TSO NTERNATIONAL STANDARD 3427 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ·MEKIYHAPOIHAH OPFAHM3ALIM IO CTAHIAPTM3ALIHH·ORGANISATION INTERNATIONALE DE NORMALISATION Gaseous halogenated hydrocarbons (liquefied gases) -- Taking of a sample Hydrocarbures halogenés gazeux (gaz liquéfies) -- Prelevement d'un échantillon First edition - 1976-04-01 APR 5 -- 1976 Isu 3421-19/6 (E) UDC 662.767 : 543.053 Ref. No. ISO 3427-1976 (E) Descriptors : halohydrocarbons, liquefied gases, tests, sampling, test specimen conditioning. Price based on 4 pages Copyright International Organization for Standardization e 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, aliso 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 3427. was drawn up by Technical Committee ISO/TC 47, Chemistry, and circulated to the Member Bodies in February 1974. It has been approved by the Member Bodies of the foliowing countries : Austria Hungary Romania Belgium India South Africa, Rep. of Bulgaria Ireland Spain Israel Switzerland Chile Czechoslovakia Italy Thailand Turkey Egypt, Arab Rep. of Netherlands United Kingdom France New Zealand Germany Portugal U.S.S.R. No Member Body expressed disapproval of the document. @ International Organization, for Standardization, 1976 : Printed in Switzerland Copyright International Organization for Standardization e from IHS Not for Resale ISO 3427-1976 (E) INTERNATIONAL STANDARD Gaseous halogenated hydrocarbons (liquefied gases) -- Taking of a sample 1 SCOPE AND FIELD OF APPLICATION on the quantity of the product required to carry out all of This International Standard specifies the apparatus and the the intended analyses. This quantity shall be small in procedures to be used when taking a laboratory sample of a relation to the total quantity contained in the cylinder in gaseous halogenated hydrocarbon (as a liquefied gas) from a order to avoid any variation in the composition of the container (cylinder, drum, tank, etc.). liquid phase. NOTE - The interior of the sample cylinder shall be examined periodically. If the surface is not clean, wash it with water and an 2 PRINCIPLE appropriate solvent, for example ethanol or acetone. Check its pressure-tightness periodically, for example by immersing Taking of a sample of halogenated hydrocarbon in a it in water and filing it with nitrogen to a pressure of about stainless steel cylinder, previously cleaned, dried and 3 MPa*. evacuated. The sample cylinder is filled to the filling ratio allowed by 3.1.2 Connecting tube, preferably made of stainless steel. safety considerations : relevant details will be given in the of suitable length and having threaded connectors (unions) individual International Standards for the products fitting respectively the valve of the liquefied halogenated concerned. hydrocarbon container and the valive of the sample cylinder (3.1.1). This sample shall be taken only from the liquefied phase. All connectors shall be fitted with washers made of a material which is not attacked by the product to be 3 APPARATUS analysed. 3.2 Electric oven, capable of being controlled at 105 to 3.1 Sampling assembly (see figure 2). 110 °c. 3.1.1 Sample cylinder, constructed of stainless steel, capable of withstanding an internal pressure of at least 3.3 Balance, accurate to ± 1 g. 3 MPa* or as prescribed for a particular product**, and of one of the two types shown in figure 1 : 3.4 Vacuum pump, capable of reducing the pressure in the cylinder (3.1