Generac Power Systems MAGNUM Owner's Manual page 39

screen should be rigid enough to prevent collapse when
flow is reduced due to clogging.
Place the intake hose into the liquid to be pumped.
9.
NOTE: The submergence of the suction pipe into the
liquid should be at least four to five times the pipe
diameter. If this is not possible, provide a baffle or a
floating board. This is to prevent any vortex action from
allowing air into the pipe/hose.
NOTE: For best performance, a bell mouth fitting is
recommended.
A Suction Lift: The distance between the centerline of the pump impeller and
the surface of the liquid being pumped.
B Vertical Discharge Head: Vertical distance from the centerline of the pump
inlet to the centerline of the highest point of discharge.
C Total Dynamic Head (TDH): Suction lift plus vertical discharge plus friction
loss.
D Submergence Distance
Note: To calculate PSI, divide TDH in feet by 2.31.
TDH (35 ft)
Example
2.31
FLOW (GPM)
SUMMERGENCE WITH BELL (FT)
Bell Diameter (in) 6.1
Submergence (ft) 2.1
SUBMERGENCE WITHOUT BELL (FT)
PIPE ID (in) - No Bell SUBMERGENCE WITHOUT BELL (FT)
3 4.7
4 3.3
Owner's Manual for Dry-Prime Diesel Trash Pumps
= 15.15 PSI
Figure 3-49. Suction Specifications
Table 3: Pipe Submergences
500 1000 1500
8.6
10.6
2.6 3.0
6.3
NOTE: Recommended
submergences for various flows are shown in
The table data is referenced from ANSI/HI 9.8-1998.
Equipment damage. Exceeding maximum suction lift
height of pump could result in cavitation/damage to
the pump.
2000 2500 3000
12.2 13.6 14.9
3.3 3.5 3.7
Operation
bell diameters and
Table
CAUTION
(000268)
B
A
D
3500 4000 4500
16.1 17.2 18.3
3.9 4.1 4.3
pipe
3.
C
002302
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