The fifth edition of the American Water Works Association’s (AWWA) newly updated C906-21 standard clarifies the proper use and description of PE4710 high-density polyethylene (HDPE) pressure pipe and fittings. Photo courtesy of Plastic Pipe Institute Inc.,
The Fifth Edition of the updated American Water Works Association (AWWA) standard C906-21 clarifies the proper use and description of PE4710 high-density polyethylene (HDPE) pressure pipe and fittings.
Some changes to the standard include rewriting the oxidation resistance section (Section II.C) and updating the definitions of design factor, hydrostatic design basis (HDB), standard aspect ratio (SDR), and pure PE blend. Added definitions for PE4710, PE Blend, Potable Water, Treated Water, Safety Factor (greater than two), Sample, Sample and Wastewater in Clause Three. To ensure the pipe meets the appropriate ductility and tensile strength requirements, C906-21 has been updated to clarify the alternative tests to be performed.
The revisions to ANSI/AWWA C906 are another step forward in the use of HDPE piping systems in the water industry, according to Camille George Rubeiz, Co-Chair of the Municipal HDPE Advisory Board and Senior Director of Engineering, Municipal and Industrial Division of Plastics Pipe Institute (PPI).
“The goal of C906 has always been to provide the gold standard that standardizes the use and manufacture of high-performance HDPE (PE4710) pressure pipe and fittings from 102 to 1651 mm (4 to 65 inches) for waterworks with pressure classes (PCs) in the Range from 70 t/m2 (100 lbs/in2) to 235 t/m2 (335 lbs/in2) operating in temperatures up to 27°C (80°F),” said Rubeiz.
According to C906-21, “HDPE pipes and fittings are primarily intended for the transport of drinking water, waste water and treated water in underground (open and trenchless), marine or above-ground installations. For PE4710, the PC calculations include a safety factor (SF) greater than two in relation to the allowable service load and the SF for occasional shock pressure is greater than two.”
The new standard will come into effect on November 1st.
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