Document k9zpmjYDBaoEgLeqvzKGe4E7B

584 CHAPTER 26 1951 Guide analysis of the pipe are the governing factors, not 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 A complete line of manufactured steel welding fittings is now available, Table 9. American Standard Dimensions of 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 585 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 f in. and below, and a U-bevel for thicknesses heavier than 1 in., conforms to the recommended practice of ASA Standard B16e-1939, American Standard for Steel Pipe Manges 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, Crosses, 45-Deo Elbows, and Couplings Nominal PlPB Sub xx i IX IX 2 2X 3 3X 4 5 6 8 10 12 14 O.D. 16 O.D. 18 O.D. 20 O.D. 24 O.D. Diameter or Flange Thickness or Flo.* Min. Diameter or Hob Hub Diau. Begin nino or Chamfer1*-* Lsnotb Thru Hub* Inside Diam. or Pipe Schedule 40* O 0X Hr J 3X m 4K m 5 6 7 m m 9 10 ii 13X 16 19 21 23H 25 27JS 32 Xm X IX % I'Ve Vs 2H, "Hi 2% X 3!4 Vs 3% % iX % 4% m % 6Vs 1 7% 1 Ys 9% m 12 IX 14^ m 15J* m .18 m 19^ i% 22 IVs 26X 0.84 1.05 1.32 1.66 1.90 2.38 2.88 3.50 4.00 4.50 5.56 6.63 8.63 10.75 12.75 14.00 16.00 18.00 20.00 24.00 vA 2'A 2% 2X 2'Ms 2X 2X 2 >4 2% 3 3X 3X 4 4 4X 5 5 m 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 \ Bore or Sup-on Flanges Min. Diaal of No. Size Bolt or . of Circle Bolts Bolts W 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 2>A 2X 3X &x m 4X sx 6 7 m 8X m n>4 14X 17 18K 21X 22 K 25 29H 4X 4X 4X 4X 4X 4% 4% 4 Vs 8% 8% 8X 8X 8X 12 12 Vks 12 i 16 i 16 IX 20 m 20 IX All dimensions given in inches. A raised face of & in. is included in thiehneae ojflange minimum and in length through hub. t>The outside surface of the welding end of the hub shall be straight or tapered at not more than 6 deg. "Dimensions B and J correspond to the outside and inside diameters of pipe as given in ASA B36.1Q1939, 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, tees, 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 All dimensions are given in inches. "Dimension C is 1J times the nominal pipe thickness, minimum, but not 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 10.8 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