1、Designation: F 2735 08aStandard 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 F 2735; the number immediately following the designation indicates the year oforig
2、inal 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 specification establishes requirements for sulfoneplastic
3、 insert fittings and copper crimp rings for three sizes(12 ,34 , and 1) of cross-linked polyethylene (PEX) andpolyethylene of raised temperature (PE-RT) plastic tubing.These fittings are intended for use in 100 psi (690 kPa) cold-and hot-water distribution systems operating at temperaturesup to and
4、including 180F (82C). Included are the require-ments for material, molded part properties, performance, work-manship, dimensions, and markings to be used on the fittingsand rings.1.2 UnitsThe values stated in inch-pound units are to beregarded as standard. The values given in parentheses aremathemat
5、ical conversions to SI units that are provided forinformation only and are not considered standard.1.3 The following is an index of the appendix in thisspecification.GO/NO-GO Crimp Gauges Appendix X11.4 The following precautionary caveat pertains only to thetest method portions, Sections 11 and 12,
6、of this specification.This standard does not purport to address all of the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2
7、. Referenced Documents2.1 ASTM Standards:2D 1600 Terminology for Abbreviated Terms Relating toPlasticsD 2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD 6394 Specification for Sulfone Plastics (SP)F 412 Terminology Relating to Plastic Piping SystemsF 876 Specification
8、 for Crosslinked Polyethylene (PEX)TubingF 877 Specification for Crosslinked Polyethylene (PEX)Plastic Hot- and Cold-Water Distribution SystemsF 1498 Specification for Taper Pipe Threads 60 for Ther-moplastic Pipe and FittingsF 1807 Specification for Metal Insert Fittings Utilizing aCopper Crimp Rin
9、g for SDR9 Cross-linked Polyethylene(PEX) TubingF 2623 Specification for Polyethylene of Raised Tempera-ture (PE-RT) SDR 9 Tubing2.2 ASME Standard:3B1.20.1 Pipe Threads General Purpose Inch2.3 NSF International Standard4NSF/ANSI Standard No, 14 for Plastic Piping Componentsand Related MaterialsNSF/A
10、NSI Standard No. 61 for Drinking Water SystemComponents-Health Effects3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F 412 and abbreviations are in accordance with Termi-nology D 1600, unless otherwise indicated.4. Classification4.1 This specification governs one class
11、of fittings andcopper crimp rings suitable for use with nominal size12 ,34 ,and 1 size PEX tubing that meets the requirements of Speci-fications F 876 and polyethylene of raised temperature (PE-RT) tubing that meets the requirements of SpecificationF 2623.5. Ordering Information5.1 MaterialFittings
12、shall be molded from sulfone plastic(SP) as specified in Specification D 6394. The material shall be1This test method 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 Nov. 1, 2008. Pu
13、blished November 2008. Originallyapproved in 2008. Last previous edition approved in 2008 as F273508.2For 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 D
14、ocument Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.4Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., AnnArbor, MI 48113-0140, http:
15、/www.nsf.org.1*A Summary 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.unreinforced polyphenylsulfone (group 03, class 1, grade 2) oran unreinforced blend of polyphenylsulfone a
16、nd polysulfone(group 01, class 1, grade 2) with the polyphenylsulfonecontinuous phase comprising 55 to 80 % of the blend. Fittingsshall be made from virgin plastic or reworked plastic inaccordance with 5.1.2.5.1.1 Since fittings specified by this standard will be used inhot-and-cold water plumbing s
17、ystems, a material used tomanufacture fittings in accordance with this specification mustdemonstrate qualities consistent with that application in addi-tion to the performance requirements of this specification.Those qualifying characteristics include, but are not limited to,an established hydrostat
18、ic design basis (HDB) or stress designbasis (SDB) in accordance with PPI TR-3 or similar rating anda demonstration of resistance to the long-term effects of thosechemicals normally found in potable water at the maximumtemperature stated in this specification.5.1.2 Rework MaterialClean rework materia
19、l of the samecommercial designation, generated from the manufacturersown production may be used by the same manufacturer,provided the fittings meet all of the requirements of thisspecification. Reworked material shall not be introduced at aratio exceeding 25 %.5.2 Potable Water RequirementsProducts
20、intended for thetransport of potable water shall be evaluated, tested andcertified for conformance with NSF/ANSI Standard No. 61 orthe health effects portion of NSF/ANSI Standard No. 14 by anacceptable certifying organization when required by the regu-latory authority having jurisdiction.5.3 Crimp R
21、ingsCrimp rings shall be manufactured andmarked in accordance with the requirements of SpecificationF 1807.6. Molded Part Properties6.1 Insert CrushThe fitting insert shall not crack, split, orshatter when tested in accordance with 12.1.6.2 SplayThe molded part shall be free of visible splayexceptin
22、g some slight blushing at the gate location.7. Performance Requirements7.1 GeneralAll performance tests shall be performed onassemblies of fittings, crimp rings, and PEX tubing. Fittingsand crimp rings shall meet the material and dimensionalrequirements of this standard. PEX tubing shall meet thereq
23、uirements of Specification F 876. Assembly of test speci-mens shall be in accordance with Section 10. Use separate setsof assemblies for each performance test requirement.7.2 The following sections of Specification F 877 constitutea part of this specification:7.2.1 Hydrostatic Burst,7.2.2 Hydrostati
24、c 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 with a title identical to thatreferenced in 7.2 appears in this specification, it containsadditional requirements that supplement those appearing i
25、nSpecification F 877.ABALBH W G T R MaximumFlashand MismatchSize(in.)OutsideDiameterMinimumIDInsertLengthMinimumRib HeightNumberof RibsCRib WidthTypeGap WidthTypeMinimumWallDMinimumRadiusTotal onCrestDiameterEF12 0.471 6 .004 0.315 0.480 6 .004 0.011 2 0.02- 0.04 0.1146.004 0.059 0.03 0.00534 0.667
26、6 .004 0.490 0.480 6 .004 0.011 2 0.02- 0.04 0.1146.004 0.067 0.03 0.0051 0.856 6 .004 0.645 0.480 6 .004 0.011 2 0.02- 0.04 0.1146.004 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
27、be designed with sufficient overall 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
28、 between the ribs may not exceed 30% of rib heightFThe total flash and mismatch is assumed to be the difference between the dimensions X and Y (See Fig. 2a.) These dimensions may be measured with appropriatecallipers or micrometres. See Fig. 2b for a graphic definition of flash and mismatch created
29、by imperfection in die half interfaces.FIG. 1 Fitting Insert Dimensions and TolerancesF 2735 08a28. Dimensions8.1 Dimensions and TolerancesThe dimensions and tol-erances of fittings shall be as shown in Fig. 1, when measuredin accordance with 11.18.1.1 AlignmentThe maximum angular variation of anyop
30、ening shall not exceed 1 off the true centerline axis.8.1.2 Tapered ThreadsFitting threads shall be AmericanNational Standard Taper Pipe Thread Form conforming toSpecification F 1498.8.1.3 Straight ThreadsStraight pipe threads, intended forthe making of a gasketed seal with taper pipe threads, shall
31、 beAmerican National Straight Pipe Thread for Fixtures (free-fitting mechanical joints), NPSM, and conform to ASME B1.20.1.9. Workmanship, Finish and Appearance9.1 The sealing surfaces of the insert shall be smooth andfree of foreign material. The fitting walls shall be free ofcracks, holes, blister
32、s, voids, foreign inclusions, or otherdefects that are visible to the unaided eye and that affect thewall integrity.9.2 Except for the insert, the molded part shall be free offlash in excess of 0.005 in. (0.13 mm). Flash, mismatch, andwitness mark requirements for the insert shall be in accordancewi
33、th Fig. 1.10. Assembly10.1 Crimp JointsInsert fittings shall be joined to PEXtubing by the compression of a copper crimp ring around theouter circumference of the tubing forcing the tubing materialinto annular spaces formed by ribs on the fitting. Insert fittingsand crimp rings shall meet the dimens
34、ional and materialrequirements of this standard. PEX tubing shall meet therequirements of Specifications F 876. The dimensions andout-of-roundness of the crimp ring after it has been crimpedshall be in accordance with Table 1.10.1.1 Crimping ProcedureTo affix the insert fitting to thetubing with the
35、 crimp ring, the crimping procedure shall be asfollows: slide the crimp ring onto the tubing, insert the ribbedend of the fitting into the end of the tubing until the tubingcontacts the shoulder of the fitting or tube stop. The crimp ringshall then be positioned on the tubing so the edge of the crim
36、pring contacts the shoulder of the fitting or tube stop. The jawsof the crimping tool shall be centered over the crimp ring andthe tool shall be held so that the crimping jaws are approxi-mately perpendicular to the axis of the barb. The jaws of thecrimping tool shall be closed around the crimp ring
37、, compress-ing the crimp ring onto the tubing. The crimp ring shall not becrimped more than once. Each crimp shall be checked todetermine conformance to the after crimped dimensionalrequirements of Table 1.11. Test Methods11.1 DimensionsAny randomly selected fitting or fittingsand crimp ring or crim
38、p rings shall be used to determinedimensions. Measurements shall be made in accordance withTest Method D 2122. Determine the diameters by makingmeasurements at four locations spaced at approximately 45apart around the circumference.12. Molded Part Properties Test Methods12.1 Insert Crush Test Under
39、ambient conditions, test sixfittings of each size in accordance with 12.1.1.12.1.1 ProcedureUsing a bench vise or other suitablecompression device, place the insert of the fitting between thejaws of the vise. Close the jaws of the vise deforming the insertuntil the opposing inside walls of the inser
40、t touch. The insertshall not crack, split, or shatter, see Fig. 3. Separation of theinsert from the fitting body at the shoulder shall not beconsidered a failure, see Fig. 4.13. Restest13.1 If any failure occurs, a retest shall be conducted onlyif agreed upon between the purchaser and the seller. Fa
41、ilure inthe retest is cause for rejection of the shipment.14. Quality Assurance14.1 When the product or product packing is marked withthe ASTM designation F 2735, the manufacturer affirms thataFlash and Mismatch Created byImperfection in Die Half InterfacesbTotal Flash and MismatchFIG. 2 Fitting Ins
42、ert 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)AFor all diameters except
43、 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).F 2735 08a3the product was manufactured, inspected, sampled, and
44、testedin accordance with this specification and has been found tomeet the requirements of this specification.15. Product Marking15.1 Quality of MarkingThe marking shall be appliedto the fittings in such a manner that it remains legible afterinstallation and inspection.15.2 Content of Marking:15.2.1
45、Marking on fittings shall include manufacturersname or trademark, or some other identifying mark, materialdesignation, and ASTM F 2735.15.2.1.1 Where recessed marking is used on fittings, careshall be taken to see that in no case shall the marking causecracks or reduce the wall thickness below the m
46、inimumspecified.15.2.2 Marking on packaging shall include manufacturersname, fitting size, and ASTM F 2735.16. Keywords16.1 cold- and hot-water distribution; copper crimp rings;cross-linked polyethylene; plastic insert fittings; PEX; PE-RTAPPENDIX(Nonmandatory Information)X1. GO/NO-GO CRIMP GAUGEX1.
47、1 This appendix provides dimensions for gages to checkthe after-crimped dimensions of the three sizes of crimpconnections governed by this standard. This information hasbeen taken from gages in current production at the time of thewriting of this standard. Gages shown here provide only areference fo
48、r the maximum and minimum diameters of thecrimped ring and do not provide a check for the out-of-rounddimension. Additionally, calipers or micrometers may also beused.X1.2 Crimp gages manufactured according to the dimen-sions shown in Fig. X1.1 will ensure that crimps checked withthese gages will no
49、t be larger or smaller than those allowed bythis standard.X1.3 Use of the Crimp GO/NO-GO GageSlide thecorrect size GO section of the gage over the crimped ring in atleast two places and attempt to slide the NO-GO section of thegage over the crimped ring in at least two places (see NoteX1.1). The GO section of the gage should slide over thecrimped ring easily and the NO-GO section should not slideover the crimped ring. If the GO section does not slide over thering, or the NO-GO section slides over the ring, the crimpedjoint must be replaced.
