Cold King agents are here to talk about the surface treatment of refrigerated truck fuel tanks. Firstly, they advocate making a nozzle to clean the fuel tank with compressed air. The nozzle is a 1m long thin steel pipe, with one end plugged at the bottom and several 1mm diameter holes drilled around the lower end.

(1) Open the oil drain switch of the refrigerated truck's fuel tank, drain all the oil, close the drain switch and fuel supply switch, remove the fuel tank cover, oil filter, and dipstick, and inject 20-40L of clean diesel into the tank as clean oil (depending on the tank capacity).

(2) Connect the air pump hose to the nozzle and place the lower part of the nozzle into the bottom of the fuel tank. When the air pressure in the air pump storage tank rises to 0.6~0.7 MPa, open the gate valve to allow high-speed airflow to rush into the oil layer at the bottom of the fuel tank through the nozzle, causing diesel to surge and splash, thus flushing and cleaning the inside of the fuel tank. When cleaning, the air pressure of the gas storage tank should be maintained at 0.4~0.5MPa. To prevent oil mist from spraying out of the fuel tank, the fuel tank opening should be blocked with gauze to avoid affecting the left and right swing of the nozzle.

(3) Close the valve of the gas storage tank, remove the nozzle, drain the clean oil from the tank, add 15-30L of clean diesel, and clean again according to the above method. After cleaning, empty the cleaning oil, install the oil filter, dipstick, and tank cap, and complete the tank cleaning operation. The discharged cleaning oil can be used to clean other fuel tanks.

From the perspective of refrigerated truck manufacturers, the above cleaning methods can only be used for diesel tanks and cannot be used for gasoline tanks. Due to the static electricity generated by the friction between compressed air and tank walls, and the flammability and explosiveness of gasoline, even in extremely cold conditions of -30 ℃, small sparks can ignite gasoline, causing security accidents.