Generally, the diagnosis of fire pump faults is a key link in the process of fire pump maintenance. The following are several common faults and elimination measures for you to diagnose fire pump faults in a targeted manner.
1. No liquid supply, insufficient liquid supply or insufficient pressure
1) The pump is not filled with water or is not properly vented
Elimination measures: Check whether the pump casing and inlet pipeline are all filled with liquid.
2) Speed is too low
Elimination measures: Check whether the wiring of the motor is correct, whether the voltage is normal or whether the steam pressure of the turbine is normal.
3) The system head is too high
Elimination measures: check the head of the system (especially friction loss).
4) Suction range is too high
Elimination measures: check the existing net pressure head
5) The impeller or pipeline is blocked
Elimination measures: check for obstacles.
6) Wrong direction of rotation
Elimination measures: Check the direction of rotation.
7) Air is generated or the inlet pipeline is leaking
Elimination measures: Check the inlet pipeline for air pockets and/or air leakage.
8) 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 as needed, and check whether the lubrication is normal.
9) Insufficient suction head when pumping hot or volatile liquids
Elimination measures: increase the suction head and consult the manufacturer.
10) The bottom valve is too small
Elimination measures: Install the correct size foot valve.
11) The immersion depth of the bottom valve or inlet pipe is not enough
Elimination measures: Consult the manufacturer for the correct immersion depth. Use baffles to eliminate turbulence.
12) Impeller clearance is too large
Elimination measures: Check whether the gap is correct.
13) Impeller damage
Elimination measures: check the impeller and replace it as required.
14) The impeller diameter is too small
Elimination measures: Consult the manufacturer for the correct impeller diameter.
15) Incorrect position of pressure gauge