(ISO) 2046 NTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKIYHAPOIHAI OPTAHH3AIW HO CTAHIAPTH3ALIMH.ORGANISATION INTERNATIONALE DE NORMALISATION Gaseous breathing oxygen supplies for aircraft First edition 1973-12-01 UDC 629.7.048.4 ISO 2046-1973 (E) Ref. No. ISO 2046-1973 (E) Descriptors:aircraft, oxygen, materials specifications,pressure. Price based on 1 page Copyright International Organization for Standardization Not for Resale ted without license from IHS FOREWORD of national standards institutes (ISO Member Bodies). The work of developing International Standards is carried out through ISO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with isO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 2046 was drawn up by Technical Committee ISO/TC 20, Aircraft and space vehicles, and circulated to the Member Bodies in October 1970. It has been approved by the Member Bodies of the following countries : Austria Israel Thailand Belgium Italy Turkey Canada United Kingdom Netherlands New Zealand U.S.S.R. Czechoslovakia Egypt, Arab Rep. of South Africa, Rep. of India Spain The Member Bodies of the following countries expressed disapproval of the document on technical grounds : France Germany U.S.A. International Organization for Standardization, 1973 Printed in Switzerland tedwithout licensefrom IHS Not for Resale ISO 2046-1973 (E) INTERNATIONAL STANDARD Gaseous breathing oxygen supplies for aircraft 1 SCOPE ANDFIELDOF APPLICATION 3.2 Water This international Standard specifies the pressure and The water content of the oxygen shall not exceed 5 mg/m3 characteristics of gaseous breathing oxygen for use in of oxygen when measured at 15 °c and a pressure of aircraft, and is applicable primarily to gas as supplied by the 1 013 mbar (760 mmHg). manufacturer. It is also an acceptable standard which may NOTE - certain aircraft, depending operational For uo be invoked in subsequent stages of distribution. circumstances such as infrequent use of the oxygen system, and environmental temperatures above a certain minimum, a higher when measured from the aircraft cylinder output 2 PRESSURE The gaseous oxygen shall be supplied at sufficient pressure 3.3 Odour to charge aircraft systems to their maximum working The gas shall be odourless as judged by subjective tests. pressure. NOTE -- The maximum working pressures of aircraft oxygen 3.4 Flammability and toxicity to 3 000 lbf/in2).1) The total hydrocarbon content shall not exceed 60 p.p.m. (760 mmHg). The total contamination shall not produce 3 CHARACTERISTICS toxic effects in the user. 3.1 Purity 3.5 Solids The minimum purity of the oxygen shall be 99,5 % by The gas shall contain no particles with any dimensions volume. The remainder shall be as defined in 3.2 to 3.5 larger than 100 μm. The total mass of solids shali not inclusive in respect of flammability, toxicity, odour, exceed 1mg/m3 of gas at 15°c and a pressure of 1 013 mbar (760 mmHg). dryness and particles of solid material. 1) 1 bar = 100 kN/m2 = 100 kPa. Copyright International Organization for Standardization itted without license from IHS Not for Resale