Abstract: The self-priming centrifugal pumps in petrochemical plants often fail to achieve self-priming during the commissioning phase. This paper analyses the causes of the above-mentioned fault based on the working principle of self-priming centrifugal pumps and actual cases. It identifies various factors that cause self-pri-ming faults and confirms that air leakage from the pump body and excessive pressure drop in the pipeline are the main factors leading to self-priming faults. Aiming at these causes, the paper puts forward suggestions for the equipment layout and pipeline design requirements of self-priming centrifugal pumps. These suggestions and requirements can improve the success rate of commissioning effectively and provide reference for future design work.

Key words: self-priming pumplself-priming centrifugal pumplfault analysislequipment layoutlpipeline design