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PRESSURE ENERGIZED PUMP EXAMPLE
a) Condensate load to be pumped …. 6,000 pph
b) Steam pressure available as pump motive force …. 100 psig
c) Vertical lift from pump to return piping …. 11.5 feet
d) Pressure in return piping …. 35 psig
Calculate the total back-pressure against which the condensate must be pumped (i.e., lift pressure = 11.5 x 0.433 = 5.0 psi, discharge piping pressure = 35 psig, total backpressure = 40 psig).
Refer to table to review sizing
requirements.
A 2" pump with a minimum filling head of 12", standard bronze check valves and piping will pump 6,600 pounds per hour providing an overall capacity of 110% of required flow.
| Pressure
(psig) |
Pump
Size |
| Inlet |
Total
Lift |
1" |
1
1/2" |
2" |
3"
x 2" |
4" |
| 150 |
15
40
60 |
2,550
2,400
2,250 |
4,650
4,450
3,850 |
7,300
6,800
6,500 |
12,300
11,200
11,000 |
43,120
38,090
34,050 |
| 125 |
15
40
60 |
2,500
2,350
2,250 |
4,650
4,450
3,850 |
7,300
6,800
6,500 |
12,300
11,500
11,000 |
43,000
38,000
34,000 |
| 100 |
15
40
60 |
2,550
2,350
2,150 |
4,550
4,150
3,550 |
7,200
6,600
6,300 |
12,100
11,300
10,700 |
41,500
36,600
32,000 |
| 75 |
15
40
60 |
2,450
2,350
1,950 |
4,150
3,750
3,350 |
7,290
6,300
5,400 |
12,100
10,600
9,200 |
41,200
33,500
26,000 |
| 50 |
10
25
40 |
2,450
2,350
1,950 |
3,900
3,600
3,150 |
6,900
6,300
5,200 |
11,700
10,600
8,900 |
41,200
33,500
26,000 |
| 25 |
5
10
15 |
2,250
2,050
1,950 |
4,100
3,800
3,200 |
6,600
6,100
5,500 |
11,300
10,400
9,400 |
* |
* Consult with your representative to achieve rated capacity; the pump must be installed with check valves supplied by Eastern Machine Inc. Use of any other check valves may alter pump performance.
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