Document YG5DqQJQgG2wj0rrbwr85y9QE

1924-25of andAmerican Society Heating Ventilating Engineers Guide, TABLE 38. CAPACITIES OF RETURN MAINS IN SQ. FT. 'Size of Pipe 1' ' IK' IK' 2' 2K' 3' 3K' 'Length 300' 600 1,200 3,000 8,200 15,000 28,500 40,000 " 800' 375 750 1,875 5,200 9,700 17,000 25,000 " 1,750' 600 1,300 3,750 - 6,700 12,000 18,000 " 2,500' 1,125 3,000 5,600 9,425 15,000 TABLE 39. CAPACITIES OF SUPPLY RISERS IN SQ. FT. Size of Pipe 1' IK' IK' 2* 2K' 3' "Length 200' " 400' " 600' " 1,000' " 2,000' 73 52 42 33 23 160 248 500 830 1,500 114 177 357 592 1,040 92 -145 290 480 845 72 112 225 374 657 51 80 160 264 463 Horizontal branches to risers to be one size larger than riser. 3K' 4,750 3,240 2,630 2,045 1,450 TABLE 40. CAPACITIES OF RETURN RISERS IN SQ. FT. Size of Pipe H" 1' IK' 'Length 200' 700 1,400 3,150 " 400' 560 1,120 2,480 " 600' 420 840 1,750 < 1,000' 350 - 700 1,470 " 2,000' 230 460 1,050 Length equals measured distance from vacuum pump to end of riser. Length equals measured distance from boiler or pressure reducing valve to end of riser. Capacities as given in Tables 38, 39, 40. include allowances for elbows, tees. etc. TABLE 41. RADIATOR CONNECTIONS Capacity in Sq. Ft. Radiation 1 to 100 101 to 200 201 to 300 Size of Inlet Valve K" V IK' Supply Vertical. Pipe to Inlet Valve Horizontal Runout to Vertical Inlet Pipe K' l* 1* IK" IK" IK" Return Size Trap Stub to Trap Horizontal Runout to Stub K" K' K" K' K' K' K" K" K" Radiators to be water pattern tapped or bushed top and bottom opposite ends. Steam pattern radiators can be used when tapped of bushed eccentric opposite ends with supply bushing turned up and return' bushing turned down. 50 Chapter IV PIPE SIZES FOR STEAM WITH COUNTER FLOW OF CONDENSATE THE Research Laboratory of the American Society of Heating and Ventilating Engineers is making an investigation of the Flow of Steam in Pipes with the Counter Flow of Condensate. The object Fig. 14. Capacities of Steam Pipes as Affected by Critical Velocity of Steam and Condensate Mixtures of'the investigation is, first, to determine the fundamental phenomena taking place in such a pipe, and, second,, to determine the capacity of various connections found in heating practice. In connection with this This section especially compiled by F. C. Houghten, New York. 51