BS EN 400:1993 Respiratory protective devices for self-rescue. Self-contained closed-circuit breathing apparatus. Compressed oxygen escape apparatus. Requirements, testing, marking
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This European Standard refers to self-contained closed-circuit breathing apparatus, compressed oxygen type, for escape (in short: compressed oxygen escape apparatus). This standard does not apply to apparatus for work and rescue or for diving devices. It specifies the minimum requirements for compressed oxygen escape apparatus. Laboratory and practical performance tests are included for the assessment of compliance with the requirements.
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 132, Respiratory protective devices; Definitions. EN 134, Respiratory protective devices; Nomenclature of components. EN 136, Respiratory protective devices; Full face masks; Requirements, testing, marking.
For the purposes of this European Standard the definitions given in EN 132 and the nomenclature given in EN 134 apply together with the following. A compressed oxygen escape apparatus is designed and constructed so that exhaled breathing gas is ducted from the facepiece into a circuit which contains a regeneration cartridge and a breathing bag where it is available for rebreathing. The CO2 regeneration cartridge contains chemicals which absorb exhaled carbon dioxide. Oxygen is fed into the circuit at a suitable point by means of a constant flow device or by a lung governed demand valve or by a suitable combination of both. The gas flow may be of the pendulum or loop type and excess gas is ejected via a relief valve.
