1、Designation: F2767 09 F2767 12 An American National StandardStandard Specification forElectrofusion Type Polyamide-12 Fittings for OutsideDiameter Controlled Polyamide-12 Pipe and Tubing for GasDistribution1This standard is issued under the fixed designation F2767; the number immediately following t
2、he 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 Scope*1.1 This specificati
3、on covers polyamide- 12 electrofusion fittings for use with outside diameter-controlled polyamide- 12 pipe,covered by Specification D2513F2785. Requirements for materials, workmanship, and testing performance are included. Whereapplicable in this specification “pipe” shall mean “pipe” or “tubing.”1.
4、2 Polyamide 12 electrofusion fittings are intended for use in polyamide 12 systems only. As per the manufacturersrecommendations, no cross fusion between PA12, PA11 and PE is permitted.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathe
5、maticalconversions to SI units that are provided for information only and are not considered standard.1.4 The following safety hazards caveat pertains only to the test method portion, Section 9, of this specification:This standarddoes not purport to address all of the safety concerns, if any, associ
6、ated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D638 Test Method for Tensile Properties of PlasticsD1598 Test
7、 Method for Time-to-Failure of Plastic Pipe Under Constant Internal PressureD1599 Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and FittingsD1600 Terminology for Abbreviated Terms Relating to PlasticsD2122 Test Method for Determining Dimensions of Thermoplastic
8、 Pipe and FittingsD2513 Specification for Polyethylene (PE) Gas Pressure Pipe, Tubing, and FittingsD4066 Classification System for Nylon Injection and Extrusion Materials (PA) (Withdrawn 2012)3D6779 Classification System for and Basis of Specification for Polyamide Molding and Extrusion Materials (P
9、A)F412 Terminology Relating to Plastic Piping SystemsF905 Practice for Qualification of Polyethylene Saddle-Fused JointsF2785 Specification for Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings3. Terminology3.1 Definitions are in accordance with Terminology F412, and abbreviations are in accordan
10、ce with Terminology D1600, unlessotherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 electrofusiona heat fusion joining process where the heat source is an integral part of the fitting, such that when electriccurrent is applied, heat is produced that melts and joins the plas
11、tics.3.2.2 fusion interfacesurface in the heat fusion process where the plastic materials of the products being joined bond together.3.2.3 fusion zone lengthtotal length of the melted material in the fitting cross-section under evaluation.1 This specification is under the jurisdiction of ASTM Commit
12、tee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.Current edition approved April 1, 2009Oct. 15, 2012. Published May 2009December 2012. Originally approve in 2009. Last previous edition appeoved in 2009 asF276709. DOI: 10.1520/F2767-09.10.1520/F2767-12.
13、2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last approved version of this historical standard is
14、 referenced on www.astm.org.This document 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
15、that users consult prior editions as appropriate. 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, Wes
16、t Conshohocken, PA 19428-2959. United States14. Materials and Manufacture4.1 This specification covers fittings made from polyamide 12 (PA12) meeting the requirements for Group 4, Class 2, and Grade3, (PA423 16) as prescribed in Specification D6779 and D4066.4.2 Rework MaterialClean rework polyamide
17、- 12 material of the same resin, free of any wire or contaminants generated fromthe fitting manufacturers own production, may be used by the same manufacturer, as long as the fittings produced conform to therequirements of this specification.4.3 Heating MechanismThe heat mechanism shall be of materi
18、als not detrimental to the performance of the fitting or the pipeto which it is intended to be joined.5. Performance Requirements5.1 The following requirements are for electrofusion joints that have been joined using the manufacturers recommended joiningprocedures. These requirements must be met by
19、each electrofusion joint design, on each size and type of pipe material for whichthe manufacturer recommends use of their fitting. Any revisions to the electrofusion joint design or processing by the manufacturerafter the initial testing requires retesting to ensure these requirements can still be m
20、et. Fittings intended for use in the distributionof natural gas or liquid petroleum gas shall also meet the requirements of Specification D2513F2785.5.1.1 It is not required that each configuration of a fitting be tested to meet all of these qualifications (that is, 2 in. main saddlejoint with multi
21、ple outlet configurations offered) as long as the electrofusion joint design is not altered in the configurationdifferences.NOTE 1It is permissible when accomplishing these tests, to do so on the highest and lowest dimension ratio of the same pipe material. If in thosetests all performance requireme
22、nts are met, all dimension ratios between those tested may be considered as having met the requirements. These tests donot have to cover the full range of dimension ratios available, only the dimension ratio range on which the manufacturer recommends his fitting be used.5.2 Pressure Requirements:5.2
23、.1 Minimum Hydraulic Burst PressureThe minimum hydraulic burst pressure of the test specimen shall not be less thanthat required to produce 3900psi (26.9MPa) fiber stress in the pipe being used in the test when tested in accordance with 9.1. Thetest equipment, procedures, and failures definitions sh
24、all be as specified in Test Method D1599.5.2.2 Sustained PressureThe fitting and fused joint shall not fail when tested in accordance with 9.2.5.3 Tensile Strength Requirements (Coupling Type Joints Only)The fitting or the pipe to fitting joint made on pipe shall notfail when tested in accordance wi
25、th 9.3. Specimens shall be subjected to a tensile stress that causes the pipe to yield or causes thepipe to break outside the joint area. Tensile tests must be made on specimens as joined, not on straps cut from the specimen.Yielding must be measured only in the pipe, independent of the fitting or j
26、oint.5.4 Impact Resistance (Saddle Type Joints Only)The joint made on the specimen shall not fail when impacted with a forcesufficient to break the body or other portion of the specimen. Tests of 500 ft-lb or higher impact with no failures noted shall beconsidered as a “pass” impact test. The device
27、 for testing and the methods shall be as defined in Practice F905.5.5 Joint Integrity Tests(Couplings and Saddle Type Joints)The joint made on the specimen shall meet the requirements in9.4 and 9.5 of this specification, when tested in accordance with 9.4.6. Dimensions, Mass, and Permissible Variati
28、ons6.1 Dimension and tolerances of electrofusion fittings must be such that heat fusion is possible to outside diameter (OD)controlled PA-12 pipes such as those listed in SpecificationsSpecification D2513F2785, such that the joints will satisfy theperformance requirements in Section 5. (See Test Met
29、hod D2122.)6.2 Because of the varying designs for electrofusion fittings, the actual spread of dimensions may be quite different frommanufacturer to manufacturer. A table of dimensions and tolerances encompassing these differences would be meaningless andwithout value and, therefore, is omitted from
30、 this specification.6.3 The manufacturer shall furnish to the user the electrical resistance, critical dimensions, and tolerances of his fittings. Thisinformation must include at least the following dimensions and tolerances:6.3.1 Coupling inside diameter,6.3.2 Temperature joining limits, and6.3.3 O
31、perating pressure of the fitting.NOTE 2There are other items that fall beyond the scope of this specification which would be of interest to the user for proper application of the fittingsand is recommended as additional information to be furnished. A few of these are: (1) maximum pipe out of round a
32、llowed at joint area; (2)minimum/maximum pipe SDR capability of the fitting, and (3) for saddles intended for use on a live main, the maximum allowable line pressure whenmaking the joint.7. Workmanship, Finish and Appearance7.1 The manufacture of these fittings shall be in accordance with good comme
33、rcial practice so as to produce fittings meetingthe requirements of this specification.F2767 1227.2 The fittings shall be homogeneous throughout, except where a heating coil or electrical connectors are incorporated, and freeof cracks, holes, foreign inclusions, or injurious defects such as gouges,
34、dents, cuts, etc. The fittings shall be as uniform ascommercially practicable in opacity, density, and other physical properties. Any heating coils, connecting cables, connectors, andrelated electrical power source shall be designed to prevent electrical shock to the user.8. Specimen Preparation8.1
35、Conditioning:8.1.1 Unless otherwise specified, condition the specimens (pipe and fittings) prior to joining at the minimum pipe temperatureallowable for fusion as recommended by the manufacturer, for not less than 16 h and make the fusion joint at that temperature forthose tests where conditioning i
36、s required.8.1.2 Unless otherwise specified, condition the specimens (pipe and fittings) prior to joining at the maximum pipe temperatureallowable for fusion as recommended by the manufacturer, for not less than 16 h and make the fusion joint at that temperature forthose tests where conditioning is
37、required.8.2 Test ConditionsConduct the tests at the Standard Laboratory Temperature of 23.6 6 2C (73.4 6 3.6F) unless otherwisespecified.8.3 Preparation of Specimens for Testing:8.3.1 Prepare test specimens so that the minimum length of unreinforced pipe on one side of any fitting is equal to three
38、 timesthe diameter of the pipe, but in no case less than 12 in. (304 mm). It is permissible to test multiple fittings together provided theyare separated by a minimum distance equal to three times the diameter of the pipe, but in no case less than 12 in. (304 mm).8.3.2 Fuse all fitting outlets with
39、the appropriate size pipe in accordance with the manufacturers recommended procedures.8.3.3 All saddle fusion joint specimens conditioned as in 8.1.2 and destined for quick burst testing as in 9.1 and sustainedpressure testing as in 9.2, are to be joined with the pipe at no less than maximum allowab
40、le operating pressure of the pipe systemor fitting, whichever is lowest, when being prepared for those tests. The pipe should be left under pressure for a time period notless than recommended by the manufacturer for cooling in the field prior to disturbing the joint. Saddle joint specimens destinedf
41、or mechanical/destructive type tests such as impact as in 5.4 or crush tests as in 9.4, or specimens conditioned for cold temperaturejoining as in 8.1.1, may be made on unpressured pipe specimens.9. Test Methods9.1 Minimum Hydraulic Burst Pressure Test:9.1.1 Select four fittings at random and prepar
42、e specimens in accordance with Section 8. From the four specimens, conditiontwo specimens each in accordance with 8.1.1 and 8.1.2.9.1.2 Test the specimens in accordance with Test Method D1599.9.1.3 Failure of the fitting or joint shall constitute specimen failure.9.1.4 Failure of any one of the four
43、 specimens shall constitute failure of the test. Failure of one of the four specimens testedis cause for retest of four additional specimens, joined at the failed specimens joining temperature. Failure of any of these fouradditional specimens constitutes a failure of the test.9.2 Sustained Pressure
44、Test:9.2.1 Select four fittings at random and prepare specimens in accordance with Section 8 of this specification. From the fourspecimens, condition two specimens each in accordance with 8.1.1 and 8.1.2.9.2.2 Test the specimens in accordance with Test Method D1598. All tests shall be conducted at 8
45、0 6 2C. The assemblies areto be subjected to pipe fiber stresses of 1850 psi (12.8 MPa) for 170 h. Joint specimens shall not fail within these time periods.Any failures within these time periods must be of the pipe, independent of the fitting or joint and must be of a “brittle” type pipefailure, not
46、 “ductile.” If ductile pipe failures occur, reduce the pressure of the test and repeat until 170-h results or pipe brittlefailures are achieved.9.2.3 Failure of the fitting or joint shall constitute specimen failure.9.2.4 Failure of one of the four specimens tested is cause for retest of four additi
47、onal specimens, joined at thefailed-specimens-joining temperature. Failure of any of these four additional specimens shall constitute a failure of the test.9.3 Tensile Strength Test:Tensile Strength Test:9.3.1 Select four fittings at random and prepare specimens in accordance with Section 8. If the
48、limits of tensile machine willnot allow 25 % elongation with pipe specimens of three-pipe diameters on pipe sizes above 4 in. (102 mm) IPS than the minimumfree pipe length can of 20 in. (304 mm). From the four specimens, condition two specimens each in accordance with 8.1.1 and8.1.2.9.3.2 Test the s
49、pecimens using the apparatus of Test Method D638. Test at a pull rate of 0.20 in. (5.0 mm) per min, 625 %.9.3.3 Failure of the fitting or joint as defined in 5.3, shall constitute specimen failure. Failure of one of the four specimens testedis cause for retest of four additional specimens, joined at the failed specimens joining temperature. Failure of any of these fouradditional specimens shall constitute a failure of the test.F2767 1239.4 Joint Integrity TestsJoint Integrity TestsIllustrations Illustrations of joint crush tests for socket type joints and s
