Document 91NrgQxy912nwjoBYVYko5N95

. 318 ______ :_____ ' Chapter 16 ______ ` 1945 Guide 'i\ of the'Heating,'Piping and Atr Conditioning Contractors National Associa tion should be followed to insure a satisfactory welded joint. A complete line of manufactured steel welding fittings is now available and a dimensional standard has. been prepared under the procedure of the 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, A.S.-d. B16P-1939 Pipe, Fittings, Welding " ' ' . _________ 319 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 socketswelding fittings generally is restricted to nominal pipe sizes 3 in. and smaller in which range commercial fittings are available. This type of fitting has Table 10. Proposed American Standard Dimensions of Socket-Welding Elbows, Tees, Crosses, 45-Deg Elbows, and Couplings Nominal Pipe ' Size H' 14 l 1M V/i 2 V/t 3 334 4 5 6 8 10 12 14 O.D. 16 O.D. 18 O.D. 20 O.D. 24 O.D. Dumstbb Thickness OF OF Flg. Flange Min. Diameter OF Hub Hub Diam. Beginning of Chamfer1*-* Length Thru Hub* Inside Diam. of Pipe Schedule 40 \ 0 <? X 3Y J 334 m 4M 414 5 6 7 734 m 9 10 11 T334 16 19 21 2334 25 2734 32 % 14 % Vs % 14 Vs %. % % % 1 U4 m 134 114 m m i% 114 m 114 i% 2% 2% 3% 3% 4)4 4% 554 614 754 9*14 12 1414 1554 18 1914 22 2634 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 24.00 114 214 214 234 214 234 214 214 2*14' 3 314 314 4 4 434 5 5 514 5*34 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 of Slip-on Flanges Min. Diam. of No.' Snot Bolt OF 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.i9 18.19 -20.19 24.19 214 214 334 334 314 454 534 6 7 734 834 934 1114 1434 17 1814 2134 2214 25 2934 i4 4 /i44 " - 4 34 4 14 2? 4 }4- 4 Vi J- : 4 54 if? 4 14 ,{ 8 54 8 ' Vi. % 8 14 ft 8 14 8 14. f 12 14 12 M ,f 12 1 16 i- m 16 114 20 114 .# 20 ix# All dimensions given in inches*A raised face of in. is included in thickness of flange minimum and in length,through hub. bXhe 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. B3B.10* 1939. Schedule 40. These diameters .are identical with the diameters of what was formerly designated as Standard Weight Pipe of the corresponding sizes.' -V- 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 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. Nominal Pipe Size Minimum Depth of Socket Center to Bottom of Socket 90-Deg Eaifl, Tees, Crosses 45-Deg EUa Scbed. Scbed. Sohed. Scbed. 40 A 80 160 40*80 160 Couplings Bore Distance Diameter Between of Bottom Socket, Sockets Minimum Minimum Socket Wall Thickness Scbed. Scbed. Scbed. 40,, 80 160 Bore Diameter of . - FrmNS8 Scbed. Sched. Scbed. 40 80 160 A A Bb C D X M% *6 K 0.555 0.156 0.156 H H H 1 ~2 X X H H X n N H % Xh XH m 1)4 iffIlf i% 2K 2X x X 0.690 % H X 0.855 X K X 1365 % ** X 1330 %. X 1.675 1 X 1315 i m X 2.406 w X . 2.606 IX IX . X 3335 0.156 0.156 0.156 0.166 0.175 0.181 0.193 0.254 0.270 0.158 0.184 0.193 0.224 0.239 0350 0373 0345 0375 0334 0373 0313 0313 0351 0.429 0.469 0346 0.493 0.622 0324 1.049 1380' 1310 2367 2.466 3368 0.423 0346 0.742 0.957 1378 1300 1.939 2323 2300 0.466 0.614 0315 1.160 1338 1389 2.125 2.626 All dimensions are given in inches. Dimension C is 1 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. 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 pr bronze .r low pressures and forged steel for high pressures, while in the larger sizes either cast-iron, cast-steel or some of the steel alloys are employed. Tactically 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.