Installation, Operation, and Maintenance Manual

Installation

1. Air pocket

Figure 19: Incorrect

1. No air pockets

2. Gradual rise

Figure 20: Correct

1. No air pockets

2. Eccentric reducer

3. Gradual rise

Figure 21: Gradual rise to the pump – correct

1. Distance plus eccentric reducer straightens the flow

Figure 22: Suction pipe above the pump – correct

1. Path of the water

Figure 23: Suction pipe above the pump – incorrect

Suction-piping valve considerations

Suction valves

CAUTION:

Never throttle the flow from the suction side. Only use suction valves to isolate the pump for maintenance, and install such valves in positions to avoid air pockets.

Before you install suction valves in the suction piping, review these considerations:

Model 3408 Installation, Operation, and Maintenance Manual 27