Plastic Pipes Conference Association # 2023 Lake Buena Vista
Amster Howard
This paper focuses on the confusing plethora of choices that a design engineer in the United States faces when selecting installation instructions for buried pressure thermoplastic pipelines. For polyethylene pipe, the decision is between AWWA Manual M55, ASTM D2774, ASTM F1668, the PPI Handbook, MAB-3, PE Field Manual, manufacturer instructions, or their historical organizational specifications. Information on use of uncompacted bedding, an uncompacted padding over the pipe, use of composite stiffness, maximum particle size in embedment and backfill soil, terminology, soil classification, trench width, flowable fill, and use of a basic installation varies. Their historical organizational specifications are often out of date and need to reflect updated advancements. Use of ASTM standards that have been out of date for over 25 years sometimes appear in specifications.
The same issues also apply to PE non-pressure pipe, fiberglass pressure and non-pressure pipe, and PVC pressure and non-pressure pipe.
A move to unify the standards and manuals started with adopting the Uniform Soil Classes. Previously, pea gravel had 13 different names in the various documents. Now, many of the manuals and standards use a single description of Class II for pea gravel based on the Uniform Soil Classes.
Changes are currently being considered for many of the installation documents. However, revisions taking years to adopt, changes not being coordinated, and reluctance to revisions create a problem. Confusion can lead to poor installation practices. We need to help the design engineers, not put barriers in their way.
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