1、Designation:D159815aStandard Test Method forTime-to-Failure of Plastic Pipe Under Constant InternalPressure1This standard is issued under the fixed designation D1598;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last re
2、vision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of the time-to-failure of both thermoplastic and reinforced thermosetting/resin pipe un
3、der constant internal pressure.1.2 This test method provides a method of characterizingplastics in the form of pipe under the conditions prescribed.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are
4、 provided for information onlyand are not considered standard.1.4 This standard does not 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-bi
5、lity of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD2837 Test Method for Obtaining Hydrostatic Design Basisfor Thermoplastic Pipe Materials or Pressure Design Basisfor Thermoplastic Pip
6、e ProductsD2992 Practice for Obtaining Hydrostatic or Pressure De-sign Basis for“Fiberglass”(Glass-Fiber-ReinforcedThermosetting-Resin)Pipe and FittingsD2517 Specification for Reinforced Epoxy Resin Gas Pres-sure Pipe and FittingsD3567 Practice for Determining Dimensions of“Fiberglass”(Glass-Fiber-R
7、einforced Thermosetting Resin)Pipe andFittings3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 failure,noccurrence of ballooning,rupture,seepageor weeping.3.1.1.1 ballooning,nany localized expansion of a pipewhile under internal pressure.This is sometimes referred to asductile f
8、ailure.3.1.1.1.1 DiscussionOverall distention caused by appliedstress is not considered to be a failure.3.1.1.2 rupture,na break in the pipe wall with immediateloss of test fluid and continued loss at essentially no pressure.If rupture is not preceded by some yielding,this may be termeda non-ductile
9、 failure.3.1.1.3 seepage or weeping,ntest fluid passing throughcracks in the pipe wall to an extent detectable visually orelectronically.A reduction in pressure will frequently enablethe pipe to carry fluid without apparent evidence of loss offluid.3.1.2 free(unrestrained)end closure,na pipe specime
10、nend closure(cap)that seals the end of the pipe against loss ofinternal fluid and is fastened to the pipe specimen.3.1.3 restrained end closure,na pipe specimen end clo-sure(cap)that seals the end of the specimen against loss ofinternal fluid and pressure,but is not fastened to the pipespecimen.Reta
11、ined end closures rely on tie-rod(s)through thepipe specimen or on an external structure to resist internalpressure end thrust.4.Summary of Test Method4.1 This test method consists of exposing specimens of pipeto a constant internal pressure while in a controlled environ-ment.Such a controlled envir
12、onment may be accomplished by,but is not limited to,immersing the specimens in a controlledtemperature water or air bath.The time-to-failure is measured.NOTE1Dimensional changes should be measured on specimensundergoing long-term strength tests.Measurements using circumferentialtapes,strain gages,or
13、 mechanical extensometers provide useful informa-tion.1This test method is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved Dec.1,2015.Published December 2015.Originallyapproved 1958.
14、Last previous edition approved in 2015 as D1598 15.DOI:10.1520/D1598-15A2For 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 we
15、bsite.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Copyright by ASTM Intl(all rights reserved);Fri May 27 08:43:50 EDT 2016Downloaded/printed byUniversidad Pontificia Bol
16、ivariana(Universidad Pontificia Bolivariana)pursuant to License Agreement.No further reproductions authorized.5.Significance and Use5.1 The data obtained by this test method are useful forestablishing stress versus failure time relationships in a con-trolled environment from which the hydrostatic design basisfor plastic pipe materials can be computed.(Refer to TestMethod D2837 and Practice D2992.)5.2 In order to determine how plastics will perform as pipe,it is necessary to establish the stress-
