1、Designation: F1281 11F1281 17 An American National StandardStandard Specification forCrosslinked Polyethylene/Aluminum/CrosslinkedPolyethylene (PEX-AL-PEX) Pressure Pipe1This standard is issued under the fixed designation F1281; the number immediately following the designation indicates the year ofo
2、riginal adoption or, 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 specification covers a coextruded crosslinked polyethy
3、lene composite pressure pipe with a welded aluminum tubereinforcement between the inner and outer layers. The inner and outer crosslinked polyethylene layers are bonded to the aluminumtube by a melt adhesive. Included is a system of nomenclature for the crosslinked polyethylene-aluminum-crosslinked
4、polyethylene(PEX-AL-PEX) pipes, the requirements and test methods for materials, the dimensions of the component layers and finished pipe,adhesion tests, and the burst and sustained pressure performance. Also given are the requirements and methods of marking. Thepipe covered by this specification is
5、 intended for use in potable water distribution systems for residential and commercialapplications, water service, underground irrigation systems, and radient panel heating systems, baseboard, snow- and ice-meltsystems, and gases that are compatible with the composite pipe and fittings.1.2 This spec
6、ification covers only composite pipes incorporating a welded aluminum tube. Pipes consisting of metallic layersnot welded together are outside the scope of this specification.1.3 Specifications for connectors for use with pipe meeting the requirements of this specification are given in Annex A1.1.4
7、This specification excludes polyethylene-aluminum-polyethylene pipes (see Specification F1282).1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.6 The following precautionary caveat pertains only to the test methods porti
8、on, Section 9, of this specification: This standarddoes not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety safety, health and healthenvironmental practices and determine the applicab
9、ility ofregulatory limitations prior to use.1.7 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World
10、 Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1598 Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal PressureD1599 Test Method f
11、or Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and FittingsD1600 Terminology for Abbreviated Terms Relating to PlasticsD1898 Practice for Sampling of Plastics (Withdrawn 1998)3D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and FittingsD2765 Test Methods f
12、or Determination of Gel Content and Swell Ratio of Crosslinked Ethylene PlasticsD3350 Specification for Polyethylene Plastics Pipe and Fittings MaterialsE8 Test Methods for Tension Testing of Metallic MaterialsF412 Terminology Relating to Plastic Piping Systems1 This specification is under the juris
13、diction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.11 on Composite.Current edition approved Sept. 15, 2011Aug. 1, 2017. Published September 2011August 2017. Originally approved in 1990. Last previous edition approved in 20072011as F1281 07.F1
14、281 11. DOI: 10.1520/F1281-11.10.1520/F1281-17.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last app
15、roved version of this historical standard is referenced on www.astm.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately dep
16、ict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM Internatio
17、nal, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1F1282 Specification for Polyethylene/Aluminum/Polyethylene (PE-AL-PE) Composite Pressure PipeF1974 Specification for Metal Insert Fittings for Polyethylene/Aluminum/Polyethylene and Crosslinked Polyethylene/Alum
18、inum/Crosslinked Polyethylene Composite Pressure Pipe2.2 National Sanitation Foundation Standard:Standard No. 61 Drinking Water System ComponentsHealth Effects4Standard No. 14 Plastics Piping System Components and Related Materials42.3 Federal Standard:Fed. Std. No. 123 Marking for Shipments (Civil
19、Agencies)52.4 Military Standard:MIL-STD-129 Marking for Shipment and Storage52.5 Uniform Classification Committee Standard:Uniform Freight Classification62.6 National Motor Freight Traffc Association Standard:National Motor Freight Classification73. Terminology3.1 DefinitionsDefinitions are in accor
20、dance with Terminology F412, and abbreviations are in accordance with TerminologyD1600, unless otherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 assemblythe joint between a fitting and a length of pipe.3.2.2 PEX-AL-PEX pipecomposite pipe produced by coextrusion or extrusio
21、n of layers of polyethylene/aluminum/polyethylene bonded together with a melt adhesive and crosslinked by irradiation or chemical means in combination heat andmoisture.3.2.3 pipe hoop stressfor simplicity the value of the hoop stress quoted assumes a homogeneous wall. Local values of stresswill vary
22、 with the different layers (see 3.2.3.1).3.2.3.1 DiscussionThick walled plastic pipes produced from one material have hoop stresses that vary through the wall, and are usually describedby the Lame Theory. The composite nature of the PEX-AL-PEX pipe, composed of materials with very differentYoungs Mo
23、dulusvalues, will, on pressurization, not have a uniform stress distribution through the thickness of the wall of the pipe. ThePEX-AL-PEX pipes have a hoop stress distribution that differs substantially from both the thick and thin walled pipe cases.4. Pipe Classification4.1 Pipe DiameterThe PEX-AL-
24、PEX pipes are classified by the outside diameter.4.2 Pipe Dimension RatioThe concept of dimension ratio is not relevant to PEX-AL-PEX composite pipes, and cannot beused to relate pressure rating with total wall thickness.5. Materials5.1 GeneralThe PEX-AL-PEX pipe is composed of one metallic layer, t
25、wo layers of polymeric adhesive, and two layers ofcrosslinked polyethylene. For pipe made to this specification the constituent materials must meet the following requirements:5.2 AluminumThe aluminum shall have a thickness as specified in Table 1. The material shall have minimum elongations andultim
26、ate tensile strengths of 20 % and 100 MPa (14 600 psi), respectively. The tests shall be conducted according to Test MethodsE8.5.3 Crosslinked Polyethylene:5.3.1 The polyethylene shall be, in the final finished state in the pipe, crosslinked as defined in Terminology D883.5.3.2 Polyethylene plastics
27、 used to make pipe meeting the requirements of this specification shall be virgin resin meeting therequirements of either Grade PE20A, B, or C; Grade PE23A, B, or C; Grade PE30A, B, or C; or Grade PE33A, B, or C inaccordance with Specification D3350.4 Available from NSF International, P.O. Box 13014
28、0, 789 N. Dixboro Rd., Ann Arbor, MI 48113-0140, http:/www.nsf.org.5 Available from Standardization Documents Order Desk, Bldg. 4 Section D, DLA Document Services, Building 4/D, 700 Robbins Ave., Philadelphia, PA 19111-5098,Attn: NPODS.19111-5094, http:/quicksearch.dla.mil.6 Available from the Unifo
29、rm Classification Committee, Suite 1106, 222 South Riverside Plaza, Chicago, IL 60606.7 Available from the National Motor Freight Traffic Association, Inc., National Motor Freight Classification, American Tracking Associations, Inc., Traffic Dept., 1616 PSt., NW, Washington, DC 20036.F1281 1725.3.3
30、Class B compounds shall have sufficient ultraviolet (UV) stabilizers to protect the pipe from deleterious effects due tocontinuous outdoor exposure during storage and shipping. Pipe produced from Class B compounds are not suitable for exposedoutdoor application. Class A, B, and C compounds shall hav
31、e sufficient antioxidants to meet the requirements in SpecificationD3350.5.4 Melt AdhesiveThe material shall have a density cell of 1, 2, or 3; a melt index cell of 1, 2, or 3; and a color code of Aor B, in accordance with Specification D3350.5.5 Rework MaterialThe use of reclaimed, recycled, or rew
32、ork plastics is not permitted.6. Requirements6.1 GeneralThe requirements and test methods in this specification cover PEX-AL-PEX pipes. Tests on the individual layersthat comprise this composite pipe are outside the scope of this specification. The raw materials used, however, must conform tothe req
33、uirements as set out in Section 5.6.2 Dimensions and Tolerances of Pipe:6.2.1 Pipe DiameterThe minimum outside diameter and tolerances of the pipe shall meet the requirements given in Table 1,when measured in accordance with 9.1 and 9.1.2. Maximum and minimum (out-of-roundness) tolerances apply only
34、 tomeasurements made on pipe prior to coiling.6.2.2 Pipe Wall ThicknessThe total pipe wall thickness shall meet the requirements given in Table 2, when measured inaccordance with 9.1 and 9.1.3. The minimum wall thickness at any point of measurement of the pipe shall not be less than the valuespecifi
35、ed in Table 2.6.2.3 Inner and Outer Crosslinked Polyethylene Layer ThicknessThicknessesThe thicknessthicknesses of the inner andouter layerlayers of crosslinked polyethylene in the PEX-AL-PEX pipe shall have a minimum valuevalues and tolerance asspecified in Table 2, except for the polyethylene mate
36、rial in the outer PEX layer overlaying the weld, which shall have a minimumthickness of half thatthose specified in Table 2. The polyethylene thicknessthicknesses shall be measured in accordance with 9.2.6.2.4 Pipe LengthThe pipe shall be supplied coiled or in straight lengths as agreed upon with th
37、e purchaser and with anallowable tolerance of 0 mm (0 in.).6.3 Adhesion Test:6.3.1 For Sizes 0912 (38) to 2532 (1) there shall be no delamination of the PEX and AL, either on the bore side or the outside(see Fig. 1). The test shall be conducted in accordance with 9.3.1.6.3.2 The adhesion test of the
38、 PEX-layer to the aluminum for Sizes 3240 (114) to 6075 (212) is carried out by a separation test.The minimum adhesive force is specified in Table 3. The adhesive force shall not fall below these levels. The test shall beconducted in accordance with 9.3.2.TABLE 1 Outside Diameters, Aluminum Thicknes
39、s, and Tolerances for PEX-AL-PEXNominalPipe Size,mm(in.)MinimumOutsideDiameter, mm(in.)Tolerance on Minimum,mm (in.)Maximum Out-of-Roundness,A mm (in.)Minimum AluminumThickness, mm (in.)Tolerance on Thickness,mm (in.)0912 (38) 12.00 (0.472) +0.30 (0.012) 0.3 (0.012) 0.18 (0.007) +0.09 (+0.0035)1216
40、12) 16.00 (0.630) +0.30 (0.012) 0.4 (0.016) 0.18 (0.007) +0.15 (+0.006)1620 (58) 20.00 (0.787) +0.30 (0.012) 0.5 (0.020) 0.23 (0.009) +0.23 (+0.009)2025 (34) 25.00 (0.984) +0.30 (0.012) 0.5 (0.020) 0.23 (0.009) +0.09 (+0.0035)2026 (78) 26.00 (1.022) +0.30 (0.012) 0.5 (0.020) 0.53 (0.021) +0.10 (+0.
41、004)2532 (1) 32.00 (1.260) +0.30 (0.012) 0.5 (0.020) 0.28 (0.011) +0.09 (+0.0035)3240 (114) 39.95 (1.573) +0.30 (0.012) 0.5 (0.020) 0.33 (0.013) .4150 (112) 49.90 (1.964) +0.30 (0.012) 0.5 (0.020) 0.47 (0.018) .5163 (2) 62.90 (2.484) +0.40 (0.016) 0.5 (0.020) 0.57 (0.022) .6075 (212) 75.10 (2.957) +
42、0.60 (0.024) 1.0 (0.039) 0.67 (0.026) .TABLE 1 Outside Diameters, Aluminum Thickness, and Tolerances for PEX-AL-PEXDiameterNominal(DN)NominalPipe Size(NPS)Minimum OutsideDiameter, mm (in.)Tolerance on Minimum,mm (in.)Maximum Out-of-Roundness,A mm (in.)Minimum AluminumThickness, mm (in.)Tolerance on
43、Thickness,mm (in.)12 38 12.00 (0.472) +0.30 (0.012) 0.3 (0.012) 0.18 (0.007) +0.09 (+0.0035)16 14 16.00 (0.630) +0.30 (0.012) 0.4 (0.016) 0.18 (0.007) +0.15 (+0.006)20 58 20.00 (0.787) +0.30 (0.012) 0.5 (0.020) 0.23 (0.009) +0.23 (+0.009)25 34 25.00 (0.984) +0.30 (0.012) 0.5 (0.020) 0.23 (0.009) +0.
44、09 (+0.0035)26 78 26.00 (1.022) +0.30 (0.012) 0.5 (0.020) 0.53 (0.021) +0.10 (+0.004)32 1 32.00 (1.260) +0.30 (0.012) 0.5 (0.020) 0.28 (0.011) +0.09 (+0.0035)40 114 39.95 (1.573) +0.30 (0.012) 0.5 (0.020) 0.33 (0.013) .50 112 49.90 (1.964) +0.30 (0.012) 0.5 (0.020) 0.47 (0.018) .63 2 62.90 (2.484) +
45、0.40 (0.016) 0.5 (0.020) 0.57 (0.022) .75 214 75.10 (2.957) +0.60 (0.024) 1.0 (0.039) 0.67 (0.026) .A The out-of-roundness specification applies only to tubing prior to coiling.F1281 1736.4 Apparent Tensile Strength of PipeThe pipe rings, when tested in accordance with 9.4, shall meet the minimum st
46、rengthspecifications defined in Table 4.TABLE 2 Wall Thickness for PEX-AL-PEX Composite PipeNominal Pipe Size,mm (in.)Total WallThickness, min,mm (in.)WallTolerance(+) mmOuter PEXLayer Thickness,min, mm (in.)Inner PEXLayer Thickness,min, mm (in.)0912 (38) 1.60 (0.063) 0.40 (0.016) 0.40 (0.016) 0.70
47、0.028)1216 (12) 1.65 (0.065) 0.65 (0.022) 0.40 (0.016) 0.90 (0.035)1620 (58) 1.90 (0.075) 0.40 (0.016) 0.40 (0.016) 0.96 (0.038)2025 (34) 2.25 (0.089) 0.50 (0.020) 0.40 (0.016) 1.10 (0.043)2026 (78) 3.00 (0.118) 0.33 (0.013) 0.40 (0.016) 1.32 (0.052)2532 (1) 2.90 (0.114) 0.60 (0.024) 0.40 (0.016) 1
48、34 (0.053)3240 (114) 3.40 (0.134) 0.60 (0.024) 0.40 (0.016) 1.45 (0.057)4150 (112) 4.00 (0.157) 0.60 (0.024) 0.40 (0.016) 1.75 (0.069)5163 (2) 4.60 (0.181) 0.60 (0.024) 0.40 (0.016) 1.75 (0.069)6075 (212) 7.25 (0.285) 0.60 (0.024) 0.40 (0.016) 2.80 (0.110)TABLE 2 Wall Thickness for PEX-AL-PEX Compo
49、site PipeDiameter Nominal(DN)Nominal Pipe Size(NPS)Total WallThickness, min,mm (in.)WallTolerance(+) mm (in.)Outer PEXLayer Thickness,min, mm (in.)Inner PEXLayer Thickness,min, mm (in.)12 38 1.60 (0.063) 0.40 (0.016) 0.40 (0.016) 0.70 (0.028)16 14 1.65 (0.065) 0.65 (0.022) 0.40 (0.016) 0.90 (0.035)20 58 1.90 (0.075) 0.40 (0.016) 0.40 (0.016) 0.96 (0.038)25 34 2.25 (0.089) 0.50 (0.020) 0.40 (0.016) 1.10 (0.043)26 78 3.00 (0.118) 0.33 (0.013) 0.40 (0.016) 1.32 (0.052)32 1 2.90 (0.114) 0.60 (0.024) 0.40 (0.016) 1.34 (0.053)
