Document mBLyJzzmZj3560JZBBLNbjJ0

570 CHAPTER 26 1950 Guide analysis of the pipe are the governing factors, not the working pressure. There are a number of safety codes which govem'the installation of welded piping'in many cities and states. Some of the more prominent are listed at the. end of this chapter4 -s, `. 1 s'-A complete line of manufactured4steel welding fittings is now available, Table 9.. American Standard Dimensions op Steed .Welding Neck and Slip-on Welding Flanges fob Steam Service Pressure Rating op 150 PSI (Gage) at a Temperature op 500 F, and 100 PSI (Gage) at 750 F, ASA B16e-1939 Pipe, Fittings, Welding 571 are included in the American Standard. : Larger sizes also are available in-some types of fittings. The welding bevel which is a straight 37|-deg V for wall thickness J in. and below, and a U-bevel for thicknesses heavier than | in.; conforms to the recommended practice of ASA Standard B16e-1939, American Standard for Steel Pipe Flanges and Flanged Fittings. The latter also contains dimensions for steel welding neck flanges for pressures..up to 2500 psi, and slip-on welding iflanges for 150 and 300 psi. Table 9 gives these dimensions for welding-neck and slip-on welding flanges suitable for 150 psi gage pressure.. Socket-welding fittings also are commercially available. These fittings have a machined, recess for4 inserting the pipe which is attached by a Table 10. American. Standard.. Dimensions op - Socket-Welding Elbows, Tees, Crosses, 45-Deo Elbows, and Couplings NoPmiinnal 8m H H i.IX 1)4 2 2)4 3 3)4 4 5 6 8 10 12 14 O.D. 16 O.D. 18 O.D. 20 O.D. 24 O.D. Diameter Thickness Diameter or M`omr . orFlakos Flo.* Hob BiaHob Diam. inning or .' Cbamtbb^* Length. Thro Hub* Inside Diam. or Pits 40Schedule Bobs or Slip-on Flanges Mm. Diam. or No. 8m - Bolt or . or Czbclb Bolts Bolts 0 Q ' x . .ff Y J 'W 3)4 314 4H 4% 5 .6 7 7X 8)4 9 10 11 13)4 16 19 21 23)4 25 27)4 32 % X %' % % % 14 % % % 1 1)4 ' m IX m : ImXn m m , 0.84 114 IX 1.05 2H, We 1.32 2%, 2Xe 1.66 2X 2% 1.90 m 3% . 2.38 2X 3% 2.88 2% 4X 3.50 2X 4% 4.00 . 2`X 55fe 4.50 3 6Ke 5.56 3X 7% 9>He 12 6.63 3X 8.63 4. .10.75 . 4 . mi 15X 12.75 4X 14.00 5 118914 16.00 18.00 5SX 22 20.00 5% 26X 24.00 6 0.62* 0.82* 1.05* 1.38* 1.61* 2.07*. 2.47* 3.07* 3.55* 4.03* 5.05* 6.07* - 7.98* . _10.02*_ To Be Specified. by Purchaser 0.88 1.09 : 1.38 1.72 1.97 2.44 2.94 3.56 4.06 4.56 5.66 6.72 8.72 10.88 12.88 . 14.19 16.19 .18.19. 20.19 24.19 2X 4 . X 2X 4 3X 4 4" H 3X 4 M 314 4 J4 4X 4 % 3X 4 % 6 7. "4 8 % X 7X 8 X 8X 8 x 9X S X 11X 8 X 14X 12 x 17 12 . 16X 12 1 21X 22J4 25 16 16 . 20 i lixM 29X 20 IX Ail dimensions given in inches. -. raised lace of -fa in. ia included in thickness offlange minimum and in length through hub. ^The outside surface of the welding end of the hub shall be straight or tapered at not mare thah 6 deg. - ^Dimensions H and J correspond to the outside and inside diameters of pipe as given in AM.A. B36.MK 1939, Schedule 40. . - "These diameters are identical with the diameters of what was formerly designated as Standard Weight Ptpe of the corresponding sizes. and a dimensional standard7 has been prepared under the procedure of the American Standards Association to unify heretofore divergent dimensions for the same type welding fittings as produced by different manufacturers. -Standard dimensions for steel butt-welding elbows, tees, caps, andlappedjoint stub ends' are given in Table 8. Dimensions for eccentric and con centric reducers, and 180-deg return bends are not shown in Table4 8,4 but fillet .weld between the pipe wall and socket .end. Use. of socket-welding fittings generally is restricted to nominal pipe sizes 3 in. and smaller, in which range commercial fittings are available. !. This type of fitting, has gained rapid acceptance owing to its ease of installation, low cost, and ability to make a pressure tight joint without weakening the pipe as is the case with threading.. Dimensions for socket-welding fittings in accord ance with ASA Standard B 16.11-1946 are given in Table, 10. . VALVES Valves are made with both,threaded and flanged ends for screwed, and bolted connections just, as. are pipe fittings. The material used for valves of small size is generally brass or bronze for low pressures and forged steel for high pressures, while in the larger