Document ganveeVey1bqy4KDajNVR9xYL

American Society of Heating and Ventilating Engineers Guide, 1924-25 Brass pipe lends itself to economy in the labor costs of installation. It can be readily cut, bent, threaded and otherwise machined. At screw joints the threads do not corrode out at the roots and cause leaks, and such joints can, if necessity arises, be remade without injury to the pipe. If a building equipped with brass piping is torn down, the old piping and fittings can be used again or sold for a high scrap value. The accompanying Table 91 gives weights and sizes for copper and brass tubing, in iron pipe sizes. 160 Chapter XV PIPE SIZES FOR WATER SUPPLY SERVICE THE lack of data upon which to base water pipe sizes for plumbing fixtures, branches and mains is probably due to the great number of variables which enter into their proper determination. Plumbing fixtures in common use, having what is known as good water flow, deliver the quantities of water per outlet as given in Table 92. TABLE 92. SUPPLY SIZES FOR FIXTURES AND MAXIMUM FLOW IN GALLONS PER MINUTE Number of Fixtures 1 2 4 8 12 16 24 32 40 Water Closets-- Tanks Pipe Size.............................................. K X lK m iK 2 2 2 Gal. per Min.,,..... ............................... 30 50 80 120 140 160 200 250 300 Flush Pipe Size........ 1 IX m 2 2 2 2K 2X 2K Valves ftUrinals-- Gal. per Min.......................................... 12 20 32 42 56 72 90 120 Pipe Size.._.............................. .............. K Gal. per Min..^............... ...................... 25 X 37 45 IK IK IK IK 2 2 75 85 100 125 150 175 Flush Pipe Size................................................. 1 IX IX IK IK 2 2 2 2 Valves Lavatories and Wash Sinks-- Based upon Each Faucet Gal. per Min.......................................... 4 8 12 24 30 40 48 64 75 Pipe Size............................................... . X X X 1 1 IK IK IX IK Bath Tubs-- Gal. per Min.....................................--. 15 30 40 80 96 112 144 192 240 Pipe Size......-............. ........................... X 1 IX IX 2 2 2 2X 2X Shower Baths-- Gal. per Min.......................................... 8 16 32- 64 96 128 192 256 320 8" rain Pipe Size ___ X X IX IX 2 2 2K 2X 3 Head Acid and Slop Sinks. Manufacturing, Kitchen and Laundry-- Gal. per Min... 15 25 40 64 84 96 120 150 200 per bibb Pipe Size..--............. _ ___ _ X IX IX IX 2 2 2 2 K per bibb NoU.--The above sizes are based upon a pressure drop of 30 lb. per 100 ft. In estimating risers and mains, the number of gallons for W. C. and urinals where flush valves are used are to be as given for tanks. The hot water faucets are to be disregarded when estimating risers and mains. Water flowing in pipes is retarded by friction, the extent of which depends upon the velocity, which is the cause of unsatisfactory service when pipes are too small. The amount of head necessary to overcome this friction is known as the friction head, which is usually expressed in feet. It is also known as pressure drop, usually expressed in lbs. per sq. in. per 100 ft. of pipe. The total pressure needed to discharge a given Material for this section furnished for The Guide by W. S. Timmis, New York. 161