ASTM F2023-2008 Standard Test Method for Evaluating the Oxidative Resistance of Crosslinked Polyethylene (PEX) Tubing and Systems to Hot Chlorinated Water.pdf
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1、Designation: F 2023 08An American National StandardStandard Test Method forEvaluating the Oxidative Resistance of CrosslinkedPolyethylene (PEX) Tubing and Systems to Hot ChlorinatedWater1This standard is issued under the fixed designation F 2023; the number immediately following the designation indi
2、cates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method describes the general re
3、quirements forevaluating the long-term, chlorinated water, oxidative resis-tance of cross-linked polyethylene (PEX) tubing produced inaccordance with Specification F 876 or PEX tubing/fittingsystems in accordance with Specification F 877 used in hot-and-cold water distribution systems by exposure to
4、 hot, chlo-rinated water. This test method outlines the requirements of apressurized flow-through test system, typical test pressures,test-fluid characteristics, failure type, and data analysis.NOTE 1Other known disinfecting systems (chlorine dioxide, ozone,and chloramines) are also used for protect
5、ion of potable water. Free-chlorine is the most common disinfectant in use today. A PPI researchproject examined the relative aggressiveness of free chlorine and chloram-ines on PEX pipes, both a the same 4.0 ppm concentration and the sametest temperatures. The results of the testing showed pipe fai
6、lure timesapproximately 40% longer when tested with chloramines 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, testhoo
7、p stresses, and other test criteria have been established byprior testing of PEX tubing produced by the three mostcommon commercial methods of cross-linking: silane, perox-ide, and electron-beam (see Note 2). Other related systemcomponents that typically appear in a PEX hot-and-cold waterdistributio
8、n system can be evaluated with the PEX tubing.When testing PEX tubing and 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
9、shall be representative of the piping product(s)and material(s) under investigation.NOTE 2The 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),polypropyle
10、ne (PP), multilayer (polymer-metal composite), copper, andstainless steel.1.3 This test 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
11、 that typicallyfound in potable water systems across the United States.1.4 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation purposes.1.5 The following precautionary caveat pertains only to thetest method portion, Section 12,
12、of this specification. 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
13、.2. Referenced Documents2.1 ASTM Standards:2D 1600 Terminology for Abbreviated Terms Relating toPlasticsD 2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsF 412 Terminology Relating to Plastic Piping SystemsF 876 Specification for Crosslinked Polyethylene (PEX)TubingF 8
14、77 Specification for Crosslinked Polyethylene (PEX)Plastic Hot- and Cold-Water Distribution SystemsF 948 Test Method for Time-to-Failure of Plastic PipingSystems and Components Under Constant Internal Pres-sure With Flow2.2 ISO Standards:1This test method is under the jurisdiction of ASTM Committee
15、F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved March 1, 2008. Published April 2008. Originallyapproved in 2000. Last previous edition approved in 2005 as F 2023 05.2For referenced ASTM standards, visit the ASTM website, ww
16、w.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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ISO
17、9080 Thermoplastic Pipe for Transport of FluidsMethods of Extrapolation of Hydrostatic Stress RuptureData to Determine the Long Term Strength of Thermo-plastic Pipe3ISO 13760 Plastic Pipe for the Conveyance of Fluids UnderPressureMiners RuleCalculation Method for Cumu-lative Damage32.3 Plastics Pipe
18、 Institute (PPI) Document:TN-16 Rate Process Method for Projecting Performance ofPolyethylene Piping Components42.4 American Water Works Association (AWWA) Docu-ment:1996 WATER:STATS Survey53. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F 412 and abbreviations are in ac
19、cordance with Termi-nology D 1600, unless otherwise indicated.3.1.1 brittle failure (Stage II), nfailure in the tubing wallthat is characterized by little or no material deformation in thefailure area and is the result of a single crack emanating fromthe interior of the tubing to the outside surface
20、 typicallyresulting in a pinhole leak, see Fig. 1. Brittle failures producedwith this test method shall not be used for data analysis.3.1.2 ductile failure (Stage I), nfailure in the tubing wallthat is characterized by obvious localized deformation of thematerial visible with the unaided eye, see Fi
21、g. 1. Ductilefailures produced with this test method shall not be used fordata analysis.3.1.3 environmental or oxidative failure (Stage III),nfailure in the tubing wall characterized by a large numberof cracks emanating from the interior surface of the tubingwall, see Fig. 1.3.1.3.1 DiscussionStage
22、III failures may also be identifiedby a color shift in the failure area (typically brown orreddish-brown). Identification of oxidative failure, when notobvious by inspection with the unaided eye, can be performedwith a 253 microscope or other similar device yielding thesame level of magnification. O
23、nly Stage III environmentalfailures shall be used for data analysis.3.1.4 hot-and-cold water distribution system, na combi-nation of components such as tubing, fittings, valves, and soforth, that when installed as a complete system, make up theinterior water supply system of a commercial or resident
24、ialstructure.3.1.5 long-term oxidative resistance, nthe extrapolatedtime-to-failure prediction as determined by analysis of time-to-failure test data by multiple linear regression utilizing therate process method of PPI TN-16 or Model Q of ISO 9080.Where applicable, application of Miners Rule in acc
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