The light crude oil pump for underground tanks with twin - screws belongs to an external - meshing screw pump, which relies on two mutually - meshing but non - contacting screws to pump light crude oil.
The driving screw, with one end extending outside the pump, is driven by the prime mover. The driving screw and the driven screw have threads of different rotation directions. The driven screw is driven by the driving screw through a synchronous gear.
When the driving screw rotates, it drives the driven screw to rotate synchronously. The screws fit closely with the pump body, forming sealed chambers between the screws and the pump body, as well as between the screws. As the screws rotate, the sealed chambers continuously move from the inlet to the outlet, sucking in the light crude oil from the inlet and pushing it to the outlet for discharge, thus achieving the transportation of light crude oil.
Double - suction Structure: Adopting a double - suction structure, both ends of the screw are in the same pressure chamber. The axial force can be balanced by itself, reducing the load on the bearings and improving the stability and service life of the pump.
External Bearings: The bearings at both ends are externally installed and are lubricated separately with lubricating oil (grease). They are not affected by the transported medium, enabling the pump to transport various non - lubricating media, including cases where there may be a small amount of impurities in the light crude oil.
Synchronous Gear Drive: A pair of synchronous gears is used to drive the two screws. There is a small gap between the tooth surfaces of the screws without contact. Impurities in the medium will not directly wear the tooth surfaces of the screws, and it is okay even if the pump runs idle for a short time.
Safety Valve Design: Generally, an internal - flow safety valve is installed on the pump body. When the discharge pressure exceeds the rated value, it can play a certain protective role, preventing the pump and pipeline from being damaged due to excessive pressure.
Smooth Transportation: The liquid is transported smoothly, without pulsation, agitation, with low vibration and noise. This is beneficial to the stability of the environment around the underground tank and the safe operation of the equipment, reducing the impact on surrounding facilities and personnel.
Strong Self - priming Ability: It has a strong self - priming performance. When extracting light crude oil from underground tanks, it can quickly establish a suction effect, pumping the crude oil out of the tank and improving work efficiency.
Multiphase Mixed Transportation: During multiphase mixed transportation, the gas content is not higher than 80% and the sand content is not higher than 500g/m³. It can adapt to the situation where there may be a small amount of gas, sand and other impurities in the light crude oil, ensuring smooth transportation.
Wide Application Range: It can transport various clean media or media with solid small particles, with low or high viscosity. It has good adaptability to different viscosity ranges of light crude oil and possible trace impurities.
Oilfield Exploitation: It is used to extract light crude oil from locations such as underground oil depots and wellheads, and transport the crude oil from underground tanks to the ground for subsequent treatment and transportation.
Petrochemical Industry: In the processes of petroleum refining and chemical production, it is used to transport light crude oil to various processing equipment, such as distillation towers and reaction kettles, providing a stable supply of raw materials for the production process.
Oil Depot Transfer: In oil depots, it is used to transport light crude oil from underground tanks to other storage equipment or transportation tools, such as oil tank trucks and oil tankers, to achieve the storage and transportation allocation of crude oil.
