The Plastics Pipe Institute Inc. (PPI) has released a new model specification document that provides guidance to specifiers, engineers, designers, and others about selecting, specifying, and installing plastic piping materials for ground source geothermal systems. Prepared by PPI's Building & Construction Division, PPI MS- 7 Model Specification for Plastic Piping Materials for Ground Source Geothermal Applications applies to plastic piping materials for open- and closed-loop, horizontal and vertical, direct-buried, and submerged water-based ground-source geothermal heat exchange systems. PPI MS-7 includes detailed specifications for four plastic piping materials which have been proven in ground source heat exchange systems: HDPE, PE-RT, PEX, and PP (PP-R and PP-RCT).
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