1、Designation:D212216Standard Test Method forDetermining Dimensions of Thermoplastic Pipe andFittings1This standard is issued under the fixed designation D2122;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers the determination of diamete
3、r,wall thickness,and length dimensions of thermoplastic pipe.Included are procedures for measurement of the inside diam-eter of pipe intended to be joined by internal fittings,measure-ment of the average outside diameter for roundable pipe whereout-of-roundness is not of primary concern,out-of-round
4、nessmeasurement and measurement of the average outside diameterof non-roundable pipe,and for determining length and straight-ness.1.2 This test method also includes procedures for dimen-sioning molded thermoplastic pipe fittings.1.3 The values stated in inch-pound units are to be regardedas standard
5、.The values given in parentheses are mathematicalconversions to SI units that are 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 t
6、o establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD790 Test Methods for Flexural
7、Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsF412 Terminology Relating to Plastic Piping SystemsF1498 Specification for Taper Pipe Threads 60 for Thermo-plastic Pipe and Fittings2.2 ANSI Standard:3B 2.1 Pipe Threads(Except Dryseal)3.Terminology3.1 Definitions
8、:3.1.1 GeneralDefinitions are in accordance with Termi-nology F412,unless otherwise specified.3.1.2 deviation from straightnessthe maximum deviationfrom a straight line exhibited by a pipe specimen divided by thelength of the specimen.3.1.3 nonroundable pipepipe made from a material hav-ing a tensil
9、e or flexural modulus of elasticity of 150 000 psi(103 MPa)or greater,as determined by Test Method D638 orD790,and in addition,having an outside diameter/wall thick-ness ratio of less than 20.3.1.3.1 DiscussionThe above definitions apply to thermo-plastic pipe and are based on the ability or inabili
10、ty of a pipeto round out when forced into a tapered socket.3.1.4 roundable pipe(1)pipe made from material having atensile or flexural modulus of elasticity less than 150 000 psi(103 MPa)as determined by Test Method D638 or D790;and(2)pipe made from a material having a tensile or flexuralmodulus of e
11、lasticity of 150 000 psi(103 MPa)or greater,asdetermined by Test Method D638 or D790,and in addition,having an outside diameter/wall thickness ratio of 20 orgreater.3.1.5socket bottomthe point at which the pipe stopradius intersects wall.4.Summary of Test Method4.1 Alternate MethodsAlternate methods
12、 and proceduresfor obtaining dimensions(such as apparatus and proceduresusing laser,electronic,nuclear,ultrasonic,or other means)arenot prohibited.1This test method is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on Tes
13、tMethods.Current edition approved Nov.1,2016.Published November 2016.Originallyapproved in 1962.Last previous edition approved in 2015 as D2122 15.DOI:10.1520/D2122-162For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book
14、 of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright AST
15、M International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.1 The user of an alternate method shall validate thealternate method.The alternate method is validated when boththe product is measured according to the Apparatus andProcedure sections presented in t
16、his test method,and whenfound to be in compliance with product specifications.NOTE1Validation of the alternate method is a necessary step inensuring compliance with product specifications.Validation generallyinvolves statistical analysis of data generated using the alternate method.At a minimum,the analysis should include calculating 99%confidencelimits and verifying that these limits are within the product specificationtolerances.For guidance on this type of analysis,the user should consultthe
