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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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