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Title: Unique Methods Of Mitigating Shear In Plastic Pipe
Author: David G. Wells
Source: American Gas Association 1974
Year Published: 1974
Abstract: It is a well known fact that plastic tubing is most vulnerable to a failure media known as shear and that shear is most likely to occur at the end of the insert stiffener protruding from a compression coupling. The most common compression fitting installed below ground is the tee used as a main connection to the service. This tee is invariably installed by digging an oversized bell hole and the earth settlement after backfill is the culprit which causes the shearing action. Consumers Power Company commenced installation of 5/8-inch and 1 1/8-inch polyethylene service lines in 1968. We were keenly aware of this potential shear problem and issued Standards and provided training on how to install a 3-inch diameter plastic shear protector over the nut of the tee with the other end supported by wood blocking. Sand or compactible material was then carefully hand tamped to cover the tubing.

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