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Technical Briefs

# The Relationship Between the Maximum Efficiency and the Flow of Centrifugal Pumps in Parallel Operation

[+] Author and Article Information
Yi Wen1

College of Environmental Science and Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Panyu District, Guangzhou, Guangdong 510006, P. R. Chinawenyiwenyi@126.com

Xiaochu Zhang

Guangdong Pearl River Commercial and Logistics Investment Co., Ltd., Pearl River Investment Building 421, East Zhujiang Road, Zhujiang New Town, Guangzhou, Guangdong 510623, P. R. Chinazhangxiaochu@126.com

Pu Wang

Faculty of Urban Construction and Environment Engineering, Chongqing University, Chongqing 400045, P. R. Chinawpu2120@126.com

1

Corresponding author.

J. Pressure Vessel Technol 132(3), 034501 (Apr 21, 2010) (2 pages) doi:10.1115/1.4001141 History: Received December 24, 2007; Revised January 13, 2010; Published April 21, 2010; Online April 21, 2010

## Abstract

The maximum operating efficiency of a centrifugal pump is different when it is parallel operated with different pumps. To study the reduction in the maximum operating efficiency of pumps in parallel operation compared with their rated efficiency, 28 pairs of pumps with the same rated head and different rated flows were tested orthogonally in parallel operation. A determination of the pumps operating flow and head was done to calculate the maximum operating efficiency in different combinations. The results showed that the maximum operating efficiency of a pump in parallel operation was higher than 85% of rated efficiency when the flow ratio of two pumps was within 1.6. When the flow ratio was increased to 2.0, the maximum operating efficiency of the pump will sharply decline to 70% of rated efficiency or less. Therefore, the operating efficiency a pump can keep is 70% or more under the condition that the flow ratio between the pumps is less than 2.

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## Figures

Figure 1

Changes of flow ration and efficiency in operation

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