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12
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Start-Up Preparation
When operating the pump for the first time after installation, and when restarting operation after a long
interval, prepare for operation as described below.
1. Thoroughly clean the inside of the piping and pump.
2. Tighten the union fittings or flange connecting bolts and baseplate installation bolts. Check that bolts
which couple the front casing and the bracket together are securely fastened.
3. Close the cocks of any pressure or vacuum gauges to prevent damage from sudden pressure changes. Open
only when taking measurements.
4. Fully open the suction gate valve and partly open the discharge valve. Discharge valve may be adjusted
after completion of priming and start-up process.
5. Use a screwdriver to rotate the motor fan and check that the fan rotates smoothly. This also purges any
residual air from in and around the impeller.
6. If using flooded suction, measure the pressure in the suction pipe to check that the pump is filled with
liquid.
7. Run the motor momentarily to check the direction of motor rotation. The motor should run in the direc-
tion indicated by the arrow sealed on the pump. If the direction is reversed, exchange two wires of the
three-phase power wires.
Note: All Iwaki Walchem MDH-(F) series pumps spin counter-clockwise when looking at the suction
port of the pump. Naturally, from the motor fan side, this would be viewed as clockwise.
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Starting Operation
Pump operation is detailed below.
Check/Operation Step
Remarks
1.
Verify valve position.
Suction valve fully open.
Discharge valve fully closed.
2.
Check that the pump is filled with liquid.
If pump is not filled with liquid, fill it in accor-
dance with steps 5-6 of 'Start-up Preparation'.
3.
Turn ON motor switch momentarily and
See the arrow on the casing to confirm the
check for correct direction of pump
direction of rotation (clockwise when viewed
operation.
from the motor fan side).
