ISO/TC 58/SC 2/WG 7 - Determination of properties of gases and gas mixtures

This document specifies the following, in order to determine the corrosiveness of gases and gas mixtures so that a suitable outlet connection can be assigned to each of them: — for pure gases and some liquids, a complete list indicating their corrosiveness; — for gas mixtures, a calculation method, in the absence of experimental data, relating to the corrosiveness of each of their components.

ISO 10298:2018 lists the best available acute-toxicity data of gases taken from a search of the current literature to allow the classification of gases and gas mixtures for toxicity by inhalation.

ISO 10156:2017 specifies methods for determining whether or not a gas or gas mixture is flammable in air and whether a gas or gas mixture is more or less oxidizing than air under atmospheric conditions. ISO 10156:2017 is intended to be used for the classification of gases and gas mixtures including the selection of gas cylinder valve outlets. ISO 10156:2017 does not cover the safe preparation of these mixtures under pressure and at temperatures other than ambient.

ISO 14456:2015 gives a list of FTSC (fire potential, i.e. "oxidizing potential and flammability", toxicity, state of the gas, and corrosiveness) codes determined according to the relevant properties of gases and of some liquids that are transported under pressure.

ISO 13338:2017 provides: - for pure gases and some liquids, a complete list indicating their corrosiveness; - for gas mixtures, a calculation method, in the absence of experimental data, relating to the corrosiveness of each of their components; in order to determine the corrosiveness of gases and gas mixtures on tissue so that a suitable outlet connection can be assigned to each of them.

ISO 10298:2010 lists the best available acute-toxicity data of gases from the literature to allow the classification of gases and gas mixtures.

ISO 10156:2010 specifies methods for determining whether or not a gas or gas mixture is flammable in air and whether a gas or gas mixture is more or less oxidizing than air under atmospheric conditions. It is intended to be used for the classification of gases and gas mixtures including the selection of gas cylinder valve outlets. It does not cover the safe preparation of these mixtures under pressure and at temperatures other than ambient.

ISO 10156-2:2005 specifies a test and a calculation method to be used for determining whether or not a gas (or a gas mixture) is more oxidizing than air. It applies only to toxic and corrosive gases and gas mixtures.

Specifies two methods for determining whether or not a gas is flammable in air and whether a gas is more or less oxidizing than air. Replaces the first edition.

Describes a test method for the determination of the toxicity of a gas or gas mixture in order to eliminate difficulties involved in the application of ISO 5145. A calculation method enables the toxicity of gas mixtures to be determined in the absence of valid experimental data.

Gives a complete list of the corrosiveness for pure gases and a calculation method relating to the corrosiveness of gas mixtures which is applicable in the absence of experimental data to each of their components.

Establishes practical criteria for determining valve outlet connections for gas cylinders of a capacity not greater than 150 l. Applies particullary to countries having neither standards nor regulations and to new gases developed for industrial use. I does not apply to connections used for cryogenic gas groups; annex B deals with connections; double-faucet non-interchangeable connections are given in annex C. The biblio-graphie is given in annex D.