Document MMZEYazjGbyjOVk54dOXBEYd9

American Society of Heating and Ventilating Engineers Guide, 1929 Chapter XXI--Pipe and Fittings corrosion under water, although under atmospheric exposure the influence of composition is sometimes more marked. In practice, oxygen removal has -been accomplished in two ways, namely; by de-aerating the water mechanically; and by fixing the free oxygen by chemical combination. Suitable apparatus is now being manufactured for this purpose. 346 11 Fig. 2. Standard Roughing-in Dimensions Angle Type Valves Sm or Valve w Ye V H4' lw i" Tolerance ADimension Steam and Hot Water Angle Valves and Union Elbows Effective Jan. 1,1926 23*" 23*" 3' 3H' 33*' 43*' . =*=34" ADimension Modulating Valves Effective Jan., 1, 1926 2%' 23*' 3' 336" 33*' .43*' ADimension - Return Line Vacuum Valves Effective Jan. 1.1925 334' The standardization of the Roughing-in Dimensions of Angle Steam and Hot Water.and Modulating Radiator Valves was made possible by the cooperation of the Manufacturers Standardization Society of the Valves and Fittings Industry. Tables 1 and 2 give the important physical properties of Standard and Extra Heavy Wrought Pipe. Copper and Brass Pipe Copper and brass tubing are commonly stocked and supplied in sizes varying from to 10 in. o. d. and in gages from 2 to 25 B. & S. and Stubbs. Copper and brass pipes are stocked and supplied in standard, extra heavy and double extra heavy iron pipe thicknesses and sizes. See Tables 1 and 2. Both tubing and piping are usually stocked in 12 ft. lengths, and can be obtained in lengths from 2 to 20 ft. or more if required. The serviceability and usefulness of brass piping is due principally to its inherent resistance to corrosion. For this reason it is used for boiler 347