1、Designation: F 2788 09An American National StandardStandard Specification forCrosslinked Polyethylene (PEX) Pipe1This standard is issued under the fixed designation F 2788; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o
2、f 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. Scope1.1 This specification covers crosslinked polyethylene(PEX) pipe that is outside diameter controlled, made innominal pip
3、e dimension ratios, and pressure rated for water atthree temperatures (see Appendix X1). Included are require-ments and test methods for material, workmanship, dimen-sions, burst pressure, hydrostatic sustained pressure, excessivetemperature pressure, excessive temperature-pressure, environ-mental s
4、tress cracking, stabilizer functionality, bent-pipe hy-drostatic pressure, oxidative stability in potable chlorinatedwater, and degree of crosslinking. Requirements for pipemarkings are also given.1.2 The text of this specification references notes, footnotes,and appendixes, which provide explanator
5、y material. Thesenotes and footnotes (excluding those in tables and figures) shallnot be considered as requirements of the specification.1.3 Except for dimensions, the values stated in inch-poundunits are to be regarded as standard. The values given inparentheses are mathematical conversions to SI u
6、nits that areprovided for information only and are not considered standard.For dimensions, the values stated in SI units are to be regardedas standard. The values given in parentheses for nominal sizesare mathematical conversions to inch-pound units that areprovided for information only and are not
7、considered standard.NOTE 1Metric sized (SI units) pipe should only be joined withcorresponding metric sized fittings. Inch sized fittings should not be usedfor metric sized pipe.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is therespons
8、ibility 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:2D 618 Practice for Conditioning Plastics for TestingD 792 Test Methods for Density and Specifi
9、c Gravity (Rela-tive Density) of Plastics by DisplacementD 1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD 1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD 1599 Test Method for Resistance to Short-Time Hydrau-lic Pressure of Plastic Pi
10、pe, Tubing, and FittingsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD1898 Practice for Sampling of Plastics3D 2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD 2765 Test Methods for Determination of Gel Content andSwell Ratio of Crosslinked Ethylene Pla
11、sticsD 2837 Test Method for Obtaining Hydrostatic DesignBasis for Thermoplastic Pipe Materials or Pressure DesignBasis for Thermoplastic Pipe ProductsD 3895 Test Method for Oxidative-Induction Time of Poly-olefins by Differential Scanning CalorimetryF 412 Terminology Relating to Plastic Piping Syste
12、msF 2023 Test Method for Evaluating the Oxidative Resis-tance of Crosslinked Polyethylene (PEX) Tubing andSystems to Hot Chlorinated Water2.2 ANSI Standard:4B36.10 Standards Dimensions of Steel Pipe (IPS)2.3 Federal Standard:5FED-STD-123 Marking for Shipment (Civil Agencies)2.4 Military Standard:5MI
13、L-STD-129 Marking for Shipment and Storage2.5 NSF Standard:6NSF/ANSI 14 for Plastic Piping Components and RelatedMaterials1This test method is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.26 on OlefinBased Pipe.Current edi
14、tion approved Aug. 1, 2009. Published August 2009.2For 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.3Withdrawn.
15、 The last approved version of this historical standard is referencedon www.astm.org.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.5Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robb
16、ins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.6Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., AnnArbor, MI 48113-0140, http:/www.nsf.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.2.6 I
17、SO Standards:7ISO 1167 Thermoplastics pipes, fittings and assemblies forthe conveyance of fluids Determination of the resis-tance to internal pressure Part 1: General methodISO 4427 Plastic piping systems - Polyethylene (PE) pipesand fittings for water supplyISO 13760 Plastics pipes for the conveyan
18、ce of fluids underpressure Miners rule Calculation method for cumu-lative damageISO R 161-1690 Pipes of Plastic Materials for the Transportof Fluids (Outside Diameters and Nominal Pressures) Part1, Metric Series2.7 PPI Standards:8PPI TR-3 Policies and Procedures for Developing Hydro-static Design Ba
19、sis (HDB), Pressure Design Basis (PDB),Strength Design Basis (SDB), and Minimum RequiredStrength (MRS) Ratings for Thermoplastic Piping Mate-rials or PipePPI TR-4 PPI Listing of Hydrostatic Design Basis (HDB),Strength Design Basis (SDB), Pressure Design Basis(PDB) and Minimum Required Strength (MRS)
20、 Ratingsfor Thermoplastic Piping Materials or Pipe3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F 412, and abbreviations are in accordance with Ter-minology D 1600, unless otherwise specified. The abbreviationfor crosslinked polyethylene is PEX. Plastic pipe denotes ap
21、articular diameter schedule of plastic pipe in which outsidediameter of the pipe conforms with ISO 4427.3.2 Definitions of Terms Specific to This Standard:3.3 crosslinked polyethylene plasticsplastics prepared bycrosslinking (curing) polyethylene compounds.3.4 hydrostatic design stress (HDS)the esti
22、mated maxi-mum tensile stress the material is capable of withstandingcontinuously with a high degree of certainty that failure of thepipe will not occur. This stress is circumferential when internalhydrostatic water pressure is applied. The HDS is equal to thehydrostatic design basis (HDB) times the
23、 design factor (DF)for water. For this standard, the design factor is equal to 0.50.HDS 5 HDB 3 DF5 HDB 3 0.50 for this standard! (1)3.5 hydrostatic design basis (HDB)one of a series ofestablished stress values (specified in Test Method D 2837) fora plastic compound obtained by categorizing the long
24、-termhydrostatic strength determined in accordance with TestMethod D 2837.3.5.1 DiscussionA listing of HDB and HDS values arecontained in PPI publication PPI TR-43.6 pressure rating (PR)the estimated maximum waterpressure the pipe is capable of withstanding continuously witha high degree of certaint
25、y that failure of the pipe will not occur.3.7 relation between dimensions, hydrostatic design stress,and pressure ratingthe following expression, commonlyknown as the ISO equation9is used in this specification torelate dimensions, hydrostatic design stress, and pressurerating:2S/P5 Do/t!2 1 or(2)2S/
26、P 5 R2 IS = hydrostatic design stress, psi (or MPa),P = pressure rating, psi (or MPa),Do= average outside diameter, in. (or mm),t = minimum wall thickness, in. (or mm), andR = standard dimension ratio (SDR) or dimension ratio(DR)3.8 standard dimension ratio (SDR)/dimension ratio(DR)the ratio of outs
27、ide diameter to wall thickness. ForPEX-pipe, it is calculated by dividing the average outsidediameter of the pipe by the minimum wall thickness. If thecalculated dimension ratio is a Preferred Number Series R 10modified by +1 (7, 9, 11 etc.), then it is called an SDR(standard dimension ratio); for a
28、ll other numbers, it is called aDR.3.9 standard pipe material designation codeThe pipematerial designation code shall consist of the abbreviation forthe type of plastic (PEX) followed by four Arabic digits thatdescribe short-term properties in accordance with applicableASTM standards and as shown in
29、 Table 1.3.9.1 DiscussionThe first digit is for chlorine resistancetested in accordance with Test Method F 2023.(1) A digit “0” indicates that the PEX pipe either has not beentested for chlorine resistance or that the PEX pipe does notmeet the minimum requirement for chlorine resistance.(2) A digit
30、“1” indicates the PEX pipe has been tested and7Available from International Organization for Standardization (ISO), 1, ch. dela Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, http:/www.iso.ch.8Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,Irving, TX 75062,
31、 http:/www.plasticpipe.org.9ISO R1611690.TABLE 1 Material Designation Code CellsProperty Standard 0 1 2 3 4 5 6789ChlorineResistanceF 2023 Not testedor rated75 %at 73Fand 25 %at 140FReserved 50 %at 73Fand 50 %at 140FReserved 100 %at 140F. . . .Reserved . . . . . . . . . . .HDSfor water at73F. . . .
32、. . . 630 . 800 .F2788092meets the F XXXX requirement for minimum chlorine resis-tance at the end use condition of 25% at 140F (60C) and 75%at 73F (23C).(3) A digit “2” is reserved for future application.(4) A digit “3” indicates that the PEX pipe has been tested andmeets the F XXXX requirement for
33、minimum chlorine resis-tance at end use condition of 50% at 140F and 50% at 73F.(5) A digit “4” is reserved for future application.(6) A digit “5” indicates that the PEX pipe has been tested andmeets the requirement for minimum chlorine resistance at enduse conditions of 100% of the time at 140F3.9.
34、2 DiscussionThe second digit is a 909. This digit isreserved for a currently unspecified PEX pipe property.3.9.3 DiscussionThe last two digits are the hydrostaticdesign stress for water at 73F (23C) in units of 100 psi withany decimal figures dropped. Where the hydrostatic designstress code contains
35、 less than two figures, a zero is used beforethe number. Thus, a complete material designation code forPEX pipe shall consist of the three letters 9PEX9 and fourdigits.4. Pipe Classification4.1 GeneralThis specification covers one PEX pipe ma-terial having pressure ratings for water at three tempera
36、tures.The pressure ratings decrease as the temperature is increased.4.2 Standard Dimension Ratio (SDR)This specificationcovers PEX pipe in various standard dimension ratios anddimension ratios for nominal diameters 16 mm (12 in) andlarger. The pressure ratings are uniform for all nominal pipesizes w
37、ith the same DR or SDR.5. Materials5.1 GeneralCrosslinked polyethylene pipe, meeting therequirements of this specification, are primarily defined bymeans of three criteria, namely, (1) nominal density, (2) degreeof crosslinking, and (3) long-term strength tests. There is astrong correlation between
38、nominal density and results ofshort-term strength tests.NOTE 2PEX pipe intended for use in the transport of potable watershould be evaluated and certified as safe for this purpose by a testingagency acceptable to the local health authority. The evaluation should bein accordance with requirements for
39、 chemical extraction, taste, and odorthat are no less restrictive than those included in NSF/ANSI 14. The sealor mark of the laboratory making the evaluation should be included on thepipe.5.2 Basic MaterialsPEX pipe shall be made from poly-ethylene compounds which have been crosslinked by perox-ides
40、, Azo compounds, or silane compounds in extrusion, or byelectron beam after extrusion, or by other means such that thepipe meets the performance requirements of Section 6. For theuse temperatures that the pipe will be marked for, the materials,procedure for mixing, and the process for crosslinking s
41、hallresult in a product with long term hydrostatic stress ratingsequal better than those shown in Table 2, when determined inaccordance with procedures no less restrictive than those ofPPI TR-39. SeeAppendix X1 for additional information on PPIhydrostatic stress ratings.NOTE 3Pipe produced by crossl
42、inking by peroxides,Azo compounds,or silane compounds in extrusion, or by electron beam after extrusion havemet the requirements of Section 6. There are several other processes forproducing crosslinked polyethylene pipe. However, each process must beestablished as meeting the requirements of this sp
43、ecification.5.3 Pipe Material DesignationThe pipe meeting the re-quirements of this specification shall be designated PEX.6. Requirements6.1 WorkmanshipThe pipe shall be homogeneousthroughout and free of visible cracks, holes, foreign inclusions,or other defects. The pipe shall be as uniform as comm
44、erciallypracticable in color, opacity, density, and other physical prop-erties.6.2 Out-of RoundnessThe maximum out-of roundnessrequirements, shown in Table 3 for pipe, apply to the average,TABLE 2 Material Designation Code CellsDR/SDR Rated Temperature Hydrostatic Design Stress Pressure Rating for W
45、aterF C psi MPa Psig MPaDR 6 73.4 23 630 4.34 210 1.45180 82.2 400 2.76 160 1.10200 93.3 315 2.17 125 0.86DR 7.4 73.4 23 630 4.34 200 1.60180 82.2 400 2.76 125 0.86200 93.3 315 2.17 100 0.69SDR 9 73.4 23 630 4.34 160 1.10180 82.2 400 2.76 100 0.69200 93.3 315 2.17 80 0.55SDR 11 73.4 23 630 4.34 125
46、0.86180 82.2 400 2.76 80 0.55200 93.3 315 2.17 60 0.41DR 13.6 73.4 23 630 4.34 100 0.69180 82.2 400 2.76 60 0.41200 93.3 315 2.17 50 0.35DR 16.2 73.4 23 630 4.34 41 0.28180 82.2 400 2.76 26 0.18200 93.3 315 2.17 21 0.14SDR 17 73.4 23 630 4.34 80 0.55180 82.2 400 2.76 50 0.35200 93.3 315 2.17 40 0.28
47、F2788093measured diameter after rounding with a rounding tool recom-mended by the manufacturer.6.3 Dimensions and Tolerances:6.3.1 Outside DiametersThe outside diameters and toler-ances shall be as shown in Table 3, when measured inaccordance with 7.4 and 7.4.1.TABLE 3 Outside Diameters and Toleranc
48、es for PEX PipeNominal Pipe SizeAverage OutsideDiameterTolerances forAverage DiameterOut-of-RoundnessAmm in. mm mm mm16 (12) 16.15 60.15 1.220 (34) 20.15 60.15 1.225 (1) 25.15 60.15 1.232 (114) 32.15 60.15 1.340 (112) 40.20 60.20 1.450 (2) 50.20 60.20 1.463 (212) 63.20 60.20 1.575 (3) 75.25 60.25 1.
49、690 (312) 90.30 60.30 1.8110 (4) 110.35 60.35 2.2125 (5) 125.40 60.40 2.5140 (512) 140.45 60.45 2.8160 (6) 160.50 60.50 3.2180 (7) 180.55 60.55 3.6200 (8) 200.60 60.60 4.0225 (9) 225.70 60.70 4.5250 (10) 250.75 60.75 5.0280 (11) 280.85 60.85 9.8315 (12) 315.95 60.95 11.1355 (14) 356.10 61.10 12.5400 (16) 410.20 61.20 14.0450 (18) 451.35 61.35 15.6500 (20) 501.50 61.50 17.5560 (22) 561.70 61.70 19.6630 (25) 631.90 61.90 22.1AThe Out-of-Roundness specification applies only to pipe prior to coiling.TABLE 4 Wall Thickness an
