There is air in the multi-cylinder plunger metering pump
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It is a multi-cylinder metering piston pump, one of which uses lye as the fluid. Increasing the speed of the motor driving this piston pump has no effect on the other pumps; however, gas is generated within the piston pump that uses lye, which affects the flow rate (the flow rate appears high, but in reality the flow is insufficient due to the presence of gas). When the piston area is dried with steam, the flow rate can be controlled, while without steam application the flow rate fluctuates greatly. By opening the exhaust valve located below the buffer tank (dampener) at the pump’s outlet, gas is continuously discharged. I would be extremely grateful if experts from all walks of life could offer some guidance!
Thoroughly inspect the plunger and the check valve. Those that need grinding require replacement parts.
The inlet and outlet check valves have been inspected many times and there are no issues. I personally suspect there might be a problem with the packing at the piston, because as the number of reciprocations of the plunger increases, more gas is generated and cannot all be expelled. But the maintenance department believes it’s no problem.
It’s likely there’s a problem with the plunger’s packing, resulting in poor sealing and air leakage.
Can it be concluded that there is no leakage at the packing from the outside, if no liquid leakage is visible there?