(1) The fuel tank must have a sufficient volume. On the one hand, it should meet the requirements of heat dissipation as much as possible, and on the other hand, when the hydraulic system stops working, it should be able to accommodate all the working medium in the system, while maintaining an appropriate liquid level during operation.
(2) The oil suction pipe and oil return pipe should be inserted below the minimum liquid level to prevent air bubbles from splashing and returning oil. The distance between the nozzle and the bottom of the box and the wall of the box is generally not less than 3 times the diameter of the pipe. The oil suction pipe can be installed with a mesh or line-gap filter of about 100 μm, and the installation position should be convenient for loading and unloading and cleaning the filter. The oil return pipe should be beveled at 45°. Angled and facing the tank wall to prevent the return oil from hitting the deposits at the bottom of the tank, and also to facilitate heat dissipation.
(3) The distance between the oil 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 flow 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 peripherally sealed cover plate, and an air filter is installed on the cover plate. Oil filling and ventilation are generally completed by an air filter. In order to facilitate oil draining and cleaning, the bottom of the box should have a certain slope, and a drain valve should be set at the lowest point. For fuel tanks that are not easy to open, a cleaning hole should be provided to facilitate the cleaning of the interior of the fuel tank.
(5) The bottom of the fuel tank should be above l50mm from the ground to facilitate handling, oil discharge and heat dissipation. The lifting lugs should be set at the appropriate position of the fuel tank for lifting and transportation, and the liquid level gauge should be set to monitor the liquid level.
(6) Sufficient 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. Applicable to all media, but limited by pickling and phosphating tank, the oil tank should not be too large.
2) Apply anti-rust oil directly after shot peening. Suitable for general mineral oil and synthetic hydraulic oil, not suitable for water-containing hydraulic fluid. Because it is not limited by processing conditions, this method is mostly used in large fuel tanks.
3) Thermally sprayed alumina after sandblasting. Suitable for all media except water-glycol.
4) Spray plastic after sandblasting. Works with all media. However, due to the limitation of drying equipment, the fuel tank cannot be too large.
When considering the anti-corrosion treatment of the inner surface of the oil tank, not only the compatibility with the medium, but also the machinability after treatment, the time interval between manufacture and putting into use, and the economy should be considered. The ideal choice.