There were problems with the high-pressure ash water pump.

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The high-pressure ash water pump in our plant has developed problems. I think our plant should summarize the precautions to be taken after such incidents; if anything is missing, I hope everyone can help fill in those gaps. Before the pump started having issues, the outlet flow rate decreased as operation time increased – the pump was unable to handle the load, and its temperature rose. The reason for this was that the packing from the deaerator’s trays ended up in the filter at the inlet of the high-pressure ash water pump, causing the filter to become clogged. The low inlet flow rate led to damage to the pump. Afterwards, the deaerator’s trays were welded shut, and the pipeline from the deaerator to the pump’s inlet was cleaned. The second issue was that the manual valve serving as a backup for the high-pressure graywater filter could not be closed properly, and this was not addressed in time; as a result, another filter became clogged. It was not possible to switch to another filter, so it was necessary to use the backup pump. However, that pump also developed problems after operating for a short while, forcing another switch to another pump. With only one functional filter available, operations could not continue for long, which ultimately led to a shutdown. Third, for the high-pressure ash water pump, the pump was not checked properly according to the startup procedure, which led to the pump burning out due to a lack of oil; subsequently, a startup procedure was required for the pump. The fourth pump was sent back to the manufacturer for repair. The manufacturer found severe cavitation inside the pump, attributing it to the high temperature of the deaerator; subsequently, the manufacturer specified a suitable temperature range for the deaerator. I hope everyone can list the problems that have occurred with the high-pressure ash water pumps in your plant, as well as the actions taken to address them and the precautions to be observed.