485190300542881 7278 PT 1-87 H-26-30 ISO 7278-1 INTERNATIONAL STANDARD First edition 1987-03-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXKAYHAPOAHAH OPrAHM3ALMR O CTAHAAPTM3AUMM Liquid hydrocarbons -- Dynamic measurement Proving systems for volumetric meters Part 1: General principles Hydrocarbures liquides -- Mesurage dynamique - Systemes d'etalonnage des compteurs volumetriques - Partie 1: Principes generaux Referencenumbe ISO 7278-1 : 1987 (E) E 692h500 8 7278 PT 1-87 EO6TSh Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through iSO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental 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. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard iSO 7278-1 was prepared by Technical Committee ISO/TC 28, Petroleumproducts and lubricants. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other international Standard implies its latest edition, unless otherwise stated. @ international Organization for Standardization, 1987 Printed in Switzerland n or networking permitted without license from IHS Not for Resale No reproductio 062S00 E06T5%h 7278 PT 1-87 2 INTERNATIONAL STANDARD ISO 7278-1 : 1987 (E) Liguid hydrocarbons - Dynamic measurement Proving systems for volumetric meters Part 1: General principles 0 Introduction for all liquids and flow rates, provided that the master meter is proved against acceptable proving systems under condi- This document is the first part of an International Standard on tions which simulate those under which it will operate. proving systems for meters used in dynamic measurement of Sometimes, a meter is used as a means of standardization liquid hydrocarbons. Future parts of ISo 7278 will provide more of transfer; this equipment is generally known as a "master detailed descriptions of pipe provers, tank provers and pulse meter". interpolation techniques; these parts are in preparation. Parts 3.2 Provers can be used either connected (fixed or mobile)to added as the need arises. the metering station or in a central proving station to which the meters or the measures can be taken to be proved. The purpose of proving a meter is to determine its relative error or its meter factor as a function of flow rate and other 3.3 In order to limit the maximum uncertainty to ± 0,01 % parameters such as temperature, pressure and viscosity. when using a pulse generator for proving, at least 10 000 pulses shall be obtained from the meter per proving run. The purpose of determining the relative error is to find out This number of pulses can be reduced by pulse-interpolation whether the meter is working within prescribed or specially ac- techniques which alow either the use of meters with fewer cepted limits of error, whereas the meter factor is used to cor- rect any error in the indication of a meter by calculation. pulses per unit volume or reduction of the prover volume. 4 General considerations Scope and field of application This part of ISO 7278 provides general principles for proving 4.1 A meter should be proved at the expected operating or systems for meters used in dynamic measurement of liquid prescribed or agreed rates of flow, under the pressure and hydrocarbons. temperature at which it will operate and on the liquid which it will mea