What is the method for evacuating the bottom of a negative pressure tower using a pump?
Thread Content
Most of the towers in the workshop are under-negative pressure towers, and it is very difficult to evacuate the bottom of one of the columnar towers using a pump. At first, I thought the inlet filter was clogged, but even after cleaning it, the flow rate remained low and there was still air suction. What should I do in such a situation? Thank you to all the seniors for their advice. Learning Chinese. :)
Is it because the oil is too light and thus tends to get emptied quickly? You could try setting a limit on the outlet valve, as well as opening a little of the pump return line to see if that helps
Check if the inlet filter has a filter element; if so, remove it. After maintenance, pay attention to venting the pump. There is usually a dead zone behind the pump inlet valve that makes venting difficult. If the oil density is not high, it is recommended to open the outlet vent valve and slightly open the inlet valve to vent air from the pump; close them once oil appears.
The main reason for the evacuation at the bottom of the negative pressure tower pump is that the pump was not filled properly. With its backup filling pump, the gas cannot be released into the atmosphere, resulting in negative pressure at the inlet. A line should be installed at the pump outlet leading to the middle of the tower or the reflux tank in order to remove non-condensable gases and prevent gas entrapment.
Balance lines are installed at the pump inlet and the tower