1、Designation: F2735 09 (Reapproved 2016)F2735 18 An American National StandardStandard Specification forPlastic Insert Fittings For SDR9 Cross-linked Polyethylene(PEX) and Polyethylene of Raised Temperature (PE-RT)Tubing1This standard is issued under the fixed designation F2735; the number immediatel
2、y following the designation indicates the year 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. Scope*1.1 This spec
3、ification establishes requirements for sulfone plastic insert fittings and copper crimp rings for three sizes(12, 34, and 1) of cross-linked polyethylene (PEX) tubing that meet the requirements for Specification F876 or F3253, andpolyethylene of raised temperature (PE-RT) plastic tubing. tubing that
4、 meet the requirements of Specification F2623. These fittingsare intended for use in 100 psi (690 kPa) cold- and hot-water distribution systems operating at temperatures up to and including180F (82C).180 F (82 C). Included are the requirements for material, molded part properties, performance, workm
5、anship,dimensions, and markings to be used on the fittings and rings.1.2 UnitsThe values stated in inch-pound units are to be regarded as standard. The values given in parentheses aremathematical conversions to SI units that are provided for information only and are not considered standard.1.3 The f
6、ollowing is an index of the appendix in this specification.GO/NO-GO Crimp Gauges Appendix X11.4 The following precautionary caveat pertains only to the test method portions, Sections 11 and 12, of this specification.Thisstandard does not purport to address all of the safety concerns, if any, associa
7、ted with its use. It is the responsibility of the userof this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the applicabilityof regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationa
8、lly recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D1600 Terminol
9、ogy for Abbreviated Terms Relating to PlasticsD2122 Test Method for Determining Dimensions of Thermoplastic Pipe and FittingsD6394 Specification for Sulfone Plastics (SP)F412 Terminology Relating to Plastic Piping SystemsF876 Specification for Crosslinked Polyethylene (PEX) TubingF877 Specification
10、for Crosslinked Polyethylene (PEX) Hot- and Cold-Water Distribution SystemsF1498 Specification for Taper Pipe Threads 60 for Thermoplastic Pipe and FittingsF1807 Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubingand SDR9 Polyethylene
11、 of Raised Temperature (PE-RT) TubingF2623 Specification for Polyethylene of Raised Temperature (PE-RT) SDR 9 TubingF3253 Specification for Crosslinked Polyethylene (PEX) Tubing with Oxygen Barrier for Hot- and Cold-Water HydronicDistribution Systems1 This test method specification is under the juri
12、sdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.10 onFittings.Current edition approved April 1, 2016Nov. 1, 2018. Published May 2016December 2018. Originally approved in 2008. Last previous edition approved in 20092016 asF273509. DOI:10.1
13、520/F273509R16.F273509(2016). DOI:10.1520/F273518.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This docume
14、nt is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as ap
15、propriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United S
16、tates12.2 ASME Standard:3B1.20.1 Pipe Threads General Purpose Inch2.3 NSF International Standard4NSF/ANSI Standard No, 14 for Plastic Piping Components and Related MaterialsNSF/ANSI Standard No. 61 for Drinking Water System Components-Health Effects3. Terminology3.1 DefinitionsDefinitions are in acc
17、ordance with Terminology F412 and abbreviations are in accordance with TerminologyD1600, unless otherwise indicated.4. Classification4.1 This specification governs one class of fittings and copper crimp rings suitable for use with nominal size 12, 34, and 1 sizePEX tubing that meets the requirements
18、 of SpecificationsSpecification F876 or F3253 and polyethylene of raised temperature(PE-RT) tubing that meets the requirements of Specification F2623.5. Ordering Information5.1 MaterialMaterialFittings shall be molded from sulfone plastic (SP) as specified in Specification D6394. The materialshall b
19、e polyphenylsulfone (group 03, class 1, grade 1 or 2) or unreinforced polyphenylsulfone/polysulfone blends (group 04, Class2, grade 1) or reworked plastic in accordance with 5.1.1. Colored products can exceed the maximum specific gravity listedprovided that they comply with all other properties list
20、ed in Specification D6394 Table SP.5.1.1 Since fittings specified by this standard will be used in hot-and-cold water plumbing systems, a material used tomanufacture fittings in accordance with this specification must demonstrate qualities consistent with that application in additionto the performan
21、ce requirements of this specification. Those qualifying characteristics include, but are not limited to, an establishedhydrostatic design basis (HDB) or stress design basis (SDB) in accordance with PPI TR-3 or similar rating and a demonstrationof resistance to the long-term effects of those chemical
22、s normally found in potable water at the maximum temperature stated inthis specification.5.1.2 Rework MaterialClean rework material of the same commercial designation, generated from the manufacturers ownproduction may be used by the same manufacturer, provided the fittings meet all of the requireme
23、nts of this specification.Reworked material shall not be introduced at a ratio exceeding 25 %.5.2 Potable Water RequirementsProducts intended for the transport of potable water shall be evaluated, tested and certifiedfor conformance with NSF/ANSI Standard No. 61 or the health effects portion of NSF/
24、ANSI Standard No. 14 by an acceptablecertifying organization when required by the regulatory authority having jurisdiction.5.3 Crimp RingsCrimp rings shall be manufactured and marked in accordance with the requirements of Specification F1807.6. Molded Part Properties6.1 Insert CrushThe fitting inser
25、t shall not crack, split, or shatter when tested in accordance with 12.1.6.2 SplayThe molded part shall be free of visible splay excepting some slight blushing at the gate location.7. Performance Requirements7.1 GeneralAll performance tests shall be performed on assemblies of fittings, crimp rings,
26、and PEX tubing. Fittings andcrimp rings shall meet the material and dimensional requirements of this standard. PEX tubing shall meet the requirements ofSpecification F876 or F3253. Assembly of test specimens shall be in accordance with Section 10. Use separate sets of assembliesfor each performance
27、test requirement.7.2 The following sections of Specification F877 constitute a part of this specification:7.2.1 Hydrostatic Burst,7.2.2 Hydrostatic Sustained Pressure Strength,7.2.3 Thermocycling,7.2.4 Excessive Temperature-Pressure Capability, and7.2.5 Test Methods.7.3 In addition, when a section w
28、ith a title identical to that referenced in 7.2 appears in this specification, it contains additionalrequirements that supplement those appearing in Specification F877.3 Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, ThreeTwo Park Ave., New York, NY
29、10016-5990,http:/www.asme.org.4 Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., Ann Arbor, MI 48113-0140, http:/www.nsf.org.F2735 1828. Dimensions8.1 Dimensions and TolerancesThe dimensions and tolerances of fittings shall be as shown in Fig. 1, when measured inaccordance with
30、 11.18.1.1 AlignmentThe maximum angular variation of any opening shall not exceed 1 off the true centerline axis.8.1.2 Tapered ThreadsFitting threads shall be American National Standard Taper Pipe Thread Form conforming toSpecification F1498.8.1.3 Straight ThreadsStraight pipe threads, intended for
31、the making of a gasketed seal with taper pipe threads, shall beAmerican National Straight Pipe Thread for Fixtures (free-fitting mechanical joints), NPSM, and conform to ASME B 1.20.1.9. Workmanship, Finish, and Appearance9.1 The sealing surfaces of the insert shall be smooth and free of foreign mat
32、erial.The fitting walls shall be free of cracks, holes,blisters, voids, foreign inclusions, or other defects that are visible to the unaided eye and that affect the wall integrity.9.2 Except for the insert, the molded part shall be free of flash in excess of 0.005 in. (0.13 mm). Flash, mismatch, and
33、 witnessmark requirements for the insert shall be in accordance with Fig. 1.10. Assembly10.1 Crimp JointsInsert fittings shall be joined to PEX tubing by the compression of a copper crimp ring around the outercircumference of the tubing forcing the tubing material into annular spaces formed by ribs
34、on the fitting. Insert fittings and crimprings shall meet the dimensional and material requirements of this standard. PEX tubing shall meet the requirements ofSpecificationsSpecification F876 or F3253. The dimensions and out-of-roundness of the crimp ring after it has been crimped shallbe in accorda
35、nce with Table 1.10.1.1 Crimping ProcedureTo affix the insert fitting to the tubing with the crimp ring, the crimping procedure shall be asfollows: slide the crimp ring onto the tubing, insert the ribbed end of the fitting into the end of the tubing until the tubing contactsthe shoulder of the fitti
36、ng or tube stop. The crimp ring shall then be positioned on the tubing so the edge of the crimp ring contactsthe shoulder of the fitting or tube stop. The jaws of the crimping tool shall be centered over the crimp ring and the tool shall beheld so that the crimping jaws are approximately perpendicul
37、ar to the axis of the barb. The jaws of the crimping tool shall be closedaround the crimp ring, compressing the crimp ring onto the tubing.The crimp ring shall not be crimped more than once. Each crimpshall be checked to determine conformance to the after crimped dimensional requirements of Table 1.
38、A BA LB H W G T R MaximumFlashand MismatchSize(in.)OutsideDiameterMinimumIDInsertLengthMinimumRib HeightNumberof RibsCRib WidthTypeGap WidthTypeMinimumWallDMinimumRadiusTotal onCrestDiameterEF12 0.471 .004 0.315 0.480 .0040.011 2 0.02- 0.04 0.114.004 0.059 0.03 0.00534 0.667 .004 0.490 0.480 .0040.0
39、11 2 0.02- 0.04 0.114.004 0.067 0.03 0.0051 0.856 .004 0.645 0.480 .0040.011 2 0.02- 0.04 0.114.004 0.084 0.03 0.005AThe minimum ID shall be maintained through the insert length and into the fitting, intersecting and minimum ID of the other fitting.BFitting shall be designed with sufficient overall
40、dimensions to allow proper use of crimp tool without interference with previously completed crimps on the same fitting.CLead chamfer area is not considered rib.DApplies to entire fitting and not just insert area.EThe maximum flash and mismatch at the root diameter between the ribs may not exceed 30%
41、 of rib heightFThe total flash and mismatch is assumed to be the difference between the dimensions X and Y (See Fig. 2 a.) These dimensions may be measured with appropriatecallipers or micrometres. See Fig. 2b for a graphic definition of flash and mismatch created by imperfection in die half interfa
42、ces.FIG. 1 Fitting Insert Dimensions and TolerancesF2735 18311. Test Methods11.1 DimensionsAny randomly selected fitting or fittings and crimp ring or crimp rings shall be used to determinedimensions. Measurements shall be made in accordance with Test Method D2122. Determine the diameters by makingm
43、easurements at four locations spaced at approximately 45 apart around the circumference.12. Molded Part Properties Test Methods12.1 Insert Crush TestUnder ambient conditions, test six fittings of each size in accordance with 12.1.1.12.1.1 ProcedureUsing a bench vise or other suitable compression dev
44、ice, place the insert of the fitting between the jaws ofthe vise. Close the jaws of the vise deforming the insert until the opposing inside walls of the insert touch. The insert shall notcrack, split, or shatter, see Fig. 3. Separation of the insert from the fitting body at the shoulder shall not be
45、 considered a failure,see Fig. 4.13. Restest13.1 If any failure occurs, a retest shall be conducted only if agreed upon between the purchaser and the seller. Failure in theretest is cause for rejection of the shipment.14. Quality Assurance14.1 When the product or product packing is marked with the A
46、STM designation F2735, the manufacturer affirms that theproduct was manufactured, inspected, sampled, and tested in accordance with this specification and has been found to meet therequirements of this specification.aFlash and Mismatch Created byImperfection in Die Half InterfacesbTotal Flash and Mi
47、smatchFIG. 2 Fitting Insert Dimensions and TolerancesTABLE 1 Crimp Ring Dimensions After Crimping on Tube/FittingAssemblyNominal Tube SizeInsert EndFinal Crimped Outside DiameterA,BMinimum, in. (mm) Maximum, in. (mm)12 0.700 (17.8) 07.15 (18.2)34 0.945 (24.0) 0.960 (24.4)1 1.175 (29.8) 1.190 (30.2)A
48、For all diameters except for the area of scoring caused by the crimping tool.BThe maximum out of roundness as measured by the difference between theminimum crimped outside diameter and the maximum crimped outside diametershall not exceed 0.006 in. 90.150 mm).1 Place the insert in a vise or other sui
49、table device 2 Close the vice jaws until the inside walls touch.FIG. 3 Insert Crush TestF2735 18415. Product Marking15.1 Quality of MarkingThe marking shall be applied to the fittings in such a manner that it remains legible after installationand inspection.15.2 Content of Marking:15.2.1 Marking on fittings shall include manufacturers name or trademark, or some other identifying mark, materialdesignation, and ASTM F2735F273515.2.1.1 Where recessed marking is used on fittings, care shall be taken to see that in no case
