1、Designation: F 877 07An American National StandardStandard Specification forCrosslinked Polyethylene (PEX) Plastic Hot- and Cold-WaterDistribution Systems1This standard is issued under the fixed designation F 877; the number immediately following the designation indicates the year oforiginal adoptio
2、n 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 specification covers requirements, test methods,and methods of markin
3、g for crosslinked polyethylene plastichot- and cold-water distribution systems components made inone standard dimension ratio and intended for 100 psi (0.69MPa) water service up to and including a maximum workingtemperature of 180F (82C). Components are comprised oftubing and fittings. Requirements
4、and test methods are in-cluded for materials, workmanship, dimensions and tolerances,burst pressure, sustained pressure, excessive temperature andpressure, temperature cycling tests, and bend strength. Alsoincluded are tests related to system malfunctions. The compo-nents covered by this specificati
5、on are intended for use inresidential and commercial, hot and cold, potable water distri-bution systems as well as sealed central heating, includingunder-floor heating systems.1.2 The text of this specification references notes, footnotes,and appendixes which provide explanatory material. Thesenotes
6、 and footnotes (excluding those in tables and figures) shallnot be considered as requirements of the specification.1.3 The values stated in inch-pound units are to be regardedas the standard. The values stated in parentheses are providedfor information only.NOTE 1Suggested hydrostatic design stresse
7、s and hydrostatic pres-sure ratings for tubing and fittings are listed in Appendix X1. Design,assembly, and installation considerations are discussed in Appendix X2.An optional performance qualification and an in-plant quality controlprogram are recommended in Appendix X3.1.4 The following safety ha
8、zards caveat pertains only to thetest method portion, Section 7, 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 de
9、termine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2D 618 Practice for Conditioning Plastics for TestingD 1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD 1599 Test Method for Resistance to Short-Time Hydra
10、u-lic Pressure of Plastic Pipe, Tubing, and FittingsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 1898 Practice for Sampling of Plastics3D 2749 Symbols for Dimensions of Plastic Pipe FittingsD 2837 Test Method for Obtaining Hydrostatic DesignBasis for Thermoplastic Pipe Materials or
11、Pressure DesignBasis for Thermoplastic Pipe ProductsD 3140 Practice for Flaring Polyolefin Pipe and Tubing3F 412 Terminology Relating to Plastic Piping SystemsF 876 Specification for Crosslinked Polyethylene (PEX)TubingF 1960 Specification for Cold Expansion Fittings with PEXReinforcing Rings for Us
12、e with Cross-linked Polyethylene(PEX) TubingF 1961 Specification for Metal Mechanical Cold FlareCompression Fittings with Disc Spring for CrosslinkedPolyethylene (PEX) TubingF 1807 Specification for Metal Insert Fittings Utilizing aCopper Crimp Ring for SDR9 Cross-linked Polyethylene(PEX) TubingF 18
13、65 Specification for Mechanical Cold Expansion InsertFitting With Compression Sleeve for Cross-linked Polyeth-ylene (PEX) TubingF 2080 Specification for Cold-Expansion Fittings WithMetal Compression-Sleeves for Cross-Linked Polyethyl-ene (PEX) Pipe1This specification is under the jurisdiction of AST
14、M Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.61 on Water.Current edition approved Feb. 1, 2007. Published February 2007. Originallyapproved in 1984. Last previous approved 2005 as F 877 05.2For referenced ASTM standards, visit the ASTM website, www.as
15、tm.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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United Stat
16、es.F 2159 Specification for Plastic Insert Fittings Utilizing aCopper Crimp Ring for SDR9 Cross-linked Polyethylene(PEX) TubingF 2434 Specification for Metal Insert Fittings Utilizing aCopper Crimp Ring for SDR9 Cross-linked Polyethylene(PEX) Tubing and SDR9 Cross-linked Polyethylene/Aluminum/Cross-
17、linked Polyethylene (PEX-AL-PEX)Tubing2.2 ANSI Standards:B 36.10 Welded and Seamless Wrought Steel Pipe4Z 17.1 Preferred Numbers42.3 AWWA Standard:Manual M-11, Steel Pipe Design and Installation52.4 Federal Standard:Fed Std. No. 123 Marking for Shipment (Civil Agencies)62.5 Military Standard:MIL-STD
18、-129 Marking for Shipment and Storage62.6 NSF Standard:Standard No. 14 for Plastic Piping Components and RelatedMaterials73. Terminology3.1 The terminology used in this specification is in accor-dance with Terminology F 412, Terminology D 1600, andSymbols D 2749, unless otherwise specified. The abbr
19、eviationfor crosslinked polyethylene is PEX. Plastic tubing denotes aparticular diameter schedule of plastic pipe in which outsidediameter of the tubing is equal to the nominal size plus18 in.Plastic pipe outside diameter schedule conforms to ANSIB 36.10.3.2 crosslinked polyethylene plasticsplastics
20、 prepared bycrosslinking (curing) polyethylene compounds.3.3 relation between standard dimension ratio, stress, andinternal pressurethe following expressions, commonlyknown as the ISO equation, is used to relate standard dimen-sion ratio, stress, and internal pressure for tubing:2S/P 5 R 2 1or2S/P 5
21、Do/t!21where:S = stress in circumferential or hoop direction, psi (MPa),P = internal pressure, psi (MPa),t = minimum wall thickness, in.,R = standard dimension ratio, SDR, andDo= average outside diameter, in.3.4 standard dimension ratio (SDR)a selected series ofnumbers in which the average outside d
22、iameter to minimumwall thickness dimension ratios are constant for all sizes oftubing in each standard dimension ratio, and which are theANSI Z 17.1 Preferred Number Series R 10 modified by +1. Ifthe wall thickness calculated by SDR for PEX tubing is lessthan 0.070 in. (1.78 mm), it shall be arbitra
23、rily increased to0.070 in. except for sizes14 in. and smaller.3.5 standard material designation codethe crosslinkedpolyethylene tubing material designation code shall consist ofthe abbreviation PEX.3.6 manifoldan appurtenance that has at least one inletand multiple outlets.4. Materials4.1 General PE
24、X tubing materials shall meet the require-ments as described in Specification F 876. Fitting and manifoldmaterials shall meet the applicable requirements as describedin Specifications F 1807, F 1865, F 1960, F 1961, F 2080,F 2159,orF 2434.4.2 Basic Materials DescriptionCrosslinked polyethylenetubing
25、 meeting the requirements of this specification areprimarily defined by two criteria namely, basic short-termproperties and long-term hydrostatic strength, 4.2.1 and 4.2.2respectively.4.2.1 Basic Short-Term PropertiesThis specification cov-ers tubing materials meeting the requirements of Specificati
26、onF 876.4.2.2 Long-Term Hydrostatic Pressure StrengthThisspecification covers PEX tubing which is further defined on thebasis of long-term hydrostatic strength tests (Appendix X1).4.3 CertificationPEX tubing and fittings, used for thedistribution of potable water, shall be products approved forthat
27、service by the regulatory bodies having such jurisdiction.These products shall be tested for that service by a nationallyrecognized and accredited testing laboratory and shall bear thecertification mark of the testing agency.5. Classification5.1 TubingThis specification classifies PEX tubing by asin
28、gle standard dimension ratio that shall be SDR 9, and by amaximum continuous use temperature that shall be 180F(82C), and by nominal tubing diameters from18 in. through 6in.5.2 FittingsThis specification classifies fittings includingmanifolds, intended for use in systems with PEX tubing, by amaximum
29、 continuous use temperature that shall be 180F(82C) and by nominal sizes from18 in. through 6 in. on thebasis of resistance to burst pressure, hydrostatic sustainedpressure, excessive temperature and pressure, and by ther-mocycling.6. Requirements6.1 WorkmanshipThe tubing shall be homogeneousthrough
30、out and free of visible cracks, holes, foreign inclusions,or other defects. The pipe shall be as uniform as commerciallypracticable in color, opacity, density, and other physical prop-erties.6.2 Dimensions and Tolerances:4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4t
31、h Floor, New York, NY 10036.5Available from the American Water Works Association, 6666 W. Quincey Ave.,Denver, CO 80235.6Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.7Available from the National Sanitation Foundatio
32、n, P.O. Box 1468, Ann Arbor,MI 48106.F8770726.2.1 Compliance with this specification requires that fit-tings contained in Specifications F 1807, F 1865, F 1960,andF 1961 must meet the Performance and Test Method require-ments of F 877.6.2.1.1 TubingThe PEX tubing shall meet the require-ments of Spec
33、ification F 876. The tolerances for outsidediameters are also given in Table 1.6.2.1.2 Out-of-RoundnessThe maximum out-of-roundness requirements, shown in Table 1 for tubing, apply tothe average measured diameter after rounding with a roundingtool recommended by the manufacturer.6.2.2 Wall Thickness
34、Table 2 provides for wall thicknesstolerances. Calculated SDR 9 tubing wall thickness that fallbelow 0.070 in. (1.78 mm) shall be arbitrarily increased to thatvalue except for sizes14 in. and smaller.6.2.3 Fittings (Basic Dimensions)Fittings shall be com-patible with tubing made to the requirements
35、of Table 1 andTable 2. Fittings shall be made from materials that aregenerally regarded as corrosion resistant.6.3 Hydrostatic Burst:6.3.1 Tubing and fittings (tested as assemblies) shall meetthe minimum hydrostatic burst requirements shown in Table 3when tested in accordance with 7.6.6.3.2 Fittings
36、 assembled using the manufacturers instruc-tions shall meet the minimum hydrostatic burst requirementshown in Table 3 when tested in accordance with 7.6.6.3.2.1 If present, valves shall be tested in the open orunrestricted position.6.3.2.2 If the manifold has more than one connection size,the test p
37、ressure selected from Table 3 shall be based upon thelargest nominal PEX connection.6.4 Hydrostatic Sustained Pressure Strength6.4.1 Tubing and fittings (tested as assemblies) shall meetthe minimum hydrostatic sustained pressure strength require-ments shown in Table 4 when tested in accordance with
38、7.4.6.4.1.1 If present, valves shall be tested in the open orunrestricted position.6.5 Thermocycling:6.5.1 Fittings, assembled using the manufacturers instruc-tions, shall not leak after completion of 1000 cycles betweenthe temperatures of 60F (16C) and 180F (82C) when testedin accordance with 7.5.6
39、.5.1.1 If present, valves shall be tested in the open orunrestricted position.6.6 Bent Tube Hydrostatic Sustained Pressure Strength:TABLE 1 Outside Diameters and Tolerances for PEX TubingNominal Tubing Size Average Outside Diameter Tolerances for Average Diameter Out of RoundnessAin. mm in. mm in. m
40、m in. mm18 3 0.250 6.35 60.003 60.08 0.008 0.2014 7 0.375 9.52 60.003 60.08 0.008 0.20516 8 0.430 10.92 60.003 60.08 0.008 0.2038 10 0.500 12.70 60.003 60.08 0.012 0.3212 13 0.625 15.88 60.004 60.10 0.016 0.4058 16 0.750 19.05 60.004 60.10 0.016 0.4034 19 0.875 22.22 60.004 60.10 0.016 0.401 25 1.12
41、5 28.58 60.005 60.12 0.020 0.48114 32 1.375 34.92 60.005 60.12 0.020 0.48112 38 1.625 41.28 60.006 60.16 0.024 0.602 51 2.125 53.98 60.006 60.16 0.030 0.76212 64 2.625 66.68 60.007 60.18 0.038 0.953 76 3.125 79.38 60.008 60.20 0.045 1.14312 89 3.625 92.08 60.008 60.20 0.046 1.164 102 4.125 104.78 60
42、.009 60.23 0.052 1.32412 114 4.625 117.48 60.009 60.23 0.059 1.495 127 5.125 130.18 60.010 60.25 0.065 1.656 152 6.125 155.58 60.011 60.28 0.072 1.83AThe out-of-roundness specification applies only to tubing prior to coiling.TABLE 2 Wall Thickness and Tolerances for PEX SDR 9 PlasticTubingNominal Tu
43、bing Minimum Wall Thickness Tolerancein. mm in. mm in. mm18 3 0.047A1.19A+0.007 +0.1814 7 0.062A1.57A+0.010 +0.25516 8 0.064 1.63 +0.010 +0.2538 10 0.070A1.78A+0.010 +0.2512 13 0.070A1.78A+0.010 +0.2558 16 0.083 2.12 +0.010 +0.2534 19 0.097 2.47 +0.010 +0.251 25 0.125 3.18 +0.013 +0.33114 32 0.153 3
44、.88 +0.015 +0.38112 38 0.181 4.59 +0.019 +0.482 51 0.236 6.00 +0.024 +0.61212 64 0.292 7.41 +0.030 +0.763 76 0.347 8.82 +0.033 +0.84312 89 0.403 10.23 +0.035 +0.894 102 0.458 11.64 +0.040 +1.02412 114 0.514 13.05 +0.045 +1.145 127 0.569 14.46 +0.050 +1.276 152 0.681 17.29 +0.060 +1.52AFor tubing siz
45、es of12 in. and below, wall thickness minimums are notfunctions of SDR.TABLE 3 Minimum Hydrostatic Burst Strength Requirements forPEX Tubing and FittingsNominal Tubing Size Minimum Burst Pressures atDifferent Temperaturesin. mm psiAat73.4F(MPa) at(23C)psiAat180F(MPa) at(82.2C)18 3 870 (6.00) 390 (2.
46、69)14 7 752 (5.19) 336 (2.32)38 10 620 (4.27) 275 (1.90)12 13 480 (3.31) 215 (1.48)58 andlarger16 and larger 475 (3.27) 210 (1.45)AThe fiber stress used to derive this test pressure is:at 73.4F (23.0C) 1900 psi (13.10 MPa).at 180F (82.2C) 850 psi (5.86 MPa).F8770736.6.1 GeneralPEX tubing, up to and
47、including 1in. nomi-nal diameter, can be installed bent by using either of twotechniques described in X2.3.5 and X2.3.6 provided that 6.6.2and 6.6.3 requirements are met.NOTE 2PEX tubing, larger than 1 in. nominal diameter, is typicallyinstalled as main distribution lines and is installed in staight
48、 runs. Fittingsare used when a change in direction of 90 or greater and a bend radius of6 times the outside diameter is needed. The test procedures in 6.6.2 and6.6.3 are intended to evaluate PEX tubing installed in tight bendapplications in accordance with the procedures in X2.3.5 and X2.3.6. Thisap
49、plication applies to tubing up to and including 1 in. nominal diameteronly.6.6.2 Hot-bent tubing, with a radius of 2.5 times the outsidediameter and consisting of a continuous bend length inducingnot less than 90 angle, shall meet the minimum hydrostaticsustained pressure strength requirements shown in Table 4when tested in accordance with 7.4. The bend length and bendangle is kept throughout the testing period by rigid supportsimmediately outside the bend.6.6.3 Cold-bent tubing, with a radius of 6 times th
