1、Designation: D2749 02 (Reapproved 2008)D2749 13 An American National StandardStandard 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 r
2、evision, the year 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.1. Scope1.1 These symbols specify terminology for the dimensions of pipe fittings made of plastic materials.
3、It consists of a list of letterdesignations with definitions, followed by drawings of typical fittings, with the significant dimensions labeled in accordance withthese letter designations.2. Referenced Documents2.1 ASTM Standards:2F1498 Specification for Taper Pipe Threads 60 for Thermoplastic Pipe
4、and Fittings3. Letter Designations of Dimensions3.1 The letter designations 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
5、,C = socket depth, measured from socket entrance faceto socket bottom face,D = inside 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 fitti
6、ngs; a laying length,H = intersection of socket center lines to end of fitting(center-to-end), 90 elbows, 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 fitti
7、ng(center-to-end), 45 elbow,L = length over-all, coupling,M = outside diameter of hub,N = socket bottom to socket bottom 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
8、= 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 end of spigot at bottom, see Fig. 1Y = length of barb section,Z = outside diameter of barbs1 These symbols are under the jurisdiction of ASTM Committee F17 on Plast
9、ic Piping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.Current edition approved Nov. 1, 2008April 1, 2013. Published February 2009April 2013. Originally approved in 1968. Last previous edition approved 20022008 asD2749 02.D2749 02(2008). DOI: 10.1520/D2749-02R08.10.152
10、0/D2749-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is inten
11、ded only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the curren
12、t versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1CB = counterbore onthreaded fittings, optional,CB = Pilot on the first thread of internal andexter
13、nal threaded fittings equal to12 to 34 the width of the thread pitchas described in Specification F1498,Section 4.5 andFigures 2b and 2c.CM = length of male end, bushing,DJ = inside diameter, major, bushing,EJ = wall thickness of socket, major, bushing;wall thickness of male end, bushing,EN = wall t
14、hickness 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;45 entrance chamfer width.3.2 When there are two different values for one categorical dimension on a fitting
15、, the large one shall be designated with theletter for that category followed by a J meaning major, and the small one shall be designated by the same letter followed by anN meaning minor; for example, on a 45-degY-branch, there are two J dimensions, the longer one is designated as JJ and the shorter
16、one as JN. When there are more than two different values for one categorical dimension, they are designated with the proper letterfollowed by an arabic number; for example, L1, L2, and L3 for the three lengths on a plastic adapter to connect plastic pipe toa cast iron hub.4. Illustrations4.1 Illustr
17、ations of typical fittings are shown in Figs. 2-22.5. Keywords5.1 plastic pipe fitting; symbol definitions; symbols for dimensionsFIG. 1 Reducer Bushings-SocketD2749 132FIG. 2 Tapered SocketFIG. 3 90 Elbow-SocketFIG. 4 45 Elbow-SocketFIG. 5 Tee-SocketD2749 133FIG. 6 Coupling-SocketFIG. 7 90 Elbow-Th
18、readedFIG. 8 45 Elbow-ThreadedFIG. 9 Tee-ThreadedFIG. 10 Cross-ThreadedFIG. 11 Coupling-ThreadedFIG. 12 Plug-ThreadedFIG. 13 Cap-ThreadedFIG. 14 Insert EndD2749 134FIG. 15 Insert ElbowFIG. 16 Insert TeeFIG. 17 Insert Adaptor, Male ThreadFIG. 18 Insert Adaptor, Female ThreadFIG. 19 Plastic AdapterFIG
19、. 20 Plastic HubFIG. 21 Plastic AdapterD2749 135ASTM 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,
20、 and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn.Your comments are invited either for revi
21、sion of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you
22、shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be o
23、btained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 22 Plastic HubD2749 136
