2. Start-up and Shut-down
2. 1. Start-up
(1) Before starting the initial operation after installation, observe the following check items and, if anything
abnormal is found, take necessary corrective action in accordance with this Manual.
1)
Are the pump and the suction pipe filled up with pumping liquid ?
2)
Is the driver's rotating direction correct ? (Pump rotates clockwise viewing from the driver's side)
3)
No abnormal in the direct coupling ?
4)
No abnormal load to the pump by piping ?
5)
Is the flushing pipe connected properly and the water flow rate proper ?
6)
Are the suction valve fully opened and the discharge valve fully closed ?
7) Isn't the gland packing tightened irregularly or too excessively ? Also, isn't there any abnormal
leakage from the gland packing ?
8)
Can the pump be turned lightly by hand ? Isn't there any touch of contact in the pump ?
(2) If nothing abnormal is found upon checking the above items, turns on the driver's start switch and off it
immediately to check that the pump rotates smoothly and shuts down quietly.
(3) If normal rotation of the pump is confirmed, gradually open the discharge valve up to the specific duty point,
after the pump reached its specified running speed. When leakage from the gland is much, re-tighten the
gland packing with equal torque for adjustment.
(4) If the pump continues running with the discharge valve fully closed, the liquid temperature in the pump will
rise, causing trouble of the pump. In such case, shut down the pump immediately without fail.
(5) When starting the pump after long term shut-down, recheck the above check items (1), and (5) thru (8) to
verify that the pump is abnormal-free.
2. 2. Shut-down
Follow the procedure given below for shutting down the pump.
1) Gradually close the discharge sluice valve up to full close position. However, it may be left as opened
providing that a check valve is included in the discharge pipe and the back pressure is sufficient.
2) Turn off the driver's stop switch. At the same time, check that the pump rotational speed decelerates
smoothly and stops quietly.
3)
Stop external flushing, if any.
4)
Fully close the suction valve when the pump is kept as shutdown for long time.
5) When there is a possibility of freezing in the pump, completely drain out the pumping liquid inside pump.
(Complete drain of the liquid in the line is more safety) .
2. 3. Maintenance
2. 3. 1. General
The pump must run quietly and without abnormal vibration all the times. Therefore, carefully observe the follow-
ing check items while the pump is in running and, if anything abnormal is found, shut down the pump immediately and
search the cause.
1) Does the suction pressure fully satisfy the pump required NPSH (NPSH req.) ? .... Read the suction line
pressure gauge to check it.
2) Is the specified discharge pressure satisfied ?
3) Isn't the driver in overload running ?
