What are the safety precautions for using cryogenic liquid tanks?

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Answer: 1) Overpressure is strictly prohibited inside the tank during use. Operators must receive systematic training to understand the properties of liquefied gases as well as the structure and principles of cryogenic tank trucks; they must also be familiar with explosion-proof safety measures and fire safety regulations, and possess the necessary operation certificates. When operating, they must follow the procedures strictly and be able to resolve faults correctly. 2) When the filling medium is liquid oxygen, it is strictly prohibited to use tools and protective equipment containing grease, as well as steel tools that may generate sparks. A rubber mallet or brass mallet should be used. 3) All valves should be opened and closed slowly to avoid rapid and forceful movement; the valves must not be tightened too much to prevent damage to the valve core. If a valve freezes due to low temperatures and fails to close properly or cannot be opened, it is strictly prohibited to use forceful tools to try to open or close it; instead, it should be heated with hot water before attempting to operate it. 4) Appropriate protective equipment, such as coarse-gauge gloves and safety helmets, should be worn during operation to prevent the cold liquid from damaging the skin. 5) If the hose connector gasket is too thin or does not seal properly, causing leakage, this issue can be resolved by wrapping it with black electrical tape. 6) Pay close attention to whether there is any significant large-scale \"exudation\" on the outer wall of the tank; if so, use should be stopped immediately and the cause identified as soon as possible. 7) If an abnormal increase in the pressure of the storage tank is detected, it is necessary to immediately check whether the pressure increase valve is not closed or if there is insufficient insulation. If the pressure increase valve is not closed, it should be closed; if the insulation is inadequate, the liquid should be drained immediately and further action taken. 8) When out of use for an extended period, the liquid inside the tank must be completely drained, and the vent valve should be left slightly open to prevent overpressure in the absence of supervision. 9) In the event of a large-scale liquid leak, personnel entering the area must wear long-tube respirators as well as appropriate protective gear. 10) When repairing the vehicle, dry hot air or dry nitrogen should be used first for purging; welding can only be carried out once the oxygen level in the tank reaches normal values. 11) The grounding device must be in good condition; it is strictly prohibited to use iron chains as grounding wires. 12) The vehicle’s engine exhaust pipe must not be directed toward the rear of the vehicle, to prevent liquid from coming into contact with sparks in the event of a leak in the tanks, pipes, or valves, which could lead to accidents. 13) It is strictly prohibited to remove the hose without first opening the pipeline residue vent valve, to prevent liquid from spraying and causing injury.