Document 85Dn1pmRGg0VMzeLZeaRronyZ

316 Chapter 16 1945 Guide Table 7. American Standard Dimensions of Tees, Crosses5* (Straight Sizes), and Elbows for Class 125 Cast-Iron Flanged Fittings, A.S.A: B16a-1939 Tee Side outlet Cross . Pipe9 Fittings, Welding 317 embraces gas welding and electric arc welding, both of `which are com monly used to produce acceptable welds. ) Welding application requires the same basic knowledge of design as do' the other types of assembly, but in addition, requires a generous know ledge of the sciences involved, particularly as to welding qualities of metal, their reaction to extremely high temperatures, and the ability to determine and use only the best quality welding rods. This requirement applies equally to employer and employee with the employer accepting Table .8 American Standard Dimensions for Butt-Welding Elbows, Tees, Caps, and Lapped-Joint Stub Ends, A.S.A. B16.9-1940 Nominal Pipe Size*- A Center to. Face Tees, Crosses*-11 and Elbows ' AA Face to Face Tees and Crosses0-*1 i iA m 2 2A 3 34 A 5 6 8 10 12 14 O.D. 16 O.D. 18 O.D. 20 O.D. 24 O.D. 30 O.D. 36 O.D. 42 O.D. 48 O.D. 3A 3% 4 4A 5 5A 6 m PA 8 9 11 12 14 15 16A 18 22 25. 2831 34 7 7A 8. 9 10 11 12 13 15 16 18 22 24 28 30 33 36 44 50 56 62 68 Bc Center to Face Long Radius Elbow*-*** Center to * Face 45 Deo Elbow* DlAMETBB or Flange Thickness or Flange. Min. . Metal* Thickness or Body 5 5A 6 6A 7 7A 8A 9 ,10J HA 14 16A 19 21A 24 26A 29 34 , 41H 49. 56M 64 pa 2 2A 2A 3 3 3A 4 4A 5 5A 8A 7A 7A 8 8A 9A 11 15 .18 21 24 4A 4Vs 5 6 7 7A 8A . 9 10 11 13A . 16 19 21 23A 25 27 M 32 38M - 46 53 59M A. A %. % % A % % % l iA m IA P/s 1% - m m 2A 2A 2Vs At %, A* At At Vs . At *2 A At Vs . A % Vs l m. iA PA m Ws 2 All dimensions given in inches. `Crosses both straight and reducing sizes 18 in. and larger shall be reinforced to compensate for the inherentweakness in the casting design.. i>Size of all fittings listed indicates nominal inside diameter of port.' `Tees, side outlet tees, and crosses. 16 in. and smaller, reducing on the outlet, have the same dimensions center to face, and face to face as straight size fittings corresponding to the size of the larger opening. Sizes 18 in. and larger, reducing on the outlet, are made in two lengths, depending on the size of the outlet. dTees and crosses; reducing on run only, carry same dimensions center to face and face to face as a straight size fitting of the larger opening. Reducing elbows and side outlet elbows carry same dimensions center to face as straight size elbows corresponding to the size of the larger opening. ' (Special degree elbows, ranging from'l to 45 deg. inclusive.-have the same center to face dimensions as given for 45-deg elbows and those over 45 deg and up to 90 deg. inclusive, shall have the same center to face dimensions as given for 90-deg elbows. The angle designation of an elbow is its deflection from straight line flow and is the angle between the flange faces. *Side outlet elbows shall have all openings on intersecting center-lines. hBody thickness at no point shall be less than 87H per cent of the dimensions given in the table. Nominal Pipe Size Outside Diameter i iA m 2 2M 3 3A 4 5 6 8 10 12 1.315 1.660 1.900 2.375 2.875 3.500 4.000 4.500 5.563 6.625 8.625 10.750 12.760 Cbntbr-to-End 90-Deg Elbows A PA lVs 2A 3 3A 4H 5A 6 7A 9 12 15 18 45-Deg BElbOWB Vs i IVs PA PA 2 2A 2A 3 Ys 3A 5 6A 7A Of Run TCeme . iA m 2A 2A 3 3Vs 3A 4A 4A 5H 7 8A ' 10 CEabp-os iA 1A 1A iA iA 2 2A 2A 3 3A 4 5 6 Lapped-Joint Stub Ends Length 4 4 4 6 6 6 6 6 8 8 8 10 10 Radius of Finllet Vs He A As At Vs Vs At At A A A A Diam. of 2 2A 2% 34AH 5 5A 8At 7At 8A 10A 12A 15 AJ1 dimensions given in inches. , *The dimensions of welding tees cover those which have side outlets from one size less than half the size 01 the run-way opening of the tees to full size. ^Dimensions E and F are applicable only to these fittings in schedules up to and including Schedule 80. AS.A. Standard B36.10-1939. `The shape of these caps shall be ellipsoidal and shall conform to the requirements of the A 3.M.E. toiler Construction Code. dThis dimension is for standard machined facings in accordance with American Standard for Steel Pipe fr!^v,8es Hanged Fittings (AS.A. B16e-1939). The back face of the lap shall be machine to conform * t*ie surface of the flange on which it seats. Where ring joint facings are to be applied, use dimension K as given m A-S^4. B16e-1939.' all of the responsibility. Thus the employer should select his welding mechanics with good judgment, provide them with first-class equipment and tools, arrange for their training and use of acceptable workmanship standards, and at regular intervals subject their work to prescribed tests, km Stry not accePt the employment of mechanics of undetermined ability nor on the basis of past experience. Neither does industry accept the statement that a weld is only as good-as the workman who makes it. For piping which is to be operated at pressures in excess of 15 psi, rules or. fusion welding of pipe joints and the qualification of welders and , welding procedures as contained in the American Standard Code for ressure Piping should be observed. For pressures 15 psi or below, the oregoing rules or those set forth in the Standard Manual on Pipe Welding