Q: How do cryogenic storage tanks work?
 The cryogenic tank is constructed like, in principle, a vacuum bottle. It is designed to keep heat away from the liquid that is contained in the inner vessel. Vaporizers convert the liquid nitrogen to its gaseous state. A pressure control manifold controls the pressure at which the gas is fed to the process.

Q: What is difference between LNG and CNG?
LNG is the acronym for Liquefied Natural GasCNG is the acronym for CompressedNatural GasLNG is liquefied cryogenically and is actually under very low pressure. CNG is compressed under very high pressure, typically over 200 bars, but it is not very economical for long distance transport.

Q: What is the capacity of CNG tank?
A: Cylinder with a 50 liter water-carrying capacity is capable of carrying approximately 9kg of CNG. This is equivalent to 12.5 litres of petrol and will allow a run of about 150-160 km to a medium-sized 1300 CC car.

Q: How many Litres is 1 kg of CNG?
A: 5 litres. How much does CNG cost approximately? CNG supplied by filling stations is measured in kilogrammes. 1 kg of CNG (year 2018) costs approximately 0,99 euro/kg and corresponds to about 1,5 litres of petrol. 

Q: How long will liquid nitrogen last in a Dewar flask?
A: Assuming that this is a well-maintained high-vacuum Dewar of typical commercial construction, I would expect a hold time of at least 6 months. The Dewar manufacturershould list specifications for either static hold time or normal evaporation rate.

Q: How long does liquid nitrogen last in a tank?
A:  They can often last over 100 days if filled properly and not opened.