1、Designation:D274913Standard Symbols forDimensions of Plastic Pipe Fittings1This standard is issued under the fixed designation D2749;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses in
2、dicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These symbols specify terminology for the dimensionsof pipe fittings made of plastic materials.It consists of a list ofletter designations with definitions,followe
3、d by drawings oftypical fittings,with the significant dimensions labeled inaccordance with these letter designations.2.Referenced Documents2.1 ASTM Standards:2F1498 Specification for Taper Pipe Threads 60 for Thermo-plastic Pipe and Fittings3.Letter Designations of Dimensions3.1 The letter designati
4、ons are defined as follows:A=socket entrance diameter,measured at intersectionof socket diameter and chamfer or radius,regardless of length“C”,B=socket bottom diameter,measured at intersectionof socket diameter and radius,C=socket depth,measured from socket entrance faceto socket bottom face,D=insid
5、e diameter of body,E=wall thickness of socket,min,F=wall thickness of body,G=intersection of socket center lines to socket bottom(center-to-socket bottom),90 elbows,tees,crosses,and shoulderon insert fittings;a laying length,H=intersection of socket center lines to end of fitting(center-to-end),90 e
6、lbows,tees,crosses;center to face,J=intersection of socket center lines to socket bottom(center-to-socket bottom),45 elbow;a laying length,K=intersection of socket center lines to end of fitting(center-to-end),45 elbow,L=length over-all,coupling,M=outside diameter of hub,N=socket bottom to socket bo
7、ttom or seat thickness(center stop thickness or pipe stop thickness),P=insert length,Q=distance or width across flat,R=height of head,S=length of male thread,includes pilot,T=length of female thread,includes pilot,V=root diameter of barbs,W=cap height,XA=male end of spigot at top,see Fig.1,XB=male e
8、nd of spigot at bottom,see Fig.1Y=length of barb section,Z=outside diameter of barbsCB=Pilot on the first thread of internal andexternal threaded fittings equal to12to34the width of the thread pitchas described in Specification F1498,Section 4.5 andFigures 2b and 2c.CM=length of male end,bushing,DJ=
9、inside diameter,major,bushing,EJ=wall thickness of socket,major,bushing;wall thickness of male end,bushing,EN=wall thickness of socket,minor,bushing,EW=radius on socket entrance,EX=thickness with 30 taper on socket entrance;30 entrance chamfer width,andEZ=thickness with 45 taper on socket entrance;4
10、5 entrance chamfer width.3.2 When there are two different values for one categoricaldimension on a fitting,the large one shall be designated withthe letter for that category followed by a J meaning major,andthe small one shall be designated by the same letter followedby an N meaning minor;for exampl
11、e,on a 45-deg Y-branch,there are two J dimensions,the longer one is designated as JJand the shorter one as JN.When there are more than twodifferent values for one categorical dimension,they are desig-nated with the proper letter followed by an arabic number;forexample,L1,L2,and L3 for the three leng
12、ths on a plasticadapter to connect plastic pipe to a cast iron hub.4.Illustrations4.1 Illustrations of typical fittings are shown in Figs.2-22.5.Keywords5.1 plastic pipe fitting;symbol definitions;symbols fordimensions1These symbols are under the jurisdiction of ASTM Committee F17 on PlasticPiping S
13、ystems and is the direct responsibility of Subcommittee F17.10 on Fittings.Current edition approved April 1,2013.Published April 2013.Originallyapproved in 1968.Last previous edition approved 2008 as D2749 02(2008).DOI:10.1520/D2749-13.2For referenced ASTM standards,visit the ASTM website,www.astm.o
14、rg,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 FIG.1 Reducer Bushin
15、gs-SocketFIG.2 Tapered SocketFIG.3 90 Elbow-SocketFIG.4 45 Elbow-SocketD2749 132 FIG.5 Tee-SocketFIG.6 Coupling-SocketFIG.7 90 Elbow-ThreadedFIG.8 45 Elbow-ThreadedFIG.9 Tee-ThreadedFIG.10 Cross-ThreadedFIG.11 Coupling-ThreadedFIG.12 Plug-ThreadedD2749 133 FIG.13 Cap-ThreadedFIG.14 Insert EndFIG.15
16、Insert ElbowFIG.16 Insert TeeFIG.17 Insert Adaptor,Male ThreadFIG.18 Insert Adaptor,Female ThreadFIG.19 Plastic AdapterFIG.20 Plastic HubFIG.21 Plastic AdapterD2749 134 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility
