1、Designation:F2968/F2968M14aStandard Specification forBlack Crosslinked Polyethylene(PEX)Pipe,Fittings andJoints For Gas Distribution Applications1This standard is issued under the fixed designation F2968/F2968M;the number immediately following the designation indicates the yearof original adoption o
2、r,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers outside diameter controlled,black metric-sized and IPS-si
3、zed crosslinked polyethylene(PEX)pipe,fittings and joints,made in pipe dimension ratiosranging from 6 to 17,and pressure rated for gas distribution.Included are requirements and test methods for material,workmanship,dimensions,burst pressure,hydrostatic sus-tained pressure,stabilizer functionality,b
4、ent-pipe hydrostaticpressure,degree of crosslinking,chemical resistance,andsqueeze-off.Requirements for pipe and fittings markings arealso given.The pipe,fittings and joints covered by thisspecification are intended for buried gas distribution and gastransmission pressure piping applications.1.2 The
5、 text of this specification references notes,footnotes,and appendixes,which provide explanatory material.Thesenotes and footnotes(excluding those in tables and figures)shallnot be considered as requirements of the specification.1.3 UnitsThe values stated in either SI units or inch-pound units are to
6、 be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.NOTE1Metric sized(SI units)pipe should only be joined
7、withcorresponding metric sized fittings,and inch sized pipe should only bejoined with corresponding inch sized fittings.Inch sized fittings should notbe used for metric sized pipe,and metric sized fittings should not be usedfor inch sized pipe.1.4 This standard does not purport to address all of the
8、safety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D543 Practices for Evaluating th
9、e Resistance of Plastics toChemical ReagentsD618 Practice for Conditioning Plastics for TestingD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD1598 Test Method for Time-to-Fail
10、ure of Plastic PipeUnder Constant Internal PressureD1599 Test Method for Resistance to Short-Time HydraulicPressure of Plastic Pipe,Tubing,and FittingsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD1603 Test Method for Carbon Black Content in OlefinPlasticsD2122 Test Method for Determi
11、ning Dimensions of Ther-moplastic Pipe and FittingsD2290 Test Method for Apparent Hoop Tensile Strength ofPlastic or Reinforced Plastic PipeD2765 Test Methods for Determination of Gel Content andSwell Ratio of Crosslinked Ethylene PlasticsD2837 Test Method for Obtaining Hydrostatic Design Basisfor T
12、hermoplastic Pipe Materials or Pressure Design Basisfor Thermoplastic Pipe ProductsD4218 Test Method for Determination of Carbon BlackContent in Polyethylene Compounds By the Muffle-Furnace TechniqueF412 Terminology Relating to Plastic Piping SystemsF876 Specification for Crosslinked Polyethylene(PE
13、X)Tub-ingF1041 Guide for Squeeze-Off of Polyolefin Gas PressurePipe and TubingF1055 Specification for Electrofusion Type PolyethyleneFittings for Outside Diameter Controlled Polyethyleneand Crosslinked Polyethylene(PEX)Pipe and Tubing1This specification is under the jurisdiction of ASTM Committee F1
14、7 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.Current edition approved Nov.1,2014.Published December 2014.Originallyapproved in 2014.Last previous edition approved in 2014 as D2968/D2968M14.DOI:10.1520/F296814A.2For referenced ASTM standards,visit the ASTM
15、 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 D
16、rive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 F1563 Specification for Tools to Squeeze-off Polyethylene(PE)Gas Pipe or TubingF1948 Specification for Metallic Mechanical Fittings forUse on Outside Diameter Controlled Thermoplastic GasDistribution Pipe and TubingF2897 Specification for Tracking and Traceability EncodingSystem of Natural Gas Distribution Components(Pipe,Tubing,Fittings,Valves,and Appurtenances)2.2 Federal Standard:3FED-STD-123 Marking for Shipment(Civil Agencies)2