1、ASTM D27L)87 m 0757530 0027034 7=/-(Tb Designation:D 2740-89 AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race St.,Philadelphia,Pa.i9103 Reprinted from the Annual Book of ASTM Sfandards.Copyright ASTM If not listed in the currentcombined index.will appear in the next edition.Standard Specificatio
2、n for Poly(Viny1 Chloride)(PWC)Plastic Tubing This standard is issued under the fixed designation D 2740;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parenthem indicates the year of last reap
3、proval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope 1.1 This specification covers poly(viny1 chloride)(PVC)tubing pressure rated for water(Appendix).Included are criteria for classifying PVC plastic tubing materials and PVC plastic tubing,and re
4、quirements and test methods for materials,workmanship,dimensions,sustained pressure,burst pressure,flattening,and extrusion quality.Methods of marking are also given.1.2 The values in parentheses are for information pur-poses only.1.3 The following safety hazards caveat pertains only to the test met
5、hod portion,Section 7,of this specification.This standard may involve hazardous materials,operations,and equipment.This standard does not purport to address all of the safety problems associated with its use.Il is the responsi-bility of the user of this standard to establish appropriate safity and h
6、ealth practices and determine the applicability o f regulatory limitations prior to use.2.Referenced Documents 2.1 ASTM Standards:D 6 18 Methods of Conditioning Plastics and Electrical D 883 Definitions of Terms Relating to Plastics2i3 D 1598 Test Method for Time-to-Failure of Plastic Pipe D 1599 Te
7、st Method for Short-Time HydrauIic Failure D i 600 Abbreviations of Terms Relating to D 1784 Specification for Rigid Poly(Viny1 Chloride)(PVC)Compounds and Chlorinated Poly(Viny1 Chlo-ride)(CPVC)Compounds3 D 2 122 Test Method of Determining Dimensions of Ther-moplastic Pipe and Fittings D2152 Test M
8、ethod for Degree of Fusion of Extruded Poly(Viny1 Chloride)(PVC)Pipe and Molded Fittings by Acetone Immersion3 D 2837 Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials3 Insulating Materials for Testing2 Under Constant Internal Pressure3 Pressure of Plastic Pipe,Tubi
9、ng,and Fittings3 I This specification is under the jurisdiction of ASTM Committee F-17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.25 on(Vinyl Based)Pipe.Current edition approved Feb.24,1989.Published May 1989.Onginally published as D 2740-68.Last previous edition
10、D 2740-88.Annual Book ofASTM Standards,Vol 08.01.Anniral Book o f ASTM Slandards,Vol 08.04.F 412 Definitions of Terms Relating to Plastic Piping Systems3 2.2 NSF Standard:Standard No.14 for Plastic Piping Components and Related Materials4 3,Definitions 3.1 General-Definitions are in accordance with
11、Defini-tions D 883 or F 412 and abbreviations are in accordance with Abbreviations D 1600,unless otherwise indicated.The abbreviation for poly(viny1 chloride)plastic is PVC.3.2 hydrostatic design stress-the estimated maximum tensile stress in the wall of the tubing in the circumferential orientation
12、 due to internal hydrostatic water pressure that can be applied continuously with a high degree of certainty that failure of the tubing will not occur.3.3 pressure rating(PR)-the estimated maximum pres-sure that water in the tubing can exert continuously with a high degree of certainty that failure
13、of the tubing will not occur,3.4 relation bet ween dimensions,hydrostatic design stress,and pressure rating-the following expression,commonly known as the IS0 eqation,is used in this specification to relate dimensions,hydrostatic design stress,and pressure rating:2SJP=(Dd)-1 2SJP=R-1 where:S=hydrost
14、atic design stress,MPa(or psi),P=pressure rating,MPa(or psi),Do=average outside diameter,mm(or in.),t=minimum wall thickness,mm(or in-),and R=standard thermoplastic pipe dimension ratio(Do/t for 3.5 standard dimension ratio(SDR)-the average outside diameter in inches divided by the minimum wall thic
15、kness in inches,rounded to the nearest 0.5 3.6 standard thermoplastic tubing materials designation code-the tubing materials designation code shall consist of the abbreviation PVC for the type of plastic,followed by the ASTM type and grade in Arabic numerals and the hydro-static design stress in uni
16、ts of 100 psi with any decimal figures dropped.Where the hydrostatic design code contains less than two figures,a cipher shall be used before the number.Thus a complete material code consists of three PVC tubing).4Available from the National Sanitation Foundation,P.O.Box 1468,Ann See IS0 R161-1960,Pipes-of Plastics Materiais for tke Transport of Fluids Arbor,MI 48106.(Outside Diameters and Nominal Pressures)Part I,Metric Sera.1/-p.NOTICE:This standard has either been superseded and replaced by a
