This International Standard specifies requirements and test methods for pressure regulators in manifold systems used in welding, cutting, and allied processes for: a) compressed gases up to 30 MPa1) (300 bar); b) dissolved acetylene; c) liquefied petroleum gases (LPG); d) methylacetylene-propadiene-mixtures (MPS); e) carbon dioxide (CO2). It is not applicable to pressure regulators fitted directly to the gas cylinders, as defined in ISO 2503[2].