ASTM WK21887

    Work Item: ASTM WK21887 - New Test Method for Evaluating the Oxidative Resistance of Polypropylene (PP) Piping and Systems to Hot Chlorinated Water

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    Developed by Subcommittee: F17.40 | Committee F17 | Contact Staff Manager



    1. Scope

    1.1 This test method describes the general requirements for evaluating the long-term, chlorinated water, oxidative resistance of polypropylene (PP) piping produced in accordance with Specification F 2389 used in hot-and-cold water distribution systems by exposure to hot, chlorinated water. This test method outlines the requirements of a pressurized flow-through test system, typical test pressures, test-fluid characteristics, failure type, and data analysis. NOTE 1-Other known disinfecting systems (chlorine dioxide, ozone, and chloramines) are also used for protection of potable water. Free chlorine is the most common disinfectant in use today. A PPI research project examined the relative aggressiveness of free chlorine and chloramines on PEX pipes, both at the same 4.0-ppm concentration and the same test temperatures. The results of the testing showed pipe failure times approximately 40 % longer when tested with chloramines compared to testing with free chlorine at the tested conditions. Based on these results, the data suggest that chloramines are less aggressive than free chlorine to PEX pipes. 1.3 This test method is applicable to PP piping and systems used for transport of potable water containing free chlorine for disinfecting purposes. The oxidizing potential of the test fluid specified in this test method exceeds that typically found in potable water systems across the United States. NOTE 2-This test method is technically equivalent to F 2023 when RO or DI water is used and prepared in accordance with 9.1.1 RO or DI Water Test-Fluid Preparation. 1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 The following precautionary caveat pertains only to the test method portion, Section 12, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    Used as a reference method in ASTM F 2389, replacing existing reference to F 2023, which is a method for PEX.


    Keywords

    chlorine; polypropylene; hot-and-cold water distribution

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:
    11-17-2008

    Technical Contact:
    James Paschal

    Status:
    Draft Under Development