Document J37BKM9jp7qo1JxQKKm2aadq2
of andAmerican Society
Heating
Ventilating Engineers Guide, 1930
The quantities of condensate to be handled from direct radiation, directindirect radiation and indirect or fan blast radiation may be estimated
as fnllcurc
For direct radiation
W = 0.3 Rl
For direct-indirect radiation W = 0.6 R1
where
For indirect radiation
W= -- 55.6 X r
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.
r = the latent heat of steam in the system in B.t.u. per pound.
CONDENSATION PUMPS
s
Condensation return pumps are generally of two types: (1) automatic pumps and receivers, and (2) continuously operating non-automatic return pumps. These may be of the steam or power driven reciprocating type or motor-driven centrifugal type. Steam and power-driven recip rocating condensation pumps should always be of the automatic type.
Table 1. Horizontal Steam Driven Simplex Reciprocating Boiler peed Pumps--150 Lb. Working Pressure
Ctunder Sizes Inches
Steam Water Stroke
m
3, 4
4 5
SX 6
6 .7 8 7
m 8
8 10 12. 12
14
16
16
16
16
20
l Vs tX 1% 1)4
3
3)4
3% 4 4, 5 *X
*X
5 5 6
m
8
m
10 9M
10
12
2
1)4
3 6 6 6 8 8 8 8 10
10 10 12 12 12
12 12
16 16 20 20 20
X X X X X X X
1*
1 '1
1 1 1 tX IX tX
2 3 3 3 3
3'A
6bE8 'HES
Suction
Deliray
Capacjtt ih
Gallons per Stroke
Boiler
Horsepower Pomp will Feed
AT Moderate Speed
X X X 1X 1 1 IX
tx ix
iX
tx
ix m
2 2
ix
3X 3X 3X 3X
4
X
1
tx 2 2 2
IX ix IX 3
3X 3X 3X 4 4 5 5
6
8 8 8 8 8
X X X IX ix IX 2 2 2
ix 2X ix ix 3 3
4
4
5 7
'7 7
7
7
0.013 0.020 0.058 0.128 0.184 0.250 0.360 0.435 0.435 0.675 0.688 0.688 0.850 1.02 1.469 2.144 2.611 2.948 4.656 5.441 5.820 6.801 9.794
20 35 60 100 150 200 250 300 350 450 400 450 500 600 .1,000 1,500 1,650 2,000 2,200 2,500 2,400 2,700 .3,500
JThis is greater than the standard 0.25 lb. of condensate per souare foot, to take care of heating-up periods.
310
Chapter 19--Pumps and Traps
Automatic Pumps and Receivers
The volumetric capacity of receivers for electrically-driven pumps should be not less than twice the maximum minute volumetric flow of conden sation to be handled, measured between the high and low water lines in
Table 2. Horizontal Steam Driven Duplex Reciprocating Boiler Feed Pumps--150 Lb. Working Pressure
Steam
Inches
Water
Stroke
Steam
Pipe Sobs Inches
Exhaust Suction
'
Discharge
Gallons Piston
orBoiler
Horsepower
No.
Based on 34.5 Lb. Strokes
Evaporation-- per
No Factor or
Sapett
Dzs-
IN
32
3
4 ix 4
ix ix 4
SX 3X 5
64
6
7 4X 8
7X 4X 10
8 5 10
10 6
10
12 7 12
Vs X tx 1
X X
X x
2 2
tX tX
1 1
tx ix
I3X
tX 2
tx m 4
3
IX 2 4 3
ix 2 4 3
2 IX 5 4
IX 3 6 5
0.04 0.08 0.103 0.208 0.33 0.5S 0,69 0.85 1.22 1.99
83 150 180 330 470 760 840 1,100 1,600 2,300
70 5.6
60 9.6 60 12.0
50 20.0 50 33.0 50 55.0 40 55.2 40 68.0
40 97.6 35 139.3
Table 3 Horizontal Duplex Power Driven Boiler Feed Pumps 150 Lb. Working Pressure
Ctlendeb Maximum
Sizes, Inches R.P.M. Crank Shaft
Diam. Stroke
Dis
placement
Gallons
Brake*
Boiler
Gallons
PER
Horsepower Required
Horsepower Served
Without
Minute Revolution
150 LB. Pressure
Satett Factor
Pipe Sizes Inches
Pullet Sizes Inches and R. P. M.
Saction Disch. Diam. Face R.P. M.
IX 4 3- 4 3X 6 46
m8
5 10
sx 10
6 10
60 60 50 55 45 40 40 40
0.41 0.48 0.99 1.32 2.19 3.40 4.11 4.88
24 2.1
28 2.46
59 5.2
79 6.96 110 9.65
136 11.97 164 14.45 195 17.17
330 IX 2 tiX IX
390 IX 2 14X IX
820 3
2 25 5
1,010
4
3 25 5
1,520 4
3 30 5
1,890 4
3 37 8
2,280 5
4 37 8
2,700 5
4 37 8
.Figure pump efficiency at 50 per cent to arrive at motor horsepower to be used.
300 300 250 275 225
200
200
200
the receiver. For steam-driven pumps and receivers, the capacity may be less than for electrically-driven 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 volumetric displacement rate of water pistons should not beJess than three times the maximum volumetric rate of the flow of condensate
to be handled. The normal capacity of centrifugal pumps should not be less than twice
the maximum rate of flow of the condensate to be handled.
311