Document bN3LdzmKOnn8gY0a6JkMVqak

American Society of Heating and Ventilating Engineers Guide, 1924-25 Piston speeds infeet per minute for reciprocating boiler feed pump ought not to exceed 10 times the square root of the number of inches in the length of stroke of the water pistons. Direct acting reciprocating steam driven or power driven boiler feed pumps are generally found to be more efficient for smaller installations TABLE S3. SIZES. REVOLUTIONS PER MINUTE.--HEADS PUMPED AGAINST. POWER REQUIRED AND BOILER HORSE-POWER FOR SEVERAL COMMERCIAL SIZES OF CENTRIFUGAL BOILER FEED PUMPS Sub op Pump Inches 2 2*4 3 4 5 6 8 2 2*4 3 4 5 6 8 2 2*4 3 4 5 6 8 H. P. Pipe Sizes Inches Suction J Discharge Capacity Gallons vest Min. Two Stage for 100 lb. Working Pressure 2*4 3 4 5 6 8 10 2 2*4 3 4 5 6 8 100 150 225 400 620 900 1600 Three Stage for 150 lb. Working Pressure 2*4 2 100 3 2*4 150 43 225 54 400 65 620 86 900 10 8 1600 Four Stage for 250 lb. Working Pressure 2*4 3 4 5 6 8 10 2 2*4 3 4 5 6 8 100 150 225 400 620 900 1600 Boiler H. P. Served Without Factor op Safety 1450 2175 3262 5800 8990 13,000 23,000 1450 2175 3262 5800 8990 13,000 23,000 1450 2175 3262 5800 8990 13,000 23,000 TABLE 54. DIRECT ACTING STEAM DRIVEN DUPLEX RECIPROCATING BOILER FEED PUMPS Dia. Dia. OP op Steam Water Cyl. Cyl. IN .in Length op Stroke in Inches No. op Strokes per Min. Inches Inches Discharge in Gallons Per Per Stroke Min. Equiva lent Dia. op Single Cyl. Pump Boiler H. P. Served Without Factor op Safety Pipe Steam Sub Ex haust INCHES Suc tion Dis charge 3 4*4 5*4 6 m m 10 12 2 254 3*4 4 4*4 5 6 7 3 70 0.04 5.6 2% 4 60 0.10 . 12.0 4 5 . 50 0.20 20.0 5 6 50 0.33 33.0 554 6 50 . 0.42 42.0 6*4 10 40 0.85 68.0 7 10 . 40 1.22 97.6 8*4 12 35 2.00 140.0 9*4 80 180 300 480 600 1000 1400 2000 *4 54 m i *4 u m m % m2 m i 1*4 2*4 2 m .2 3 2*4 1*4 2 3 2*4 2 254 4 3 2)4 3 5 4 76 American Society of Heating and Ventilating Engineers Guide, 1924-25 TABLE 55. HORIZONTAL DUPLEX PISTON PACKED POWER DRIVEN BOILER FEED PUMPS FOR 100 LB. WORKING PRESSURE Size of Pump Cylinders in Inches Dia. Stroke No. op Revolu tions per Min. Displacement Gallons Per Rev. Per Min. 2*4 4 34 3*4 5 46 8 10 30 0.34 10.2 30 0.49 14.7 30 0.83 24.9 25 1.30 32.5 20 8.69 173.8 Boiler H. P. Served Without Factor of Safety 148 213 361 471 2520 H. P. Required to Drive Pump 1.5 4.0 3.5 4.0 18.0 Pipe Subs Inches Suction Discharge 1*4 1*4 2 1*4 2*4 2 3 2*4 54 TABLE 58. RECIPROCATING SINGLE ACTING POWER DRIVEN TRIPLEX BOILER FEED PUMPS FOR 150 LB. WORKING PRESSURE Sub op Pump Cylinders in Inches Dia. Stroke No. op Revolu tions per Min. Displacement Gallons Per Rev. Per Min. 1*4 2 1*4 2*4 23 2*4 4 34 44 46 58 68 8 10 50 0.045 2.25 50 0.078 3.90 40 0.122 4.88 30 0.255 7.65 30 0.367 11.01 30 0.652 19.56 25 0.978 24.45 20 2.041 40.82 20 2.938 58.76 20 6.520 130.40 Boiler H. P.: Served Without Factor op Safety 33 57 70 110 160 280 355 592 852 1891 H. P. Required to Drive Pump 0.40 0.65 0.80 1.15 1.40 4.60 3.10 5.00 6.00 14.00 , Pipe Sizes Inches Suction 54 1 1*4 1*4 1*4 2 2*4 3 3*4 4 Discharge 54 1 1 1*4 1*4 1*4 2 2*4 3 3 TABLE 57. SCREW PUMPS Since the capacity and pressure at which Screw Pumps will operate is almost infinite, we can only give some idea of their capacity. Efficiencies range from 60% to 70%. Sub 2 2*4 3 3*4 3*4 4 5 5*4 6 7 8 9 10 12 16 G. P. M. 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 Max. Rev. 1600 1600 1600 1600 1500 1400 , 1200 1200 1200 1000 875 720 700 600 425 Suction Inches 2 2 2*4 3 4 4 5 5 6 8 8 10 12 14 16 Discharge Inches i*4 i*4 2*4 2*4 3 4 4 4 6 6 8 10 12 14 15 77