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Industrial frequency inspection principle and technical requirements: The power frequency inspection can be the fire pump control cabinet installation time relay, adjust the fixed time to start the fire pump regularly, to achieve the regular start and operation of the fire pump. However, the normal idea is that although the periodic start and stop has reached the inspection function of the pump, how can the problem of pipelines and equipment be solved? Compared with the ordinary pump piping valve setting, the electromagnetic valve is installed between the pump outlet main pipe, the pump and the separate discharge pipe, and when the power frequency inspection starts, the electromagnetic valve at the main outlet pipe is first closed. The first pump is started according to the rated power. The water is normally activated in the pool and drained back to the pool via a separate discharge pipe, instead of being pumped into the main pipe. The second pump is inspected the same way. That is to say, the three electromagnetic valves control the pipelines between the pumps to form a closed loop, which can achieve both the start of the pump and the entire pipeline system.
Low-frequency inspection principle and technical requirements: low-frequency inspection is to use microcomputer controller to start the inspection subroutine, the use of variable frequency drive to drive the pump group, so that the equipment in the patrol actuator output a lower frequency to drive the fire pump one by one The fire-fighting pump is operated at a low speed for a period of low-speed operation, just like its own car. After the engine is ignited, it only shows that the engine can run normally but does not reach the number of revolutions the car is moving forward.
Features: The frequency conversion start increases the load current with the increase of starting power. This kind of soft start method will not have mechanical impact on the pump and increase the service life of the fire pump. When inspection, the pump speed is low, the pump will not produce water, nor will it Pressurization of the net will not cause the pipe network or sprinkler head to break; no pressure relief valve is added on the main pipe, and the design of the water supply and drainage engineer is not changed. This is especially convenient for the modification of old equipment. Low starting current, only the start-up phase, energy saving, no pressure on the pipe network, no impact on the power supply grid, unstable voltage, low power consumption, low pump speed during inspection, low starting current, fire protection The pump inspection output power is only a few percent of the rated output power. If two 55KW spray and fire hydrant pumps are used as an example, each pump will run for 10 minutes each week. For a long time, the energy saving is considerable.
Manual patrol features and technical requirements:
Features: It can carry out fire extinguishing test under all working conditions and can truly reflect the state of the fire pump. It can solve the problems found in routine maintenance in time. However, due to manual inspections, people must rely on human behavior and actions. For a long time, inspection personnel are prone to paralysis. Even if the management system has established a system for the management of fire-fighting equipment and daily inspections, it has no supervision. Manual inspections are also easy to form, so manual inspections have the disadvantages of poor management and unsupervised supervision.
Fire pump automatic inspection new technology came into being, but no matter what kind of inspection methods, there must be certain technical requirements for protection in order to make it perfect and reliable.
(1) The fire protection system should conduct a comprehensive test every year, and the fire pump should also be tested for water discharge. This is because the best conditions for the self-check of the fire pump are the conditions that can truly reflect the actual operation of the fire pump.
(2) The fire inspection method shall have the function of automatic switching during fire and ensure that the pump cannot be automatically stopped after the fire pump starts. When the fire pump is extinguished, it shall not respond to the inspection signal. During the self-check of the fire pump, if it encounters a command for fire-fighting operation, it shall be able to immediately interrupt the ongoing self-test action, promptly close the solenoid valve on the bypass pipe and confirm it, and forcibly stop the self-test. The system will automatically transfer the fire pump to the normal operating conditions so that the fire pump can reach the rated speed to ensure that the water from the fire pump can meet the flow and lift requirements of the system.
(3) In the fire-fighting water supply system provided with fire inspection, it is necessary to set a pressure relief valve from a reliable point of view. No matter whether it is the normal speed self-checking mode or the low-speed self-checking mode, the overpressure problem of the system may occur. If the solenoid valve is not open or the soft starter or inverter is not operating properly, it may be boring. Pressure relief valve can be set in the system to share. Atlantic Pumps (4) Because the fire pump strengthens the usual maintenance and management, the fire pump needs to run frequently, so the fire pump unit also needs to consider the vibration isolation measures of the pump and the pipeline. As a fire-fighting pump, it should also be prevented from being frozen to ensure the normality of the system, without causing equipment failure and damage. In addition to satisfying the above technical requirements, for the normal speed inspection method, it should also be possible to automatically open the solenoid valve before the fire pump inspection, and must automatically close the valve after the completion of the self-test. The solenoid valve can also be replaced with a pressure relief valve. The bypass pipe should be located in front of the check valve of the fire pump water outlet, so that each fire pump can be tested separately, and the system can prevent the system from escaping from the high fire water tank, failing to achieve the purpose of inspection of the fire pump, and the fire pump patrolling from the fire tank. The inspection method should use patrol drainage and return it to the fire pool. The diameter of the drain pipe should be the same as the pipe diameter of the fire pump.
Fire pump function and fire pump inspection
In the early stage of the fire, when the smoke reaches a certain concentration, the smoke senses the occurrence of a fire and transmits the fire signal to the fire control center. In the initial stage of the fire, the sprinkler sprays the water, and the main equipment for fire fighting is the fire hydrant. Manually combined with people to control the fire in the initial stage to prevent further expansion of the fire, but these operations are achieved by the fire water in the spray and fire hydrant pipelines. Is there any fire water that can not extinguish the fire? ? Rely on the start of the fire pump in the fire pump room, the water source in the fire pool is continuously sent to the various fire hydrants and sprinkler heads to achieve the purpose of extinguishing the fire. So the start of the fire pump at a critical time will be very much needed by us.