The decrease in the outlet pressure of a high - temperature - resistant centrifugal pump can be attributed to multiple factors, including impeller wear, air or gas presence, seal degradation, and line blockages. By being aware of these potential causes and implementing proper maintenance and preventive measures, operators can ensure the reliable and efficient operation of these pumps in high - temperature industrial settings.

The conversion of the outlet pressure unit of the sewage pump involves multiple different pressure units, including MPa, kilopascals, kilograms, meter water column, etc. When converting, attention should be paid to the conversion relationship and accuracy requirements between units, and the appropriate conversion method and value should be selected based on the actual situation and needs.