1、Designation: F 2767 09Standard Specification forElectrofusion Type Polyamide-12 Fittings for OutsideDiameter Controlled Polyamide-12 Pipe and Tubing for GasDistribution1This standard is issued under the fixed designation F 2767; the number immediately following the designation indicates the year ofo
2、riginal 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 polyamide- 12 electrofusionfitting
3、s for use with outside diameter-controlled polyamide- 12pipe, covered by Specification D 2513. Requirements formaterials, workmanship, and testing performance are included.Where applicable in this specification “pipe” shall mean “pipe”or “tubing.”1.2 Polyamide 12 electrofusion fittings are intended
4、for usein polyamide 12 systems only. As per the manufacturersrecommendations, no cross fusion between PA12, PA11 and PEis permitted.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for i
5、nformation onlyand are not considered standard.1.4 The following safety hazards caveat pertains only to thetest method portion, Section 9, of this specification:Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof
6、 this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2D 638 Test Method for Tensile Properties of PlasticsD 1598 Test Method for Time-to-Failure of Plastic PipeUnder Consta
7、nt Internal PressureD 1599 Test Method for Resistance to Short-Time Hydrau-lic Pressure of Plastic Pipe, Tubing, and FittingsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD 2513 Specification for Thermopla
8、stic Gas Pressure Pipe,Tubing, and FittingsD 4066 Classification System for Nylon Injection and Ex-trusion Materials (PA)D 6779 Classification System for Polyamide Molding andExtrusion Materials (PA)F 412 Terminology Relating to Plastic Piping SystemsF 905 Practice for Qualification of Polyethylene
9、Saddle-Fused Joints3. Terminology3.1 Definitions are in accordance with Terminology F 412,and abbreviations are in accordance with Terminology D 1600,unless otherwise specified.3.2 Definitions of Terms Specific to This Standard:3.3 electrofusiona heat fusion joining process where theheat source is a
10、n integral part of the fitting, such that whenelectric current is applied, heat is produced that melts and joinsthe plastics.3.4 fusion interfacesurface in the heat fusion processwhere the plastic materials of the products being joined bondtogether.3.5 fusion zone lengthtotal length of the melted ma
11、terialin the fitting cross-section under evaluation.4. Materials and Manufacture4.1 This specification covers fittings made from polyamide12 (PA12) meeting the requirements for Group 4, Class 2, andGrade 3, (PA423 16) as prescribed in Specification D 6779 andD 4066.1This specification is under the j
12、urisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.Current edition approved April 1, 2009. Published May 2009.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.or
13、g. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 Rework MaterialClean rework polyamide- 12 mate-rial of the sa
14、me resin, free of any wire or contaminantsgenerated from the fitting manufacturers own production, maybe used by the same manufacturer, as long as the fittingsproduced conform to the requirements of this specification.4.3 Heating MechanismThe heat mechanism shall be ofmaterials not detrimental to th
15、e performance of the fitting orthe pipe to which it is intended to be joined.5. Performance Requirements5.1 The following requirements are for electrofusion jointsthat have been joined using the manufacturers recommendedjoining procedures. These requirements must be met by eachelectrofusion joint de
16、sign, on each size and type of pipematerial for which the manufacturer recommends use of theirfitting. Any revisions to the electrofusion joint design orprocessing by the manufacturer after the initial testing requiresretesting to ensure these requirements can still be met. Fittingsintended for use
17、in the distribution of natural gas or liquidpetroleum gas shall also meet the requirements of SpecificationD 2513.5.1.1 It is not required that each configuration of a fitting betested to meet all of these qualifications (that is, 2 in. mainsaddle joint with multiple outlet configurations offered) a
18、s longas the electrofusion joint design is not altered in the configu-ration differences.NOTE 1It is permissible when accomplishing these tests, to do so onthe highest and lowest dimension ratio of the same pipe material. If inthose tests all performance requirements are met, all dimension ratiosbet
19、ween those tested may be considered as having met the requirements.These tests do not have to cover the full range of dimension ratiosavailable, only the dimension ratio range on which the manufacturerrecommends his fitting be used.5.2 Pressure Requirements:5.2.1 Minimum Hydraulic Burst PressureThe
20、minimumhydraulic burst pressure of the test specimen shall not be lessthan that required to produce 3900psi (26.9MPa) fiber stress inthe pipe being used in the test when tested in accordance with9.1. The test equipment, procedures, and failures definitionsshall be as specified in Test Method D 1599.
21、5.2.2 Sustained PressureThe fitting and fused joint shallnot fail when tested in accordance with 9.2.5.3 Tensile Strength Requirements (Coupling Type JointsOnly)The fitting or the pipe to fitting joint made on pipe shallnot fail when tested in accordance with 9.3. Specimens shall besubjected to a te
22、nsile stress that causes the pipe to yield orcauses the pipe to break outside the joint area. Tensile testsmust be made on specimens as joined, not on straps cut fromthe specimen. Yielding must be measured only in the pipe,independent of the fitting or joint.5.4 Impact Resistance (Saddle Type Joints
23、 Only)The jointmade 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 shallbe considered as a “pass” impact test. The device for testingand the methods shall be as defined
24、in Practice F 905.5.5 Joint Integrity Tests(Couplings and Saddle TypeJoints)The joint made on the specimen shall meet therequirements in 9.4 and 9.5 of this specification, when tested inaccordance with 9.4.6. Dimensions, Mass, and Permissible Variations6.1 Dimension and tolerances of electrofusion f
25、ittings mustbe such that heat fusion is possible to outside diameter (OD)controlled PA-12 pipes such as those listed in SpecificationsD 2513, such that the joints will satisfy the performancerequirements in Section 5. (See Test Method D 2122.)6.2 Because of the varying designs for electrofusion fitt
26、ings,the actual spread of dimensions may be quite different frommanufacturer to manufacturer. A table of dimensions andtolerances encompassing these differences would be meaning-less and without value and, therefore, is omitted from thisspecification.6.3 The manufacturer shall furnish to the user th
27、e electricalresistance, critical dimensions, and tolerances of his fittings.This information must include at least the following dimen-sions and tolerances:6.3.1 Coupling inside diameter,6.3.2 Temperature joining limits, and6.3.3 Operating pressure of the fitting.NOTE 2There are other items that fal
28、l beyond the scope of thisspecification which would be of interest to the user for proper applicationof the fittings and is recommended as additional information to befurnished. A few of these are: (1) maximum pipe out of round allowed atjoint area; (2) minimum/maximum pipe SDR capability of the fit
29、ting, and(3) for saddles intended for use on a live main, the maximum allowableline pressure when making the joint.7. Workmanship, Finish and Appearance7.1 The manufacture of these fittings shall be in accordancewith good commercial practice so as to produce fittingsmeeting the requirements of this
30、specification.7.2 The fittings shall be homogeneous throughout, exceptwhere a heating coil or electrical connectors are incorporated,and free of cracks, holes, foreign inclusions, or injuriousdefects such as gouges, dents, cuts, etc. The fittings shall be asuniform as commercially practicable in opa
31、city, density, andother physical properties. Any heating coils, connecting cables,connectors, and related electrical power source shall be de-signed to prevent electrical shock to the user.8. Specimen Preparation8.1 Conditioning:8.1.1 Unless otherwise specified, condition the specimens(pipe and fitt
32、ings) prior to joining at the minimum pipetemperature allowable for fusion as recommended by themanufacturer, for not less than 16 h and make the fusion jointat that temperature for those tests where conditioning isrequired.8.1.2 Unless otherwise specified, condition the specimens(pipe and fittings)
33、 prior to joining at the maximum pipetemperature allowable for fusion as recommended by themanufacturer, for not less than 16 h and make the fusion jointat that temperature for those tests where conditioning isrequired.F27670928.2 Test ConditionsConduct the tests at the StandardLaboratory Temperatur
34、e of 23.6 6 2C (73.4 6 3.6F) unlessotherwise specified.8.3 Preparation of Specimens for Testing:8.3.1 Prepare test specimens so that the minimum length ofunreinforced pipe on one side of any fitting is equal to threetimes the diameter of the pipe, but in no case less than 12 in.(304 mm). It is permi
35、ssible to test multiple fittings togetherprovided they are separated by a minimum distance equal tothree times the diameter of the pipe, but in no case less than 12in. (304 mm).8.3.2 Fuse all fitting outlets with the appropriate size pipein accordance with the manufacturers recommended proce-dures.8
36、.3.3 All saddle fusion joint specimens conditioned as in8.1.2 and destined for quick burst testing as in 9.1 andsustained pressure testing as in 9.2, are to be joined with thepipe at no less than maximum allowable operating pressure ofthe pipe system or fitting, whichever is lowest, when beingprepar
37、ed for those tests. The pipe should be left under pressurefor a time period not less than recommended by the manufac-turer for cooling in the field prior to disturbing the joint. Saddlejoint specimens destined for mechanical/destructive type testssuch as impact as in 5.4 or crush tests as in 9.4, or
38、 specimensconditioned for cold temperature joining as in 8.1.1, may bemade on unpressured pipe specimens.9. Test Methods9.1 Minimum Hydraulic Burst Pressure Test:9.1.1 Select four fittings at random and prepare specimensin accordance with Section 8. From the four specimens,condition two specimens ea
39、ch in accordance with 8.1.1 and8.1.2.9.1.2 Test the specimens in accordance with Test MethodD 1599.9.1.3 Failure of the fitting or joint shall constitute specimenfailure.9.1.4 Failure of any one of the four specimens shall consti-tute failure of the test. Failure of one of the four specimenstested i
40、s cause for retest of four additional specimens, joined atthe failed specimens joining temperature. Failure of any ofthese four additional specimens constitutes a failure of the test.9.2 Sustained Pressure Test:9.2.1 Select four fittings at random and prepare specimensin accordance with Section 8 of
41、 this specification. From thefour specimens, condition two specimens each in accordancewith 8.1.1 and 8.1.2.9.2.2 Test the specimens in accordance with Test MethodD 1598. All tests shall be conducted at 80 6 2C. Theassemblies are to be subjected to pipe fiber stresses of 1850 psi(12.8 MPa) for 170 h
42、. Joint specimens shall not fail withinthese time periods. Any failures within these time periods mustbe of the pipe, independent of the fitting or joint and must beof a “brittle” type pipe failure, not “ductile.” If ductile pipefailures occur, reduce the pressure of the test and repeat until170-h r
43、esults or pipe brittle failures are achieved.9.2.3 Failure of the fitting or joint shall constitute specimenfailure.9.2.4 Failure of one of the four specimens tested is cause forretest of four additional specimens, joined at the failed-specimens-joining temperature. Failure of any of these fouraddit
44、ional specimens shall constitute a failure of the test.9.3 Tensile Strength Test:9.3.1 Select four fittings at random and prepare specimensin accordance with Section 8. If the limits of tensile machinewill not allow 25 % elongation with pipe specimens ofthree-pipe diameters on pipe sizes above 4 in.
45、 (102 mm) IPSthan the minimum free pipe length can of 20 in. (304 mm).From the four specimens, condition two specimens each inaccordance with 8.1.1 and 8.1.2.9.3.2 Test the specimens using the apparatus of Test MethodD 638. Test at a pull rate of 0.20 in. (5.0 mm) per min, 625 %.9.3.3 Failure of the
46、 fitting or joint as defined in 5.3, shallconstitute specimen failure. Failure of one of the four speci-mens tested is cause for retest of four additional specimens,joined at the failed specimens joining temperature. Failure ofany of these four additional specimens shall constitute a failureof the t
47、est.9.4 Joint Integrity TestsIllustrations of joint crush tests forsocket type joints and saddles are offered in 9.4.1 and 9.4.2 astest methods that are useful as an evaluation of bondingstrength between the pipe and fitting. Alternately, the fusionevaluation test (FET) offered in 9.4.3 and 9.4.4 ma
48、y be used inlieu of the crush test. Similar test evaluations as specified in thecontract or purchase order and as agreed upon by the purchaserand manufacturer are of equal value in performing suchevaluations and may be substituted with such agreement.9.4.1 Joint Crush Test:9.4.1.1 Select four fittin
49、gs at random and prepare specimensin accordance with Section 8. From the four specimens,condition two specimens each in accordance with 8.1.1 and8.1.2 (Note 3).NOTE 3It is permissible to utilize in joint integrity testing, specimensfrom the quick-burst tests conducted in 9.1 after visually determining thatneither the joint area nor the pipe segment to be crushed was a part of thefailure mode in the quick-burst test.9.4.1.2 Slit socket joints longitudinally as illustrated in Fig.1 as near the centerline of the pipe as practical. Pipe lengthsextending out of the so
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