Document r6DJXrbGgQnpwnY3Myezzvmbr

American Society of Heating and Ventilating Engineers Guide, 1929 above. This reduction in estimated amount is to take care of probable use. Thus, if 100 gal. are used on each floor of a 10-story building the size or pipe will be determined as in Table. 2: . The pressure drop of 30 lb. per 100 ft. of run will give satisfactory results for branches on the top floor but a higher pressure drop can be used on floors below corresponding with the pressures as given in Table 5 which show that for a building 100 ft. in height, a pressure drop of 100 lb. can be used on the fixture lowest branches and that for a building 50 ft. Table 1. Cold Water Branch Supply Sizes for Fixtures and Maximum Flow in Gallons per Minute Number of Fixtures 1 2 4 8 12 16 24 32 40 Water Closet9-- Gal. per Min.; . .... ................... 8 16 24 48 60 80 96 128 150 Tanks Pipe Size .. .. ........ .......... K K Gal. per Min........ _ ............................. 30 50 1 IK IK IK 2 2 2 80 120 140 160 200 250 300 Flush Pipe Size...... ..................................... ....... 1 IK IX 2 2 2 ZK ZK ZK Valves Urinals-- Gal. per Min... _ ____ ______ 6 12 20 32 42 56 72 90 120 Tanks Pipe Size............. ............ KH 1 IK IK IK IK 2 2 Gal. per Min.......................... . 25 37 45 75 85 100 125 150 175 Flush Pipe Size ______ 1 IK IK 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 _ .......................... ....... K X K 1 1 IK IK IK IK Bath Tubs-- Gal. per Min............ ...................... 15 30 40 80 96 112 144 192 240 mPipe Size................................................... k 1 IK IK 2 2 2 ZK Shower Bath9-- Gal. per Min............... Pipe Size____ ____ .. . m8 16 32 64 96 128 192 256 320 8" rain K K IK IK. 2 2 ZK 3 Head Acid and Slop Sinks, Manufacturing, Kitchen and Laundry-- Gal. per Min______ _____ ____ 15 Pipe Size.... ....... ......................... H 25 1 40 IK 64 IK 84 IK 96 2 1220 1250. 200 ZK per bibb per bibb Note.--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 cold-water risers and mains. in height, a pressure drop of 52 lb. can be used on the lowest fixture branches; Table 1, however, can be used with safety on any of the floors but will give pipe sizes larger than necessary for the lower floors in a very tall building. Table 5 gives the amount of water in gallons which may be passed through pipes of % in. to 4 in. diameter with pressure drop from 5 lb. to 150 lb. per 100 ft. of run. This table may be used in sizing horizontal and vertical mains. For example, if the water main pressure available is known, say 90 lb., and the horizontal run from water main to vertical riser is 100 ft., and the vertical riser is 100 ft. to'top branch; it will require 43.31 lb. for static head (see Table 6), and 15 lb. pressure at a minimum should be allowed for the uppermost fixture or a total of 58.31 lb. which would leave available for friction 90 -- 53.31 = 16.69 for friction in 200 ft. run, or 336 Chapter XX--Water Supply Systems and Piping for Buildings 8.34 lb. pier 100 ft. The main can thus be sized from the 7 lb. pressure drop of Table 5. Table 2. Water Risers for Manufacturing Buildings, Loft Buildings, Apartment Houses, Hotels G. P. M. G. P. M. Pipe Size with Drop per 100 Ft. Run 51b. 10 lb. 20 lb. 10 " 6 * 10 * 5 " 10 " 4 " 10 " 3 " 10 * 2 * 10 1 * 100x0.60 200 x 0.60 300 x 0.60 400 x 0.60 500 x 0.60 600 x 0.60 700 x 0.60 800 x 0.60 900 x 0.60 1000 x 0.60 60% = 60 90% - 108 80% - 144 70% - 168 60% - 180 50% - 180 40% - 184 40% - 192 40% - 216 40% - 240 2' ZK' 3' 3K' 3K' 3K' 3M' 3)4* su* 3X* 2' 2K' 2K' 3' 3' 3' 3' 3# 3* 3' IK' IK' 2' 2K' ZK' ZK' 2M' 2*4' 2 H* 2K' Note.--For residences, use Table 1. and for the main supply use 25 per cent of total of gallons used by fixtures and then take pipe size from Table 5 on a basis of 10 lb. pressure drop per 100 ft. or less if water supply pressure is less than 50 lb. Table 3. Apartment House Supply Risers Based upon One, Two, and Three Baths pier Apartment One (1) Bath Apartment 1 bath 1 W. C. 1 sink 1 lav. 15 gal. 8 gal. 4 gal. 4 gal. 31 gals. 50% demand--15 gals, per min. Top Floor Next " 15 28 38 gaUal " " " " " " " 51 60 67 71 78 81 83 84 85 a a u u a " a Riser IK" iK" l K" 2' 2' 2" 2' 2" 2' 2" 2' 2' Two (2) Bath Apartment 2 baths 2 W. C. 1 sink 2 lavs. 24 gal. 14 gal. 4 gal. 6 gal. 48 gals. 40%--20 gals. per min. 20 gal. 38 " 54 " 68 " 80 " 90 " 98 " 104 " 108 " 110 " 110 " 110 " Riser IK' 2IK" " 2" 2" 2" 2 K" 2 K' 2K" 2 K' 2 K' 2 K" Threb (3) Bath Apartment 3 baths 3 W. C. 1 sink 3 lavs. 30 gal. 18 gal. 4 gal. 9 gal. 61 gals. 40%--24 gals, per min. 24 gal. 43 " 64 " 82 " 96 " 108 " 117 " 124 " 134 " 143 " 143 " 143 " Riser 2IK" ' 2" 2" -2 2K' 2K" 2W 2 K" 2 K' 2 KT 2 K" Note.--'File pipe sizes are based upon a drop of 10 lb. water pressure for each 100 ft. run. The size of branch for each Apartment should be not less than 1FF in. Example--What is the riser size needed for a six-story apartment house having one bath for each apartment? Table 3 gives 2 in. diameter for all from four to twelve stories with IK in. to supply the top floor and next to top and IK in. for floor below. What is the size of riser needed for a twelve-story apartment house with three baths to each apartment? Table 3 gives 2K in. for all floors up to eighth floor, 2 in. for ninth, tenth and eleventh, and IK in. for top floor. What is the riser size for a two bath apartment six stories high? Table 3 gives 2 in. for the first four floors with IK in; at fifth floor and IK in. on the top floor. 337