14
6. PUMP START UP AND SHUTDOWN
6-a. PRE-START CHECKLIST
Before initial start up and after inspections of the wet end of pump, perform the following inspections:
1. Manually turn the motor fan or flexible coupling to insure that it rotates freely. For a motor
mounted directly to the pump (close coupled), insert a screwdriver or other tool through the fan
cover and rotate the fan. It should rotate freely.
2. Make sure that the pump is full of liquid and the suction valve is open.
3. Fully open the discharge valve once and then close it, so that any air trapped in the pump and
suction line can be purged.
4. Check all electrical connections with a wiring diagram. Make sure that the voltage, frequency and
horsepower on the motor nameplate match the line circuit.
Caution!: K Series horizontal end suction models are not self-priming pumps! The pump must be
filled with liquid by gravity from a flooded suction tank or primed by other methods such as injecting
liquid from an outside source into the pump and suction line with an attached foot valve.
6-b. START UP AND OPERATION
1. With the pump full of liquid, check motor rotation by jogging pump and motor for about 1/2
second. The proper rotation is clockwise as viewed from the motor fan end. Once proper motor
rotation is confirmed jog 5 or 6 times more. This process is very important to fully wet sleeve
bushing and pump shaft, and to purge some of the air trapped in the pump and discharge line.
Open the discharge valve once and close it again so that more air can be released downstream.
2. Turn the pump on. Open the discharge valve slowly. It is important to open the valve very
slowly. Sudden opening of the valve while air is trapped between the pump and the valve may
cause water hammer.
3. Keep the suction valve fully opened. Do not use the suction valve to adjust flow rate. Adjust
the flow rate with the discharge valve only.
4. Subsequent pump starts do not require motor jogging or valve position changes provided that the
piping and pump has remained full of liquid.
To Next Page
Loading...