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American Society of Heating and Ventilating Engineers Guide, 1929
Size
2
214
3
314
4 5
3%
6 7 8 9 10 12 16
Table 4. Screw Pumps
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
214
3 4 4 5 5 6 8 8 10 12 14 16
Discharge Inches
m m 214 214
3 4 4 4 6 6 8 10 12 14 15
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.
Table 5. Sizes, Revolutions per Min. Heads Pumped Against, Power Required and Boiler Horse Power for Several Commercial Sizes of Centri-. fugal Boiler Feed Pumps
Size of Pump Inches
Brake
H. P.
Pipe Sizes Inches
Suction | Discharge
Capacity Gallons
Boiler H. P.
Served Without Factor
of Safety
2
214
3 4 5 6 8
2
214
3 4. 5. 6 8
13.3 16.9 23.6 37.2 57.0 76.5 125.0
Two Stage for 100 lb. Working Pressure
2H 2
100
3 214 150
43
225
54
400
65
620
86
900
10 8 1600
Three Stage for ISO lb. Working Pressure
.19.9 25.4 35.4 55.8 85.5 114.7 187.5
214
3 4
5 6 8 10
2
\ 214
3 4 5 6 8
100 150 225 400 620 900 1600
Four Stage for 260 lb. Working Pressure
33.2 42.3 59.0 93.0 143.0 192.0 312.5
214
3 4 5 6 8 10
2
2%
3 4 5 6
,8
100 150 225 400 620 900 1600
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
Chapter XVIII--Pumps and Traps for Heating and Ventilating Equipment
The volumetric displacement rate of water pistons should not be less than twice the maximum rate of flow of the condensate to be handled.
The quantities of condensate to be handled from direct radiation,
S'
Fig. 2. Typical Characteristics of Centrifugal Boiler Feed Pumps
direct-indirect radiation and indirect or fan blast radiation may be estimated as follows:
For direct radiation
W = 0.3 R*
For direct-indirect radiation W = 0.6 R*
where
For indirect radiation
W =' ^ ^ ^ ^ 55.6 X H
W = pounds of condensate per hour. R <= square feet of radiation. Q = cubic feet of air per minute. T = temperature rise of air in deg. fahr. H = the latent heat of steam in the system in B.t.u. per pound.
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.
heating*up periods*8 ** sreater than the standard 0.2S lb. of condensate per square: oot, to take care of 291