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During the operation of fire pumps, it sometimes happens that the suction lift of the fire pump suddenly increases. If the suction lift of the fire pump suddenly increases significantly, there’s no need to panic. By carefully analyzing the cause and taking effective corrective actions, the problem can be resolved. Next, Shanghai Liangong Pump Industry will explain to you the reasons behind a sudden increase in the suction lift of fire pumps, as well as the solutions to address this issue. 1. Check whether there is a fault with the impeller. During operation, if there are many large obstacles on the gears of the impeller in a fire pump, it will result in an increased suction head for the pump. To solve this problem, it is necessary to remove the obstacles from the impeller; after cleaning, it is advisable to apply a layer of rust-proof oil to prevent further blockages. II. Check whether the packing in the stuffing box is leaking or has suffered from wear out. Under normal circumstances, the packing in the stuffing box is not prone to wear, but if wear is detected, the stuffing box needs to be cleaned and new packing added. III. Check whether there is a leak in the air or the inlet pipeline. If the air leakage is not properly sealed during the operation of the fire pump, it will result in an excessively high suction lift. This situation is quite common; to resolve it, it is necessary to carefully inspect the inlet pipeline, locate the point of leakage, and address the pipeline leakage issue. Article source: www.liangongpv.com