Joining HDPE and PVC Duct

– Polywater® Bonduit® Offers Alternative to Mechanical Couplings –

An electric utility faced a common problem during an underground electrical system upgrade.  The upgrade required the joining of dissimilar conduits.  Specifically, HDPE, PVC, and steel duct needed to be securely connected to one another.  The joints needed to be strong, durable, and water-tight.

field shot of Bonduit joints around transformer

Bonduit® Joints in Conduits Leading to a Transformer

PVC pipe cement is suitable for PVC to PVC joints in all PVC conduit systems.  PVC can be joined to metal using a threaded PVC connector.  The real problem is the HDPE duct.  HDPE is common and cost effective conduit often used in directional boring. But PVC cement will not stick to HDPE at all.

Mechanical coupling are available to compress or thread PVC to HDPE.  But the strength and water tightness of the joint can be inconsistent.  Multiple sized couplings must be inventoried for a typical under-ground system.

Polywater® Bonduit® Conduit Adhesive solved this utility’s conduit joining problem.  The Bonduit® two-part adhesive system creates an air-tight and water-tight splice. The Bonduit® Adhesive uses a standard PVC coupling to make the connection. It can be used on all size conduits with only a change in coupling size.  A threaded PVC coupling can be used on medal conduit.  The HDPE is inserted and glued once the coupling has been threaded on the metal.

Bondut®Conduit Adhesive solves conduit connection problems.  It is generally less expensive than mechanical couplings.  Bonduit® offers flexibility joining conduits of different sizes.

The product link below presents more details on the advantages of Bonduit® Conduit Adhesive.

Link to Bonduit® Conduit Adhesive

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