ASTM F1804-2008 Standard Practice for Determining Allowable Tensile Load for Polyethylene (PE) Gas Pipe During Pull-In Installation《沿路安装过程聚乙烯(PE)煤气管的许可拉伸载荷测定用规程》.pdf

1、Designation: F 1804 08An 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 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 not purport to ad

9、dress 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 Standards:2D 638 Test M

10、ethod for Tensile Properties of PlasticsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 2513 Specification for Thermoplastic Gas Pressure Pipe,Tubing, and FittingsF 412 Terminology Relating to Plastic Piping Systems3. Terminology3.1 Unless otherwise indicated, abbreviations are in acco

11、r-dance with Terminology D 1600, and terms are in accordancewith Terminology F 412.3.2 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 ga

12、s 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 stretch. If the loa

13、d 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 released, is consi

14、dered 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 pullingforce greater tha

15、n 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 May 1, 2008. Published May 2008. Originallyapproved in 1997. Last pr

16、evious edition approved in 2003 as F 180403.2For 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 Summary page onthe ASTM website.1Copyright ASTM I

17、nternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 The ATL value is determined before gas pipe installa-tion.5. Procedure5.1 The following information about the polyethylene gaspipe is required: size (outside diameter), dimension ratio,material tens

18、ile 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 D 2513.5.1.2 The pipe material tensile yield strength per TestMeth

19、od 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 the pipe at the time of installationis measured at the time of instal

20、lation 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 beinginstalled, the method of installation,

21、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 = allowable tensile load, lb (N)NOTE 2The ATL value may be rounded to t

22、he 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 design (safety) factorNOTE 4Based on 5 % stra

23、in, 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 installation temperatures of 100F (38C) or less,

24、 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 temperatures are above 100F(38C), use an elevate

25、d 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; polyethylene; pull-in installationASTM Internation

26、al 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 entirely their

27、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 should be

28、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 Standards,

29、 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 082