(ISO)2 NTERNATIONAL STANDARD 2975/1 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKIYHAPOTHAS OPTAHH3ALNH TIO CTAHIAPTH3AIIW·ORGANISATION INTERNATIONALE DE NORMALISATION Measurement of water flow in closed conduits - Tracer methods --- Part Il : Constant rate injection method using non-radioactive tracers Mesure de debit de I'eau dans les conduites fermées - Methodes par traceurs Partie Il : Methode d'injection a debit constant, utilisant des traceurs non radio-actifs First edition - 1975-08-15 TS0 2975/1-1975 (E) UDC 681.121.84 Ref. No. ISO 2975/ll-1975 (E) Descriptors : flow measurement, pipe flow, water flow, tracer method, non-radioactive tracers, testing conditions, colorimetric analysis, fluorimetric analysis, conductimetric analysis, error analysis. Price based on 9 pages Not for Resale FOREWORD Iso (the International Organization for Standardization) is a worldwide federation 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 2975/ll was drawn up by Technical Committee ISO/TC 30, Measurement of fluid flow in closed conduits, and circulated to the Member Bodies in May 1974. It has been approved by the Member Bodies of the following countries : Australia Ireland Thailand Belgium Mexico Turkey Bulgaria Netherlands United Kingdom Romania Czechoslovakia U.S.A. France Spain U.S.S.R. Germany Switzerland Yugoslavia No Member Body expressed disapproval of the document. @ International Organization for Standardization, 1975 Printed in Switzerland ted without license from IHS Not for Resale ISO 2975/l1-1975 (E) INTERNATIONAL STANDARD Measurement of water flow in closed conduits - Tracer methods -- Part II : Constant rate injection method using non-radioactive tracers 0 INTRODUCTION where Co is the initial concentration in the stream which is flowing at the rate Q. This International Standard is the second of a series of standards covering tracer methodsof waterflow Hence : measurement in closed conduits. The complete series of (C, - C2) standards will be as follows : Q= C2 - Co -- Part I : General. Generally C, is much greater than C2 which leads to a Part ll: Constant rate injection method using simplification of equation (1) as follows : non-radioactive tracers. C1 Part lll: Constant rate injection method using radioactive tracers. Part /V: Integration (sudden injection) method When C2 is much greater than Co, the equation can be using non-radioactive tracers. reduced still further to Part V : Integration (sudden injection) method using Q： radioactive tracers. Part VI : Transit time method using non-radioactive Flow rate Q can thus be determined by comparing the tracers. concentration of the injected solution with the Part Vll : Transit time method using radioactive concentration of samples removed from the conduit. tracers. In order to increase the accuracy it is recommended that the standard solution be prepared to a given dilution ratio Nst which shall be approximately equivalent to the dilution ratio N which is expected in the sample taken from the measuring cross-section. 1 SCOPE AND FIELD OF APPLICATION The standard solutions and the samples taken from the This International Standard specifies the constant rate measuring cross-section shall be compared using identical injection method using non-radioactive tracers for the methods, and the following formula is applicable : measurement of water flow rate in closed conduits. N m= Nst The flow rate to be determine