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Filling principle of cryogenic Dewar
Date: Jun 08, 2020
Dewar filling principle:
1. Filling principle: the pressure difference between the storage tank and the Dewar is used for direct filling.
Make sure that the media to be filled is the same as the media in the Dewar. If it is different, it must be filled after the cylinder is completely emptied.
Warning: Before filling, the medium in the pressure vessel and the filling medium should be confirmed.
2. Determine the correct total filling weight of the gas cylinder, which is the sum of the empty bottle weight, the filling line weight and the maximum filling weight shown on the Dewar nameplate in the "Performance Parameter Table". Do not overcharge the pressure vessel.
3. Connect the inlet and outlet valves of the Dewar flask to the supply source, and tighten with a special hose without leakage.
4. Open the exhaust valve and inlet and outlet valves on the Dewar, open the outlet valve on the storage tank and the check valve on the filling pipe, and start filling.
Warning: Filling should be carried out in a well-ventilated place, because the accumulation of gas is very dangerous.
5. During the filling process of the gas cylinder, use a pressure gauge to monitor the pressure in the cylinder and adjust the discharge valve to keep the pressure between 0.07 and 0.1mpa (10-15psi).
6. During the entire filling process of the pressure vessel, it is necessary to observe the pressure of the Dewar liner and adjust the "vent valve" to keep the liner pressure at 10-15 psig (excluding carbon dioxide liquid).
7. When the total filling weight is reached, close the inlet and outlet valves on the Dewar] and the outlet valve"].
8. Close the shut-off valve in the filling pipe and open the exhaust valve in the filling pipe to make all the remaining liquid and gas in the filling pipe empty.
9. Remove the hose and Dewar from the scale.
Note: The pressure of the filled Dewar rises rapidly, which may cause the safety valve to open.
Note: After surgery on liquid oxygen or liquefied natural gas, due to the possibility of splashing with liquid oxygen or liquefied natural gas, please be careful not to smoke or get close to fire immediately.
Note: When the saturation pressure of liquid carbon dioxide drops to 0.48mpa (70psi), the liquid carbon dioxide will form solid dry ice. Fill liquid with 1751/195/210 and 4991 Dewars
When carbon dioxide is oxidized, the carbon dioxide gas in the cylinder must be filled.
1. Filling principle: the pressure difference between the storage tank and the Dewar is used for direct filling.
Make sure that the media to be filled is the same as the media in the Dewar. If it is different, it must be filled after the cylinder is completely emptied.
Warning: Before filling, the medium in the pressure vessel and the filling medium should be confirmed.
2. Determine the correct total filling weight of the gas cylinder, which is the sum of the empty bottle weight, the filling line weight and the maximum filling weight shown on the Dewar nameplate in the "Performance Parameter Table". Do not overcharge the pressure vessel.
3. Connect the inlet and outlet valves of the Dewar flask to the supply source, and tighten with a special hose without leakage.
4. Open the exhaust valve and inlet and outlet valves on the Dewar, open the outlet valve on the storage tank and the check valve on the filling pipe, and start filling.
Warning: Filling should be carried out in a well-ventilated place, because the accumulation of gas is very dangerous.
5. During the filling process of the gas cylinder, use a pressure gauge to monitor the pressure in the cylinder and adjust the discharge valve to keep the pressure between 0.07 and 0.1mpa (10-15psi).
6. During the entire filling process of the pressure vessel, it is necessary to observe the pressure of the Dewar liner and adjust the "vent valve" to keep the liner pressure at 10-15 psig (excluding carbon dioxide liquid).
8. Close the shut-off valve in the filling pipe and open the exhaust valve in the filling pipe to make all the remaining liquid and gas in the filling pipe empty.
9. Remove the hose and Dewar from the scale.
Note: The pressure of the filled Dewar rises rapidly, which may cause the safety valve to open.
Note: After surgery on liquid oxygen or liquefied natural gas, due to the possibility of splashing with liquid oxygen or liquefied natural gas, please be careful not to smoke or get close to fire immediately.
Note: When the saturation pressure of liquid carbon dioxide drops to 0.48mpa (70psi), the liquid carbon dioxide will form solid dry ice. Fill liquid with 1751/195/210 and 4991 Dewars
When carbon dioxide is oxidized, the carbon dioxide gas in the cylinder must be filled.
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