Suctioning Oil From Underground Tanks

The red jacket submersible pump is a multi-stage centrifugal pump. When the unit is started, the submersible motor drives the oil pump shaft and the impeller on the shaft to rotate at high speed. During this process, the liquid in the impeller flows around the blades. During the flow, the liquid acts a lift on the blades. In turn, the blades act on the liquid with a force equal to the lift and opposite to the lift. This force works on the liquid, so that the liquid gains energy and flows out of the impeller. At this time, the kinetic energy and pressure energy of the liquid increase. The liquid flowing out of the impeller directly enters the extrusion chamber in the guide housing. The extrusion chamber collects this part of the liquid, appropriately reduces the flow speed of the liquid, converts part of the kinetic energy into pressure energy, and then introduces this part of the liquid into the other end of the guide housing - the suction chamber, for the next stage of impeller suction. In this way, the liquid flows through all the impellers and guide housings in the pump step by step. Every time it flows through a stage of impellers and guide housings, its pressure energy increases once. After the pressure energy is superimposed step by step, a certain amount of energy is added at the outlet of the submersible pump, generating a certain head, thus achieving the purpose of pumping liquid.

Submersible fuel pump is a special type of pumping equipment, mainly used to extract liquids from underground tanks or wells. It is often used in gas stations to extract gasoline, diesel and other fuels from underground tanks and refuel vehicles through fuel dispenser.

The red jacket submersible oil pump consists of a pump head and a motor. The pump head consists of a pump cap and a pump seat. The pump cap is the upper part of the pump head, including the power connection chamber, bridge, capacitor chamber, exhaust threaded plug, check valve, pressure regulating assembly, exhaust and pressure test interface, pipeline leak detector (optional); the pump seat is the lower part of the pump head, including the oil pipe access port, wire access port, oil outlet interface, and oil pump support pipe port. The lower half consists of the motor, wire connector, overheat protector, oil channel, oil cover, anti-static assembly, impeller and pump shaft, etc.

Submersible pumps use the principle of positive pressure oil delivery, which has the following advantages:

1. Make full use of the advantages of positive pressure oil delivery, and the layout design of the oil station is flexible to meet the needs of large-flow guns, multiple oil products, and multiple guns to deliver oil products

2. The same oil product shares the main oil pipeline, reducing the difficulty and cost of construction

3. Applying the siphon principle, multiple oil tanks of the same oil product are operated in parallel, which is equivalent to increasing the oil storage tank

4. Eliminate cavitation phenomenon, and have greater flexibility for oil properties, temperature and altitude

5. Low failure rate, reducing the maintenance cost of the oil station

30% of the direct failures of self-priming pump refueling machines are self-priming pump failures, that is, an average of 0.68 failures per self-priming pump per year. The average maintenance frequency of self-priming pumps is 3 times/year.

The failure rate of submersible pumps is <0.5%, and the same parts of the refueling machine need to be maintained once every 4 to 5 years on average. Due to the vibration generated by the operation of the self-priming pump, the failure rate of the self-priming pump refueling machine is significantly higher than the failure rate of the same parts of the submersible pump.

‌Precautions for using submersible oil pumps include the following aspects‌:

‌Inspection before startup‌:

1. Check whether the submersible oil pump body and infusion pipeline are firmly installed, and whether the wiring system is correct and undamaged‌

2. Check whether the submersible pump casing has cracks, whether the seals of the vent hole, water drain hole, oil drain hole and cable joint are loose, and whether the insulation resistance meets the requirements (not less than 5MΩ)‌

3. Ensure that the cable is not damaged or broken, and the cable should be suspended and not too long‌

‌Inspection during startup‌:

Manual start and stop: Close the main power switch, press the run button to start the submersible oil pump, and press the stop button to stop‌

1. Automatic start and stop: Turn the conversion switch to the remote working position, and the upper computer controls the start and stop (applicable to products with remote control function)‌

2. Avoid frequent startup, and there should be at least 2 minutes between stopping the pump and starting the pump‌

‌Inspection and maintenance during operation‌:

Avoid starting the submersible oil pump when the medium is crystallized or not completely melted.‌

1. Check whether the infusion pipeline is leaking, whether the liquid output is normal, whether there are too many solid impurities or impeller jamming.

2. Ensure that the explosion-proof control box is well ventilated and heat-dissipated to avoid covering with debris.

3. Regularly check whether the power cord and plug are intact and whether there is any damage or burning.

4. Check the wear of the pump shaft, bearings, and impeller, and replace damaged parts in time.

5.  Regularly clean the dirt and dust inside and outside the pump body to prevent blockage and wear.

6.  Regularly replace the lubricating oil that meets the regulations to ensure the normal operation of the pump.

7.  Check whether the mechanical seal is intact and installed correctly.

8. Power safety and mechanical inspection: Before any maintenance work, the power must be disconnected to ensure that the electric submersible pump is completely stopped.

9.  Use qualified electrical tools and equipment, and avoid using damaged or aging wires and plugs.

10.  Regularly check whether the power cord and plug are intact and whether there is any damage or burning.