This standard specifies the classification and FTSC code of commonly used compressed gases. This standard applies to permanent gases, liquefied gases and dissolved gases filled in gas cylinders. This standard does not apply to firefighting gases and adsorbed gases. GB 16163-1996 Classification of Bottled Compressed Gases GB16163-1996 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Classification of cylinder compressed gases
Classification of cylinder compressed gases1 Subject content and scope of application
This standard specifies the classification and FTSC code of commonly used compressed gases. GB16163—1996
This standard applies to permanent gases, liquefied gases and dissolved gases filled in gas cylinders. This classification and FTSC code reflect the comprehensive safety performance of cylinder compressed gases, help to identify the commonality and individuality of gases and prevent confusion. It aims to strengthen the safety design and safety prediction of gas cylinders and gas cylinder accessories, implement safety management in gas filling and use, and guide the orderly expansion of compressed gases. This classification is the basis for the preparation of mixed gases.
This standard does not apply to fire fighting gases and adsorbed gases. 2. Terminology
2.1 Cylinder compressed gases
General term for permanent gases, liquefied gases and dissolved gases filled in gas cylinders. 2.2 Permanent gases
Gases with a critical temperature of less than -10°C.
2.3 Liquefied gas
Gases with a critical temperature greater than or equal to -10°C are a general term for high-pressure liquefied gases and low-pressure liquefied gases. 2.3.1 High-pressure liquefied gas
Gases with a critical temperature greater than or equal to -10°C and less than or equal to 70°C. 2.3.2 Low-pressure liquefied gas
Gases with a critical temperature greater than 70°C.
2.4 Dissolved gas
Gases dissolved in a solvent in a gas cylinder under pressure. 3 Classification principles
Classify according to the physical state and critical temperature of compressed gases in gas cylinders, and group them according to their chemical properties, flammability, toxicity, and corrosiveness; mark the basic characteristics of each gas according to the FTSC code, and use this as the basis for classification to form a systematic comprehensive classification. 3.1 Class 1 permanent gas
Group a non-flammable and non-toxic and non-flammable toxic gases;
Group b, flammable and non-toxic and flammable toxic gases. This type of gas is in gaseous state when filled and during storage, transportation and use at the allowable working temperature. 3.2 Class 2 liquefied gas
3.2.1 High-pressure liquefied gas
Approved by the State Bureau of Technical Supervision on January 25, 1996 132
Implementation on October 1, 1996
Group a non-flammable and non-toxic and non-flammable toxic gases;
Group b flammable and non-toxic and self-igniting toxic gases,
Group c, flammable gases that are easily decomposed or polymerized. GB 16163--1996
This type of gas is in liquid state when filled, but during storage, transportation and use at the allowable working temperature, as the temperature rises, it evaporates into gaseous state when it exceeds the critical temperature.
3.2.2 Low-pressure liquefied gases
Group a: non-flammable and non-toxic, non-flammable toxic, acidic and corrosive gases; Group b: flammable and non-toxic, flammable and toxic, alkaline and corrosive gases; Group c: combustible gases that are easily decomposed or polymerized. bZxz.net
These gases are in liquid form when filled and during storage, transportation and use at the allowable working temperature. 3.3 Class 3 dissolved gases
Group a: combustible gases that are easily decomposed or polymerized.
3.4 ​​FTSC digital code
The FTSC code of a gas is derived from the abbreviation of the English words for flammability, toxicity, state and corrosiveness. The FTSC code consists of four digits in sequence, which directly indicate the basic characteristics of each gas. 3.4.1 Basis of coding
The coding is based on the following four basic characteristics:
Flammability
According to the potential danger of combustion, it is divided into six types: non-flammable, combustion-supporting (oxidizing), flammable, spontaneous combustion, strong oxidizing, decomposition or polymerization.
According to the route of contact toxicity and the degree of toxicity, it is divided into three levels: non-toxic, toxic, and highly toxic according to the acute moss (single exposure) inhalation median lethal dose concentration LC5o.
State--According to the state of the gas filled in the bottle and the pressure in the bottle at 20℃, it is divided into seven types. Corrosiveness
-According to the different corrosiveness of the gas, it is divided into four types: non-corrosive, acidic corrosion (hydrogen halogen acid corrosion and non-hydrogen halogen acid corrosion), and alkaline corrosion.
3.4.2 Meaning of coding
The meaning of coding is shown in Table 1 and Appendix A (Supplement). Table 1 FTSC digital code
F Flammability (first digit)
Non-flammable (inert)
Combustible (oxidizing)
Flammable: Gas with lower explosion limit less than 10% (in air) Autoignition: The autoignition temperature of flammable gas in air is less than 100℃ Strong oxidizing
Easy to decompose or polymerize and is flammable
Toxic (second digit) Inhalation median lethal concentration LCso/1hT
Non-toxic LCs>5000 ppm (V/V)
Toxic 200 ppm (V/V)
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