","description":"","parent":2993,"count":7,"filter":"raw","term_order":"2"},{"term_id":2991,"name":"Damage to Field Assets","slug":"damage-to-field-assets","term_group":0,"term_taxonomy_id":2991,"taxonomy":"category","description":"","parent":2993,"count":16,"filter":"raw","term_order":"3"},{"term_id":3004,"name":"Content Type","slug":"content-type","term_group":0,"term_taxonomy_id":3004,"taxonomy":"category","description":"","parent":0,"count":86,"filter":"raw","term_order":"4"}],"featured_image":false,"short_summary":"","_links":{"self":[{"href":"https:\/\/www.polywater.com\/en\/wp-json\/wp\/v2\/solution-story\/21467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.polywater.com\/en\/wp-json\/wp\/v2\/solution-story"}],"about":[{"href":"https:\/\/www.polywater.com\/en\/wp-json\/wp\/v2\/types\/solution-story"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.polywater.com\/en\/wp-json\/wp\/v2\/media\/21470"}],"wp:attachment":[{"href":"https:\/\/www.polywater.com\/en\/wp-json\/wp\/v2\/media?parent=21467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.polywater.com\/en\/wp-json\/wp\/v2\/categories?post=21467"},{"taxonomy":"industry-type","embeddable":true,"href":"https:\/\/www.polywater.com\/en\/wp-json\/wp\/v2\/industry-type?post=21467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}