This document is the TN 1.05_C HDPE Pipe Joints and Gaskets. Introduction, pipe products, gaskets and materials explained with figure.

ADS offers a full line of corrugated pipe products to fit the requirements of nearly any storm drain or gravity flow project and some sanitary sewer and low head pressure project specifications. With several products available to meet many project needs, the following outlines the product characteristics and typical uses of pipe used for storm drainage, sanitary sewer and irrigation to aid in the most efficient selection of an ADS product; specifications with additional information for each pipe product are also available. In some applications when corrosive effluent may be present in the pipe, the gasket material should also be evaluated and will be discussed.

Two base materials are currently used for ADS products: high density polyethylene (HDPE) and polypropylene (PP). The HDPE products will be black in color, while the PP products will be grey in color. Products used for mainline storm drainage and sanitary sewer will have a dual wall or triple wall profile. Figure 1 illustrates a cross section of the dual and triple wall profiles.

All ADS gaskets meet the requirements of ASTM F477, “Standard Specification for Elastomeric Seals (Gaskets) for Joining Plastic Pipe.” There are two categories of gasket connections required to join ADS products: integral connections and field/fitting connections. Integral connections utilize the manufactured integral bell and spigot (IB). Field couplers or fitting connections use a welded bell that is identifiably larger than the IB joint on unmodified pipe. To allow for easy field modification, a larger valley or saddle gasket must be used when inserting the pipe or fitting into a welded bell. Gaskets are available for soil-tight or watertight performance.

Chemical resistance of gaskets is described with alternative pipe gasket material such as oil resistant gaskets and EPDM (Ethylene-Propylene gaskets.