Dewar filling steps

Before filling the Dewar with cryogenic liquid, first determine the filling medium and filling quality of the gas cylinder. To ensure accurate filling of pressure vessels, please use a weighing scale.

1. Connect the gas cylinder inlet and outlet valve (DPW gas cylinder is the liquid inlet valve) to the supply source with a special delivery hose, and tighten the pressure vessel without leakage.
　　
2. Open the discharge valve and inlet and outlet valves of the Dewar, then open the supply valve to start filling the pressure vessel.
　　
3. In the process of filling the Dewar, monitor the pressure in the cylinder through the pressure gauge and adjust the discharge valve to keep the pressure at 0.07~0.1MPa.
　　
4. When the Dewar reaches the required filling quality, close the inlet and outlet valves, discharge valves and supply valves.
　　
5. Remove the delivery hose and remove the gas cylinder from the scale.
　　
Warning: It is strictly prohibited to overfill the pressure vessel.
Warning: Confirm the medium in the cylinder and the filling medium before filling.
Warning: Filling should be carried out in a well-ventilated place, because the accumulation of gas is very dangerous. Note: The pressure of a fully filled gas cylinder rises very quickly, which may cause the safety valve to open.

Caution: Just after performing operations related to liquid oxygen or LNG, as there is a possibility that liquid oxygen or LNG may be splashed on the clothes, please be careful not to smoke or approach a fire place immediately.
　　
Note: When the saturation pressure of liquid carbon dioxide drops to 0.48MPa (70 psi), the liquid carbon dioxide will form solid dry ice. Therefore, when using DPL450-175H/195H/210H, DPL450-175V/195V/210V, DPW650-499H gas cylinders to fill liquid carbon dioxide, the carbon dioxide gas in the cylinder must be pressurized before the pressure vessel can be filled.