scope:

This standard specifies requirements for single or two-stage pressure regulators with flow metering devices for connection to gas cylinders used for:
. compressed gases up to 300 bar1) (30.000 kPa);
. dissolved acetylene;
. liquefied petroleum gases (LPG);
. methylacetylene-propadiene-mixtures (MPS);
. carbon dioxide (CO2).
for use in welding, cutting and allied processes. It does not cover pressure regulators with flow metering devices having a nominal outlet pressure p2 > 20 bar.
This standard also specifies requirements for pressure regulators with flow metering devices for connection to gas cylinders used for:
. compressed gases or mixtures up to 300 bar (30.000 kPa);
. 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 wire welding and plasma cutting. Annex B gives examples of flow control systems and their flow measuring devices.
This standard does not cover pressure regulators intended for direct use on cylinder bundles. Such regulators should comply with the safety requirements of ISO 7291, in particular with the adiabatic compression test for oxygen regulators.
NOTE In addition to terms in English and French (two of the three official ISO languages), this International Standard gives the equivalent terms in German; these are published under the responsibility of the member body for Germany (DIN). However, only the terms and definitions given in the official languages can be considered as ISO terms and definitions.