ISO INTERNATIONAL STANDARD 10780 First edition 1994-11-15 Stationary source emissions Measurement of velocity and volume flowrate of gas streams in ducts Emissions de sources fixes -Mesurage de la vitesse et du débit-volume des courants gazeux dans des conduites ISO Reference number ISO10780:1994(E) Copyright Intemational Organization for Standardization ermitted without license from IHS Not for Resale ISO 10780:1994(E) Contents Page 1 Scope 2 Normative references 3 Definitions and symbols 4 Principle 5 Apparatus 2 6 Environmental requirements 8 7 Testprocedure 9 8 Calculation of velocity and volume flowrate 13 9 Accuracy 15 10 Test report 15 Annexes A Maintenance of Pitot tubes 16 B Determination of duct static pressure with Pitot tubes .. 17 C Determinationof flow directionwithPitottubes 18 D Correction of swirling flow 19 @ISO1994 All rights reserved. Unless otherwise specified, 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-1211Geneve20Switzerland Printed in Switzerland Copyright International Organization for Standardization oy IHS un d without license from IHS Not for Resale o ISO ISO10780:1994(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (lsO member bodies).The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for represented on that committee. International organizations, governmental andnon-governmental,inliaisonwithIso,alsotakepartinthework.Iso collaborates closely with the International Electrotechnical Commission (lEC)onallmattersof electrotechnicalstandardization. circulated to the member bodies for voting. Publication as an International a vote. International Standard ISO 10780 was prepared by Technical Committee ISO/TC146, Air quality,Subcommittee SC 1, Stationary source emissions. Annexes A and B form an integral part of this International Standard. An- nexes C and D are for information only. I!! Copyightlintemational Organization for Standardization ed without license from IHS Not for Resale