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[Asia Pump Network News] Explosion-proof centrifugal pumps are widely used in chemical industrial systems, a universal fluid machinery. In general, the selected explosion-proof centrifugal pump flow, head pressure may be inconsistent with the requirements of the pipeline, or due to production tasks, process requirements change, this time require the pump flow control, in essence, to change the operating point of the centrifugal pump . Now talk about explosion-proof centrifugal pump flow control method. Explosion-proof centrifugal pump explosion-proof centrifugal pump operating point is determined by the pump characteristic curve and piping system characteristic curve, therefore, to change any one of the characteristic curve can achieve the purpose of flow adjustment. At present, the centrifugal pump flow control methods are the main control valve, variable speed control and the pump and the series adjustment. Due to the different principles of various adjustment methods, in addition to their own advantages and disadvantages, the resulting energy loss is not the same, in order to find the best, the least energy consumption, the most energy-efficient flow regulation, you must fully understand the explosion-proof centrifugal pump flow The relationship between regulation and energy consumption. Explosion-proof centrifugal pump in the course of the pump body vibration, causing the pump body and the outlet flange fracture, bearing wear and tear faster. Caused by: 1. Pump outlet pipe and pump flange installation serious dislocation, there is local stress. 2. Pump outlet tube care appear empty trust phenomenon, did not play a supporting role. 3. The pump outlet check valve is installed in the horizontal direction. During the operation of the pump, resistance is generated on the outlet pipe to generate vibration. Especially in the case of sudden water stoppage, the axial force caused by the hydraulic impact is greater. In view of these phenomena of the explosion-proof centrifugal pump, the concentricity of the flange and the outlet pipe of the pump port is re-calibrated to eliminate the pipe misalignment so that the coupling screw only has the axial compressive force to avoid the gravity of the bearing pipe or the pump body, Add screws to prevent the vibration washer, and increase the tube at the import and export of pipe care horn, reduce vibration and eliminate the phenomenon of false care; the check valve from the exit of the cross pipe to the first outlet after the pump outlet Of the vertical pipe installation, the sudden stop when the pump produces a vertical axial force along the pipe holder to the ground; stop pumping pump outlet valve is required to close and then stop to reduce the impact of water hammer on the pipe and check valve , Causing damage to the pump body. Through the characteristics of explosion-proof centrifugal pump and piping system diagram, the main methods of flow control of explosion-proof centrifugal pump are analyzed: exit valve regulation, pump variable speed regulation and pump serial and parallel regulation. The energy consumption loss of the outlet valve and the pump speed regulation are analyzed by the characteristic curve diagram. The comparison shows that the flow rate of the centrifugal pump is better than that of the outlet valve to regulate the flow rate, and the energy saving efficiency And the size of traffic changes. In the actual application should pay attention to the scope of variable speed regulation, in order to better application of explosion-proof centrifugal pump variable speed regulation. When a single explosion-proof centrifugal pump can not meet the delivery mission, you can use explosion-proof centrifugal pump in parallel or series operation. With two sets of explosion-proof centrifugal pumps of the same type in parallel, although the pressure head changes little, but increases the total delivery flow, the total efficiency of parallel pumps and single pump the same efficiency; explosion-proof centrifugal pump in series when the total pressure head Large, little change in flow, the total efficiency of tandem pumps and single pump efficiency the same. In the different regulation mode of energy consumption analysis, the article only for the current widely used valve regulation and pump variable speed regulation of two adjustment methods to be analyzed. Due to explosion-proof centrifugal pumps and tandem operation is aimed at increasing the pressure head or flow, in the field of chemical use is not much, its energy consumption analysis, the method is basically the same. Further Reading: pump valve pipe fittings Exhibition 2016 Exhibition of Information Industry, Internet (Xiamen) Technology Co., Ltd. Author: Asian pumps Network Editor: Yao Xiaoxia (QQ / micro letter:) http://beng.liuti.cn/ (Hotline :)