Subsurface oil pumps can be roughly divided into four types according to their main USES: subsurface oil pumps for gas stations;Submersible oil pumps for oil depot (refueling vessel) and tanker crane pipe unloading;Oil well oil submersible pump.

Subsurface oil pump for petrol station

1. Overview of the submersible pump at the gas station

The latent oil pump of gas station was developed from the explosion-proof shielded motor produced by franklin company in the 1950s.Franklin's subsurface pump at the gas station is commonly known as "blue", or "blue jacket".American "red jacket" subsurface oil pump is a world famous brand, but the shielded motor it USES is also made by franklin company (since the end of 2012, franklin company and red jacket manufacturer vidette company terminated the supply contract of the shielded motor). China has developed its own subsurface oil pump and put it into the market.

2. Comparison between submersible pump and self-priming pump of refueling machine in gas station

The submersible pump USES the principle of positive pressure push to fundamentally eliminate the phenomenon of gas resistance and completely solve the problems that cannot be solved by the self-priming pump under the conditions of high temperature, high head and long distance, such as low oil output (gas-liquid two-phase), environmental pollution, or even no oil output.In addition, the submersible pump at the gas station can carry multiple guns (4-8 guns), while the self-priming pump can only carry one gun per pump. Therefore, the submersible pump simplifies the oil pipeline and brings great convenience to installation and maintenance, with the highest cost performance.Gb50156-2012-2014 (design and construction specifications for vehicle refueling stations) implemented on March 1, 2013 further pointed out that "the use of subsurface oil pump refueling technology is the trend of the development of gas station technology in China".

3. Selection method of subsurface oil pump in gas station

For the selection of submersible oil pump, the rated voltage of submersible oil pump should be selected according to the power supply voltage of the place of use.When conditions permit, the three-phase submersible oil pump with rated voltage of 380 volts should be selected as far as possible, because the three-phase submersible oil pump motor with the same power of 380 volts has smaller loss, higher efficiency and lower heating than the single-phase submersible oil pump motor with 220 volts.The 220v submersible pump must be distributed, and the capacitance life is much lower than that of the submersible pump, so replacement is inevitable.In addition, the most suitable and efficient submersible oil pump should be selected according to the tank diameter, pipe diameter, pipe length, head, flow and other conditions.Generally, the performance curve of various series of subsurface oil pumps should be selected according to the manufacturer's samples, or the calculation and model selection should be entrusted to the manufacturer.

Subsurface oil pump for oil depot

Used for paying oil and adjusting oil in underground tank.The flow of the submersible pump used in the oil depot (refueling ship) is much larger than that of the petrol station. The submersible pump of green brand can range from 30 to 400 li/h, with a lift of 30 to 50 meters and a maximum power of 20 horses.The subterranean tank pays oil stage to want 50-60 li/hour commonly, pressure still wants 2 kilograms left and right sides, choose 5 above commonly.There is also an "adaptive submersible pump", although the power is small (1 horse) flow, but must be used with pipeline pump.Especially suitable for the original underground tank oil platform has been installed self-priming pump, but due to large air resistance need to be transformed.

Submersible oil pump for unloading oil in crane pipe of railway tank car

The process of oil unloading by railway tank car is very complicated due to the problem of gas resistance.The earliest was the air negative pressure tank priming pump, because safety factors have been suspended.According to the teaching materials of China university of petroleum, there are the following methods for unloading oil from tank cars: overnight unloading method (using low-temperature environment at night), watering method, tank car sealing and filling (inert gas) method, and inverted and layered unloading method.The manufacturing process of submersible oil pump can be divided into hydraulic type and electric type.

1. Hydraulic (crane tube) submersible oil pump

At the end of 1980s, a hydraulic submersible oil pump appeared. Its principle is to transfer energy to the bottom of tank car by hydraulic station and push the pump wheel, that is, electric energy - mechanical energy - hydraulic energy - mechanical energy. Due to multiple conversion of energy, the energy consumption is more than three times that of electric submersible oil pump.Hydraulic submersible pump is solved the problems of gas resistance, but has a high energy consumption, maintenance cycle is short, need to supplement or replace the hydraulic oil (if not timely replacement of hydraulic oil, frozen line areas north of the winter can't unloading), in case of food grade or jet fuel discharge high purity materials, hydraulic submersible pump due to the leakage reason was unable to complete, cost-effective integrated significantly lower than that of electric submersible pump.

2. Electric crane tube submersible oil pump

The electric submersible pump is the latest way of unloading oil in crane pipe of railway tanker.Professor li zili, PhD supervisor of China university of petroleum, affirmed that compared with hydraulic submersible oil pump, electric submersible oil pump has the advantages of maintenance free, long life, no leakage, no pollution, only 1/3 energy consumption and low comprehensive cost.The method to judge the quality of electric submersible pump is to check the warranty period and failure rate of the pump. The best electric submersible pump is the one with long warranty period and low failure rate.Petroleum university textbooks may be rewritten.