Product Manual

Owner’s Manual for Dry-Prime Diesel Trash Pumps 35

Operation

screen should be rigid enough to prevent collapse when

flow is reduced due to clogging.

9. Place the intake hose into the liquid to be pumped.

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.

NOTE: Recommended bell diameters and pipe

submergences for various flows are shown in Table 3.

The table data is referenced from ANSI/HI 9.8-1998.

Figure 3-49. Suction Specifications

CAUTION

(000268)

Equipment damage. Exceeding maximum suction lift

height of pump could result in cavitation/damage to

the pump.

002302

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.

Example

TDH (35 ft)

= 15.15 PSI

2.31

Table 3: Pipe Submergences

FLOW (GPM) 500 1000 1500 2000 2500 3000 3500 4000 4500

SUMMERGENCE WITH BELL (FT)

Bell Diameter (in) 6.1 8.6

10.6

12.2 13.6 14.9 16.1 17.2 18.3

Submergence (ft) 2.1

2.6 3.0

3.3 3.5 3.7 3.9 4.1 4.3

SUBMERGENCE WITHOUT BELL (FT)

PIPE ID (in) - No Bell SUBMERGENCE WITHOUT BELL (FT)

3 4.7

4 3.3 6.3