1、Designation: F 1924 05An 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 F 1924; the number immediately following the designation in
2、dicates 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification describes requiremen
3、ts and test meth-ods for the qualification of plastic bodied mechanical fittingsfor use with outside diameter controlled polyethylene (PE) gasdistribution pipe, nominal 2 pipe size (IPS) and smallercomplying with Specification D 2513. In addition, it specifiesgeneral requirements of the material fro
4、m which these fittingsare made.1.2 The test methods described in this specification are notintended to be used as routine quality control tests.1.3 This specification covers the types of mechanical fittingsdescribed in 3.2.1.1.4 The values stated in inch-pound units are to be regardedas the standard
5、. The values given in parentheses are forinformation only.1.5 The following safety hazards caveat pertains only to thetest method portion, Section 7, of this specification. Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility o
6、f the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.1.6 The text of this specification references notes andfootnotes, which provide explanatory material.These notes andfootnotes (excluding those in tab
7、les and figures) shall not beconsidered as requirements of this specification.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 Constant Internal PressureD 1600 Terminology for Abbreviated Terms
8、Relating toPlasticsD 2513 Specification for Thermoplastic Gas Pressure Pipe,Tubing, and FittingsD 2837 Test Method for Obtaining Hydrostatic DesignBasis for Thermoplastic Pipe MaterialsF 412 Terminology Relating to Plastic Piping SystemsF 1588 Test Method for Constant Tensile Load Joint Test(CTLJT)2
9、.2 ASME Standard:ASME B31.8 Gas Transmission and Distribution PipingSystems32.3 Federal Standard:CFR, Title 49, Part 192 Pipeline Safety Regulations42.4 Plastics Pipe Institute Standard:PPI TR-4 Recommended Hydrostatic Strengths and DesignStresses for Thermoplastic Pipe and Fittings Compounds53. Ter
10、minology3.1 DefinitionsDefinitions of terms used in this specifica-tion are in accordance with Terminology F 412 unless other-wise specified.Abbreviations are in accordance with Terminol-ogy D 1600 unless otherwise specified.3.1.1 The Gas Industry terminology used in this specifica-tion is in accord
11、ance with ASME B31.8 or CFR, Title 49, Part192 unless 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 connecting device as described in 3.1.4and 3.1.6.3.1.3 joint, nthe location at w
12、hich two pieces of pipe, ora pipe and a fitting are connected together, for example, aninstalled coupling has two joints.3.1.4 joint, mechanical, n a connection between pipingcomponents employing physical force to develop a seal orproduce alignment.3.1.5 long-term strength (LTS), nthe estimated tens
13、ilestress that when applied continuously will cause failure at100 000 h. This is the intercept of the stress regression linewith the 100 000 h coordinate.1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.
14、60 on Gas.Current edition approved August 1, 2005. Published August 2005. Originallyapproved in 1998. Last previous edition approved in 2001 as F 192401e1.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM
15、Standards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers, Three ParkAvenue, New York, NY 100165990.4Available from Superintendent of Documents, U.S. Government PrintingOffice, Washington, DC 20402.5Availabl
16、e from Plastics Pipe Institute, 1801 K Street NW, Suite 600K,Washington, DC 20402.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.6 mechanical fitting, nfitting for making a mechanicaljoint to provide for pressure integrity, leak
17、 tightness, anddepending on category, as defined in this specification, resis-tance to end loads.3.1.6.1 category 1 mechanical fitting, nfitting for assem-bling pipes, which includes a compression zone(s) to providefor pressure integrity, leak tightness, and resistance to endloads sufficient to caus
18、e no less than 25 % elongation of the PEpiping as described in this specification.3.1.6.2 category 2 mechanical fitting, nfitting for assem-bling pipes, which includes a compression zone(s) to providefor pressure integrity and leak tightness only. Category 2fittings do not provide for resistance to
19、end loads.3.1.7 MAOP, nthe Maximum Allowable Operating Pres-sure of the fuel gas piping system, in psig, as determined inaccordance with CFR, Title 49, Part 192.121 and as repre-sented in the following:MAOP 5 P 5 2 3 S/R21! 3 fD(1)where:S = the PE materials HDB as published in PPI TR-4.R = the pipes
20、 dimension ratio determined by dividing thepipes specified nominal outside diameter by the pipesspecified nominal wall thickness; and,fD= the design (derating) factor for thermoplastic fuel gaspiping as set by the authority having jurisdiction. Inthe United States the design factor is cited in CFR,T
21、itle 49 Part 192.121.3.2 Definitions of Terms Specific to This Standard:3.2.1 Types of Mechanical Fittings:3.2.2 in-line fitting, nmechanical fitting used to make amechanical joint where the bore axis of the compression andsealing zones of the fitting is essentially the same as theconnected piping,
22、for example, couplings, ells, and tees.3.2.3 mechanical saddle fitting, nmechanical fitting usedto make a mechanical joint that allows a lateral connection toan existing main in which a portion of the fitting is contouredto match the O.D. of the pipe to which it is attached. Hereinreferred to as the
23、 saddle fitting mating pipe.4. Materials and Manufacture Requirements4.1 Plastic pressure containing materials subject to continu-ous stress, either hoop or axial, shall have an ASTM materialspecification, and the materials long-term strength, such as thelong-term hydrostatic strength, determined in
24、 accordance withTest Method D 2837, excepting that failure data can beobtained from specimens such as the following: tensile bars,plane strain, or actual fitting samples. A material listing in PPITR-4 document is evidence of compliance with this paragraphfor third party certifying and listing agenci
25、es.4.2 The physical properties of each material used to producethe fitting shall be available from the fitting manufacturer uponrequest.4.3 Specifications outlining all the physical properties andeffects of environmental conditions for materials of manufac-ture shall be available from the fitting ma
26、nufacturer uponrequest.NOTE 1Materials in long-term contact with natural gas of line qualityand LP gas vapor should be demonstrated not to adversely affect theperformance of the fitting.NOTE 2Materials should have a demonstrated resistance to environ-mental stress cracking when exposed, under stress
27、, to chemical com-pounds encountered in, or external to gas piping systems, and a demon-strated resistance to bacteriological decomposition. Such compoundsinclude, but are not limited to, ice thawing chemicals, fertilizers, insecti-cides, herbicides, leak detection fluids, acids, bases and antifreez
28、esolutions used to thaw frozen lines. The effects of liquid environments,such as antifreeze agents, odorants, and hydrocarbons are known to bedeleterious to some plastics, particularly when under service conditions.5. Dimensions5.1 The dimensions and tolerances shall be determined bythe manufacturer
29、.6. Qualification Requirements6.1 GeneralUnless otherwise specified, each nominal sizeof fitting shall be tested. Testing of the thickest wall pipe thatthe fitting is designed to be used with qualifies the use of thatfitting with pipe of lesser wall thickness.6.1.1 Mechanical joint qualifications sh
30、all be performed onassembled joints using the fitting manufacturers joining pro-cedure. All mechanical fittings offered by the manufacturershall be capable of meeting the requirements of this standardwhen connecting polyethylene gas piping complying withSpecification D 2513. To verify the structural
31、 integrity of thefitting body, representative samples shall be subjected to therequirements of 6.2.1. It is not the intent of this specification torequire testing of all fitting configurations, that is, tees, ells,etc., but each mechanical joint design in each size.6.1.2 All mechanical fittings desc
32、ribed in 3.2.1 shall have aninternal pipe reinforcing tubular insert stiffener that extends atleast under the seal and gripping device, where used. Thesaddle portion of saddle-type fittings do not require an internaltubular stiffener due to the nature of the connection.6.2 Performance Requirements:6
33、.2.1 Elevated Temperature Sustained PressureThe fit-ting, joint or pipe in the area affected by the fitting shall not failas defined in Test Method D 1598, when tested in accordancewith 7.2.The fitting or joint meets this requirement when testedin accordance with any one of the three conditions (A,
34、B, or C)listed in 7.2.6.2.2 Tensile StrengthThe pipe joint shall accommodatethe tensile loadings when tested in accordance with 7.3.6.2.2.1 In-Line Fittings, Category 1The joint shall pro-vide resistance to a force on the pipe joint equal to or greaterthan that which will cause no less than 25 % elo
35、ngation of pipe,or the pipe fails outside the joint area when tested in accor-dance with 7.3.6.2.2.2 In-Line Fittings, Category 2A joint design thatprovides a seal only. A mechanical joint designed for thiscategory excludes any provisions in the design of the joint toresist any axial pullout forces;
36、 therefore, tensile tests are notrequired.6.2.2.3 Mechanical Saddle FittingsThe joint between thesaddle and mating pipe shall not fail by rotation or leakagewhen tested in accordance with 7.6.6.2.2.4 Joint restraint capabilities less than as defined aboveshall constitute failure of the test.F1924052
37、6.2.3 Temperature Cycling TestThe mechanical joint shallprovide a pressure seal after 10 cycles of the temperaturecycling test when tested in accordance with 7.4.6.2.4 Constant Tensile Load Joint Test The joint shall notfail by leakage or pullout when loaded to an axial tensile stressof 1320 psi (9.
38、1 MPa) and tested in accordance with 7.5.7. Test Methods7.1 GeneralThe test methods in this specification covermechanical joint designs.Test methods that are applicable fromother specifications will be referenced in the section pertainingto that particular test.7.1.1 ConditioningUnless otherwise spe
39、cified, conditionthe specimens (pipe and fittings) prior to joining at 73.4 6 3.6F (23 6 2 C) for not less than 16 h.7.1.2 Test ConditionsConduct the tests at the standardlaboratory temperature of 73.4 6 3.6 F (23 6 2 C) unlessotherwise specified.7.1.3 Test SpecimensTest joints shall be prepared wit
40、h theappropriate size PE pipe, complying with the dimensionalrequirements of Specification D 2513, in accordance with themanufacturers joining procedures.7.2 Elevated Temperature Sustained Pressure Test:7.2.1 The apparatus and report shall be as specified in TestMethod D 1598. Test six joints assemb
41、led in accordance with6.1.1.7.2.2 The assembled joints shall be tested in accordancewith Test Method D 1598 with the exception that it is notrequired that 12 in. or five times the nominal outside diameterof the pipe used in conducting the test be placed on each sideof the fitting being tested. The t
42、est shall be conducted at one ofthe time/temperature/hoop stress combinations shown in Table1 with the test pressure calculated using Eq 2. If ductile failureoccurs in the pipe at 176F (80C)/670 psi (4.6 MPa) hoopstress, retest at 176F (80C)/580 psi (4.0 MPa) hoop stress.P 52SDR 2 1(2)where:P = test
43、 pressure, psig,S = hoop stress from Table 1, andDR = dimension ratio (OD/wall).7.2.3 Failure of two of the six specimens tested shallconstitute failure in the test. Failure of one of the six specimenstested is cause for retest of six additional specimens. Failure ofone of the six specimens in retes
44、t shall constitute failure of thetest. Evidence of failure of the pipe shall be as defined in TestMethod D 1598.7.3 Tensile Strength Test:7.3.1 Test specimens shall be prepared so that the minimumlength of unreinforced pipe is equal to five times the nominaloutside diameter of the pipe being tested.
45、 It is permissible totest 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 andreported as specified in Test Method D 638. Test six joints.7.3.3 The test shall be conducted
46、 at 73.4 6 3.6F (23 62C).7.3.4 The speed of the testing shall be 0.2 in. (5 mm)/min625 %.7.3.5 Failure of any sample shall constitute failure of thetest.7.4 Temperature Cycling Test:7.4.1 Tests shall be conducted on six of the smallest and sixof the largest nominal pipe sizes of each mechanical join
47、tdesign and assembled in accordance with 6.1.1.7.4.2 Leak test specimens at ambient at 7 6 3 psig and aminimum of 1.5 3 MAOP.7.4.3 Cool specimens to a temperature of 20 6 3.6F (296 2C) and maintain for a minimum of 2.5 h.7.4.4 Condition specimens to a temperature of 140 6 3.6F(60 6 2C) and maintain
48、for a minimum of 2.5 h.7.4.5 Repeat 7.4.3 and 7.4.4 for a total of 10 cycles.7.4.6 Pressurize 50 % of the speciments of each size at 7 63 psig and the remaining 50 % of each size at 1.53 MAOP ofthe piping material and SDR that the fittings are designed to beused with. Leak test first at 140 6 3.6F (
49、60 6 2C) and thenat 20 6 3.6F (29 6 2C).NOTE 3If immersion is used for leak testing, and the design of thejoint is such that air can be trapped within the joint assembly, allowadequate time for all air trapped within the joint to escape prior toobserving for leaks.7.5 Constant Tensile Load Joint Test (In-Line Joints Only):7.5.1 One specimen of each nominal pipe size shall betested in accordance with Test Method F 1588 for a minimumof 1000 h at an internal pressure between 4 psig (27.6 kPa) andthe pipe MAOP.7.5.2 Failure of the speci
