Edited and organized by Baili Bio:
1.The correct selection and careful installation of the centrifugal pump is an important prerequisite for the normal operation of the centrifugal pump. First, the correct selection of the centrifugal pump: first, before selecting the model, you must understand the physical and chemical properties of the material being transported, whether it is corrosive, No suspended solids, viscosity, freezing point and vaporization temperature saturated vapor pressure, etc .; must understand the working conditions of the conveyed materials in detail: conveying pressure, temperature, flow rate, conveying height, suction height, load variation range, etc. Based on the above two factors, refer to the characteristic curve of the centrifugal pump, so as to select the most suitable centrifugal pump for production. Secondly, there are many manufacturers of centrifugal pumps. Some of the centrifugal pumps have structural sizes that are not standardized, and the fit clearance is not the optimal value, which can cause damage to components due to assembly errors (including impellers, fasteners, bearings, and mechanical seals). In order to extend the life of bearings and seals, the improvement measures that can be taken are: strengthen the standardization and standardization of centrifugal pumps and parts; reduce assembly errors; improve design characteristics, such as reducing the shaft length and increasing the shaft diameter, and using a larger seal Cavity, the application of large-size bearings, and the enlargement of the bearing frame to improve the lubrication environment. Installation of centrifugal pumps: First of all, in construction, the construction and installation specifications of centrifugal pumps should be strictly followed, and there must be a complete quality supervision system and acceptance system. After the installation is complete, a trial operation must be carried out. Only after the trial operation cycle evaluates the pumps whose performance indicators meet the requirements can they be delivered to production. Secondly, the assembly accuracy of the internal components of the centrifugal pump must be carried out according to standards, including impellers, seals, bearings, etc .; during transportation, it is inevitable that the internal components of the centrifugal pump will be loose. Therefore, after the centrifugal pump is installed on the foundation, it is necessary to find the level. After connecting the pipeline to the inlet and outlet of the centrifugal pump, stress will be generated, which will cause deviations in the original alignment and should be re-aligned. Studies have shown that when the degree of shaft separation and the degree of coaxiality are less than 0.005mm per 25.5mm, the life of the rotating machine is about 100 months; when the straightness per 25.5mm is 0.0076mm, its life is shortened to 10 months; When the straightness of 25.5mm is 1.27mm, its life span is 2 months. Third, for some centrifugal pumps with higher requirements, it should be considered in the design to install a filter before the suction port and a check valve after the outlet valve.At the same time, two sets of monitoring devices should be installed in the operating room and on site to cope with sudden changes. The occurrence of accidents.
2. The correct use and periodic inspection are the fundamental way to extend the service life of the centrifugal pump: the correct start and stop procedures, start procedures: before starting the pump, the pump inlet valve and sealing liquid valve should be opened to check whether the pump body is full of liquid Start the centrifugal pump after confirming that the pump body is full of liquid and the sealing liquid has flowed normally; slowly open the outlet valve of the pump and adjust the outlet valve to the required opening through the flow and pressure indication. Shutdown procedure: slowly close the pump outlet valve; press the motor button to stop the motor; close the pump inlet valve and sealing fluid valve. Accurate selection of the flow rate and head of the centrifugal pump can accurately ensure that the centrifugal pump is in the best performance state during use. If the centrifugal pump is operated at a low flow rate, it will cause a circulating vortex in the centrifugal pump and generate radial forces, which will make the impeller in an unbalanced state, the bearing load will increase, and the seal and bearing will be damaged. The fluid temperature rises, the turbine and the pump casing are damaged, and the deflection of the pump shaft is increased, and even the pump shaft is fatigued and broken. If the flow cannot be increased in production, consider increasing the return flow from the process piping to achieve the purpose of adjusting the flow. Periodic inspection of centrifugal pumps. The periodic inspection of centrifugal pumps can generally be divided into the following three types: daily inspection. Even the inspection in use includes: checking whether various instruments work normally and stable, and the current should not exceed the rated value. The pointer of the pressure gauge should be within the design range; check whether the water output of the pump is normal, check whether the parts of the unit are leaking; check the degree of packing compaction, under normal circumstances, there should be a small amount of leakage at the packing (not more than 10 drops to 20 drops per minute), The leakage of the mechanical seal should not be greater than 10ml / h (about 3 drops per minute); the temperature of the rolling bearing should not be higher than 75 ° C; the temperature of the sliding bearing should not be higher than 70 ° C; there is no abnormal noise, abnormal vibration, and the amount of water output is reduced; Monthly inspection. Clean and minor repairs to the exterior of the equipment without disassembling parts, including inspections of bearing temperature, shaft seal leakage causes, and motor insulation; regular maintenance. Including changing the shaft seal lubricant, checking the pump and motor alignment, checking the sleeve wear, checking the coupling rubber ring damage, cleaning the mechanical seal, coolant filter and pump filter, checking the sliding parts for wear, checking Corrosion of components damaged by contact with liquid, etc.
3.Establish a sound maintenance system to ensure the long-term operation of the centrifugal pump: The centrifugal pump must be maintained after a period of operation. A sound maintenance system ensures the long-term smooth operation of the centrifugal pump and eliminates all problems. An accident that occurred. The main contents of the centrifugal pump maintenance in the workshop where the author is located are as follows: check the filter in front of the pump inlet valve, whether the filter screen is damaged, and replace it in time to avoid the particulate matter in the conveyed material from entering the pump body, and clean the filter screen regularly; Disassemble, clean, and reassemble the shell and impeller, adjust the gap between the impeller and the pump shell, and analyze the cause of damage and corrosion of the impeller and deal with it in time; clean the shaft seal and bushing system. Change the lubricating oil to maintain a good lubrication state; replace the packing of the packing seal, and adjust to the appropriate tightness, use the mechanical seal to replace the moving ring and sealing liquid; check the motor, and dry the motor before long-term shutdown ; Check the on-site instrument, whether its indication is correct, flexible and easy to use, replace the failed instrument; solid line) the valve on the pipeline controls the flow rate. 4.Conclusion: Compared with the construction of steam heating equipment or heating with electric equipment, this program has less investment and saves a lot of steam or electricity during operation, thereby saving energy such as gas or fuel coal, and reducing waste such as SO2. Emissions, reduce environmental pollution, and can eliminate the phenomenon of running, running, dripping, and leakage that occur with steam as the heating method. The maintenance and repair workload is reduced, and it can ensure the normal operation of production and meet the technical indicators. Possible deficiencies: Due to the large amount of impurities in the circulating ammonia, there may be blockages in individual dead ends or pipes with small diameters. (Pay attention to the clogging phenomenon in the heat exchanger and the phenomenon of mixing with clean water after completion.)
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