Do you know the classification of gas cylinders?
Time：
2022-10-20
Cylinders can be divided into the following three categories according to the physical state of the containing medium.
(1) Permanent gas cylinder
The gas whose critical temperature is below -10℃ is called permanent gas, and the gas cylinder containing permanent gas is called permanent gas cylinder. For example, cylinders containing oxygen, nitrogen, air, carbon monoxide and inert gases are of this type. Its common standard pressure series for 15 MPa, 20 MPa, 30 MPa.
(2) Liquefied gas cylinders
Gases whose critical temperature is equal to or higher than -10℃ are gaseous at room temperature and pressure, and become liquid after pressure and cooling. In these gases, some of the critical temperature is higher (higher than 70℃), such as hydrogen sulfide, ammonia, propane, liquefied petroleum gas, etc., known as high critical temperature liquefied gas, also known as low pressure liquefied gas. The cylinders in which these gases are stored are low pressure liquefied gas cylinders. At ambient temperature, the low pressure liquefied gas always exists in the state of gas-liquid coexistence, and the pressure of its gas phase is the saturated vapor pressure of the gas at the corresponding temperature. Considering that the high working temperature is 60℃, the saturated vapor pressure of all liquefied gases with high critical temperature is below 5 MPa, so this kind of gas can be filled with low pressure cylinders. Its standard pressure series is 1.0MPa, 1.6MPa, 2.0MPa, 3.0MPa, 5.0MPa.
(3) Dissolved gas cylinder
The cylinders are specially designed to contain acetylene. Because acetylene gas is extremely unstable, especially under high pressure, it is easy to polymerization or decomposition, acetylene after liquefaction slightly vibration will cause explosion, so it can not be filled with compressed gas state, must be dissolved in the solvent (commonly used acetone), and filled with porous material (such as calcium silicate porous material, etc.) as an absorber. The higher working pressure of dissolved gas cylinder is generally not more than 3.0MPa, and the safety problem has its particularity. For example, acetone ejections in the acetylene cylinder will cause the acetylene cylinder with static electricity, resulting in combustion, explosion, increased acetone consumption and other hazards.
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