There is a set of self-inspection methods in the fire water supply system. The fire pump self-inspection can not only prevent the fire pump from being corroded and stuck, but also give an alarm to the motor overload, short circuit, overvoltage, phase loss, undervoltage, overheating, etc. The self-inspection of the fire pump is a kind of technological progress to improve the management level of the system.
In several fire pump self-inspection methods, all can reflect the maintenance effect of self-inspection on fire pumps, but the low-speed self-inspection mode only runs a primary stage of fire pump startup, and cannot fully reflect the actual operation of fire pumps in the future. working conditions. In addition, after the results of the self-inspection of the fire pump are fed back to the fire control center, further judgment is required by human work. Therefore, the fire pump self-inspection method cannot completely replace the manual maintenance and management of the fire pump.
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Analysis of self-inspection methods
The normal-speed self-inspection mode simulates the actual working conditions of fire water supply within a certain period of time. It detects the whole process of fire pump starting and normal operation. The pipeline design needs to be improved. The most important thing is to prevent the electromagnetic valve on the bypass line from malfunctioning, it must be opened during the self-inspection and closed in time after the self-inspection is completed. The low-speed self-inspection method does not need to change the pipeline of the fire pump, but it only detects a stage in the normal working condition of the fire pump.
Fire pumps can be divided into direct start and indirect start, and those with higher power need indirect start. The indirect start includes Y/△ step-down start, auto-coupling step-down start, soft starter start, etc. In the operation of the fire pump, the start of the soft starter is only a preliminary stage of the operation of the fire pump, and then it is normal operation. The frequency conversion method also failed to run to the power frequency stage. But for preventing the corrosion of the fire pump, the low-speed self-inspection method still has a certain effect. Relatively speaking, it has the characteristics of low-frequency drive, low-speed rotation, and low-power operation of equipment.
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Comparison of self-inspection methods
In the fire pump self-inspection mode, the normal speed self-inspection mode and the low-speed self-inspection mode both play a certain role in the maintenance of the fire pump. From the perspective of maintenance and management, they can all be used in the fire water supply system. Relatively speaking, the normal speed self-inspection method can reflect the actual operating conditions of the fire pump. From the perspective of the cause of the fire pump failure, the failure caused by the long-term non-use of the fire pump is mainly the occlusal problem of the shaft of the pump unit. There are few problems in the working condition of incomplete starting of the motor, so it is not very meaningful to overemphasize the operation of the complete working condition of the fire pump.
The normal-speed self-inspection method is applicable to the situation that the fire pump absorbs water from the fire pool, and the layout of the pipeline should be considered reasonably in the design. There are certain problems in operation, which can quickly cause overpressure, so it is not very suitable for engineering application. The normal-speed self-test mode and the low-speed self-test mode have their own characteristics.
Although the low-speed self-inspection method is not comprehensive for the operation and inspection conditions of the fire pump, it has no special requirements for the design of the fire pump pipeline, and basically can be applied to the technical requirements for the self-inspection of the fire pump. It is more suitable for the situation where the fire pump absorbs water directly from the municipal pipe network.
The fire pump is suitable for fire pumps. The fire pump needs regular maintenance to ensure the normal use of the fire pump. So how to maintain the fire pump?
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1. Adjust the tightness of the packing gland at any time according to the operation of the fire pump. The packing seal drips 30 to 60 drops per minute.
2. Grasp the packing wear and replace the packing in time. When replacing the packing, the joints of each adjacent packing should be staggered by more than 90 degrees, the water seal tube should be aligned with the water seal ring, and the opening of the outermost packing should be downward.
3. The fire pump should replenish lubricating oil or grease in the bearing in time to ensure that the oil level is normal; the change of oil quality should be checked regularly, and new oil should be replaced if the oil quality is unqualified.
4. Regularly check the limit switch of the electric power valve and the manual and electric interlocking device.
5. The vibration of the pump should be monitored regularly. When the vibration is unreasonable, the cause should be found out in time and dealt with.
6. The valve packing should be checked, adjusted, and replaced irregularly, so that there is no water leakage, no oil stains, and no rust.
7. When using soft packing to seal, add packing at any time according to the actual situation to prevent leakage.
8. The components of the fire pump should be intact, and the equipment nameplate should be clear.
9. The external parts of the equipment should be perfect: no rust, no oil leakage, no electricity leakage, no water leakage, no air leakage.
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