13
4. Suction strainers, when used, must have a net “free area” of at least three times the
suction pipe area.
5. Separate suction lines are recommended when more than one pump is operating
from the same source of supply.
Suction Lift Conditions
1. Suction pipe must be free from air pockets.
2. Suction piping must slope upwards to the pump.
3. All joints must be airtight.
4. A means of maintaining prime, such as a foot valve, must be provided.
5. The suction strainer or suction bell MUST be at least three times the diameter of the
suction
6. Ensure that the size and minimum submergence over the suction inlet is sufficient to
prevent air from entering the pump through a suction vortex.
H min.
D
D
H min.
D
D
1.5D
min.
3.0D
min.
H min.
D min.
2
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
H = Min. Submergence in feet
H
1 2 3 4 5 6 7 8 9 10111213141516
V
V = Velocity in feet per second
= GPM x 0.321
Area
GPM x 0.4085
D
2
Suction Head (Flooded Suction) Conditions
1. An isolation valve should be installed in the suction line at least two pipe diameters
from the suction to permit closing the line for pump maintenance.
Summary of Contents for GSP Series
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