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Emergency treatment of cryogenic Dewar
Date: Jun 19, 2020
1. The dress code for emergency treatment personnel of Dewar
Eye or skin contact with low-temperature liquid can cause cold burns like burns. Be careful not to splash or spill the low-temperature liquid. To protect the eyes, skin and other parts that are easily in contact with cryogenic liquids, wear protective glasses or face shields; it is recommended to wear protective gloves and long sleeves that are easy to take off to protect the arms; wear trousers without cuffs , The trousers should cover the shoes to block the overflowing low-temperature liquid. The clothing of emergency responders for pressure vessels should be made of cotton, preferably with no pockets or rolled up parts. It is strictly prohibited to wear chemical fiber clothing that may cause static electricity, and wear leather shoes without iron nails on the feet.
2. When the dewar is in a fire environment
At this time, all valves of the gas cylinder that communicate with gas and liquid phase should be closed in time. When the valve can't be closed or the leak can't be blocked, don't spray the liquid leak directly with water, it is recommended to use dry powder (preferably potassium carbonate) fire extinguisher.
3. When the Dewar is under overpressure relief
At this time, the discharge valve should be opened in time, and the overpressure gas in the gas cylinder should be released to the normal seat of the safety valve as soon as possible. When discharging oxygen or natural gas into the air, it should be determined in advance that there are no open flames, no flammable materials, and no pedestrians in the vicinity. If the depressurization effect of the exhaust gas is poor, move the gas cylinder to an open place, connect the delivery hose, and open the inlet and outlet valve (DPL cylinder)/outlet valve (DPW cylinder) to empty when the exhaust valve is empty.
Note: The vented liquid is not allowed to drain into the underground drain.
4. When the inner container of the Dewar accidentally leaks
At this time, the pressure vessel is under excessive pressure due to internal liquid leakage, which will cause and cause an accident. The liquid in the bottle should be carefully discharged as soon as possible or unloaded into other intact similar bottles. When conditions permit, the damaged bottle should be transferred to a place free of open flames, flammables, and pedestrians for emergency treatment as soon as possible.
5. When the Dewar valve is frozen
If the valve of the pressure vessel is frozen, it should be thawed with clean, oil-free warm water or hot nitrogen before operation. Do not use a hammer or other objects to forcefully open the cylinder
Eye or skin contact with low-temperature liquid can cause cold burns like burns. Be careful not to splash or spill the low-temperature liquid. To protect the eyes, skin and other parts that are easily in contact with cryogenic liquids, wear protective glasses or face shields; it is recommended to wear protective gloves and long sleeves that are easy to take off to protect the arms; wear trousers without cuffs , The trousers should cover the shoes to block the overflowing low-temperature liquid. The clothing of emergency responders for pressure vessels should be made of cotton, preferably with no pockets or rolled up parts. It is strictly prohibited to wear chemical fiber clothing that may cause static electricity, and wear leather shoes without iron nails on the feet.
2. When the dewar is in a fire environment
At this time, all valves of the gas cylinder that communicate with gas and liquid phase should be closed in time. When the valve can't be closed or the leak can't be blocked, don't spray the liquid leak directly with water, it is recommended to use dry powder (preferably potassium carbonate) fire extinguisher.
3. When the Dewar is under overpressure relief
At this time, the discharge valve should be opened in time, and the overpressure gas in the gas cylinder should be released to the normal seat of the safety valve as soon as possible. When discharging oxygen or natural gas into the air, it should be determined in advance that there are no open flames, no flammable materials, and no pedestrians in the vicinity. If the depressurization effect of the exhaust gas is poor, move the gas cylinder to an open place, connect the delivery hose, and open the inlet and outlet valve (DPL cylinder)/outlet valve (DPW cylinder) to empty when the exhaust valve is empty.
Note: The vented liquid is not allowed to drain into the underground drain.
At this time, the pressure vessel is under excessive pressure due to internal liquid leakage, which will cause and cause an accident. The liquid in the bottle should be carefully discharged as soon as possible or unloaded into other intact similar bottles. When conditions permit, the damaged bottle should be transferred to a place free of open flames, flammables, and pedestrians for emergency treatment as soon as possible.
5. When the Dewar valve is frozen
If the valve of the pressure vessel is frozen, it should be thawed with clean, oil-free warm water or hot nitrogen before operation. Do not use a hammer or other objects to forcefully open the cylinder
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