ISO INTERNATIONAL STANDARD 10790 Third edition 2015-04-01 Measurement of fluid flow in closed conduits Guidance to the selection, installation and use of Coriolis flowmeters (mass flow, density and volume flow measurements) Mesure de debit des fluides dans les conduites fermees-Lignes directrices pourla selection,I'installationet I'utilisation des mesureurs a effet Coriolis (mesurages de debit-masse, masse volumiqueetdébit-volume) Reference number ISO 10790:2015(E) LSO Intermational Organization for Standardization @IS02015 dization5956617 ithout license from IHS IS010790:2015(E) COPYRIGHTPROTECTEDDOCUMENT @IS0 2015 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211 Geneva 20 Tel. + 4122 749 01 11 Fax +41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland PrganizationforStandardization No reproduction or networking permited without license from IHS Not for Resale, 2015/6/29 08:37:4 IS010790:2015(E) Contents Page Foreword ..V Introduction.. ...vi 1 Scope. 2 Normative references 3 Terms and definitions. 3.1 Definitions specificto this Coriolisflowmeter standard .1 3.2 Definitions fromVIM,IS0/IECGuide99 (JCGM:2012) 3.3 Symbols 4 3.4 Abbrevations .5 Coriolis flowmeter selection criteria ..5 4 4.1 General .5 4.2 Physical installation. .5 4.2.1 General. .5 4.2.2 Installation criteria .6 4.2.3 Full-pipe requirementfor liquids .6 4.2.4 Orientation. .6 4.2.5 Flow conditions and straight length requirements .6 4.2.6 Valves. .6 4.2.7 Cleaning 4.2.8 Hydraulic and mechanical vibrations 7 4.2.9 Pipe stress and torsion .7 4.2.10 Crosstalk between sensors .7 4.3 Effectsduetoprocessconditionsandfluidproperties .7 4.3.1 General. .7 4.3.2 Application and fluid properties .7 4.3.3 Multiphaseflow .8 4.3.4 Influence ofprocessfluid .8 4.3.5 Temperature effects.. 4.3.6 Pressure effects. 9 4.3.7 Pulsating flow effects .9 4.3.8 Viscosity effects. 9 4.3.9 Flashing and/or cavitation .9 4.4 Pressure loss. .9 4.5 Safety .9 4.5.1 General. .9 4.5.2 Hydrostaticpressuretest 9 4.5.3 Mechanical stress. .10 4.5.4 Erosion. ..10 4.5.5 Corrosion ..10 4.5.6 Housing design ..10 4.5.7 Cleaning ..10 4.6 Transmitter (secondary device) .10 4.7 Diagnostics .11 5 Inspectionand compliance .11 6 Mass flow measurement. .12 6.1 Apparatus .12 6.1.1 Principle ofoperation ..12 6.1.2 Coriolis sensor ..14 6.1.3 Coriolis transmitter ..15 6.2 Mass flow measurement. .15 6.3 Factors affecting mass flow measurement. ..17 6.3.1 Density and viscosity ..17 ntemainal oganzation @s1S.2015 - All rights reserved iii icensee=Zhejiang Institute of Standardization 5956617 thout license from IHS