scope:

This International Standard specifies requirements for single or two-stage pressure regulators without flowmetering devices for connection to gas cylinders used for

- compressed gases up to 300 bar ¹⁾ (30 MPa),

- dissolved acetylene,

- liquefied petroleum gases (LPG),

- methylacetylene-propadiene mixtures (MPS), and

- carbon dioxide (CO₂),

for use in welding, cutting and allied processes. It does not cover pressure regulators having a nominal outlet pressure p₂ > 20 bar.

This International Standard also specifies requirements for single or two-stage pressure regulators with flowmetering devices for connection to gas cylinders used for

- compressed gases or mixtures up to 300 bar (30 MPa), and

- carbon dioxide (CO₂),

for use in welding, cutting and allied processes. Typical processes using this equipment are: tungsten inert-gas arc welding (TIG), metal-arc inert-gas welding (MIG), metal-arc active-gas welding (MAG), plasma arc welding, tubular-cored-wiretubular-cored-wire welding and plasma cutting. Annex B gives examples of flow-control systems and their flow-measuring devices.

This International Standard does not cover pressure regulators intended for direct use on cylinder bundles. Such regulators comply with the safety requirements of ISO 7291, in particular with the adiabatic compression test for oxygen regulators.

NOTE In addition to terms used in English and French, two of the three official ISO languages (English, French and Russian), this document gives the equivalent terms in German; these are published under the responsibility of the member body for Germany (DIN), and are given for information only. Only the terms and definitions given in the official languages can be considered as ISO terms and definitions.

1) 300 bar relates to the maximum cylinder filling pressure at 15 °C.