The fire pump is installed on the fire truck and fixed fire extinguishing system, and is used as a pump to transport liquid extinguishing agent such as water or foam solution, which is widely used in environmental protection, water treatment, fire protection and other departments. The types of pumps are similar, only the head and flow rate are different. The selection criteria for fire pumps should be based on five aspects: process flow, water supply and drainage requirements, etc. The performance and technical conditions of the fire pump comply with the requirements of the "Fire Pump Performance and Test Methods" standard. So what should we do if the fire pump malfunctions during normal use?

　　Fault Analysis

1) The suction distance is too high

Elimination measures: Check the existing net pressure head (inlet pipelines that are too small or too long can cause significant friction losses).

2) Impeller or pipeline blockage

Elimination measures: Check for obstacles.

3) Air generation or leakage in the inlet pipeline

Elimination measures: Check for air pockets and/or air leaks in the inlet pipeline.

4) The packing or seal in the stuffing box is worn, causing air to leak into the pump casing

Elimination measures: Check the packing or seal and replace it as needed. Check if the lubrication is normal.

5) Insufficient suction head when pumping hot or volatile liquids

Elimination measures: Increase the suction head and consult with the manufacturer.

6) Insufficient immersion depth of bottom valve or inlet pipe

Elimination measures: Consult the manufacturer for the correct immersion depth and use a baffle to eliminate eddy currents.

7) The sealing gasket of the water pump casing is damaged

Elimination measures: Check the condition of the sealing gasket and replace it as required.