Document 3Jkj7yDw2de2dLbzz1wd9JzrE

American Society of Heating and Ventilating Engineers Guide, 1930 Table 4. Sizes, Revolutions per Minute, Heads, Power Required and Boiler Horsepower for Several Commercial Sizes of Centrifugal Type Boiler Feed Pumps . Size or Pump Inches Brake Horsepower Pipe Sizes, Inches. Suction | Discharge Capacity Gallons per Minute Boiler Horsepower Served Without Sapety Factor Tivo Stage for 100 lb. Working Pressure 2 13.3 2'A 16.9 3 23.6 4 37.2 5 57.0 6 76.5 2A 3 4 6 7 8 2, 2'A 3 4 5 6 100 ISO 225 400 620 900 1,450 2,175 .3,262 5,800 8,990 13,000 Three Stage for ISO lb. Working Pressure 19.9 2A 2 35.4 4 3 55.8 6 4 85.5 7 5 114.7 8 6 100 225 400 620 900 1,450 3,262 5,800 8,990 13,000 Four Stage for 800 lb. Working Pressure 33.2 2'A 2 59.0 4 3 93.0 6 4 143.0 7 5 192.0 8 6 100 225 400 620 900 1,450 3,262 5,800 8,990 13,000 Size or Pomp Inches 2 2A 3 m 3A 4 5 sh 6 7' 8 9 10 12 16 Table 5. Screw Pumps Gallons psa Minute Maximum Revolutions Suction Inches 2- 15 10- 20 20- 50 40- 60 55- 100 85- 200 175- 275 200- 325 275- 475 300- 600 450- 750 700-1000 800-1400 1200-2100 1750-4200 1,600 1,600 1,60^ 1,600 1,500 1,400 1,200 1,200 1,200 1,000 875 720 700 600 425 2 2 2A 3 4 `4 5 5 6 8 8 10 12 14 16 312 Discharge Inches 114 VA 2A 2X4 3 4 4 4 6 6 8 10 12 14 15 IBP vif Chapter 19--Pumps and Traps Continuously Operating Return Pumps The piston speed in feet per minute should not be more than 10 times the square root of the number of inches in the length of stroke. The normal capacity of standard centrifugal pumps should be based on condensate at a temperature of. not over 180 deg. fahr. For tempera tures of condensate above this the capacity should be increased as in Table 6. The increase in pump capacity may be reduced if a static head above Table 6. Correction Factors for Standard Centrifugal Pumps for Tempera tures of Condensate above 180 Deg. Fahr. at Pump Suction Deg. Fahr. 190 200 204 Factor 1.15 1.56 2.00 Note.--To use this Table, multiply the quantity of condensate to be handled by the factor corresponding to the temperature of the condensate at the pump suction and select a pump for the quantity thus found. Table 7. Simplex Piston Type Steam Driven Condensation Pump and Receivers Cylinder Sizes Inches Steam Water Stroke Steam Pipe Sizes Inches Exhaust Inlet Draining Capacity Delivery Square Feet 1 In. Pipe 2A 3 mm 2 2A 4 2Vs 3 5 3 3A 536 SA 3A 6 6 3A 8 648 7 48 8 5 10 10 6 12 12 7A 12 12 8 12 A Vs 2 A A A2 A Vs . A 2 A A A2 A2 l m A l 2 iA Al 2A 2 H- l l m 2A 2A 2 2 l 1A 3A 2A iK i h 4 3 iA 2 5 4 \A 2 5 4 1,000 2,000 3,000 4,500 7,500 9,000 13,000 15,000 15,000 27,000 40,000 65,000 70,000 3,000 6,000 9,000 13,500 22,500 27,000 39,000 45,000 45,000 81,000 120,000 195,000 210,000 the pump suction is provided. When this static head is made equivalent to the absolute boiling pressure of the condensate (measured in feet of water) minus 12 ft., no increase in pump capacity is required. This static suction head requirement may also be reduced about 50 per cent when special large suction inlets or special impellers are provided. Sufficient head in addition to the total head necessary to overcome static head, velocity head, pipe friction and boiler pressure should-be provided wherever condensate is to be returned directly to a boiler from the pump. VACUUM HEATING PUMPS Return-line vacuum heating pumps may be of the following types: 313