- Discharge commences, pump and separator fill with oil.
- Vacuum pump and valve in gas extraction line are shut-off by float switch in pump separator.
- Discharge valve is fully open, the control system reacting to separator level.
- Tank level falls to point where separator level begins to fall causing the vacuum pump to start to extract the gases filling the top of the separator preventing cavitation. The extracted gases are vented to a slop tank.
- As the separator level falls, the control system partly closes the discharge valve on the pump to reduce the output of the pump.
In this way the discharge and stripping operation can continue, the discharge valve being progressively closed, as the vacuum pumps have to work harder to keep the separator full.
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