What is gas cylinder classification?

1. Classification by manufacturing method

Depending on the manufacturing method, cylinders can be divided into the following four categories.

(1) Welding gas cylinders

The welded cylinder consists of a cylindrical cylinder welded to a thin steel coil and a head welded at both ends. Welded gas cylinders are mainly used for low pressure liquefied gas, such as liquefied sulfur dioxide.

(2) Adjust the gas cylinder

The regulating cylinder is a seamless cylinder made of seamless steel pipe. The heads at both ends are received and formed by heating the steel pipe by means of screw or extrusion on a special machine tool.

(3) Push and pull the gas cylinder

The ingot is heated after stamping the concave head, and then pulling out the corkscrew bit, and then making the top and interface pipe according to the method of gas cylinder control.

(4) Rolling gas cylinder

The cylinder consists of an aluminum inner cylinder and a certain thickness of alkali-free glass fiber wrapped around the outside of the inner cylinder. The role of the aluminum inner cylinder is to ensure the tightness of the cylinder. The compressive strength of the cylinder is determined by the wall of the fiberglass shell, which is completely wrapped around the outside of the cylinder (with epoxy phenolic resin, etc., as a binder). The fiber material of the shell is prone to "aging", so the service life is generally lower than that of the cylinder.

two. Classification according to the physical state of the dielectric

Depending on the physical state of the loading medium, cylinders can be divided into the following three categories.

(1) Permanent gas cylinders

A gas with a critical temperature below -10°c is called a permanent gas, and a cylinder containing a permanent gas is called a permanent gas cylinder. For example, cylinders containing oxygen, nitrogen, air, carbon monoxide and inert gases are of this type. Its common standard pressure range is 15mpa, 20mpa, 30mpa.

(2) Liquefied gas bottle

Gases with a critical temperature equal to or greater than -10°c exist as a gas at room temperature and pressure and are converted to a liquid after pressure and cooling. Some of these gases have a high critical temperature (more than 70°c), such as hydrogen sulfide, ammonia, propane, liquefied petroleum gas, etc., known as critical high temperature liquefied gas, also known as low pressure liquefied gas. The cylinders in which these gases are stored are low pressure LPG cylinders. At room temperature, LPG is always in a state of coexistence of gas phase and liquid phase. Its gas phase pressure is the saturated vapor pressure of the gas at the corresponding temperature. At a maximum operating temperature of 60 ° C, the saturated vapor pressure of all critical high temperature LPG is less than 5mpa, so it can be filled with low pressure cylinders. Its standard pressure range is 1.0mpa, 1.6mpa, 2.0mpa, 3.0mpa, 5.0mpa.

(3) Dissolve the gas cylinder

This type of cylinder is a cylinder specifically designed to hold acetylene. Acetylene gas is volatile, especially under high pressure, easy to aggregate or decompose, after the dissolution of acetylene slightly vibration caused by explosion, so in the compressed gas dissolved acetylene (acetone solvent), and in porous materials (such as calcium silicate porous materials) as absorbent. The maximum working pressure of gas cylinders is usually not more than 3.0 technology, and its safety problems are characterized, such as acetone is sent acetylene in the cylinder, resulting in cylinder acetylene with static electricity, resulting in combustion, explosive consumption, increased acetone and other safety hazards.