High-viscosity pumps that deliver high-viscosity liquids should deliver the most flow at lower power, less leakage, and greater pressure. When determining the medium to be transported, the product specification should be strictly followed, and the fluid medium recommended by the manufacturer should be used as much as possible, and the operating temperature range of the system should be considered.
The viscosity index of the transport medium should be higher when it is desired to use it over a wide temperature range. When the viscosity of the transport liquid is high, or when the system is operating in a cold environment, it must be ensured that the transport medium can flow smoothly.
Many oils contain waxy components that are easily crystallized at low temperatures and the transport medium should have a freezing point below the expected minimum operating temperature. In addition, the medium to be transported must be compatible with the rubber material such as seals, gaskets, hoses, etc. in the system. If the two are incompatible, the transport medium must be redefined.
The transport medium is not only an intermediary for energy transfer, but also a lubricant, seal and heat transfer medium. Excessive viscosity of the liquid will increase the internal frictional resistance, reduce the output power, waste energy, and produce excessive system temperature. The high-viscosity pump should also be equipped with a safety valve such as a safety valve on the outlet line, so that once the outlet passage of the pump is blocked, It is possible to open the safety valve to relieve pressure. The rated pressure of a high-viscosity pump refers to the maximum allowable pressure when the pump is continuously operated, and the working pressure is determined by the external load.
The life of the pump is directly related to its working pressure. For rotor pumps that do not work frequently, the working pressure can be taken as the rated pressure of the pump. Considering the difference in product quality, it is best to reduce the rated pressure by 20% to 30%. For rotor pumps that are often operated at higher pressures, the operating pressure should be one to two pressure levels lower than the rated pressure of the pump. Petrochemical equipment is often operated continuously for 24 hours.
At this time, the working pressure of the pump should be much lower than the rated pressure, and the working speed should also be lower than the rated speed. If the working pressure of the high viscosity pump is adjusted too high, the rotor pump will operate under overload.
