Two types of fire pumps self-checking methods, the self-checking effect on the fire pump can be reflected. However, the low-speed self-test mode only runs a preliminary stage in the start of the fire pump, which cannot fully reflect the actual operation of the fire pump 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 judgments need to be made manually. Therefore, the fire pump self-test method can not completely replace the manual maintenance and management of the fire pump.
1. Analysis of self-test methods
The constant speed self-test mode simulates the actual working conditions of the fire fighting water supply in a certain period of time. It detects the whole process of starting and normal operation of the fire pump. And the pipeline design needs to be improved. The most important thing is to prevent the solenoid valve on the bypass line from malfunctioning. It must be opened during the self-test and closed in time after the self-test is completed.
The low-speed self-test method does not need to modify the pipeline of the fire pump, but it only detects one stage in the normal working condition of the fire pump. Fire pumps can be divided into direct start and indirect start. The indirect start has a Y/△ step-down start, an auto-coupled buck start, and a soft starter start. 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 the normal operation. The frequency conversion method also failed to run to the power frequency stage. However, in order to prevent the corrosion of the fire pump, the low-speed self-test method still has a certain effect. Relatively speaking, it features low-frequency drive, low-speed rotation, and low-power operation of the device.
2. Comparison of self-test methods
In the fire pump self-test mode, the constant speed self-test mode and the low-speed self-test mode play a certain role in the fire pump maintenance. From the perspective of maintenance management, they can all be used in fire water supply systems. Relatively speaking, the normal speed self-test method can reflect the actual operating conditions of the fire pump. From the point of view of the fire pump failure causes, the failure of the fire pump for a long time is mainly caused by the bite of the pump unit shaft. There are fewer problems with the incomplete starting of the motor, so the over-emphasis on the operation of the complete working condition of the fire pump is not very significant. The normal speed self-test method is applicable to the case where the fire pump absorbs water from the fire pool, and the layout of the pipeline should be reasonably considered in the design. There are certain problems in the operation, which can cause overpressure soon, and it is not very suitable for application in engineering. The constant speed self-test mode and the low-speed self-test mode have their own characteristics. Although the low-speed self-test mode is not comprehensive for the operation test of the fire pump, there is no special requirement for the design of the fire pump pipeline, which can basically be applied to the technical requirements of the fire pump self-test. It is more suitable for the case where the fire pump directly absorbs water from the municipal pipe network.