Plastic Pipes Conference Association # 2021 Amsterdam
John M. Kurdziel
The use of recycled plastics in high density corrugated polyethylene pipe for storm sewers, highway culverts and general land drainage applications has now been widely accepted by municipalities and transportation agencies. This acceptance has made it possible to convert what was once considered a single use plastic product to a long-term infrastructure sustainable application. Possibly the last practical utilization of recycled plastics in infrastructure is their use in sanitary sewers. These installations have substantially higher requirements due to their depth of fill, higher effluent temperatures and the chemical content of the effluent. The balance between structural engineering design and long-term stress crack resistance creates a unique problem that must be carefully evaluated. This paper discusses these conflicting considerations and provides the means of adequately addressing them. It also discusses the ultimate limitations of recycled plastics as the internal pressures increase resulting in design conditions that negate their use. For although a short-term surge pressure can be accommodated with appropriate design requirements, a sustained pressure may ultimately result in a facility failing. This condition would be especially acute for any low head or pressure pipe applications.
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