1、Designation:F192405 (Reapproved 2011) Designation: F1924 12An American National StandardStandard Specification forPlastic Mechanical Fittings for Use on Outside DiameterControlled Polyethylene Gas Distribution Pipe and Tubing1This standard is issued under the fixed designation F1924; the number imme
2、diately following the 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 Thi
3、s specification describes requirements and test methods for the qualification of plastic bodied mechanical fittings for usewith outside diameter controlled polyethylene (PE) gas distribution pipe, nominal 2 pipe size (IPS) and smaller complying withSpecification D2513. In addition, it specifies gene
4、ral requirements of the material from which these fittings are made.1.2 The test methods described in this specification are not intended to be used as routine quality control tests.1.3 This specification covers the types of mechanical fittings described in 3.2.1.4 The values stated in inch-pound un
5、its are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.5 The following safety hazards caveat pertains only to the test method portion, Section 7, of this specification. This
6、standarddoes not purport to address all of the safety concerns, if any, associated 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.1.6 The text of this speci
7、fication references notes and footnotes, which provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be considered as requirements of this specification.2. Referenced Documents2.1 ASTM Standards:2D638 Test Method for Tensile Properties of PlasticsD1
8、598 Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal PressureD1600 Terminology for Abbreviated Terms Relating to PlasticsD2513 Specification for Polyethylene (PE) Gas Pressure Pipe, Tubing, and FittingsD2837 Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic
9、Pipe Materials or Pressure Design Basis forThermoplastic Pipe ProductsF412 Terminology Relating to Plastic Piping SystemsF1588 Test Method for Constant Tensile Load Joint Test (CTLJT) Test Method for Constant Tensile Load Joint Test (CTLJT)F2897 Specification for Tracking and Traceability Encoding S
10、ystem of Natural Gas Distribution Components (Pipe, Tubing,Fittings, Valves, and Appurtenances)2.2 ASME Standard:ASME B31.8 Gas Transmission and Distribution Piping Systems32.3 Federal Standard:CFR, Title 49, Part 192 Pipeline Safety Regulations42.4 Plastics Pipe Institute Standard:PPI TR-4 Recommen
11、ded Hydrostatic Strengths and Design Stresses for Thermoplastic Pipe and Fittings Compounds53. Terminology3.1 DefinitionsDefinitions of terms used in this specification are in accordance with Terminology F412 unless otherwise1This specification is under the jurisdiction of ASTM Committee F17 on Plas
12、tic Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.Current edition approved Feb. 1, 2011. Published March 2011. Originally approved in 1998. Last previous edition approved in 2001 as F1924011. DOI:10.1520/F1924-05.Current edition approved April 1, 2012. Published May 2
13、012. Originally approved in 1998. Last previous edition approved in 2011 as F192405(2011). DOI:10.1520/F1924-12.2For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the st
14、andards Document Summary page on the ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbi
15、ns Ave., Philadelphia, PA 19111-5098, http:/dodssp.daps.dla.mil.5Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825, Irving, TX 75062, http:/www.plasticpipe.org.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of
16、 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 cases only the current versionof the standard as published by ASTM is to be considered
17、 the official document.*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.specified. Abbreviations are in accordance with Terminology D1600 unless otherwise specified.3.1.
18、1 The Gas Industry terminology used in this specification is in accordance with ASME B31.8 or CFR, Title 49, Part 192unless otherwise indicated.3.1.2 The term “pipe” used herein refers to both “pipe” and “tubing” unless specifically stated otherwise. The term “fitting”refers to a mechanical connecti
19、ng device as described in 3.1.4 and 3.1.6.3.1.3 joint, nthe location at which two pieces of pipe, or a pipe and a fitting are connected together, for example, an installedcoupling has two joints.3.1.4 joint, mechanical, n a connection between piping components employing physical force to develop a s
20、eal or producealignment.3.1.5 long-term strength (LTS), nthe estimated tensile stress that when applied continuously will cause failure at 100 000 h.This is the intercept of the stress regression line with the 100 000 h coordinate.3.1.6 mechanical fitting, nfitting for making a mechanical joint to p
21、rovide for pressure integrity, leak tightness, and dependingon category, as defined in this specification, resistance to end loads.3.1.6.1 category 1 mechanical fitting, nfitting for assembling pipes, which includes a compression zone(s) to provide forpressure integrity, leak tightness, and resistan
22、ce to end loads sufficient to cause no less than 25 % elongation of the PE piping asdescribed in this specification.3.1.6.2 category 2 mechanical fitting, nfitting for assembling pipes, which includes a compression zone(s) to provide forpressure integrity and leak tightness only. Category 2 fittings
23、 do not provide for resistance to end loads.3.1.7 MAOP, nthe Maximum Allowable Operating Pressure of the fuel gas piping system, in psig, as determined inaccordance with CFR, Title 49, Part 192.121 and as represented in the following:MAOP 5 P 5 2 3 S/R21! 3 fD(1)F1924-12_1where:S = the PE materials
24、HDB as published in PPI TR-4.R = the pipes dimension ratio determined by dividing the pipes specified nominal outside diameter by the pipes specifiednominal wall thickness; and,fD= the design (derating) factor for thermoplastic fuel gas piping as set by the authority having jurisdiction. In the Unit
25、edStates the design factor is cited in CFR, Title 49 Part 192.121.3.2 Types of Mechanical Fittings:3.2.1 in-line fitting, nmechanical fitting used to make a mechanical joint where the bore axis of the compression and sealingzones of the fitting is essentially the same as the connected piping, for ex
26、ample, couplings, ells, and tees.3.2.2 mechanical saddle fitting, nmechanical fitting used to make a mechanical joint that allows a lateral connection to anexisting main in which a portion of the fitting is contoured to match the O.D. of the pipe to which it is attached. Herein referredto as the sad
27、dle fitting mating pipe.4. Materials and Manufacture Requirements4.1 Plastic pressure containing materials subject to continuous stress, either hoop or axial, shall have an ASTM materialspecification, and the materials long-term strength, such as the long-term hydrostatic strength, determined in acc
28、ordance with TestMethod D2837, excepting that failure data can be obtained from specimens such as the following: tensile bars, plane strain, oractual fitting samples. A material listing in PPI TR-4 document is evidence of compliance with this paragraph for third partycertifying and listing agencies.
29、4.2 The physical properties of each material used to produce the fitting shall be available from the fitting manufacturer uponrequest.4.3 Specifications outlining all the physical properties and effects of environmental conditions for materials of manufacture shallbe available from the fitting manuf
30、acturer upon request.NOTE 1Materials in long-term contact with natural gas of line quality and LP gas vapor should be demonstrated not to adversely affect theperformance of the fitting.NOTE 2Materials should have a demonstrated resistance to environmental stress cracking when exposed, under stress,
31、to chemical compoundsencountered in, or external to gas piping systems, and a demonstrated resistance to bacteriological decomposition. Such compounds include, but are notlimited to, ice thawing chemicals, fertilizers, insecticides, herbicides, leak detection fluids, acids, bases and antifreeze solu
32、tions used to thaw frozen lines.The effects of liquid environments, such as antifreeze agents, odorants, and hydrocarbons are known to be deleterious to some plastics, particularly whenunder service conditions.5. Dimensions5.1 The dimensions and tolerances shall be determined by the manufacturer.6.
33、Qualification Requirements6.1 GeneralUnless otherwise specified, each nominal size of fitting shall be tested. Testing of the thickest wall pipe that thefitting is designed to be used with qualifies the use of that fitting with pipe of lesser wall thickness.F1924 1226.1.1 Mechanical joint qualificat
34、ions shall be performed on assembled joints using the fitting manufacturers joining procedure.All mechanical fittings offered by the manufacturer shall be capable of meeting the requirements of this standard when connectingpolyethylene gas piping complying with Specification D2513. To verify the str
35、uctural integrity of the fitting body, representativesamples shall be subjected to the requirements of 6.2.1. It is not the intent of this specification to require testing of all fittingconfigurations, that is, tees, ells, etc., but each mechanical joint design in each size.6.1.2 All mechanical fitt
36、ings described in 3.2 shall have an internal pipe reinforcing tubular insert stiffener that extends at leastunder the seal and gripping device, where used.The saddle portion of saddle-type fittings do not require an internal tubular stiffenerdue to the nature of the connection.6.2 Performance Requir
37、ements:6.2.1 Elevated Temperature Sustained PressureThe fitting, joint or pipe in the area affected by the fitting shall not fail asdefined in Test Method D1598, when tested in accordance with 7.2. The fitting or joint meets this requirement when tested inaccordance with any one of the three conditi
38、ons (A, B, or C) listed in 7.2.6.2.2 Tensile StrengthThe pipe joint shall accommodate the tensile loadings when tested in accordance with 7.3.6.2.2.1 In-Line Fittings, Category 1The joint shall provide resistance to a force on the pipe joint equal to or greater than thatwhich will cause no less than
39、 25 % elongation of pipe, or the pipe fails outside the joint area when tested in accordance with 7.3.6.2.2.2 In-Line Fittings, Category 2A joint design that provides a seal only. A mechanical joint designed for this categoryexcludes any provisions in the design of the joint to resist any axial pull
40、out forces; therefore, tensile tests are not required.6.2.2.3 Mechanical Saddle FittingsThe joint between the saddle and mating pipe shall not fail by rotation or leakage whentested in accordance with 7.6.6.2.2.4 Joint restraint capabilities less than as defined above shall constitute failure of the
41、 test.6.2.3 Temperature Cycling TestThe mechanical joint shall provide a pressure seal after 10 cycles of the temperature cyclingtest when tested in accordance with 7.4.6.2.4 Constant Tensile Load Joint Test The joint shall not fail by leakage or pullout when loaded to an axial tensile stress of1320
42、 psi (9.1 MPa) and tested in accordance with 7.5.7. Test Methods7.1 GeneralThe test methods in this specification cover mechanical joint designs. Test methods that are applicable from otherspecifications will be referenced in the section pertaining to that particular test.7.1.1 ConditioningUnless ot
43、herwise specified, condition the specimens (pipe and fittings) prior to joining at 73.4 6 3.6 F(23 6 2 C) for not less than 16 h.7.1.2 Test ConditionsConduct the tests at the standard laboratory temperature of 73.4 6 3.6 F (23 6 2 C) unless otherwisespecified.7.1.3 Test SpecimensTest joints shall be
44、 prepared with the appropriate size PE pipe, complying with the dimensionalrequirements of Specification D2513, in accordance with the manufacturers joining procedures.7.2 Elevated Temperature Sustained Pressure Test:7.2.1 The apparatus and report shall be as specified in Test Method D1598. Test six
45、 joints assembled in accordance with 6.1.1.7.2.2 The assembled joints shall be tested in accordance with Test Method D1598 with the exception that it is not required that12 in. or five times the nominal outside diameter of the pipe used in conducting the test be placed on each side of the fitting be
46、ingtested. The test shall be conducted at one of the time/temperature/hoop stress combinations shown in Table 1 with the test pressurecalculated using Eq 2. If ductile failure occurs in the pipe at 176F (80C)/670 psi (4.6 MPa) hoop stress, retest at 176F(80C)/580 psi (4.0 MPa) hoop stress.F1924-12_2
47、where:P = test pressure, psig,S = hoop stress from Table 1, andDR = dimension ratio (OD/wall).7.2.3 Failure of two of the six specimens tested shall constitute failure in the test. Failure of one of the six specimens tested iscause for retest of six additional specimens. Failure of one of the six sp
48、ecimens in retest shall constitute failure of the test. Evidenceof failure of the pipe shall be as defined in Test Method D1598.TABLE 1 Elevated Temperature Sustained Pressure TestConditionsCondition Minimum Time Temperature Pipe Hoop Stress, SA 3 000 h 14063.6F(606 2C)1 000 psi (6.8 MPa)B 1 000 h 1
49、7663.6F(806 2C)580 psi (4.0 MPa)C 170 h 17663.6F(806 2C)670 psi (4.6 MPa)F1924 1237.3 Tensile Strength Test:7.3.1 Test specimens shall be prepared so that the minimum length of unreinforced pipe is equal to five times the nominaloutside diameter of the pipe being tested. It is permissible to test multiple joints together provided the minimum length ofunreinforced pipe (as stated above) exists on at least one joint.7.3.2 In-line fittings shall be tested with the apparatus and reported as specified in Test Method D638. Test six joints
