www.thedriller.com/articles/87083-new-nsf-certification-for-geothermal-piping
New NSF Certification for Geothermal Piping
August 15, 2007
NSF International’s Plumbing Program recently introduced a new geothermal listing for piping products. NSF’s new geothermal listing service tests and certifies polyethylene (PE) and polypropylene (PP) piping system products that meet the following requirements:
- Final performance of the product – this includes testing to ASTM D3035 or AWWA C901 requirements for short-term burst, pressure testing and environmental stress crack resistance
- Physical properties of the material used in production – this testing includes density, flexural modulus, tensile strength, and a PENT of at least 192 hours as required by the Plastics Pipe Institute (PPI) Part Q
- Long-term hydrostatic stress test – includes evaluation of materials to the requirements of the PPI’s Technical Report 3 (PPI TR-3), as well as testing to European and Asian temperature and pressure requirements
- Health effects testing to ensure compliance with Section 4 of NSF/ANSI Standard 61: Drinking Water System Components -- Health Effects if products are to be used in potable water applications
