Stress and Chlorine Scores Revised

Latest revisions led by the Plastics Pipe Institute, Inc. (PPI) Constructing & Building Division resulted in enhancements to the newest version of the ASTM Normal, F2389 Normal Specification for Stress-Rated Polypropylene (PP) Piping Methods, which establishes necessities for polypropylene (PP-R and PP-RCT) piping system elements together with pipe, fittings, valves, and manifolds. The usual applies to hydronic heating and cooling, chilled water, water service strains, hot-and-cold water distribution, irrigation techniques, and different associated fluid transport functions.

PP-R and PP-RCT pipes and fittings mentioned within the lately up to date ASTM Normal F2389-24a can be found in diameters from 16 mm to 710 mm, also referred to as nominal diameters 3/8 to twenty-eight inches. Picture courtesy of PPI.

Initially issued in 2004, revisions to the newest version of the usual revealed in July 2024, F2389-24a, embody:

• Stress-temperature scores used for PP stress pipe techniques are clarified and harmonized by including new definitions for “design stress” and “design coefficient” after which making use of necessities for these components in a brand new Part 5.6.1.
• Oxidative stability (i.e., chlorine resistance) classifications are revised from CL-TD and CL-R to Courses 0, 1, 3, and 5 for consistency with different stress pipe requirements (e.g., ASTM F876).
• Marking necessities are additionally revised.

In line with Lance MacNevin, P. Eng., director of engineering for PPI’s Constructing & Building Division, “Because of these current revisions, stress scores shall be extra constant all through the business and classifications for resistance to scorching chlorinated water shall be according to different piping supplies.”

MacNevin continued, “Polypropylene (PP) is a flexible piping materials that’s utilized in a variety of functions. Two forms of PP are used for stress piping techniques: PP-R (polypropylene random copolymer) and PP-RCT (polypropylene random copolymer with modified crystallinity and temperature resistance). With their excessive temperature and stress capabilities, PP-R and PP-RCT pipes are appropriate for demanding stress piping functions, equivalent to plumbing, hydronics, and chilled water in business high-rise buildings or information facilities.”

PPI is the non-profit North American commerce affiliation representing the plastic pipe business, together with a number of producers of PP pipes and becoming techniques. PPI shaped the Polypropylene Stress Pipe Steering Committee in 2018 to collaborate on business requirements equivalent to F2389, coordinate analysis packages, develop technical publications, and create academic details about these techniques. The current revisions to F2389 are the newest results of cooperation between PPI member companies, meant to assist to develop this market in a technically appropriate and accountable method.

The revised customary is accessible straight from ASTM at: www.astm.org/f2389-24a.html.

Extra data and information concerning the use and set up of PP is accessible from the PPI Constructing & Building Division at www.plasticpipe.org/buildingconstruction.