1、Designation:F202313Standard Test Method forEvaluating the Oxidative Resistance of CrosslinkedPolyethylene(PEX)Tubing and Systems to Hot ChlorinatedWater1This standard is issued under the fixed designation F2023;the number immediately following the designation indicates the year oforiginal adoption o
2、r,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method describes the general requirements forevaluating the long-term,chlo
3、rinated water,oxidative resis-tance of cross-linked polyethylene(PEX)tubing produced inaccordance with Specification F876 or PEX tubing/fittingsystems in accordance with Specification F877 used in hot-and-cold water distribution systems by exposure to hot,chlo-rinated water.This test method outlines
4、 the requirements of apressurized flow-through test system,typical test pressures,test-fluid characteristics,failure type,and data analysis.NOTE1Other known disinfecting systems(chlorine dioxide,ozone,and chloramines)are also used for protection of potable water.Free-chlorine is the most common disi
5、nfectant in use today.A PPI researchproject examined the relative aggressiveness of free chlorine and chloram-ines on PEX pipes,both at the same 4.0 ppm concentration and the sametest temperatures.The results of the testing showed pipe failure timesapproximately 40%longer when tested with chloramine
6、s compared totesting with free chlorine,at the tested conditions.Based on these results,the data suggests that chloramines are less aggressive than free chlorine toPEX pipes.1.2 Guidelines and requirements for test temperatures,testhoop stresses,and other test criteria have been established byprior
7、testing of PEX tubing produced by the three mostcommon commercial methods of cross-linking:silane,peroxide,and electron-beam(see Note 2).Other related systemcomponents that typically appear in a PEX hot-and-cold waterdistribution system can be evaluated with the PEX tubing.When testing PEX tubing an
8、d fittings as a system,it isrecommended that the anticipated end-use fitting type(s)andmaterial(s)be included in the test circuit since it is known thatsome fitting types and materials can impact failure times.Specimens used shall be representative of the piping product(s)and material(s)under invest
9、igation.NOTE2The procedures described in this test method(with somemodifications of test temperatures or stresses,or both)have been used toevaluate pipes manufactured from polybutylene(PB),polyethylene(PE),polypropylene(PP),multilayer(polymer-metal composite),copper,andstainless steel.1.3 This test
10、method is applicable to PEX tubing andsystems used for transport of potable water containing free-chlorine for disinfecting purposes.The oxidizing potential ofthe test-fluid specified in this test method exceeds that typicallyfound in potable water systems across the United States.1.4 The values sta
11、ted in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 The following precautionary caveat pertains only to thetest method portion,Section 12,of this specif
12、ication.Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Doc
13、uments2.1 ASTM Standards:2D1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsF412 Terminology Relating to Plastic Piping SystemsF876 Specification for Crosslinked Polyethylene(PEX)Tub-ingF877 Specification for C
14、rosslinked Polyethylene(PEX)Hot-and Cold-Water Distribution SystemsF948 Test Method for Time-to-Failure of Plastic PipingSystems and Components Under Constant Internal Pres-sure With Flow2.2 ISO Standards:ISO 9080 Thermoplastic Pipe for Transport of FluidsMethods of Extrapolation of Hydrostatic Stre
15、ss Rupture1This test method is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved Nov.1,2013.Published December 2013.Originallyapproved in 2000.Last previous edition approved in 2010 as
16、 F2023 10.DOI:10.1520/F2023-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Data to Determine the Long Term Strength of Thermo-plastic P