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' ,.A a ,r .:^..j-~mmim*m American Societv 0/ Heating and Ventilating Engineers Guide iggj grades of brass. The material to be used depends on the character service and the pressure. As in the case of pipe, there are several weights of fittings ma tured, designed to be used with pipe of corresponding grade. These"TM tions in Weights are known as (1) low-pressure fittings for steam pressures of 25 lb, (2) standard fittings for steam working pressur 125 lb, and extra heavy fittings for steam working pressures of 25ft The latter fittings are suitable for water working pressures of 350 lb are usually tested to twice the steam working pressure or 500 lb' hydrostatic. Table 5. Dimensions of Elbows for 125 Lb. Cast Iron Flanged Fittikcs k-A--1 l-L 1 *)0 DEG LOMG Radius deg. reducing s.dToS Chapter 21--Pipe, Fittings and Valves I Fi.tnfrinttzin* gs include nipples or short pieces of pipe of varying * ^couplings, usually of wrought iron only; elbows for turning angles IS is: a*5 deg or 90 deg; return bends, which may be of either the dose ol *er attem, and may be cast with either a back or side outlet; tees; 31 laterals'or Y branches; and a variety of plugs, bushings, caps, 5sses; flanges and redudng fittings. Reducing fittings as well as ioth of which are used in changing from one pipe size to another, - {be smaller connection tapped eccentrically to permit free drain"a. water 0f condensation in steam lines or free escape of air in j? 0 jjnes Reducing fittings as well as bushings, both of which are "iwfln changing from one pipe size to another, may have the smaller 'Section tapped eccentrically to permit free drainage of the water of Undensation in steam lines or free escape of air in water lines. Table 6. Dimensions of Welding Neck Flanges for Standard Pipe*> M- ^)X- Vi& Wde TX--.. r-i___ r All dimensions given in inches. Size of all fittings listed indicates nominal inside diameter of port. bRednting elbows and side outlet elbows carry same dimensions center to face as straight size elbow corresponding to the size of the larger opening. Special degree elbows, ranging from 1 to 45 deg., inclusive, have the same center to face dimension given in 45 deg. elbows and those over 45 deg. and up to 90 deg. inclusive, shall have the same center face dimensions given for 90 deg. elbows. The angle designation of an elbow is its deflection from stmign line flow and is the angle between the flange faces. dSide outlet elbows shall have all openings on intersecting center-lines. 326 Noiohal Pm Suh Dbsurq B Standard Pun 2 2% 3 4 5 6 8 10 12 14 0.D. 16 O.D. 18 O.D. 6 7. 7% 9 10 11 13% 16 19 21 23% 25 4% 5% 6 7% 8% 9% 11% 14% 17 18% 21 % 22% 4-- % 4- % 4- % 8- % 8- % 8- U 8- % 12- Vs 12- % 12-1 16-1 16-1% 2%6 2%2 3%6 4%2 5% 6 6%6 8 10 12 a a a % 1%6 % >%6 1 1% 1%6 1% 1% 1%6 1%6 AH dimensions given in inches. Orders or inquiries should specify diameter of bore "E" required. ^Copyright, 1929. by Heating und Piping Contractors National Association. 327 G 2% 2% 2% 3 3% 3% 4 4 4% 5 5 5% 2% 3 m Ws 5^6 6% s% 10% 12% 14% 6 16% 18%