Document nmrxBwKbvz900yZzoed7E63d2

616 CHAPTER 27 1953 Guide' pipe are the governing factors', hot the working pressure. There are a number .of safety codes which govern the installation of welded piping in many cities and states. Some of the more prominent are listed at' the end of this chapter.4'6'6 * A complete1 line of manufactured steel welding fittings is,now available, 'V Table .9. American Standard Dimensions op Steel'Welding Neck and Slip-on Welding Flanges for Steam Service Pressure Rating of 150 PSI (Gage) at a Temperature of 500 F, and 100 PSI (Gage) at 750 F, ASA B16e-1939 Pipe, Fittings, Welding 617 are included in the American Standard. Larger sizes also'are'available in some types of fittings. The welding bevel which is a sti:aight-37^-deg V for wall thickness f in. and below, and a U-bevel for thicknesses heavier than f 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 flanges 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 for inserting the pipe which is attached by a Table 10. American Standard Dimensions of Socket-Welding Elbows, Tees, Cbosses, 45-Deg Elbows, and Couplings Nominal Pips Sin % % l i% 1% 2 2% 3 3% 4 5 6 8 10 12 14 0.D. 16 O.D. 18 O.D. 20 O.D. 24 O.D; Diameter OP Flange Thickness op Flo.* Mm. Diameter op Hub Hub Diam. Bbginnino op Chamfer*'* Lbnotb Thru Hub 0 0X BY Inside Diam. or Pipe- SCHEDULE 400 / Borb op Slip-on Flanges Mm. Diam. op No. Sm Bolt op . OP Circle Bolts Bolts W. 3% 3% 4% 4% 5 6 7 7% 8% 9 10 11 13% 16 19 21 23% 25 27% 32 % m 0.84 X IX 1.05 % Wo 1.32 X 2% 1.66 % .2% X 3*5 1.90 2.38 % 3% % 4X 2.88 3.50 % 4% 4.00 % 5% 4.50 % . m . 5.56 1 . 7% 6.63 1% Wo 8.63 m 12 10.75 IX 14*6 12.75 m 15X 14.00 1%6 18 16.00 m 19% i% 22 18.00 20.00 1% 26% 24.00 i% 2% 2% 2% 2%o 2% 2% 2X 2>% 3 3% 3% 4 4 4% 5 5 5% 5% 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 j. 4.06 4.56 5.66 6.72 8.72 10.88 12.88 14.19 16.19 .18.19 20.19 24.19 2% 2X 3% 3% 3% 4X 5% 6 7 7% 8% 9% 11% 14% 17 18% 21% 22% 25 29% 4 4 4 4 4 4 4 4 8 8 8 8 8 12 12 12 16 16 20 20 u zi Mr 22 x X X X X X X X % 1 1 1% 1% 1% All dimensions given in inches. a A raised face of Ha in. is included in thickness of flange minimum and in length through hub. b The outside surface of the welding end of the hub shall be straight or tapered at not more than 6 deg. 0 Dimensions H and J correspond to the outside and inside diameters of pipe as given in ASA B36.101939, Schedule 40. These diameters are identical with the diameters of what was formerly designated as Standard Weight Pipe 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, teels, caps, and lappedjoint stub ends are given in Table 8. ' Dimensions for eccentric and con centric reducers, and 180-deg return bends are not shown in Table 8, but Sched. 160 i 8ched. 40 i Sched. 160 Sched. 40 Sohed. 80 Center to Bottom or Socket Nom inal Pipe Size Mini mum Depth . OF Socket 90-Deg Ells, Tees, . Crosses _;oo I48 45-Deg Ells s 8 Ss .03 A. A ; 'P ^a 091 1 Minimum Socket ' Wall Thickness . Coup lings Dis tance ' Be tween Bottom Sockets Bore Dia meter of Socket, Mini mum CAoQ e" B C" Bore Diameter of Fittings CO T3 CO D H H U* w, H 0.420 0.125 0.125 0.269 0.216 H% H 0.555 0.125 0.149 0.364 0.302 HH He H 0.690 0.125 0.158 0.493 0.423 hH H H Mo H 0.855 0.136 0.184 0.234 0.622. 0.646 0.466 H y> 1M U H 1VU V4 Me Mo 'Mo M M. 1.065 1.141 0.193 0.273 0.824 0.742 0.614 1.330 0.166 0.224 0.313 1.049 0.957 0.816 H IMrt 1H lH 'Mo a 1.675 0.175 0.239 0.313 1.380' 1.278 1.160 m H mm iMo 1 H 1.915 0.181 0.250 0.351 1.610. 1.500 i.338 2 H 1H m 1 m H H 1H 2H 1H 1M H 2.406 0.193 0.273 0.429 2.067 .1.939 1.689 2.906 0.254 0.345 0.469 2.469` 2.323 2.126 3 H 2H m m 1H 3.635 0.270 0.375 0.646 3.088 2.900 2.626 All dimensions are given in inches. * Dimension C is 1J timaa the nominal pipe thickness, minimum, but not less than H in.' . Reducing sizes have same center to bottom of socket dimension as the largest size of reducing fitting. 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. B16.11-1946, are given in Table 10'.g 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