Fire pump fault diagnosis is usually a key step in the process of firefighting pump repair. Several common faults and elimination measures are given below to provide a targeted diagnosis of fire pump faults.
1. No liquid is available, the supply liquid is insufficient or the pressure is insufficient. 1) The pump is not filled with water or is not properly vented. Remedy: Check that the pump housing and inlet line are completely 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 head of the system is too high. Elimination measures: Check the head of the system (especially the friction loss).
4) Suction lift too high Eliminate measures: Check the existing net head (too small or too long inlet line will cause great friction loss).
5) Impeller or pipeline blockage elimination measures: check for obstacles.
6) The direction of rotation is not corrective: Check the direction of rotation.
7) Generate air or leak in the inlet line. Elimination: Check the inlet line for cavitation and/or air leakage.
8) The packing or seal in the stuffing box is worn so that the air leaks into the pump casing. Elimination measures: Check the packing or seal and replace it as needed to check if the lubrication is normal.
9) Inspiratory 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: Install the correct size bottom valve.
11) Bottom valve or inlet tube immersion depth is not enough Eliminate measures: Consult the manufacturer for the correct immersion depth. Use baffles to eliminate eddy currents.
12) Too much impeller clearance Elimination: Check that the clearance is correct.
13) Impeller damage elimination measures: Check the impeller and replace it as required.
14) Impeller diameter too small Eliminate measures: Consult the manufacturer for the correct impeller diameter.
15) Incorrect position of pressure gauge Eliminate measures: Check the position is correct and check the outlet nozzle or pipe.
2. When the fire pump runs for a while, it will stop. 1) The suction stroke is too high. Elimination measures: Check the existing net head (the inlet line is too small or too long will cause great friction loss).
2) Impeller or pipeline blockage elimination measures: Check for obstructions.
3) Air leakage or inlet line leakage elimination measures: Check the inlet line for cavitation and/or air leakage.
4) The packing or seal in the stuffing box is worn, causing air to leak into the pump casing. Elimination: Check the packing or seal and replace as needed. Check if lubrication is normal.
5) Inspiratory suction head when pumping hot or volatile liquids Elimination measures: Increase the suction head and consult the manufacturer.
6) Bottom valve or inlet tube immersion depth is not enough Eliminate measures: Consult the manufacturer for the correct immersion depth and use a baffle to eliminate eddy currents.
7) Damage to the water pump housing gasket. Elimination measures: Check the condition of the gasket and replace it as required.
3, the fire pump power consumption is too large 1) the direction of rotation is not correct measures: check the direction of rotation.
2) Impeller damage elimination measures: Check the impeller and replace it as required.
3) Remove the dead parts of the rotating parts: Check whether the clearance of the inner wear parts is normal.
4) Shaft bending elimination measures: Straighten the shaft or replace it as required.
5) Speed ​​too high Elimination measures: Check the winding voltage of the motor or the steam pressure delivered to the turbine.
6) The head is lower than the rated value. Pumping too much liquid Elimination measures: Consult factory. Install the throttle valve and cut the impeller.
7) The liquid is heavier than expected. Elimination Measures: Check the specific gravity and viscosity.
8) The packing box does not have the correct packing (insufficient packing, incorrect packing or run-in, packing too tight)
Elimination measures: check the filler and refill the stuffing box.
9) Incorrect bearing lubrication or bearing wear elimination measures: Check and replace as required.
10) Incorrect running clearance between wear rings Elimination measures: Check that the clearance is correct. Replace the wear ring of the pump housing and/or impeller as required.
11) The stress on the pump casing is too large. Elimination measures: Eliminate the stress and consult with the manufacturer. After removing the stress, check the alignment.
Fire pump fault diagnosis is usually a key step in the process of firefighting pump repair. Several common faults and elimination measures are given below to provide a targeted diagnosis of fire pump faults.
1. No liquid is available, the supply liquid is insufficient or the pressure is insufficient. 1) The pump is not filled with water or is not properly vented. Remedy: Check that the pump housing and inlet line are completely 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 head of the system is too high. Elimination measures: Check the head of the system (especially the friction loss).
4) Suction lift too high Eliminate measures: Check the existing net head (too small or too long inlet line will cause great friction loss).
5) Impeller or pipeline blockage elimination measures: check for obstacles.
6) The direction of rotation is not corrective: Check the direction of rotation.
7) Generate air or leak in the inlet line. Elimination: Check the inlet line for cavitation and/or air leakage.
8) The packing or seal in the stuffing box is worn so that the air leaks into the pump casing. Elimination measures: Check the packing or seal and replace it as needed to check if the lubrication is normal.
9) Inspiratory 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: Install the correct size bottom valve.
11) Bottom valve or inlet tube immersion depth is not enough Eliminate measures: Consult the manufacturer for the correct immersion depth. Use baffles to eliminate eddy currents.
12) Too much impeller clearance Elimination: Check that the clearance is correct.
13) Impeller damage elimination measures: Check the impeller and replace it as required.
14) Impeller diameter too small Eliminate measures: Consult the manufacturer for the correct impeller diameter.
15) Incorrect position of pressure gauge Eliminate measures: Check the position is correct and check the outlet nozzle or pipe.
2. When the fire pump runs for a while, it will stop. 1) The suction stroke is too high. Elimination measures: Check the existing net head (the inlet line is too small or too long will cause great friction loss).
2) Impeller or pipeline blockage elimination measures: Check for obstructions.
3) Air leakage or inlet line leakage elimination measures: Check the inlet line for cavitation and/or air leakage.
4) The packing or seal in the stuffing box is worn, causing air to leak into the pump casing. Elimination: Check the packing or seal and replace as needed. Check if lubrication is normal.
5) Inspiratory suction head when pumping hot or volatile liquids Elimination measures: Increase the suction head and consult the manufacturer.
6) Bottom valve or inlet tube immersion depth is not enough Eliminate measures: Consult the manufacturer for the correct immersion depth and use a baffle to eliminate eddy currents.
7) Damage to the water pump housing gasket. Elimination measures: Check the condition of the gasket and replace it as required.
3, the fire pump power consumption is too large 1) the direction of rotation is not correct measures: check the direction of rotation.
2) Impeller damage elimination measures: Check the impeller and replace it as required.
3) Remove the dead parts of the rotating parts: Check whether the clearance of the inner wear parts is normal.
4) Shaft bending elimination measures: Straighten the shaft or replace it as required.
5) Speed ​​too high Elimination measures: Check the winding voltage of the motor or the steam pressure delivered to the turbine.
6) The head is lower than the rated value. Pumping too much liquid Elimination measures: Consult factory. Install the throttle valve and cut the impeller.
7) The liquid is heavier than expected. Elimination Measures: Check the specific gravity and viscosity.
8) The packing box does not have the correct packing (insufficient packing, incorrect packing or run-in, packing too tight)
Elimination measures: check the filler and refill the stuffing box.
9) Incorrect bearing lubrication or bearing wear elimination measures: Check and replace as required.
10) Incorrect running clearance between wear rings Elimination measures: Check that the clearance is correct. Replace the wear ring of the pump housing and/or impeller as required.
11) The stress on the pump casing is too large. Elimination measures: Eliminate the stress and consult with the manufacturer. After removing the stress, check the alignment.
Fire pump fault diagnosis is usually a key step in the process of firefighting pump repair. Several common faults and elimination measures are given below to provide a targeted diagnosis of fire pump faults.
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