How to choose the type of fire pump
Many industries in the face of the selection of fire pumps will feel that it is a thorny issue, in fact, should not be based on fire pump application engineering process, water supply and drainage requirements, from the liquid delivery volume, the device head, the nature of the liquid, the pipeline Layout and operation of the operating conditions of five aspects Yongjia joint labor valve factory will make a relatively comprehensive analysis. Fire pump is the fire pump system used, according to different classification Fire pump can be divided into different types: for the fire pump system is divided into the following categories: fire sprinkler pump, fire hydrant pump, fire pump, fire control by Pump, according to the actual situation to be used. With the type of fire pump system are similar, but the head and flow are different. Fire pump is divided into vertical fire pump and horizontal fire pump, the flow of liquid delivery is one of the important performance data of the fire pump selection, the flow of liquid delivery is directly related to the entire plant's production capacity. Fire pump self-test mode Self-test fire fire water supply system for the daily test provides a way. In the fire pump self-test, not only to prevent corrosion pump fire stuck, but also motor overload, short circuit, overvoltage, lack of phase, undervoltage, overheating alarm. Fire pump self-test to improve the management level of the system after all, is a technological progress. In the two kinds of fire pump self-test mode, can reflect the self-test on the fire pump maintenance, but low-speed self-test mode only run a start-up fire pump in the initial stage can not fully reflect the actual operation of the fire pump in the future Condition. In addition, the fire pump self-test results back to the fire control center, the need for artificial to make further judgments. Therefore, self-test fire pump can not completely replace the manual fire pump maintenance and management. 2 self-test mode of analysis Frequent self-test method in a certain period of time to simulate the actual conditions of fire water. The test is the start of the fire pump, the normal operation of the entire process. In the pipeline design needs to be improved. The most important thing is to prevent the solenoid valve on the bypass pipeline failure, must be done in the self-test open, self-test is completed in a timely manner after the closure. Low-speed self-test mode does not need to make changes to the fire pump piping, but the test is only a normal phase of the fire pump in a phase. Fire pumps can be divided into direct start and indirect start, large power need to start indirectly. Indirect start with Y / â–³ buck start, auto buck start, start the soft starter and so on. In the fire pump operation, the start of the soft starter is only a pre-fire pump operation, followed by normal operation. The frequency conversion method also failed to run to the power frequency stage. However, to prevent the fire pump corrosion, low-speed self-test method or have a certain role. Relatively speaking, it features low-frequency drive, low-speed rotation, low-power operation of the device. 3 Comparison of self-test mode In the fire pump self-test mode, the constant self-test mode and low-speed self-test mode are in the fire pump maintenance has played a certain role. From the point of view of maintenance and management, they can be used in fire water supply systems. Relatively speaking, the regular self-test mode can reflect the actual operating conditions of the fire pump. From the fire pump fault causes point of view, fire pump long-term failure caused by the pump shaft is not the main bite. Motor starting incomplete conditions less problems, so overemphasizing the operation of the fire pump complete condition, its significance is not great. Normal speed self-test mode applies to fire pump water from the fire water tank, the design should be reasonable to consider the layout of the pipeline. In operation there are some problems, can cause overpressure soon, the application is not very suitable in engineering. The self-test mode and low-speed self-test methods have their own characteristics. Although the low-speed self-test mode of operation of the fire pump is not comprehensive, but the fire pump piping design no special requirements, basically applicable to fire pump self-test technical requirements. It is more suitable for fire pump water directly from the municipal pipe network situation.
The elevator shaft is the space for elevator operation, which is composed of shaft wall, bottom plate and top plate. The size of the elevator shaft is determined according to the elevator model selection. The shaft wall is installed with elevator rails and counterweight rails, and the reserved door opening is installed with elevator doors. There is an elevator machine room at the top of the hoistway. China Elevator Shaft Components,Elevator System Components manufacturers, welcome Elevator Shaft,Lift Shaft Components purchasers from worldwide to visit our site.
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