Texaco Process High-Pressure Ash Water Pump.

The high-pressure ash water pump (multi-stage centrifugal pump) has experienced repeated damage to its shaft bearings and mechanical seals, as well as repeated wear and failure of the valve element in the minimum return pressure reducing valve. Cause analysis: Inadequate preparation before starting the pump each time, incorrect methods of rotating the pump and releasing air, neglecting to release air when switching filters, and operation of the minimum reflux pressure reducing valve under high pressure differences for extended periods. Solution: Run the auxiliary oil pump 2 hours in advance ； Rotate the pump after the auxiliary oil pump starts operating ； The exhaust is primarily discharged at the high point of the outlet when water is continuously injected into the pump body ； Before putting the filter into use, make sure to exhaust all the gas inside it. To do this, close the filter’s outlet valve first, and open it again after the gas has been completely exhausted ； Add a filter drain outlet ； Enhance monitoring of pump outlet pressure and flow to prevent prolonged operation beyond the rated capacity ； Add a flow-limiting orifice plate after the minimum reflux pressure relief valve ； A double-line system with a spring-loaded self-relief valve is added next to the minimum reflux pressure relief valve to prevent overpressure during startup ； Once the pump has started up and is operating properly, close all the minimum return pressure relief valves as much as possible to reduce wear. After the operational optimization, the pump was able to operate continuously for over 6 months without maintenance. Apart from several incidents of excessive wear of the balance drum and burnout of the thrust bearings in the deaeration water pumps, a design with symmetrically arranged impellers and self-balancing axial forces would likely be better.