1、Designation: F1804 08 (Reapproved 2012) An American National StandardStandard Practice forDetermining Allowable Tensile Load for Polyethylene (PE)Gas Pipe During Pull-In Installation1This standard is issued under the fixed designation F1804; the number immediately following the designation indicates
2、 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. Scope1.1 This practice provides a means to determine an
3、allow-able tensile 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
4、duration.1.2 The 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 pulli
5、ng forcegreater 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 t
6、hat limit thepulling 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.
7、3 This practice 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 method
8、s orprocedures employed for pull-in of polyethylene gas pipe.1.5 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 information onlyand are not considered standard.1.6 This standard does n
9、ot purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility 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 Standar
10、ds:2D638 Test Method for Tensile Properties of PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2513 Specification for Polyethylene (PE) Gas PressurePipe, Tubing, and FittingsF412 Terminology Relating to Plastic Piping Systems3. Terminology3.1 Unless otherwise indicated, abbrevia
11、tions are in accor-dance with Terminology D1600, and terms are in accordancewith Terminology F412.3.2 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 1
12、Polyethylene gas pipe materials are visco-elastic, that is, theyexhibit properties associated with 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 stre
13、tch. If the load is then removed, polyethylene will, overtime, recover all or part of the elongation, 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 rel
14、eased, is considered unrecoverable.4. Significance and Use4.1 The ATL value is used to set the 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 pullingfo
15、rce greater than the ATL value for the polyethylene gas pipebeing installed.1This practice is under the jurisdiction of Committee F17 on Plastic PipingSystems and is the direct responsibility of Subcommittee F17.60 on Gas.Current edition approved Aug. 1, 2012. Published October 2012. Originallyappro
16、ved in 1997. Last previous edition approved in 2008 as F180408. DOI:10.1520/F1804-08R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summa
17、ry page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.2 The ATL value is determined before gas pipe installa-tion.5. Procedure5.1 The following information about the polyethylene gaspipe is required: size (outsi
18、de diameter), dimension ratio,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 D2513.5.1.2 The pipe ma
19、terial tensile yield strength per TestMethod D638 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 D638.5.1.3 The temperature of the pipe at the time of insta
20、llationis 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 size and length of pipe bein
21、ginstalled, 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 D2F1R21R2G(1)where:ATL = allowable tensile load, lb (
22、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.ft= time under tension desi
23、gn (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 temperature.NOTE 5For install
24、ation temperatures of 100F (38C) or less, usetensile yield strengths of 2600 psi (18 MPa) for PE2406, PE2606, and PE2708, or 3000 psi (21 MPa) for PE3408 PE3608, PE3710, PE4608, andPE4710, or a value from the pipe manufacturer, or from pipe materialsample testing. For installation where pipe tempera
25、tures are above 100F(38C), use an elevated temperature tensile yield strength from the pipemanufacturer for the polyethylene pipe material being installed.D = Pipe outside diameter, in. (m)R = Pipe dimension ratio6. Report6.1 Report the calculated ATL in pounds (N).7. Keywords7.1 gas pipe; polyethyl
26、ene; pull-in installationASTM International 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 infring
27、ement of such rights, are entirely 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
28、or for additional standardsand should 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
29、known to the ASTM Committee on Standards, 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).F1804 08 (2012)2
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