Page 86 - Know and Understand Centrifugal Pumps
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Pump CI assi fica ti o n
HYDROCARBONS
MINIMUM CONTINUOUS FLOW AS % OF BEP FLOW
ON NON-TRIMMED IMPELLER.
USE 1/2 BEP FLOW FOR DOUBLE SUCTION IMPELLERS
100
200
300
400
500
600
700
800
900
1 .ooo
2.000
3.000
4.000
5.000
6.000
7.000
8.000
9.000
10.000
20.000
30.000
WATER BASED LIQUIDS
MINIMUM CONTINUOUS FLOWAS % OF BEP FLOW ON FULL SIZED IMPELLER.
FOR DOUBLE SUCTION IMPELLERS, USE 1/2 BEP FLOW
Figure 6-15
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operate this pump at less than 42% of the REP. 42% of 600 gpm is 252
gpm. The operator of this pump should not throttle a control valve and
restrict this pump at less than 252 gpm. If the operator throttles this
pump to 240 gpm, and goes to lunch, he’ll probably have an
emergency when he returns from his lunch break. Actually this failure
would be an operation-induced failure. If you’re mistreating your car,
you cannot blame the mechanic.
In the Second example, the line terminates at 29%. This means DO
NOT operate this pump at less than 29% of the BEP. 29% of 1200 gprn
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