Correct use of Dewar flask

With the continuous development of the special gas industry, there is an increasing demand for pressure vessels such as Dewar used to carry special gases in the industry, and its effect is also increasingly prominent, despite the various pressure vessel products such as Dewar It has achieved good development in the industry, but some common knowledge about dewar is estimated to be very few people understand. Although it is widely used, it is not common in our daily life. For this we need to know the operating procedures of gas cylinders. Have a certain understanding.
　　
1. Ensure that the pressure vessel operation environment has excellent ventilation conditions, and the oxygen content in the air should be higher than 18% (volume concentration).
　　
2. All equipment (including connectors, pipes and valves) on the Dewar tank must not be stained with flammable materials such as oil and grease.
　　
3. The valve of the gas cylinder should be opened slowly by hand. If the valve is damaged, you may not be able to open it by hand. Do not use a wrench or other things to force it to open. You should contact the pressure vessel manufacturer immediately. 4. If the valve and other equipment are frozen, suitable methods such as hot water should be used to freeze. Do not use an open flame to thaw, and do not use hammers or other objects to strike the Dewar. Prevent any part of the tank/dewar from being repaired or tightened under pressure.

5. Do not use liquid nitrogen Dewar in places with poor ventilation conditions such as basements, semi-basements or recesses.