Document M4NxDa1O61X6Ob7K813kekZwM

HEATING VENTILATING AIR CONDITIONING GUIDE 1940 be included in the American Standard. Larger sizes also are available in some types of fittings. The welding bevel which is a straight 3734-deg V for wall thicknesses % in. and below, and a U-bevel for thicknesses heavier than % in., conforms to the recommended practice of .45.4 Standard B16e-1939, American Standard for Steel Pipe Flanges and Flanged Fittings. The latter also contains dimensions for steel weldingneck flanges for pressures up to 2500 lb per square inch. Tables 11 and 12 give these dimensions for welding-neck flanges suitable for 150 and 300 lb per square inch gage pressure. Socket welding fittings are also commercially available. These fittings have a machined recess into which the pipe slips. A fillet weld between the pipe and socket edge provides a pressure-tight joint. This type of fitting has gained rapid acceptance due 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. Standard dimensions for socket welding fittings are being formulated under the procedure of the American Standards Association. Table 10. Proposed American Standard Dimensions for Butt-Welding Elbows, Tees, Caps, and Lapped-Joint Stub Ends Nominal Pipe Size Outside Diameter i IK .m 2. 2K 3 3K 4 5 6 8 10 12 1.315 1.660 1.900 2.375 2.875 3.500 4.000 4.500 5.563 6.625 8.625 10.750 12.750 Centeb-to-End 90-Deg Elbows A- IK IK 2K 3 m 4K 5M 6 7K 9 12 15 18 45-Deg Elbows B k i IK IK IK 2 2K 2K . 3K 3M 5 6K 7K Of Run Tee Ca IK IK 2K 2K 3 3K 3K 4K 4K 5K 7 8K 10 Caps 2Jb-e IK IK IK IK IK 2 2K 2K 3 3K 4 5 6 Lapped-Joint Stub Ends Loigth 4 4 4 6 6 6 6 6 8 8 8 10 10 Radius of Fillet R K Me K Me Me K K 6 Me K K K K Plain, of Lap Gd 2 2K 2K 3K 4K 5 5K 6Me 7Me 8K 10K 12K 15 All dimensions given in inches. The dimensions of welding tees cover those which have side outlets from one size less than half the size of the run-way opening of the tees to full size. .bDimensions E and F are applicable only to these fittings in schedules up to and including Schedule 80, ASA Standard B36.10-1939. oThe shape of these caps shall be ellipsoidal and shall conform to the requirements of the ASME Boiler Construction Code. dThis dimension is for a regular lapped joint in accordance with ASA Standard B16e-1939.. For ringjoint facing dimensions, see B16e-1939. 342 CHAPTER 18. PIPE, FITTINGS, WELDING 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 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 Table 11. American Standard Dimensions of Steel Welding Neck Flanges for Steam Service Pressure Rating of 150 Lb per Sq In. (Gage) at a Temperature of 500 F, and 100 Lb per Sq In. (Gage) at 750 F Nominal Pipe Size K M 1 iK i iK 2 2K 3 3K 4 5 6 8! 10 1 121 1450D 16IOD 18.0D 20]OD 24 OD Diameteh OF Flange Thickness op op Flo.a Min. Diameter op Hub Hub Diam. Beginning op CHAMPBRb* Length Thru Hub* Inside Diam. op Pipe Schedule 40 0 3K 3K 4K 4K 5 6 7 7K 8K 9 10 11 13K 16 19 21 23 K 25 27K 32 QX Me K Me Ms lMe K K 'Me 'Me 'Me 'Me 1 IK IKe IK IK 1 Me lMe l'Me IK 1 Me IK 1 'Me 2Me 2Me 3Ke 3Ke 4K 4% 5Me 6Me 7Me 9'Me 12 14K 15K 18 19K 22 26K 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 YJ IK 2Kfi 2Me 2K 2Me 2K 2K 0.62* 0.82* 1.05* 1.38* 1.61* 2.07* 2.47* 2M 2 'Me 3 3.07* 3.55* 4.03* 3K 5.05* 3K 6.07* 4 7.98* 4 10.02* 4K 5 To Be 5 Specified 5K by S'Me Purchaser 6 Diam. op. Bolt Circle No. op Bolts 2K 2K 3K 3K 3K 4K 5K 6 7 7K ' 8K 9K 11K 14M 17 18K 21K 22M 25 29K 4 4 4 4 4 4 4 4 8 8 8 8 8 12 12 12 16 16 20 20 Size op Bolts K K K K K Ms Ms Ms Ms Ms U .K K ,K K 1. 1 iK IK IK All dimensions given in inches. A raised face of !4 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 ASA B36.10- 1939, Schedule 40. , *These diameters are identical with the diameters of what was formerly designated as Standard WeigfJ Pipe of the corresponding sizes. 343