ISO INTERNATIONAL STANDARD 9368-1 First edition 1990-12-01 Measurement of liguid flow in closed.conduits by the weighing method - Procedures for checking installations - Part 1: Static weighing systems Mesurededebitdesliquidesdanslesconduitesfermeesparpesée-Controledes installationsdemesure Partie1:Installations statiques Reference number ISO9368-1:1990(E) No reproduction or networking permitted withou se from IHS Not for Resale ISO 9368-1:1990 (E) Contents Page Foreword. ili Introduction iv 1 Scope. 2 Normative references 3 Definitions and symbols. 3.1 Definitions 3.2Symbols 4. Certification. 5 General principles 5.1 Main items of installation . 2 5.2Test liquid 2 5.3. Principle of verification . 5.4 Preliminary operations 2 6 Procedures for checking operations . 2 6.1 Checking the weighing device 2 6.2 Checking the diverter 6.3 Checking the timer 3 6.4 Checking the density measurement system . 3 6.5 Assessment of flowrate stability . 3 6.6 Studyof flowcharacteristics. 4 7 Calculation of the overall uncertainty Annexes Estimationofsystematicandrandomerrors introduced by the weighing device 6 B Study of diverter operation . 9 Assessment of flowrate stability within the integration interval . . 12 Assessment of flowrate stability between integration intervals 14 E Study-of flow characteristics.. 16 Bibliography 7 @ISO1990 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Printed in Switzerland Copyright International Organization for Standardizatior 1SO 9368-1 : 1990 (E Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standardsbodies(lsOmemberbodies).Theworkof preparinglnternational 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. ISo collaborates closelywiththeInternational Electrotechnical Commission(iEC)onall matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 9368-1 was prepared by Technical Committee ISO/TC 30, Measurement of fluid flow in closed conduits. Iso 9368 will consist of the following parts, under the general title Measurement of liquid flow in closed conduits by the weighing method - Procedures for checking installations: Part 1: Static weighing systems Part2:Dynamic weighing systems Annexes A, B, C, D and E form an integral part of this part of Iso 9368. Annex F is for information only. ii permitted without license from IHS Not for Resale