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AWWA C504 - AWWA Standard for Rubber-Seated Butterfly Valves. <br />AWWA C906 - AWWA Standard for Polyethylene Pressure Pipe and <br />3.4 <br />3.5 <br /> Fittings, 4 in. through 63 in. for Water Distribution. <br />AMERICAN WELDING SOCIETY (AWS- <br />AWS D10.9 - Specification and Qualification of Welding Procedures and <br /> Welders for Piping and Tubing. <br />PLASTIC PIPE I NSTITUTE <br />PPI TR-3 Policies and Procedures for Developing Recommended <br /> Hydrostatic Design Stresses for Thermoplastic Pipe <br /> Materials. <br />PPI TR-4 Recommended Hydrostatic Strengths and Design Stresses <br /> for Thermoplastic Pipe and Fittings Compounds. <br />PPI Handbook- PPI Handbook of Polyethylene Pipe - Underground <br /> Installation of Polyethylene Pipe. <br />PPI Handbook- PPI .Handbook of Polyethylene Pipe - Chapter 6: <br /> Polyethylene Joining Procedures. <br />PPI Handbook- PPI Handbook of Polyethylene Pipe -Inspections, Test, and <br /> Safety Considerations. <br />SPEC. C -PIPING <br />PAGE 3 <br />