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WaterWorld Editorial Feature- Polyethylene Encasments

By Brandon C. Jones

Polyethylene encasements can be an economical and no maintenance corrosion protection system for ductile iron pipe. They are an engineered corrosion control system using specially designed material with specific requirements that are outlined in national and international standards. Most of these requirements are outlined in the ANSI/AWWA C105/A21.5 specification and include strength, tear resistance, impact resistance, and dielectric strength.

Protection of the pipe is achieved by simply encasing it with either a tube or sheet of loose polyethylene at the job site immediately before installation. Once installed, polyethylene acts as an un-bonded film that prevents direct contact of the pipe with corrosive soil.  more...

WaterWorld Product Focus- All New Joint Wrap

Many mechanical joints contain sharp objects that protrude from their surface. These sharp objects can puncture and tear through standard corrosion protection wraps including both 8 MIL Linear Low Density (LLDPE) and even 4 MIL Cross-Laminated High Density (CLHDPE) wraps. Punctures and tears in the wrap leave the joint vulnerable to soil contact and corrosion, shortening the life of one of the key elements in any piping system.

After talking with distributors at the 2007 American Water Works Association annual conference, staff at AA Thread Seal Tape, Inc. Seal Tape began developing a product that could meet their distributor's demands. What they came up with after a couple years of brain storming, developing and tweaking their design is a 10 MIL CLHDPE Joint Wrap that is resistant to almost any kind of puncture or tear that can occur during installation more.....