BS EN 1089-3:2011 pdf download – Transportable gas cylinders — Gas cylinder identification (excluding LPG) Part 3: Colour coding The property shall be classified in a descending order of hazard as follows: 6.2.2.2 For gases with a single danger: a) toxic and/or corrosive (in accordance with ISO 10298 and ISO 13338) — yellow; b) flammable (in accordance with EN ISO 10156) — red; c) oxidizing (in accordance with EN ISO 10156) — light blue; d) inert 1) — bright green. The colour BRIGHT GREEN shall not be used for air for medical use or breathing application (see 6.2.5). 6.2.2.3 For gases with more than one danger: When a gas or mixture has two hazard properties, then the cylinder shoulder shall be coloured in accordance with the primary hazard. The colour of the secondary hazard (flammable or oxidizing) may also be applied to the cylinder shoulder: a) toxic (and/or corrosive) and flammable — yellow plus red; b) toxic (and/or corrosive) and oxidizing — yellow plus light blue. 6.2.3 Specific single gases 6.2.3.1 The following gases shall be identified by specific colours rather than the colour system defined in 6.2.2. a) Flammable gases: Acetylene — Maroon. b) Oxidizing gases: Oxygen — White; Nitrous oxide — Blue. 6.2.3.2 Inert gases for medical application shall be further differentiated by use of the following colours: a) Argon — Dark green; b) Nitrogen — Black; c) Carbon dioxide — Grey; d) Helium — Brown. Specific colours of single gases described above are identical to ISO 32. These colours may also be used for applications other than medical instead of the bright green colour (inert) as indicated in 6.2.2. NOTE Inert gases for medical use are also differentiated from industrial use by the colouration of the gas cylinder body, white for medical use (see 6.3). 6.2.4 Mixtures of inert gases Instead of the hazard colour as indicated in 6.2.2, combinations of colours (maximum two, see Annex D) of the specific component gases listed in 6.2.3.2 may be used to identify the cylinder contents. 6.2.5 Oxygen mixtures and air for medical use and breathing application For medical use, the following gas mixtures containing at least 20 % oxygen shall be identified using the colour of the components listed in 6.2.3. These colours may also be used for breathing applications other than medical. a) Air or synthetic air — white plus black; b) Oxygen/helium — white plus brown; c)...
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