Precautions for filling cryogenic liquid tank trucks at our factory
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1. Check that all vehicle documents are in order. 2. The tank truck must be in a braked state before the infusion tube is connected; it should be moved away promptly after filling is complete. If the filling process is interrupted for an extended period (overnight or during holidays), the connection to the infusion tube should be disconnected. 3. The tank truck must be equipped with a fire shield, and the engine must be turned off during filling operations. 4. Take precautions to prevent frostbite. 5. When valves, instruments, and connections on the equipment freeze, it is strictly forbidden to use hammers or open flames to thaw them; instead, clean, oil-free hot air at 70–80°C, hot nitrogen, or warm water should be used for thawing. 6. When filling with liquid oxygen, gloves and work clothes must not contain any grease. If the clothing of the filling personnel has become saturated with oxygen, they must not enter areas with open flames; their clothing should be changed if necessary. The purge time in the atmosphere shall be no less than 15 minutes
Place shims between the wheels； Check the filling medium; if necessary, check the purity inside the tank car
In terms of actual performance, many of our staff do not know the steps for filling tank trucks nor the safety requirements! If safety is needed, genuine efforts must be made to ensure that everyone understands the importance of safety – safety first!
1. “Tank trucks with 3 compartments must be equipped with fire shields, and the engine of such trucks must be turned off during filling operations.” Correction: Many trucks now come equipped with built-in liquid transfer pumps; in order to speed up the filling process, these pumps are driven by an on-board generator. This regulation is not appropriate； Second, “1. Check whether the vehicle’s documents are complete” falls under the jurisdiction of traffic management departments and inspection agencies, which is inappropriate ； III. “When the valves, instruments, and connection fittings on the equipment freeze,” this is considered a cold flow issue that needs to be addressed promptly ； IV. \"It is strictly prohibited to use a hammer or heat with an open flame; instead, clean, oil-free hot air at 70–80°C, hot nitrogen, or warm water should be used for thawing. Copper hammers and wrenches should be available, and thawing should be carried out using steam heat.\" ； It is necessary to wear clothing that reduces the risk of static electricity, as well as shoes with metal components, in order to prevent sparks from forming. Protective goggles should be worn to avoid eye damage caused by splashing liquids. It is forbidden to pour liquids or gases in reverse to prevent contamination of the storage tanks. Before filling, the pipes, valves, and liquid pumps must be thoroughly pre-cooled. When closing valves, do not use excessive force, as this may damage the seals. (For reference)