Civil Engineering Reference
In-Depth Information
Suction
Reservoir
Isolation Valve
(Typical)
Booster Pump 2
Discharge
Reservoir
Pump 1
Check Valve
(Typical)
Fig. 29-14.
Pumps in series
The electrical use on the electrical power supply to the water is (in U.S. customary
units only):
BHP
0.746
electrical use
(29-6)
E
m
where:
E
motor efficiency expressed as a decimal fraction.
m
In the SI system, the unit of power is the watt (kg
m
2
/s
3
), so Equations 29-4,
29-5 and 29-6 would not apply.
180
C
= 100
C
= 140
160
140
Two Pumps
120
100
80
One Pump
60
40
20
0
800
900
1,000
1,100
1,200
0
100
200
300
400
500
600
700
Pumping Rate, gpm
Fig. 29-15.
System curve for pumps in series
