Generac Power Systems MAGNUM MTP4SZ Owner's Manual page 36

NOTE: If a manual shutoff valve is installed in the
discharge line, it must be open during operation.
Attach a rigid intake screen or strainer to the end of
8.
the suction hose before placing it in the liquid. This
will prevent large items or excessive trash from
entering the pump housing.
NOTE: The intake screen must have enough openings
to equal 28 sq. in. (181 sq. cm) or more (6 in. pump). The
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
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.
Note: To calculate PSI, divide TDH in feet by 2.31.
Example:
FLOW (GPM)
SUMMERGENCE WITH BELL (FT)
Bell Diameter (in) 6.1
Submergence (ft) 2.1
Owner's Manual for Wet-Prime Trash Pumps
TDH (35 ft)
= 15.15 PSI
2.31
Figure 3-49. Suction Specifications
Table 3: Pipe Submergences
500 1000 1500
8.6
10.6
2.6 3.0
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.
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
Submergence
Distance
01640
3500 4000 4500
16.1 17.2 18.3
3.9 4.1 4.3
pipe
3.
C
33