1、Designation:F149808(Reapproved 2012)1Standard Specification forTaper Pipe Threads 60 for Thermoplastic Pipe and Fittings1This standard is issued under the fixed designation F1498;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the ye
2、ar 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.1NOTESection 4.8 and Note 3 were editorially corrected in November 2012.1.Scope*1.1 This specification establishes requirements
3、for dimen-sions and gaging of taper pipe threads used on threaded plasticpipe and fittings.1.2 Threads meeting this specification shall only be used onthose plastic materials deemed suitable by the manufacturer.1.3 Specialty threads or threads not requiring a leak-tightjoint are not covered in this
4、specification.NOTE1The terms“wrench makeup”and“wrench tight”are standardterminology for tightness and do not imply using a pipe wrench or othertools which would damage plastic pipe and fittings.The terms“hand-tight”and“hand-tight engagement”refer only to thread gaging(not pipeand fitting connections
5、)and is the definition of the L1gage length.1.4 Thread DesignationsThe type of pipe threads includedin this specification are designated by specifying in sequencethe nominal pipe size,number of threads per inch,and thethread series symbols as follows in accordance with ANSI/ASME B 1.20.1:38-18 NPT.F
6、or left-hand threads add LH tothe end of the designation,otherwise right-hand threads will beunderstood.For example:38-18 NPT-LH.1.4.1 Each of these letters in the symbol has a definitesignificance as follows:N=National(American Standard)P=PipeT=Taper1.5 The values stated in inch-pound units are to
7、be regardedas the standard.No other units of measurement are included inthis standard.1.6 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
8、determine the applica-bility of regulatory limitations prior to use.For specificprecautionary statements,see 7.2.1 and 8.3.2.Referenced Documents2.1 ASTM Standards:2D1600 Terminology forAbbreviated Terms Relating to Plas-ticsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsF4
9、12 Terminology Relating to Plastic Piping Systems2.2 ASME Standards:3B 1.20.1 Pipe Threads,General Purpose(inch)B 1.7 Nomenclature,Definitions and Letter Symbols forScrew Threads3B 47.1 Gage Blanks3.Terminology3.1 Terminology is in accordance with Terminology F412and abbreviations are in accordance
10、with Terminology D1600,unless otherwise indicated.3.2 Nomenclature,definitions,and letter symbols for screwthreads are in accordance with ASME/ANSI B 1.7.4.American National Standard Taper Pipe Thread Form4.1 Thread FormThe form of thread profile specified inthis specification shall be known as the
11、American NationalStandard Taper Pipe Thread Form.The relations as specifiedherein,for form of thread and general notations are shown inFig.1.4.2 Angle of ThreadThe angle between the sides of thethread is 60 when measured in an axial plane.The linebisecting this angle is perpendicular to the axis.4.3
12、 Truncation and Thread HeightThe height of the sharpV thread,H,is as follows:H 5 0.866025p 5 0.866025/n(1)where:1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.Current edition approved Se
13、pt.15,2012.Published November 2012.Originallyapproved in 1994.Last previous edition approved in 2008 as F1498 08.DOI:10.1520/F1498-08R12E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume in
14、formation,refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990,http:/www.asme.org.*A Summary of Changes section appears at the end of this standardCopyright
15、 ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 p=pitch of thread,andn=threads per inch.4.3.1 The basic maximum height of the truncated thread,h(see Fig.1)is based on factors entering into the manufacture ofcutting tools and the making of tight jo
16、ints.h 5 0.800p 5 0.800/n(2)The crest and root of pipe threads are truncated a minimumof 0.033p.Maximum truncation for the crest and root of thesepipe threads is in Table 1.The crests and roots of the externaland internal threads may be truncated either parallel to thepitch line or parallel to the axis.The sketches in Tables 2-6 givea sectional view of this standard thread form,which representsH=0.866025p=height of 60 sharp V thread=1 47 min.=thread taper angle for116taperh=0.800000p=height of t
