INTERNATIONAL STANDARD (ISO) 2435 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKIYHAPOAHA OPIAHH3ALIHH IIO CTAHIAPTI3AIIHN·ORGANISATION INTERNATIONALE DE NORMALISATION Nitrogen for use in aircraft First edition - 1973-12-01 UDC 629.13 : 621.602 SO 2435-1973 (E) Ref. No. ISO 2435-1973 (E) Descriptors : aircraft, nitrogen, materials specifications, pressure. Price based on 1 page Copyright International Organization for Standardization ermitted without license from IHS Not for Resale 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 the Member Bodies for approval before their acceptance as International to Standards by the ISO Councit. Committee ISO/TC 20, Aircraft and space vehicles, and circulated to the Member Bodies in June 1971. It has been approved by the Member Bodies of the following countries : Austria India South Africa, Rep. of Belgium Italy Spain Brazil Japan Thailand Canada Turkey Netherlands New Zealand United Kingdom Czechoslovakia Romania Egypt, Arab Rep. of U.S.S.R. The Member Bodies of the f following countries s expressed disapproval of the document on technical grounds : France U.S.A. @ International Organization for Standardization, 1973 Printed in Switzerland ariza itted without license from IHS Not for Resale ISO 2435-1973 (E) INTERNATIONAL STANDARD Nitrogen for use in aircraft 1 SCOPE AND FIELD OF APPLICATION 3 CHARACTERISTICS This International Standard specifies the pressure and 3.1 The minimum purity of the nitrogen shall be 98,5 % characteristics of nitrogen, compressed in oil-lubricated by volume. equipment, for use in aircraft. This International Standard is not intended to cover nitrogen for use in oxygen systems. 3.2 The nitrogen shali contain not more than a total of 0,005 mg of oil vapour and particulate matter per cubic decimetre (or litre) of nitrogen at 15 °c and 1 013 mbar 2 PRESSURE (14.69 Ibf/in2) of aircarft systems up to 343 bar (4 975 Ibf/in2) at 20°c. 3.3 The water content shall not exceed 0,02 mg per cubic decimetre (or litre) of nitrogen at 15 °C and 1 013 mbar NOTE -- The working pressures of aircraft nitrogen systems currently in use are (14.69 lbf/in2). 1) 207 bar (3 000 Ibf/in2); 2) 276 bar (4 000 Ibf/in2);: 3.4 Any particulate matter in the gas shall be capable of 3) 343 bar (4 975 Ibf/in2) passing through a filter with a nominal rating of 10 μm. N0TE-- 1bar = 100 kN/m2= 100 kPa 1 Copyright International Organization for Standardization Not for Resale