1、Designation: 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 revision, the year of last
2、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 dimensionsof pipe fittings made of plastic materials. It consists of a list oflet
3、ter designations with definitions, followed 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 Desig
4、nations 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,C = socket depth, measured
5、 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 fittings; a laying length,H = in
6、tersection 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 fitting(center-to-end), 45 elbow
7、,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 = length of female thread,i
8、ncludes 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 barbsCB = Pilot on the first thread of internal andexternal threaded fittings equal to12 to34 the width o
9、f 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 thickness of socket, minor, bushing,EW = radius on
10、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 categoricaldimension on a fitting, the large one shall be designated withthe letter
11、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 example, 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 val
12、ues 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 lengths 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
13、. Keywords5.1 plastic pipe fitting; symbol definitions; symbols fordimensions1These symbols are under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.Current edition approved April 1, 2013. Published April 2013. Orig
14、inallyapproved 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.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Do
15、cument Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on
16、 Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1FIG. 1 Reducer Bushings-SocketFIG. 2 Tapered SocketFIG. 3 90 Elbow-SocketFIG. 4 45 Elbow-SocketD2749 132FIG. 5 Tee-SocketFIG. 6 Co
17、upling-SocketFIG. 7 90 Elbow-ThreadedFIG. 8 45 Elbow-ThreadedFIG. 9 Tee-ThreadedFIG. 10 Cross-ThreadedFIG. 11 Coupling-ThreadedFIG. 12 Plug-ThreadedD2749 133FIG. 13 Cap-ThreadedFIG. 14 Insert EndFIG. 15 Insert ElbowFIG. 16 Insert TeeFIG. 17 Insert Adaptor, Male ThreadFIG. 18 Insert Adaptor, Female T
18、hreadFIG. 19 Plastic AdapterFIG. 20 Plastic HubFIG. 21 Plastic AdapterD2749 134ASTM 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 vali
19、dity of any such patent rights, 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 comm
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21、not received a fair hearing you 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 c
22、opies) of this standard may be obtained 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 22 Plastic HubD2749 135
