1、Designation: F2767 12F2767 18 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 th
2、e 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 specification cove
3、rs polyamide- 12 electrofusion fittings for use with outside diameter-controlled polyamide- 12 pipe,covered by Specification F2785. Requirements for materials, workmanship, and testing performance are included. Whereapplicable in this specification “pipe” shall mean “pipe” or “tubing.”1.2 Polyamide
4、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 mathematicalconve
5、rsions 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, associated with i
6、ts use. It is the responsibility of the user of thisstandard to establish appropriate safety safety, health, and healthenvironmental practices and determine the applicability ofregulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recogn
7、ized 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:2D638 Test Method for Ten
8、sile Properties of PlasticsD1598 Test 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 De
9、termining Dimensions of Thermoplastic Pipe and FittingsD4066 Classification System for Nylon Injection and Extrusion Materials (PA)D6779 Classification System for and Basis of Specification for Polyamide Molding and Extrusion Materials (PA)F412 Terminology Relating to Plastic Piping SystemsF905 Prac
10、tice 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 accordance with Terminology D1600, unlessotherwise specified.3.2 Defin
11、itions 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 plastics.1 This specification is under the jurisdiction of ASTM Co
12、mmittee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.Current edition approved Oct. 15, 2012April 1, 2018. Published December 2012April 2018. Originally approveapproved in 2009. Last previous edition appeovedapprovedin 20092012 as F276709.12. DOI: 10.15
13、20/F2767-12.10.1520/F2767-18.2 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.This document is not an ASTM
14、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 appropriate. In all
15、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 States13.2.2 fusion
16、 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.4. Materials and Manufacture4.1 This specification covers fittings made from p
17、olyamide 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- 12 material of the same resin, free of any wire or contaminants generated fromthe fitting manufacturers own production, m
18、ay 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 materials not detrimental to the performance of the fitting or the pipeto which it is intended to be joined.5. Performance Requir
19、ements5.1 The following requirements are for electrofusion joints that have been joined using the manufacturers recommended joiningprocedures. These requirements must be met by each electrofusion joint design, on each size and type of pipe material for whichthe manufacturer recommends use of their f
20、itting. Any revisions to the electrofusion joint design or processing by the manufacturerafter the initial testing requires retesting to ensure these requirements can still be met. Fittings intended for use in the distributionof natural gas or liquid petroleum gas shall also meet the requirements of
21、 Specification F2785.5.1.1 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 multiple outlet configurations offered) as long as the electrofusion joint design is not altered in the configurationdifferences.NOTE
22、 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 requirements are met, all dimension ratios between those tested may be considered as having met the requirements. These tests donot have
23、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:5.2.1 Minimum Hydraulic Burst PressureThe minimum hydraulic burst pressure of the test specimen shall not be less thanthat required
24、 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 shall be as specified in Test Method D1599.5.2.2 Sustained PressureThe fitting and fused joint shall not fail when tested in accor
25、dance 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 with 9.3. Specimens shall be subjected to a tensile stress that causes the pipe to yield or causes thepipe to break outside the jo
26、int 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 joint.5.4 Impact Resistance (Saddle Type Joints Only)The joint made on the specimen shall not fail when impacted with a forcesuff
27、icient 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 for testing and the methods shall be as defined in Practice F905.5.5 Joint Integrity Tests(Couplings and Saddle Type Joints)The
28、 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 Variations6.1 Dimension shall be measured using Test Method D2122. Dimensions and tolerances of electrofusion fittings must be suchthat
29、 heat fusion is possible to outside diameter (OD) controlled PA-12 pipes such as those listed in Specification F2785, such thatthe joints will satisfy the performance requirements in Section 55. (See Test Method . D2122.)6.2 Because of the varying designs for electrofusion fittings, the actual sprea
30、d 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 this specification.NOTE 2Because of the varying designs for electrofusion fittings, the a
31、ctual spread of dimensions may be quite different from manufacturer tomanufacturer. A table of dimensions and tolerances encompassing these differences would be meaningless and without value and, therefore, is omittedfrom this specification.6.2 The manufacturer shall furnish to the user the electric
32、al resistance, critical dimensions, and tolerances of his fittings. Thisinformation must include at least the following dimensions and tolerances:6.2.1 Coupling inside diameter,6.2.2 Temperature joining limits, and6.2.3 Operating pressure of the fitting.NOTE 3There are other items that fall beyond t
33、he scope of this specification which would be of interest to the user for proper application of the fittingsF2767 182and is recommended as additional information to be furnished. A few of these are: (1) maximum pipe out of round allowed at joint area; (2)minimum/maximum pipe SDR capability of the fi
34、tting, 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 commercial practice so as to produce fittings meetingthe requirements of th
35、is specification.7.2 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, dents, cuts, etc. The fittings shall be as uniform ascommercially practicable i
36、n 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 Conditioning:8.1.1 Unless otherwise specified, condition the specimens (pipe an
37、d 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 is required.8.1.2 Unless otherwise specified, condition the specimens (pipe and
38、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 required.8.1.3 Unless otherwise specified, condition the fittings prior to join
39、ing at ambient temperature and the pipe at the minimumtemperature allowable for fusion as recommended by the manufacturer, for not less than 16 h and make the fusion joint at theminimum pipe temperature for those tests where conditioning is required8.2 Test ConditionsConduct the tests at the Standar
40、d Laboratory Temperature of 23.623 6 2C2 C (73.4 6 3.6F)3.6 F)unless otherwise specified.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 timesthe diameter of the pipe, but in no case le
41、ss 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 the appropriate size pipe in accordance with the
42、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 allowable operating pressure of the pipe systemor fittin
43、g, 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 destinedfor mechanical/destructive type tests such as impa
44、ct 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 prepare specimens in accordance with Section 8. From th
45、e 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 specimens shall constitute failure of the test.
46、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 Test:9.2.1 Select four fittings at random and pre
47、pare 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 80 6 2C.2 C. The assembliesare to be subjected to
48、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 “ductile.” If ductile pipe failures occur, r
49、educe 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 additional specimens, joined at thefailed-specimens-joining temperature. Failure of any of these four additional specimens shall constitute a failure of the test.F2767 1839.3 Tensile Strength Test:9.3.1 Select four fittings at random and prepare specimens in accordance with Section 8. If the limits of tensile
