1、Designation: F2854 10An American National StandardStandard 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 y
2、ear oforiginal 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(PE
3、X) push-fit 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 and commer-cial, hot and cold, potable water distribution systems as well as
4、hydronic heating, including under-floor heating systems, up toand including 100 psig (6.90 bar) and 180F (82C). Includedare the requirements for materials, workmanship, dimensions,performance, and markings to be used on the fittings.1.2 The values stated in inch-pound units are to be regardedas stan
5、dard. The values 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 th
6、ose in tables and 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
7、and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A269 Specification for Seamless and Welded AusteniticStainless Steel Tubing for General ServiceA276 Specification for Stainless Steel Bars and ShapesA312/A312M Specification for Seamles
8、s, 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 Hardwa
9、re Bronze) Rod, Bar, and ShapesB283 Specification for Copper and Copper-Alloy Die Forg-ings (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 Plast
10、ics 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 Term
11、inology for Abbreviated Terms Relating toPlasticsD2000 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 Plast
12、icsD6284 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)TubingF877 Specification for Crosslinked Pol
13、yethylene (PEX)Plastic Hot- and Cold-Water Distribution SystemsF2023 Test Method for Evaluating the Oxidative Resistanceof Crosslinked Polyethylene (PEX) Tubing and Systems toHot Chlorinated Water2.2 PPI Standards:3PPI TR-3 Policies and Procedures for Developing Hydro-static Design Basis (HDB), Pres
14、sure Design Basis (PDB),1This 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 Dec. 1, 2010. Published January 2011. DOI: 10.1520/F2854.2For referenced ASTM standards, v
15、isit 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.3Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,Irving, TX 75062, h
16、ttp:/www.plasticpipe.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Strength Design Basis (SDB), and Minimum RequiredStrength (MRS) Ratings for Thermoplastic Piping Mate-rials or Pipe2.3 NSF Standard:4NSF Standard No. 14 for Pla
17、stic Piping Components andRelated Materials2.4 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
18、 Plastics piping and ducting systems - Determi-nation of the long-term hydrostatic strength of thermo-plastics materials in pipe form by extrapolation3. Terminology3.1 Definitions are in accordance with Terminology F412and abbreviations are in accordance with Terminology D1600,unless otherwise indic
19、ated.3.2 Definitions of Terms Specific to This Standard:3.3 push-fit fittingA type of fitting that joins pipes that arenot caulked, threaded, soldered, cemented, brazed or welded.These joints consist of elastomeric seals and tube grippers.Such joints must be installed in accordance to the manufactur
20、-ers instructions.4. Classification4.1 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 fo
21、r elevatedtemperature pressure service.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 fittin
22、g performance requirements ofthis specification. Those qualifying characteristics include, but are notlimited to, an established hydrostatic design basis (HDB) or stress designbasis (SDB) in accordance with PPI TR-3,oranISO 9080 compliantminimum required stress (MRS), or similar rating.5.2 Tubular S
23、tiffenerIf required by the manufacturer, 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
24、from material meeting the requirements of SpecificationB371/B371M copper alloy UNS No. C69300, SpecificationB140/B140M copper alloy UNS No. C31400, SpecificationB283 copper alloy UNS No. C37700, Specification B16/B16Mcopper-alloy UNS C36000 or copper alloy UNS C38500 orDIN 17660 CuZn39Pb3, Standard
25、EN 12168 copper AlloyCW614N, Standard EN 12164 copper Alloy CW614N orcopper alloy UNS No. C35330, or Standard EN 12165 copperAlloy CW617N.5.2.2 Machined Stainless SteelMachined stainless steelstiffeners shall be made from material meeting the require-ments of Specification A312/A312M stainless steel
26、 alloy 304,304L, 316 or 316L, (UNS Nos. S30400, S30403, S31600 orS31603), Specification A269 stainless steel alloy 304, 304L,316, 316L (UNS Nos. S30400, S30403, S31600 or S31603),Specification A276 stainless steel alloy 304, 401L, 316, or316L (UNS Nos. S30400, S30403, S31600 or S31603), orSpecificat
27、ion A351/A351M stainless steel UNS No. 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 w
28、ith a minimum tensile 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 forcont
29、act with potable 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, a
30、ll performance 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 fitt
31、ing manufactur-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.6.3 DimensionsAny randomly selected fitting or fittin
32、gsshall be used to determine dimensions. Measurements shall bemade in accordance 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 determin
33、ed in accordance with 8.5, thePEX fitting body shall have a minimum density 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.4Available from NSF International, P.O. Box 130140, 789
34、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.6Available from International Organization for Standardization (ISO), 1, ch. dela Voie-Creuse, Case postale 56, C
35、H-1211, Geneva 20, Switzerland, http:/www.iso.ch.F2854 1026.7 Water-hammerFitting assemblies shall not pull-out orleak when tested in accordance with 8.7.6.8 Pull-outFitting assemblies shall not pull-out or leakwhen tested in accordance with 8.8.6.9 BendingFitting assemblies shall not leak when test
36、edin 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 maximum change inhardness of 6.6.10.2 Compression SetWhen tested in accordance with8.11, the compression set shall not
37、 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 determined by the manu-facturer. The dimensions and tolerances of the fittings andstiffeners covered by this specifi
38、cation 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 Section 6.8. Test Methods8.1 GeneralUnless otherwise stated, test each size offitting. If the fitting end design is
39、 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 63.6F (23 6 2C) for not less than 40 h for specimens 7 mm orunder in thickness and not less than 88 h for specimens
40、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 3.6F (23 6 2C), unlessotherwise specified in the test methods or in this specification.8.4 Oxidative Stability in
41、 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 fittings from randomlyselected specimens and assemble each fitting per the fittingmanufacturers written installation
42、 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(4.14 bar).8.4.1.2 Test the assemblies for 3000 h. If the PEX tubingfails outside the area of the tube gripper p
43、rior 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 constitutes a failure. Failure ofnon-wetted components of the fitting does not constitute afailure of the test. The faile
44、d 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 Hydrostatic Burst Requirementsof Specification F877. Three fittings shall be tested at eachtemperature. Testing
45、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 fitting PEXcompound in accordance with Test Method D1505 or TestMethod D792. Sample from the fitting wall without rem
46、olding.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 thickness. The strip thickness shall be approximately0.004 in. (0.1 mm) which is obtained by setting the lathefee
47、ding 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 crosslinking (V) is defined as 100 % minus extractpercent equals V. Perform the test in duplicate from a singlefittin
48、g.NOTE 2This method provides a test method for measuring theaverage degree of crosslinking over the fitting wall thickness. That,however, does not mean that the degree of crosslinking is allowed to varyoutside the limits for the grade in question at any part of the fitting. In caseof disagreement, s
49、trips 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.8.7 Water-hammerSelect one randomly selected fittingand assemble per the fitting manufacturers written installationinstructions with lengths of PEX tubing a minimum of 12 in.long.8.7.1 Hydrostatically pressurize the fitting assembly to 15 65 psig (1.03 6 0.34 bar).8.7.2 Increase the pressure in the system within 0.01 60.005 seconds
