1、Designation: F 2735 09An 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 F 2735; the number immediately following the designati
2、on 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 specification establishes req
3、uirements for sulfoneplastic 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 operati
4、ng at temperaturesup to and 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 give
5、n in parentheses aremathematical 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 po
6、rtions, Sections 11 and 12, 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 regulato
7、rylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1600 Terminology for Abbreviated Terms Relating toPlasticsD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD6394 Specification for Sulfone Plastics (SP)F412 Terminology Relating to Plastic Piping Sy
8、stemsF876 Specification for Crosslinked Polyethylene (PEX)TubingF877 Specification for Crosslinked Polyethylene (PEX)Plastic Hot- and Cold-Water Distribution SystemsF1498 Specification for Taper Pipe Threads 60 for Ther-moplastic Pipe and FittingsF1807 Specification for Metal Insert Fittings Utilizi
9、ng aCopper Crimp Ring for SDR9 Cross-linked Polyethylene(PEX) TubingF2623 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 Rel
10、ated MaterialsNSF/ANSI Standard No. 61 for Drinking Water SystemComponents-Health Effects3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F412 and abbreviations are in accordance with Termi-nology D1600, unless otherwise indicated.4. Classification4.1 This specification g
11、overns one class of fittings andcopper crimp rings suitable for use with nominal size12 ,34 ,and 1 size PEX tubing that meets the requirements of Speci-fications F876 and polyethylene of raised temperature (PE-RT)tubing that meets the requirements of Specification F2623.5. Ordering Information5.1 Ma
12、terialMaterialFittings shall be molded fromsulfone plastic (SP) as specified in Specification D6394. The1This 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 Dec. 1, 2009
13、. Published January 2010. Originallyapproved in 2008. Last previous edition approved in 2008 as F273508.DOI:10.1520/F273509.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, r
14、efer to the standards Document 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., AnnArbo
15、r, MI 48113-0140, http:/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.material shall be polyphenylsulfone (group 03, class 1, grade 1or 2) or unreinforce
16、d polyphenylsulfone/polysulfone blends(group 04, Class 2, grade 1) or reworked plastic in accordancewith 5.1.1. Colored products can exceed the maximum specificgravity listed provided that they comply with all other proper-ties listed in Specification D6394 Table SP.5.1.1 Since fittings specified by
17、 this standard will be used inhot-and-cold water plumbing systems, 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 characteristi
18、cs include, but are not limited to,an established hydrostatic 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 t
19、his specification.5.1.2 Rework MaterialClean rework material 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 ar
20、atio exceeding 25 %.5.2 Potable Water RequirementsProducts 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 b
21、y the regu-latory authority having jurisdiction.5.3 Crimp RingsCrimp rings shall be manufactured andmarked in accordance with the requirements of SpecificationF1807.6. Molded Part Properties6.1 Insert CrushThe fitting insert shall not crack, split, orshatter when tested in accordance with 12.1.6.2 S
22、playThe molded part shall be free of visible splayexcepting 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 dimensionalr
23、equirements of this standard. PEX tubing shall meet therequirements of Specification F876. 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 F877 constitutea part of thi
24、s 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 with a title identical to thatreferenced in 7.2 appears in this specification, it containsa
25、dditional requirements that supplement those appearing inSpecification F877.ABALBH W G T R MaximumFlashand MismatchSize(in.)OutsideDiameterMinimumIDInsertLengthMinimumRib HeightNumberof RibsCRib WidthTypeGap WidthTypeMinimumWallDMinimumRadiusTotal onCrestDiameterEF12 0.471 6 .004 0.315 0.480 6 .004
26、0.011 2 0.02- 0.04 0.1146.004 0.059 0.03 0.00534 0.667 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, intersect
27、ing and minimum ID of the other fitting.BFitting shall 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 ar
28、ea.EThe maximum flash and mismatch at the root diameter 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
29、for a graphic definition of flash and mismatch created by imperfection in die half interfaces.FIG. 1 Fitting Insert Dimensions and TolerancesF27350928. Dimensions8.1 Dimensions and TolerancesThe dimensions and tol-erances of fittings shall be as shown in Fig. 1, when measuredin accordance with 11.18
30、.1.1 AlignmentThe maximum angular variation of anyopening 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 F1498.8.1.3 Straight ThreadsStraight pipe threads, intended forthe makin
31、g 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 B1.20.1.9. Workmanship, Finish and Appearance9.1 The sealing surfaces of the insert shall be smooth andfree of foreign material. The f
32、itting walls shall be free ofcracks, holes, blisters, 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 r
33、equirements for the insert shall be in accordancewith 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. I
34、nsert fittingsand crimp rings shall meet the dimensional and materialrequirements of this standard. PEX tubing shall meet therequirements of Specifications F876. The dimensions andout-of-roundness of the crimp ring after it has been crimpedshall be in accordance with Table 1.10.1.1 Crimping Procedur
35、eTo affix the insert fitting to thetubing with the 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 b
36、e positioned on the tubing so the edge of the crimpring 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 thec
37、rimping tool shall be closed around the crimp ring, 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
38、selected fitting or fittingsand crimp ring or crimp rings shall be used to determinedimensions. Measurements shall be made in accordance withTest Method D2122. Determine the diameters by makingmeasurements at four locations spaced at approximately 45apart around the circumference.12. Molded Part Pro
39、perties Test Methods12.1 Insert Crush Test Under 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 i
40、nsertuntil the opposing inside walls of the insert 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 agr
41、eed upon between the purchaser and the seller. Failure inthe retest is cause for rejection of the shipment.14. Quality Assurance14.1 When the product or product packing is marked withtheASTM designation F2735, the manufacturer affirms that theaFlash and Mismatch Created byImperfection in Die Half In
42、terfacesbTotal Flash and MismatchFIG. 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
43、 1.175 (29.8) 1.190 (30.2)AFor 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).F2735093produc
44、t was manufactured, inspected, sampled, and tested inaccordance with this specification and has been found to meetthe 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 an
45、d inspection.15.2 Content of Marking:15.2.1 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 causecra
46、cks or reduce the wall thickness below the minimumspecified.15.2.2 Marking on packaging shall include manufacturersname, fitting size, and ASTM F2735.16. Keywords16.1 cold- and hot-water distribution; copper crimp rings;cross-linked polyethylene; plastic insert fittings; PEX; PE-RTAPPENDIX(Nonmandat
47、ory Information)X1. GO/NO-GO CRIMP GAUGEX1.1 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.
48、Gages shown here provide only areference for 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
49、that crimps checked withthese gages will not 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 th
