What are the common methods for anti corrosion treatment of the inner surface of the fuel tank

The fuel tank can be divided into two types: open fuel tank and closed fuel tank. Open fuel tank, the liquid level in the tank communicates with the atmosphere, and an air filter is installed on the fuel tank cap.

The open fuel tank has a simple structure, easy installation and maintenance, and a hydraulic system.

This form is commonly used. Closed oil tanks are generally used for pressure oil tanks, which are filled with inert gas at a certain pressure.

The inflation pressure can be reached. If it is divided according to the shape of the fuel tank, it can also be divided into rectangular fuel tank and round tank fuel tank. The rectangular fuel tank is easy to manufacture, and the hydraulic devices are easy to be placed on the box, so it is widely used; The round tank tank has high strength, light weight and easy to clean, but it is difficult to manufacture and occupies a large space, so it is often used in large metallurgical equipment.

The following points should be taken into account when designing a fuel tank:

1) The fuel tank must have a large enough volume. On the one hand, it should meet the requirements of heat dissipation as much as possible, and on the other hand, it should be able to accommodate all the working media in the system when the hydraulic system is stopped working, and maintain the appropriate liquid level when working.

2) The suction pipe and return pipe should be inserted below the minimum liquid level to prevent bubbles from being caused by the sucking and return splashing. The distance between the nozzle and the bottom and wall of the box is generally not less than 3 times the diameter of the pipe. The suction pipe can be installed with a mesh or line gap filter of about l00 m, and the installation position should be convenient for loading, unloading and cleaning the filter.

The return nozzle should be beveled to 45°. The corners are also facing the tank wall to prevent the oil return from hitting the deposits at the bottom of the tank and also to facilitate heat dissipation.

3) The distance between the suction pipe and the oil return pipe should be as far as possible, and a partition should be set between them to increase the way of liquid circulation, which can improve the effect of heat dissipation, air separation and precipitation of impurities. The height of the partition is 2 3 3 4 of the liquid level height.

4) In order to keep the oil clean, the oil tank should have a perimeter sealed cover, and the cover plate is equipped with an air filter, and the oil filling and ventilation are generally done by an air filter. In order to facilitate oil drain and cleaning, the bottom of the tank should have a certain slope, and the oil drain valve should be set at the lowest place. For the fuel tank that is not easy to open the cover, a cleaning hole should be set up to facilitate the cleaning of the inside of the fuel tank.

5) The bottom of the fuel tank should be more than 50mm from the ground to facilitate handling, oil discharge and heat dissipation. Lifting lugs should be set up in the appropriate position of the fuel tank for lifting, and a level gauge should also be set.

to monitor the liquid level.

6) Full attention should be paid to the anti-corrosion treatment of the inner surface of the fuel tank. Commonly used methods are:

1) Phosphating after pickling. It is suitable for all media, but due to the limitation of the pickling phosphating tank, the oil tank should not be too large.

2) Apply anti-rust oil directly after shot blasting.

Suitable for general mineral oil.

and synthetic hydraulic fluids.

Not suitable for aqueous hydraulic fluids. Because it is not limited by the processing conditions, this method is more often used in large fuel tanks.

3) Thermal spraying of alumina after sandblasting. Suitable for dewater-glycol.

outside of all media.

4) Spray plastic after sandblasting. Suitable for all media. However, due to the limitation of drying equipment, the fuel tank should not be too large.

When considering the anti-corrosion treatment of the inner surface of the fuel tank, it is necessary to consider not only the compatibility with the medium, but also the machinability after treatment, the time interval between manufacturing and put into use, and the economy, and the use of stainless steel fuel tank is the ideal choice when conditions permit.

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