HMP-0567E Rev.7 (14/19)
a) If the tank head pressure is not being applied to the suction part of the pump.
- After removing the pipe flange, introduce hydraulic fluid into the pump whilst rotating
the pump shaft so that the pump fills with hydraulic fluid.
- Reconnect the pipe flange.
- Perform inching startup.
- Carry out unloaded operation at the maximum operating RPM for at least 5 minutes
and perform final confirmation that the pipe has been bled of air.
b) If the tank head pressure is being applied to the suction part of the pump.
- Partially open the pump delivery line, and then rotate the pump by hand to confirm that
hydraulic fluid emerges from the opened section.
- Close the opened section.
- Perform inching startup.
- Carry out unloaded operation at the maximum operating RPM for at least 5 minutes
and perform final confirmation that the pipe has been bled of air.
The following methods are recommended for inching startup.
- Perform intermittent operation of the pump 5 to 10 times with no load applied.
- When performing this intermittent operation, ensure that the duration of motor operation is 0.5
to 1 sec.
- If the pump is variable speed driven, adjust the RPM to 600 rpm or greater.
Repetition of this inching process will cause the gradual disappearance of the noise created by
entry of air. If this noise does not disappear, check for entry of air into the suction pipe etc.
5) Trial run
After completing pump startup, perform a trial run whilst paying attention to the following:
a) Increase the hydraulic circuit pressure gradually. The following pressurizing pattern is
recommended.
- Operate at the pressure for 50/ 70/ 90/ 100 % against the operating pressure: 100% for 5
minutes or more.
- Implement a short time on-load / unload operation after increasing the pressure. See to
Figure-4.5.1.
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