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May 18, 2022 View:

High viscosity lobe pump use and installation skills

High viscosity lobe pump is a new type of volumetric pump developed according to the needs of petroleum, chemical, coating, oil and grease, pharmaceutical, dye, food and other industries. Because the product can be selected from different materials and its unique structure, it is widely used in different properties, different viscosity of the media transport.

1. In principle, the pump can only be operated under the conditions of pressure, flow rate, viscosity, temperature, PH value, solid content, etc. based on the selection and order, and avoid operating in conditions beyond the limits as much as possible.
2. The increase of material viscosity, flow rate and pressure during working may cause motor overload, so the pressure gauge, safety valve and over-current protection device should be checked frequently to see if they are normal.
3. The pump with insulation device should be preheated with hot water (steam) before starting, and then start after the pump temperature rises to the requirement of conveying process. Before shutting down, the pump should be stopped before shutting down the hot water (steam).
4. Before starting the mechanical seal device with cooling water, the cooling water should be turned on first, then the pump, and often observe whether the cooling water is normal, and it is strictly forbidden to run without cooling water operation.
5. The filter and strainer should be cleaned monthly within one year after installation to avoid blockage, which may cause the pump not to operate normally. Try to avoid the use of Y-type pipe filter (Y-type pipe filter effective area is too small, affecting the flow rate of the feed medium, resulting in pump vibration).
6. For the transportation of solidifying high viscosity medium, the medium in the pump should be diluted before stopping the pump to prevent the high viscosity medium remaining in the pump from solidifying, if necessary, please use the cleaning solution to clean through the pump cycle for 5-10 minutes.
7. When the media will be thickened and condensed after cooling, it should be run with cleaning liquid for 5-10 minutes to clean the inner cavity after the operation. If necessary, the cleaning fluid should be replaced several times and the cleaning time should be extended.
8. For newly installed pipeline, the welding slag and hard particle foreign matter must be removed from the pipeline to avoid the usage from entering the pump cavity and damaging the rotor, pump body, main and secondary shafts, mechanical seals, etc.
9. Regularly check whether the connection and fastening screws are loose, if so, please tighten them in time.
10、Check the oil surface mirror of gear box frequently, if there is no oil surface visible, it needs to be refueled, and the amount of refueling to half of the oil surface mirror shall prevail.
11、If the conveyed medium contains a small amount of metal impurities, a magnetic filter should be installed in front of the inlet pipe.
Installation and trial operation
The support or flange of high viscosity pump and its driving motor should adopt a common installation base, and the base, flange or support should have enough rigidity to reduce the vibration and noise generated when the gear pump is running. The motor and the gear pump shall be connected by flexible coupling, the coaxiality is less than 0.1mm, and the tilt angle shall not be greater than 1 degree. When installing the coupling, do not use a hammer to avoid hurting the gears and other parts of the gear pump. If driven by belt wheel, chain wheel, etc., bracket support should be provided to prevent the active gear shaft from radial force. When fastening the ground screw of gear pump and motor, the screw should be evenly stressed and reliably connected. When turning the coupling by hand, you should feel that the gear pump can rotate easily and there is no abnormal phenomenon such as jamming, and then you can piping. The internal diameter of the suction pipe of the high viscosity gear pump should be large enough, and avoid narrow passages or sharp bends, reduce elbows, remove unnecessary valves and accessories, reduce the installation height of the pump as much as possible, and shorten the length of the suction pipe to reduce pressure loss. The sealing of pipe joints and other components should be good to prevent air intrusion, so as to control the occurrence of cavitation and cavitation. Before starting operation, fill the casing of the gear pump with the liquid to be conveyed to facilitate safe start-up. If the ambient temperature is lower than the freezing point, hot steam should be passed into the pump in advance for preheating treatment before starting the gear pump. The direction of rotation of the gear pump should be in line with the inlet and outlet. If the gear pump is run for the second time, or used again after a long period of inactivity, it should be run for about one hour first under no load or small load. If abnormal temperature rise, leakage, vibration and noise are detected in advance during the run-in phase, it should be stopped for inspection.
The outlet line of high viscosity pumps should also be equipped with protection devices such as safety valves, so that if the outlet channel of the pump is blocked, the safety valve can be opened to unload the pressure. For high viscosity gear pumps that require forward and reverse rotation, safety valves are required on their import and export pipelines.