Document 2R5RkKoE5bLXzeGngOw4jpk3r

524 CHAPTER 27 1948 Guide are included in the American Standard. Larger sizes also are available in some types of fittings. The welding bevel which is a straight 37 J4-deg V for wall thickness % in. and below, and a U-bevel for thicknesses heavier than % in., conforms to the recommended practice of A.S.A. 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, /4.S./4. B16e-1939 Nominal 'Pipe . Size 54 54 l 154 154 2 254 3 354 4 5 6 8 10 12 14 O.D. 16 O.D. 18 O.D. 20 O.D. 24 O.D. Diameter 07 Flange Thickness 07 Flo. Min.- Diameter .07 Hub 0eX 354 354 454 454 5 6 7 754 854 9 10 11 1354 16 . 19 21 2354 25 2754 32 56 156 -54 154 56 1*56 54 256 *56 256 54 356 54 356 >56 454 *56 4*56 *56 556 *56 656 l 756 154 9*56 156 12 154 .1454 154 1554 156 18 m 1954 1% 22 154 , 2654 Hub Diau. Beginninq 07 Champer^-* H 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 Length Thru Hub* Y 154 256 256 254 256 254' 254 254 2*56 3 354 354 4 4 454 5 5 554 5*56 6 INSIDS DlAM. OP PlPB Schedule 40 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 Slip-on Flanges .Min. 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 Diau. or Bolt Circle 2% 2% 354 3/4 3 54 454 554 6 7 m 854 914 1154 1454 17 1854 2154 2254 25 2954 Size or Bolts 54 54 54 54 54 % 54 54 54 54 54 54 54 54 54 l l 154 154 154 All dimensions given is inches. A raised face of 16 in- is included in thickness of flange minimum and in length through hub. bThe outside surface of the welding end of the hub shall be straight or tapered at not more than 6 deg. Dimensions H and J correspond to the outside and inside diameters of pipe as given in A-S.A. B36.10- 1939. Schedule 40. . These diameters are identical with the diameters of what was formerly designated as Standard Weight Pipe of the corresponding sizes. 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 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 Pipe, Fittings, Welding 525 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 as. offered by most manufacturers of the product 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 Table 10. Proposed American Standard. Dimensions of Socket-Welding Elbows, Tees, Crosses, 45-Deg Elbows, and Couplings Nominal Pipe 8m orCenter to Bottom Socket Couplings . Bobs Minimum 90-Deg Gila, Depth Tees, Crosses 43-Deg Ella 07 Socket Sched. Sched. Sched. Sched. 40 4 80 160 40460 160 Distance Between Bottom Sockets Diameter op Socket, Minimum Minimum Socket Wall Thickness Sched. Sched. Sched. 40 80 160 Bore Diameter op Fittings Sched. Sched. Sched. 40 80 160 A A E B . C* D X X X lX \X IX 2 2X 3 H% X X 0.355 X% X X 0.690 X X X X X X X X X XH. HX IX X X X X X % ix ix % % ix iX ix IX IX 1% JM 1 m IX 2X ZX tX ix H X H X X H X X 0.855 1.065 1.330 1.675 1.615 2.406 2.906 3-535 0.156 0.156 0.166 0.175 0.181 0193 0.254 0.270 0.184 0.193 0.224 0.239 0.250 0.273 0.345 0.375 0.234 0.273 0.313 0313 0.351 0.429 0.469 0.546 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 0.546 0.742 0.957 1.278 1.500 1.939 2423 2J00 0.466 0.614 0.815 U60 1.338 L689 3.125 2X26 AS dimensions are given in inches. Dimension C is IX times the nominal pipe thickness, minimum, but not less than % in* Reducing sizes have same center to bottom of socket dimension as the largest size of reducing fitting. sizes either cast-iron, cast-steel or some of the steel alloys are employed. Practically all iron or steel valves intended for steam or water work are bronze-mounted or trimmed. . Brass, bronze, and iron valves are generally designed for standard or extra heavy service, the former being used up to 125 lb and the latter up to 250 lb saturated steam working pressure, although most manufacturers Also make valves for medium pressure up to 175 lb steam working pres sure. The more common types are gate valves or straightway valves, globe valves, angle valves, check valves and automatic valves, such as reducing and back-pressure valves. Gate valves are the most frequently used of all valves since in their open position the resistance to flow is a minimum, but they should not be used where it is desired to throttle the flow; globe valves should be used for this purpose. Gate valves may be secured with either a rising or a non-