Causes of plunger pump failures
Thread Content
Our plant has a plunger pump that uses medium-pressure boiler water as the working fluid. During operation, the temperature reaches 105°C, and the pressure rises to around 4.5 Mpa at which point the pump shuts down. The reason for this is vaporization of the water and an increase in gas volume within the pipes, which leads to the pump stopping. The normal operating pressure for our pump is 6.5 MPa, the temperature is around 110°C, and the flow rate is approximately 11.5 m3/h. I would like to ask the experts here: what are the possible reasons for water vaporization in this type of equipment?
Waiting online, waiting online: call::call:
I didn’t quite understand what you mean? Does the plunger pump motor stop running? ? Is it the boiler feed pump? Generally, multi-stage centrifugal pumps are used for boiler feed water pumps~~ I’m a bit confused:(
The inlet of a plunger pump must have a certain static head; if this is not sufficient, the medium will vaporize, resulting in no flow. Personally, I wonder if there is gas in the pump inlet pipe while driving? Since the pump can operate normally at a water temperature of 110°C, there is no issue with insufficient static pressure at 105°C. What are the reasons for the vehicle shutting down? Generally, in imported models with air systems, the pump may not function properly, but the vehicle shouldn’t shut down just because of that, right?
Do the import and export units have energy storage tanks?
It seems that the reduced pressure at the inlet behind the air pump is causing the water in the high-temperature boiler to vaporize, which in turn affects the pumping capacity. Check whether the inlet pressure is below the saturated steam pressure of water at 105°C, and further investigate the reasons for the insufficient static pressure – is the liquid level low? Is the inlet filter clogged?