Cryogenic cylinder is a type of container that is specifically designed to store materials at very low temperatures, typically below -150°C (-238°F). These containers are typically made of materials that can withstand the extreme temperatures and are heavily insulated to minimize heat transfer.
Cryogenic cylinders are commonly used to store liquefied gases, such as liquefied natural gas (LNG), liquid nitrogen, or liquid oxygen. These gases are cooled to their liquid state and then stored in the cryogenic cylinder.
The cryogenic cylinder works by using a vacuum-insulated inner vessel that holds the liquefied gas, surrounded by an outer vessel or jacket. The vacuum layer between the inner and outer vessels reduces heat transfer, allowing the cryogenic liquid to remain at a very low temperature for an extended period.
The liquefied gas is stored in the cylinder at very low pressures and temperatures, and a pressure relief valve is installed to ensure safe operation. When the cryogenic liquid is needed, it can be withdrawn through an outlet valve at the top of the cylinder, which is connected to a transfer hose or piping system.
Cryogenic cylinders are commonly used in a variety of industries, including healthcare, research, and energy, due to their ability to safely store and transport materials at very low temperatures.
Types of Cryogenic Cylinder
There are several types of cryogenic cylinders, but the two most common types are:
Dewar Flask: This is a simple, low-pressure, double-walled container that is used for small quantities of cryogenic fluids. Dewar flasks are commonly used in laboratories and medical facilities to store liquid nitrogen and other cryogenic fluids.
Cryogenic Liquid Cylinder: This type of cylinder is a high-pressure vessel that is designed to store and transport larger quantities of cryogenic fluids. Cryogenic liquid cylinders are typically used in industrial applications and can store several hundred to several thousand liters of cryogenic fluids.
Other less common types of cryogenic cylinders include cryogenic storage tanks, which are large stationary tanks used for bulk storage of cryogenic fluids, and cryogenic trailers, which are mobile tankers used for transporting large quantities of cryogenic fluids over long distances.
When it comes to storing LNG, the best type of cryogenic cylinder to use is the cryogenic liquid cylinder. This is because LNG must be stored at very low temperatures (-162°C or -260°F) and under high pressure to remain in its liquid state. Cryogenic liquid cylinders are designed to withstand these extreme conditions and are also designed to minimize heat transfer, which helps to keep the LNG at the required temperature.
Cryogenic liquid cylinders are also equipped with safety features, such as pressure relief valves and rupture discs, to ensure safe operation. Additionally, they are designed to be easily transported, which makes them ideal for the storage and transportation of LNG.
Static Evaporation Rate
The static evaporation rate is the rate at which cryogenic fluids, such as liquid nitrogen or liquid oxygen, evaporate from a cryogenic container when it is not being actively used or filled.
The static evaporation rate is dependent on several factors, including the type of cryogenic fluid, the size and design of the container, the insulation quality of the container, and the ambient temperature.
Over time, cryogenic fluids stored in a container will slowly evaporate due to heat transfer from the surroundings, even if the container is well-insulated. The static evaporation rate is the rate at which this natural evaporation occurs and is typically measured in terms of the amount of cryogenic fluid lost per day or per hour.
The static evaporation rate is an important consideration for the safe and efficient use of cryogenic fluids. It is important to monitor the static evaporation rate of cryogenic containers to ensure that they are being used efficiently and that they do not run out of cryogenic fluid unexpectedly.