Operation measurement and analysis of variable speed pumps for variable water flow rate system

Variation of the pump efficiency mainly results from variation of pipe impedance. For the variable water flow rate system with distinct impedance variation, multiple pumps of the same type should be arranged in parallel to ensure pumps operating efficiently on different conditions and serving as backup alternatively for each other. The pumps should be operated by variable speed regulation combined with operating number regulation, and the pump speed should be the same.