1、Designation: F877 11An American National StandardStandard Specification forCrosslinked Polyethylene (PEX) Hot- and Cold-WaterDistribution Systems1This standard is issued under the fixed designation F877; the number immediately following the designation indicates the year of originaladoption or, in t
2、he case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers requirements, test methods,and marking requirements for sy
3、stem components when testedwith nominal SDR9 crosslinked polyethylene tubing as asystem. Systems are intended for 100 psi (0.69 MPa) waterservice up to and including a maximum working temperatureof 180F (82C). Requirements and test methods are includedfor materials, workmanship, dimensions and toler
4、ances, burstpressure, sustained pressure, excessive temperature and pres-sure, and thermo-cycling tests. The components covered bythis specification are intended for use in residential andcommercial, hot and cold, potable water distribution systems orother applications such as municipal water servic
5、e lines,radiant panel heating systems, hydronic baseboard heatingsystems, snow and ice melting systems, and building servicespipe.1.2 The text of this specification references notes, footnotes,and appendixes which provide explanatory material. Thesenotes and footnotes (excluding those in tables and
6、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 stresses and hydrostatic pres-sure ratings for tubing
7、 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 hazards caveat pertains only to thetest method p
8、ortion, 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 determine the applicability of regulatory limita
9、-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD1599 Test Method for Resistance to Short-Time HydraulicPressure of Plastic Pipe, Tubing, and Fitting
10、sD1600 Terminology for Abbreviated Terms Relating toPlasticsD1898 Practice for Sampling of Plastics3D2749 Symbols for Dimensions of Plastic Pipe FittingsD2837 Test Method for Obtaining Hydrostatic Design Basisfor Thermoplastic Pipe Materials or Pressure Design Basisfor Thermoplastic Pipe ProductsD31
11、40 Practice For Flaring Polyolefin Pipe And Tubing3F412 Terminology Relating to Plastic Piping SystemsF876 Specification for Crosslinked Polyethylene (PEX)TubingF1960 Specification for Cold Expansion Fittings with PEXReinforcing Rings for Use with Cross-linked Polyethylene(PEX) TubingF1961 Specifica
12、tion for Metal Mechanical Cold Flare Com-pression Fittings with Disc Spring for Crosslinked Poly-ethylene (PEX) TubingF1807 Specification for Metal Insert Fittings Utilizing aCopper Crimp Ring for SDR9 Cross-linked Polyethylene(PEX) Tubing and SDR9 Polyethylene of Raised Tempera-ture (PE-RT) TubingF
13、1865 Specification for Mechanical Cold Expansion InsertFitting With Compression Sleeve for Cross-linked Polyeth-ylene (PEX) TubingF2080 Specification for Cold-Expansion Fittings WithMetal Compression-Sleeves for Cross-Linked Polyethyl-ene (PEX) Pipe1This specification is under the jurisdiction of AS
14、TM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.61 on Water.Current edition approved June 1, 2011. Published July 2011. Originally approvedin 1984. Last previous approved 2007 as F877 07. DOI: 10.1520/F0877-11.2For referenced ASTM standards, visit the A
15、STM 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. The last approved version of this historical standard is referencedon www.astm.org.1*A Summa
16、ry of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.F2159 Specification for Plastic Insert Fittings Utilizing aCopper Crimp Ring for SDR9 Cross-linked Polyethylene(PEX) Tubing and
17、SDR9 Polyethylene of Raised Tempera-ture (PE-RT) TubingF2434 Specification for Metal Insert Fittings Utilizing aCopper Crimp Ring for SDR9 Cross-linked Polyethylene(PEX) Tubing and SDR9 Cross-linked Polyethylene/Aluminum/Cross-linked Polyethylene (PEX-AL-PEX)TubingF2735 Specification for Plastic Ins
18、ert Fittings For SDR9Cross-linked Polyethylene (PEX) and Polyethylene ofRaised Temperature (PE-RT) 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
19、Marking for Shipment (Civil Agencies)62.5 Military Standard:MIL-STD-129 Marking for Shipment and Storage62.6 NSF Standard:NSF/ANSI Standard No. 14 for Plastic Piping Componentsand Related Materials7NSF/ANSI Standard No. 61 for Drinking Water SystemComponents-Health Effects73. Terminology3.1 The term
20、inology used in this specification is in accor-dance with Terminology F412, Terminology D1600, and Sym-bols D2749, unless otherwise specified. The abbreviation forcrosslinked polyethylene is PEX. Plastic tubing denotes aparticular diameter schedule of plastic pipe in which outsidediameter of the tub
21、ing is equal to the nominal size plus18 in.Plastic pipe outside diameter schedule conforms to ANSIB 36.10.3.2 Definitions of Terms Specific to This Standard:3.2.1 crosslinked polyethylene plasticsplastics preparedby crosslinking (curing) polyethylene compounds.3.2.2 fittingan appurtenance such as co
22、upling, elbow ortee used to connect tubing or as an accessory to tubing.3.2.3 standard dimension ratio (SDR)a selected series ofnumbers in which the average outside diameter to minimumwall thickness dimension ratios are constant for all sizes oftubing in each standard dimension ratio, and which are
23、theANSI Z 17.1 Preferred Number Series R 10 modified by +1.3.2.4 manifoldan appurtenance that has at least one inletand multiple outlets.3.2.5 system componentsfittings and manifolds.4. Materials4.1 General PEX systems shall use crosslinked polyeth-ylene tubing as described in Specification F876.4.2
24、 Fitting and manifold materials shall meet the applicablerequirements as described in Specifications F1807, F1865,F1960, F1961, F2080, F2159, F2434,orF2735.4.3 CertificationPEX tubing and system components,used for the distribution of potable water, shall be productsapproved for that service by the
25、regulatory bodies having suchjurisdiction. These products shall be tested for that service bya nationally recognized and accredited testing laboratory andshall bear the certification mark of the testing agency.5. Classification5.1 FittingsThis specification classifies fittings includingmanifolds, in
26、tended for use in systems with PEX tubing, by amaximum 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 pressure capability, and bythermocycling. Fittings
27、 shall be compatible with tubing madeto the requirements of Specification F876.6. Requirements6.1 WorkmanshipFittings shall be made from materialsthat are homogeneous throughout and free of visible cracks,holes, foreign inclusions, or other defects. All sealing surfacesshall be smooth and free of fo
28、reign material. The walls offittings and manifolds shall be free of cracks, holes, blisters,voids, foreign inclusions, or other defects that are visible to thenaked eye and may affect fitting integrity.6.2 Dimensions and Tolerances:6.2.1 The dimensions and tolerances of fittings shall meetthe specif
29、ic requirements contained in Specifications F1807,F1865, F1960, F1961, F2080, F2159, F2434, and F2735 orother recognized specification.6.2.2 Fittings shall be compatible with tubing made to therequirements of Specification F876.6.3 Corrosion ResistanceFittings shall be made frommaterials that are ge
30、nerally regarded as corrosion resistant.6.3.1 Compliance with this specification requires that fit-tings contained in Specifications F1807, F1865, F1960, F1961,F2080, F2159, F2434, and F2735 must meet the Performanceand Test Method requirements of F877.6.4 Hydrostatic Burst:6.4.1 Tubing and fittings
31、 (tested as assemblies) assembledusing the manufacturers instructions shall meet the minimumhydrostatic burst requirements shown in Table 1 when tested inaccordance with 7.6.6.4.2 Manifolds with integral shut-offs (valves) shall betested with all ports in the full-open or unrestricted position.6.4.2
32、.1 If the manifold has more than one connection size,the test pressure selected from Table 1 shall be based upon thelargest nominal PEX connection.6.5 Hydrostatic Sustained Pressure Strength6.5.1 Tubing and fittings (tested as assemblies) shall meetthe minimum hydrostatic sustained pressure strength
33、 require-ments shown in Table 2 when tested in accordance with 7.4.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.5Available from American Water Works Association (AWWA), 6666 W. QuincyAve., Denver, CO 80235, http:/www.a
34、wwa.org.6Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/dodssp.daps.dla.mil.7Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., AnnArbor, MI 48113-0140, http:/www.nsf.org.F877 1126.5.1.1 Manifol
35、ds with integral shut-off (valves) shall betested with all ports in the full-open or unrestricted position.6.6 Thermocycling:6.6.1 Fittings, assembled using the manufacturers instruc-tions, shall not leak after completion of 1000 cycles betweenthe temperatures of 60F (16C) and 180F (82C) when tested
36、in accordance with 7.5.6.6.1.1 Manifolds with integral shut-offs (valves) shall betested with all ports in the full open or unrestricted position.6.7 Excessive TemperaturePressure Capability:6.7.1 GeneralIn the event of a water heating systemmalfunction, PEX tubing and system components shall havead
37、equate strength to accommodate short-term conditions, 48 hof 210F (99C), 150 psi (1034 kPa) until repairs can be made.6.7.2 Excessive Temperature Hydrostatic SustainedPressureTubing and system components, when tested asassemblies, shall not fail as defined in Test Method D1598 inless than 30 days (7
38、20 h) when tested in accordance with 7.7.6.7.2.1 Manifolds with integral shut-offs (valves) shall betested with all ports in the full open or unrestricted position.NOTE 2Tests applicable to assemblies and bends (6.4, 6.5, 6.6, and6.7) are intended to be performance qualification tests and not testsr
39、equired of each fitting.7. Test Methods7.1 ConditioningThe test specimens should be condi-tioned at 70 to 77F (23 6 2C) and 50 6 5 % relativehumidity for not less than 40 h prior to test in accordance withPractice D618, for those tests where conditioning is required.7.2 Test ConditionsConduct the te
40、sts in the standardlaboratory atmosphere of 70 to 77F (23 6 2C) and 50 6 5%relative humidity, unless otherwise specified in the test meth-ods or in this specification.7.3 SamplingA sufficient quantity of tubing and systemcomponents, as agreed upon by the purchaser and the seller,shall be selected an
41、d tested to determine conformance with thisspecification (see Practice D1898). In the case of no prioragreement, random samples selected by the testing laboratoryshall be deemed adequate.7.4 Hydrostatic Sustained Pressure Determine in accor-dance with Test Method D1598, except for the following:7.4.
42、1 Test at least six joints, from randomly selected speci-mens assembled per the manufacturers instructions with atleast 5-pipe diameters between joints.7.4.2 Test temperature shall be 180 6 4F (82 6 2C).7.4.3 The external test environment shall be air or water.7.4.4 Fill the specimens with water at
43、a temperature of atleast 120F (50C).7.5 Thermocycling:7.5.1 Summary of Test MethodThis test method describesa pass-fail test for thermally cycling PEX tubing and systemcomponent assemblies over a critical temperature range for aselected number of cycles while subjected to a nominal internalpressure.
44、 This test method provides a measure of resistance tofailure due to the combined effects of differential thermalexpansion and creep for PEX tubing and fittings intended forcontinuous use up to and including 180F (82C).7.5.2 ApparatusA nitrogen or air source capable of main-taining a nominal internal
45、 pressure of 100 6 10 psi (0.69 60.069 MPa) on the specimens is required. The immersionsystem shall consist of two water reservoirs controlled at 60 64F (166 2C) and 180 6 4F (82 6 2C). The specimen shallbe cycled from one reservoir to the other or the hot and coldwater shall be alternately cycled o
46、ver the test specimensautomatically and returned to the proper reservoirs.NOTE 3Automatic cycling may be accomplished by pumping fromeach reservoir, through a delivery system having timer-actuated valves, toa specimen water trough having synchronized, timer-actuated returndrains. Any automatic appar
47、atus shall provide for complete immersion ofthe test specimen in the trough.7.5.3 Sampling and Specimen Preparation Select at leastsix joints from randomly selected specimens assembled per themanufacturers instructions. Close the specimen assembly withany suitable end closures that allow “free-end”
48、mounting andwill not leak under the thermocycling conditions, and connectthe specimen assembly to the pressure source.7.5.4 ProcedurePressurize the specimen assembly withnitrogen or air to 100 6 10 psi (0.69 6 0.069 MPa) . Immersein 60 6 4F (16 6 2C) water to determine if there are anyinitial leaks.
49、 All leaks shall be eliminated before the thermo-cycling test is started. Thermally cycle the specimen assemblyeither manually or automatically and under an internal pressureof 100 6 10 psi (0.696 0.069 MPa), alternately between 60 64F (16 6 2C) and 180 6 4F (82 6 2C) by means ofimmersion in water using the following test cycle:Water immersion at 180F (82C) 2 min (min)Air immersion at ambient 2 min (max)Water immersion at 60F (16C) 2 min (min)Air immersion at ambient 2 min (max)TABLE 1 Burst Pressure Requirements fo
