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Fire pump fault elimination measures and how to set fire pump control

Dec 27, 2022
Fire pump fault elimination measures and how to set fire pump control

Usually in the maintenance process, the diagnosis of fire pump faults is a key link. Here are several common faults and elimination measures for everyone 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 not vented properly Elimination measures: Check whether the pump casing and inlet line are completely filled with liquid.

2) The 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 water head of the system is too high Elimination measures: Check the water head of the system (especially the friction loss).

4) Suction lift is too high Elimination measures: Check the existing net pressure head (too small or too long inlet pipeline will cause great friction loss).

5) The impeller or pipeline is blocked Elimination measures: Check for obstacles.

6) The direction of rotation is incorrect Elimination measures: Check the direction of rotation.

7) Air is generated or there is leakage in the inlet pipeline Elimination measures: Check the inlet pipeline for air pockets and/or air leakage.

8) The stuffing or seal in the stuffing box is worn, causing air to leak into the pump casing Elimination measures: Check the stuffing or seal and replace it if necessary, check whether the lubrication is normal.

9) Insufficient suction head when pumping hot or volatile liquid Elimination measures: Increase the suction head and consult the manufacturer.

10) The bottom valve is too small Elimination measures: Install a bottom valve of the correct size.

11) The immersion depth of the bottom valve or the inlet pipe is not enough Elimination measures: consult the manufacturer for the correct immersion depth. Use baffles to eliminate eddy currents.

The first interface control method: the fire module outputs DC24V active signal control (that is, the fire module logic starts the pump, according to the principle drawing of the control cabinet provided by the manufacturer, this control method can realize the mutual switching function of the main and standby pumps, that is It is reasonable to use a module to control the automatic start-up pump. We believe that this control method can meet the relevant fire protection regulations).

The second interface control method: emergency control (from the fire control center to the pump control cabinet): is this emergency control method controlled by the water pump control cabinet (each pump control cabinet only uses a set of hard pull wires for control), or According to the water pump control (leave one interface for each pump and use three sets of hard pull lines to control the start and stop of the three pumps respectively)? To make this control method clearer, I would like to ask: Does the "fire emergency control (hard pull line control)" need to be controlled by the mutual switching circuit in the pump control cabinet or directly through the respective pump buttons of the fire control center to forcibly start the pump? If the fire control center button is used to forcibly start the pump, can it pass the fire department's acceptance? If it fails, where is the relevant specification to prove this problem?

The third interface control method: through the pressure switch on the alarm valve to start the pump, this control method is not considered for the time being, and it is just a control description here.

The fire pump starts usually in the following ways:

1. The fire pump control cabinet in the pump room starts the pump directly.

2. The multi-line module of the fire alarm host is activated. There is a multi-line control panel on the panel of the alarm host, and the corresponding start and stop buttons are on it, which is the first situation you mentioned.

3. Control the start and stop of the pump by relying on the change of the pipe network pressure, including: electric contact pressure gauge, pressure switch, etc. This is the case. This is the third case you mentioned.

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