1、Designation: F 1804 03An American National StandardStandard Practice forDetermining Allowable Tensile Load for Polyethylene (PE)Gas Pipe During Pull-In Installation1This standard is issued under the fixed designation F 1804; the number immediately following the designation indicates the year oforigi
2、nal 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 practice provides a means to determine an allow-able tensi
3、le load (ATL) value for a polyethylene gas pipe thatis to be installed underground using methods that pull the pipeinto a trench (cut or plowed), bore hole, casing pipe, or the like.The ATL value takes into account pipe size, tensile yeildstrength, pipe temperature, and pulling load duration.1.2 The
4、 ATL is used to set the break-away strength for a“weak-link” device, or as a limit setting for other devices thatcontrol the maximum pulling force exerted by equipment usedto pull polyethylene gas pipe into an underground location, orto determine if pulling equipment can extert pulling forcegreater
5、than the ATL value for the gas pipe being installed. Aweak-link device is installed where the pipe pulling equipmentis connected to the polyethylene gas pipe. If pulling loadexceeds the ATL limit, the device de-couples the pipe from thepulling equipment. Other measures or equipment that limit thepul
6、ling force on the pipe are also used. When the ATL value iscompared to the pulling force developed by the pull-in instal-lation equipment and equipment cannot extert pulling forcegreater than the ATL value, a weak-link or other device forlimiting the pulling force is not necessary.1.3 This practice
7、does not address weak-link device designor requirements, nor does it address the design or requirementsfor other equipment or procedures used to limit the pullingforce applied to polyethylene gas pipe during pull-in installa-tion.1.4 This practice does not address installation methods orprocedures e
8、mployed for pull-in of polyethylene gas pipe.1.5 Throughout this practice, inch-pound units shall beregarded as standard with SI units in parentheses for informa-tional purposes.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is therespons
9、ibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 638 Test Method for Tensile Properties of Plastics2D 1600 Terminology for Abbreviated Terms R
10、elating toPlastics2D 2513 Specification for Thermoplastic Gas Pressure Pipe,Tubing and Fittings3F 412 Terminology Relating to Plastic Piping Systems33. Terminology3.1 Unless otherwise indicated, abbreviations are in accor-dance with Terminology D 1600, and terms are in accordancewith Terminology F 4
11、12.3.2 allowable tensile load (ATL), nThe maximum tensileload applied to a polyethylene gas pipe during pull-in instal-lation that does not result in an unrecoverable tensile elonga-tion of the pipe.NOTE 1Polyethylene gas pipe materials are visco-elastic, that is, theyexhibit properties associated w
12、ith both elastic materials such as rubber,and viscous materials such as wax or clay. When subjected to a tensileload that is significant, but less than the yield strength, polyethylene willelongate or stretch. If the load is then removed, polyethylene will, overtime, recover all or part of the elong
13、ation, depending upon the magnitudeof the load, and the length of time the load was applied. For the purposesof this practice, elongation that is not completely recovered in about 24 hafter the load is released, is considered unrecoverable.4. Significance and Use4.1 The ATL value is used to set the
14、break-away strength ofa weak-link device, or to set other equipment used to limitpulling force during pull-in installation of polyethylene gaspipe, or to determine if pulling equipment can extert pullingforce greater than the ATL value for the polyethylene gas pipebeing installed.4.2 The ATL value i
15、s determined before gas pipe installa-tion.5. Procedure5.1 The following information about the polyethylene gaspipe is required: size (outside diameter), dimension ratio,1This practice is under the jurisdiction of Committee F17on Plastic PipingSystems and is the direct responsibility of Subcommittee
16、 F17.60 on Gas.Current edition approved April 10, 2003. Published May 2003. Originallyapproved in 1997. Last previous edition approved in 1997 as F 180497.2Annual Book of ASTM Standards, Vol 08.01.3Annual Book of ASTM Standards, Vol 08.04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box
17、C700, West Conshohocken, PA 19428-2959, United States.material tensile yield strength, the approximate temperature ofthe pipe at the time of installation, and the approximate timeunder tension during installation.5.1.1 Pipe size, dimension ratio, and material shall be inaccordance with Specification
18、 D 2513.5.1.2 The pipe material tensile yield strength per TestMethod D 638 at 2 in./min (50.8 mm/min) and 73 6 3F (23 61.8C) is obtained from the pipe manufacturer, or is determinedby testing representative samples of the pipe material inaccordance with Test Method D 638.5.1.3 The temperature of th
19、e pipe at the time of installationis measured at the time of installation using appropriatetemperature measuring equipment, or is estimated using in-staller experience or information from the pipe manufacturer.5.1.4 The time under tension during installation is estimatedusing factors including the s
20、ize and length of pipe beinginstalled, the method of installation, and the nature of theunderground location such as in a casing, or a cut or plowedtrench, or a directionally bored hole.5.2 Calculate the allowable tensile load (ATL) using thefollowing formula:ATL 5 fyftTyp D2F1R1R2G(1)where:ATL = al
21、lowable tensile load, lb (N)NOTE 2The ATL value may be rounded to the nearest 50 lb (0.35MPa).fY= tensile yield design (safety) factorNOTE 3The tensile yield design (safety) factor is usually 0.5 or less.If a design (safety) factor is not available from the pipe manufacturer, avalue of 0.4 is used.f
22、t= time under tension design (safety) factorNOTE 4Based on 5 % strain, suggested time under tension design(safety) factors are 1.00 for times to 1 h, 0.95 for times to 12 h, and 0.91for times to 24 h.Ty= Tensile yield strength, psi (MPa), of the polyethylenepipe material at the pipe installation tem
23、perature.NOTE 5For installation temperatures of 100F (38C) or less, usetensile yield strengths of 2600 psi (18 MPa) for PE2406, 3000 psi (21MPa) for PE3408, or a value from the pipe manufacturer, or from pipematerial sample testing. For installation where pipe temperatures areabove 100F (38C), use a
24、n elevated temperature tensile yield strengthfrom the pipe manufacturer for the polyethylene pipe material beinginstalled.D = Pipe outside diameter, in. (m)R = Pipe dimension ratio6. Report6.1 Report the calculated ATL in pounds (N).7. Keywords7.1 gas pipe; polyethylene; pull-in installationASTM Int
25、ernational takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirel
26、y their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand sh
27、ould be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on St
28、andards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F 1804 032
