1、Designation: F2854 10 (Reapproved 2016)Standard Specification forPush-Fit Crosslinked Polyethylene (PEX) MechanicalFittings for Crosslinked Polyethylene (PEX) Tubing1This standard is issued under the fixed designation F2854; the number immediately following the designation indicates the year oforigi
2、nal 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. Scope1.1 This specification covers crosslinked polyethylene(PEX) push-fit
3、 mechanical fittings for use with crosslinkedpolyethylene (PEX) tubing in12,34, 1 and 114 in. nominaldiameters that meet the requirements of Specification F876.These fittings are intended for use in residential andcommercial, hot and cold, potable water distribution systems aswell as hydronic heatin
4、g, including under-floor heatingsystems, up to and including 100 psig (6.90 bar) and 180F(82C). Included are the requirements for materials,workmanship, dimensions, performance, and markings to beused on the fittings.1.2 The values stated in inch-pound units are to be regardedas standard. The values
5、 given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 The text of this specification references notes, footnotes,and appendixes which provide explanatory material. Thesenotes and footnotes (excluding those in tables an
6、d figures) shallnot be considered as requirements of the specification.1.4 This standard does not purport to address all of thesafety 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 th
7、e applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A269/A269M Specification for Seamless and Welded Aus-tenitic Stainless Steel Tubing for General ServiceA276/A276M Specification for Stainless Steel Bars andShapesA312/A312M Specification for Seamless,
8、Welded, andHeavily Cold Worked Austenitic Stainless Steel PipesA351/A351M Specification for Castings, Austenitic, forPressure-Containing PartsB16/B16M Specification for Free-Cutting Brass Rod, Barand Shapes for Use in Screw MachinesB140/B140M Specification for Copper-Zinc-Lead (RedBrass or Hardware
9、Bronze) Rod, Bar, and ShapesB283/B283M Specification for Copper and Copper-AlloyDie Forgings (Hot-Pressed)B371/B371M Specification for Copper-Zinc-Silicon AlloyRodB395/B395M Specification for U-Bend Seamless Copperand Copper Alloy Heat Exchanger and Condenser TubesD618 Practice for Conditioning Plas
10、tics 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 TechniqueD1599 Test Method for Resistance to Short-Time HydraulicPressure of Plastic Pipe, Tubing, and FittingsD1600 Ter
11、minology forAbbreviated Terms Relating to Plas-ticsD2000 Classification System for Rubber Products in Auto-motive ApplicationsD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD2765 Test Methods for Determination of Gel Content andSwell Ratio of Crosslinked Ethylene Pla
12、sticsD6284 Test Method for Rubber PropertyEffect of Aque-ous Solutions with Available Chlorine and ChloramineD6394 Specification for Sulfone Plastics (SP)F412 Terminology Relating to Plastic Piping SystemsF876 Specification for Crosslinked Polyethylene (PEX) Tub-ingF877 Specification for Crosslinked
13、 Polyethylene (PEX) Hot-and Cold-Water Distribution Systems1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.Current edition approved Aug. 15, 2016. Published August 2016. Originallyapprove
14、d in 2010. Last previous edition approved in 2010 as F285410. DOI:10.1520/F285410R16.2For 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
15、page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1F2023 Test Method for Evaluating the Oxidative Resistanceof Crosslinked Polyethylene (PEX) Pipe, Tubing andSystems to Hot Chlorinated Water2.2 PPI Standards:3PPI
16、TR-3 Policies and Procedures for Developing Hydro-static Design Basis (HDB), Pressure Design Basis (PDB),Strength Design Basis (SDB), and Minimum RequiredStrength (MRS) Ratings for Thermoplastic Piping Mate-rials or Pipe2.3 NSF Standard:4NSF Standard No. 14 for Plastic Piping Components andRelated M
17、aterials2.4 EN Standards:5EN 12164 Copper and copper alloys - Rod for free machin-ing purposesEN 12165 Copper and copper alloys - Wrought and un-wrought forging stockEN 12168 Copper and copper alloys - Hollow rod for freemachining purposes2.5 ISO Standard:6ISO 9080 Plastics piping and ducting system
18、s - Determina-tion of the long-term hydrostatic strength of thermoplas-tics materials in pipe form by extrapolation3. Terminology3.1 Definitions are in accordance with Terminology F412and abbreviations are in accordance with Terminology D1600,unless otherwise indicated.3.2 Definitions of Terms Speci
19、fic to This Standard:3.2.1 push-fit fittingA type of fitting that joins pipes thatare not caulked, threaded, soldered, cemented, brazed orwelded. These joints consist of elastomeric seals and tubegrippers. Such joints must be installed in accordance to themanufacturers instructions.4. Classification
20、4.1 This specification covers PEX bodied push-fit fittingssuitable for use with PEX tubing that meets the requirements ofSpecification F876.5. Materials and Manufacture5.1 Fitting BodyThe fitting body shall be made fromcrosslinked polyethylene compounds suitable for elevatedtemperature pressure serv
21、ice.NOTE 1Since fittings specified by this standard will be used in hot andcold water plumbing systems, a material used to manufacture fittings inaccordance with this specification must demonstrate qualities consistentwith that application in addition to the fitting performance requirements ofthis s
22、pecification. Those qualifying characteristics include, but are notlimited to, an established hydrostatic design basis (HDB) or stress designbasis (SDB) in accordance with PPI TR-3, or an ISO 9080 compliantminimum required stress (MRS), or similar rating.5.2 Tubular StiffenerIf required by the manuf
23、acturer, atubular stiffener shall be used. It shall support the PEX tubingat least in the areas of sealing and gripping. Split stiffenersshall not be used. The stiffener shall be made from one of thefollowing:5.2.1 Machined BrassMachined brass stiffeners shall bemade from material meeting the requir
24、ements of SpecificationB371/B371M copper alloy UNS No. C69300, SpecificationB140/B140M copper alloy UNS No. C31400, SpecificationB283/B283M copper alloy UNS No. C37700, SpecificationB16/B16M copper-alloy UNS C36000 or copper alloy UNSC38500 or DIN 17660 CuZn39Pb3, Standard EN 12168copper Alloy CW614
25、N, Standard EN 12164 copper AlloyCW614N or copper alloy UNS No. C35330, or Standard EN12165 copper Alloy CW617N.5.2.2 Machined Stainless SteelMachined stainless steelstiffeners shall be made from material meeting the require-ments of Specification A312/A312M stainless steel alloy 304,304L, 316 or 31
26、6L, (UNS Nos. S30400, S30403, S31600 orS31603), Specification A269/A269M stainless steel alloy 304,304L, 316, 316L (UNS Nos. S30400, S30403, S31600 orS31603), Specification A276/A276M stainless steel alloy 304,401L, 316, or 316L (UNS Nos. S30400, S30403, S31600 orS31603), or Specification A351/A351M
27、 stainless steel UNSNo. J92800.5.2.3 PolysulfonePolysulfone stiffeners shall be moldedfrom sulfone plastic (SP) as specified in Specification D6394.The material shall be unreinforced polysulfone (group 01, class1, grade 0).5.3 O-ringsO-rings shall be made from an elastomericmaterial with a minimum t
28、ensile strength of 1450 psi (10.0MPa) as classified in Classification D2000 and shall meet theperformance requirements of 6.10.5.4 Tube grippersMetallic components in the tube grip-pers shall be made of Series 300 stainless steel.5.5 Potable Water RequirementsProducts intended forcontact with potabl
29、e water shall be evaluated, tested, andcertified for conformance with the health effects portion ofNSF Standard No. 14 by an acceptable certifying organizationwhen required by the regulatory authority having jurisdiction.6. Performance Requirements6.1 GeneralUnless otherwise stated, all performance
30、testsshall be performed on the number of fittings required to obtainsix mechanical ends assembled with PEX tubing. PEX tubingused for testing purposes shall meet the requirements ofSpecification F876. All assemblies used for test specimensshall be assembled in accordance with the fitting manufactur-
31、ers written installation instructions. Use separate sets ofassemblies for each performance test requirement with theexception of 6.4.6.2 All applicable fitting requirements of SpecificationF877, Section 6 Requirements , shall be met.3Available from Plastics Pipe Institute (PPI), 105 Decker Court, Su
32、ite 825,Irving, TX 75062, http:/www.plasticpipe.org.4Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., AnnArbor, MI 48113-0140, http:/www.nsf.org.5Available from European Committee for Standardization (CEN), 36 rue deStassart, B-1050, Brussels, Belgium, http:/www.cenorm.be.6Avai
33、lable from International Organization for Standardization (ISO), 1, ch. dela Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, http:/www.iso.ch.F2854 10 (2016)26.3 DimensionsAny randomly selected fitting or fittingsshall be used to determine dimensions. Measurements shall bemade in acco
34、rdance with Test Method D2122.6.4 Oxidative Stability in Potable Chlorinated WaterApplicationsFittings component(s) being tested for chlorineresistance shall not fail when tested in accordance with 8.4.6.5 DensityWhen determined in accordance with 8.5, thePEX fitting body shall have a minimum densit
35、y of 926 kg/m3.6.6 Degree of CrosslinkingWhen tested in accordancewith 8.6, the degree of crosslinking for the PEX body shall bewithin the range from 60 to 89% inclusive.6.7 Water-hammerFitting assemblies shall not pull-out orleak when tested in accordance with 8.7.6.8 Pull-outFitting assemblies sha
36、ll not pull-out or leakwhen tested in accordance with 8.8.6.9 BendingFitting assemblies shall not leak when testedin accordance with 8.96.10 O-rings:6.10.1 Effect of Aqueous Solution of ChloramineWhentested in accordance with 8.10, the o-rings shall have amaximum change in volume of 30% and a maximu
37、m change inhardness of 6.6.10.2 Compression SetWhen tested in accordance with8.11, the compression set shall not exceed the values in Table1.7. Dimensions7.1 Dimensions and TolerancesThe minimum dimen-sions of the fitting shall be as shown in Table 2. All otherdimensions and tolerances shall be dete
38、rmined by the manu-facturer. The dimensions and tolerances of the fittings andstiffeners covered by this specification must be such thatmechanical joining is possible to outside diameter (OD)controlled Specification F876 PEX tubing such that the jointswill satisfy the performance requirements in Sec
39、tion 6.8. Test Methods8.1 GeneralUnless otherwise stated, test each size offitting. If the fitting end design is the same for elbows, tees,caps and transition fittings, one such design need only beevaluated, with preference to straight connectors.8.2 ConditioningCondition test specimens at 73.4 63.6
40、F (23 6 2C) for not less than 40 h for specimens 7 mm orunder in thickness and not less than 88 h for specimens over 7mm prior to test in accordance with Practice D618, for thosetests where conditioning is required.8.3 Test ConditionsConduct the tests in the standardlaboratory atmosphere of 73.4 6 3
41、.6F (23 6 2C), unlessotherwise specified in the test methods or in this specification.8.4 Oxidative Stability in Potable Chlorinated WaterApplicationsThe test shall be conducted in accordance withthe test conditions in Sections 6 through 12 of Test MethodF2023.8.4.1 ProcedureSelect at least six fitt
42、ings from randomlyselected specimens and assemble each fitting per the fittingmanufacturers written installation instructions with a mini-mum of 6 in. length of PEX tubing between fittings. Testingshall be performed with12 in. straight connectors.8.4.1.1 Test each assembly at 239F (115C) and 60 psig
43、(4.14 bar).8.4.1.2 Test the assemblies for 3000 h. If the PEX tubingfails outside the area of the tube gripper prior to 3000 h, replacethe PEX tubing specimen and continue testing of the assembly.Any loss of fluid from the wetted component(s) or failure of thePEX tubing at the tube gripper constitut
44、es a failure. Failure ofnon-wetted components of the fitting does not constitute afailure of the test. The failed component shall be replaced andthe test continued.8.4.1.3 Once each assembly has reached 3000 h, test thefitting at 73F and 180F in accordance with Test MethodD1599, Procedure B and the
45、Hydrostatic Burst Requirementsof Specification F877. Three fittings shall be tested at eachtemperature. Testing shall be performed with untested PEXtubing. The tested assemblies shall meet the minimum hydro-static burst requirements of Specification F877.8.5 DensityDetermine the density of the fitti
46、ng PEXcompound in accordance with Test Method D1505 or TestMethod D792. Sample from the fitting wall without remolding.Perform the test in triplicate from a single fitting.8.6 Degree of CrosslinkingPlace a fitting sample in alathe with automatic feeding. Shave a strip that consists of thefull wall t
47、hickness. The strip thickness shall be approximately0.004 in. (0.1 mm) which is obtained by setting the lathefeeding accordingly. Test the specimens in accordance withTest Methods D2765 Method B, with the only deviation: testspecimen preparation. For the purpose of this specification,degree of cross
48、linking (V) is defined as 100 % minus extractpercent equals V. Perform the test in duplicate from a singlefitting.NOTE 2This method provides a test method for measuring the averagedegree of crosslinking over the fitting wall thickness. That, however, doesnot mean that the degree of crosslinking is a
49、llowed to vary outside thelimits for the grade in question at any part of the fitting. In case ofdisagreement, strips of the same thickness, 0.004 in. (0.1 mm), can betaken in tangential, axial, or radial direction at any angle section or wallthickness depth, or both, etc. to measure the degree of crosslinking.TABLE 1 Compression Set Maximum %O-ring Cross-SectionmmMaximumCompression Set%3.0to4.0 40$ 4.0 35TABLE 2 Fitting DimensionsSize, in. Minimum Wall thickness (A),in.AMinimum Inner Diameter (B),in.A12 0.140 0.49034 0.195 0.
