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Title: Polyethylene Piping Backfill Material Studies At Washington Gas
Author: Karl m. Gunther
Source: American Gas Association 1993
Year Published: 1993
Abstract: Washington Gas started using plastic piping materials in the late 1950s and always specified that the plastic pipe must be bedded in sand. From the onset of the use of plastic pipe until 1976, sand bedding was used on plastic services and mains because it was thought that sand would provide the maximum in scratch and rock impingement protection. The added cost of sand bedding was accepted as a necessary cost of the installation of plastic pipe.

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