ASTM F1804-2008(2016) Standard Practice for Determining Allowable Tensile Load for Polyethylene (PE) Gas Pipe During Pull-In Installation《在拉入式安装期间测定聚乙烯(PE)燃气管道允许拉伸载荷的标准惯例》.pdf

1、Designation: F1804 08 (Reapproved 2016)Standard 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 the year oforiginal adoption

2、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 allow-able tensile load (ATL)

3、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 ATL is used t

4、o 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 than the ATL v

5、alue 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 thepulling force on

6、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 does not addre

7、ss 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 employed for pu

8、ll-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 address all of t

9、hesafety 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:2D638 Test Method for Tensi

10、le 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, abbreviations are in accor-dance with

11、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 1Polyethylene gas pipe material

12、s 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 load is then remov

13、ed, 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 considered unrecover

14、able.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 than the ATL value

15、 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 Nov. 1, 2016. Published November 2016. Originallyapproved in 1997. Last previous ed

16、ition approved in 2012 as F180408(2012). 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 Summary page onthe ASTM webs

17、ite.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 (outside diameter), dimension

18、 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 material tensile yield st

19、rength 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 installationis measured at t

20、he 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 beinginstalled, the method

21、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 fyftTy D2F1R21R2G(1)where:ATL = allowable tensile load, lb (N)NOTE 2The ATL value ma

22、y 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 design (safety) factorNOTE 4

23、Based 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 installation temperatures of 10

24、0F (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 temperatures are above 100F(38C

25、), 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; polyethylene; pull-in installatio

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29、tee 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 08 (2016)2