Causes and solutions of insufficient liquid supply in Fire Fighting Pump

There will be various problems in the use of fire pump, but there is a very serious problem when there is no liquid supply, insufficient liquid supply or insufficient pressure, because the fire pump is mainly used for fire rescue, what is the cause of this problem? What are the solutions?

1. Impeller or pipeline is blocked. Solution: Check for obstacles.

2. The pump has no water injection or proper exhaust. Check that the shell and inlet line are filled with liquid.

3. The packing or seal in the packing box is worn, so that the air leaks into the pump shell. Check the packing or seal and replace it as needed. Check the lubrication.

4. Speed is too low. Solution: Check whether the wiring of the motor is correct, whether the voltage of the Fire Fighting Pump is normal or whether the steam pressure of the turbine is normal.

5. The impeller is damaged. Solution: Check the impeller and replace it as required.

6. The system head is too high. Solution: Check the head of the system.

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7. The position of the pressure gauge is incorrect. Solution: Check the position is correct, Fire Fighting Pump check the outlet nozzle or pipe.

8. The suction distance is too high. Solution: Check the existing net pressure head

9. The rotation direction is wrong. Solution: Check the rotation direction.

10. Insufficient suction head when pumping hot or volatile liquid. Solution: increase the suction head, consult the manufacturer.

11, the bottom valve is too small. Solution: Install the correct size of the foot valve.

12. Air production or inlet pipeline leakage. Solution: Check inlet lines for air pockets and/or air leaks.

13. The clearance of impeller is too large. Solution: Check whether the clearance is correct.

14. The diameter of impeller is too small. Solution: to the manufacturer to consult the correct impeller diameter.

From this point of view, the fire pump in daily life to carry out regular maintenance and repair, so as to avoid major problems, affect the normal use of equipment, serious wear and tear of equipment parts, damage to equipment, resulting in unnecessary losses.

From the operation of the fire pump, it is not difficult to see that its operation rate is fast, under the action of pressure, its operation process is very smooth, its main standby switching process is controlled by signal:

1, current signal control method: through the feedback of the motor current signal of the water pump, to judge whether the fire pump is working. When the motor short circuit (power failure), the current is too large, the power automatically switches to the motor of another pump set, stop the work of one pump, start the work of the other pump.

2. Pressure signal control method: the electric node pressure gauge is set on the outlet main pipe of the fire pump, and the switch between the main and standby pumps is judged by the signal of the pressure gauge. When the control box receives the action instruction, start either pump immediately. If the pressure indicated by the pressure gauge of the electric node after the pump works fails to reach the set pressure value, the control box will automatically switch to another pump to start the work.

Fire pump through the signal control method, to achieve its main standby switching process, improve the efficiency of the use of equipment, switching back and forth, usually in multiple pumps can achieve this function.


Post time: Aug-15-2022