ISO INTERNATIONAL STANDARD 17089-1 Secondedition 2019-08 Measurement of fluid flow in closed conduits Ultrasonic meters for gas Part 1: Meters for custody transfer and allocation measurement Mesurage du debit des fluides dans les conduites fermées - Compteurs a ultrasons pour gaz Partie 1: Compteurs pour transactions commerciales et allocations Reference number ISO 17089-1:2019(E) osi @ IS0 2019 IS0 17089-1:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 17089-1:2019(E) Contents Page Foreword ..vi Introduction.. ..vii 1 Scope. 2 Normative references 3 Terms, definitions and symbols. 3.1 Terms and definitions. .1 3.1.1 Quantities... 3.1.2 Meter design .2 3.1.3 Thermodynamic conditions 3.1.4 Statistics .3 3.2 Symbols and subscripts 3.3 Abbrevations. 7 4 Principles of measurement 1 4.1 Basic formulae ..7 4.2 Factors affecting the performance .9 4.3 Description of generic types. .9 4.3.1 General. .9 4.3.2 Transducers .9 4.3.3 Meter body and acoustic path configurations ..10 4.3.4 Average velocity calculation. .12 4.4 Contributions to the uncertainty in measurement ..13 4.5 Reynoldsnumber .13 4.6 USM classification. .13 Meter characteristics ..14 5.1 Operating conditions ..14 5.1.1 Flow rates and gas velocities. ..14 5.1.2 Pressure. ..14 5.1.3 Temperature. .14 5.1.4 Gas quality. ..14 5.2 Meter body, materials, and construction. .15 5.2.1 Materials ..15 5.2.2 Meterbody .15 5.2.3 Connections ..15 5.2.4 Dimensions .15 5.2.5 Ultrasonic transducer ports .16 5.2.6 Pressure tappings ..16 5.2.7 Anti-roll provision .16 5.2.8 Flow conditioner. ..17 5.2.9 Markings .17 5.2.10 Corrosion protection .18 5.3 Transducers. .18 5.3.1 Specification ..18 5.3.2 Rate of pressure change .18 5.3.3 Transducer characterization .18 5.3.4 Path configuration. ..18 5.3.5 Marking. ..18 5.3.6 Cable. ..18 5.3.7 Robustness. .19 5.4 Electronics. ..19 5.4.1 General requirements. .19 5.4.2 Display .. 19 5.4.3 Power supply .19 @ IS0 2019 - All rights reserved iii IS0 17089-1:2019(E) 5.4.4 Signal detection method. 19 5.4.5 Sampling or pulsating flow 19 5.4.6 Signal-to-noise ratio.. 19 5.4.7 Alarm signal 19 5.4.8 Processing of data. 19 5.4.9 Output 20 5.4.10 Cable jackets and insulation 20 5.4.11 Marking. 20 5.5 Software 20 5.5.1 Firmware 20 5.5.2 MODBUS communication data specification 21 5.5.3 Discontinuity 21 5.5.4 Marking and version management. 21 5.5.5 Monitoring and recording of measuring and diagnostic data 21 5.5.6 Correction functions and parameters 21 5.5.7 Inspection and verification functions. 22 5.6 Exchange of components. 22 5.7 Secondary measurements. 22 5.7.1 General 22 5.7.2 Pressure measurement .22 5.7.3 Temperature measurement 22 5.8 Performance requirements .24 5.8.1 General. 24 5.8.2 Accuracy requirements. .24 5.8.3 Influence of pressure, temperature, and gas composition 25 5.9 Operation and installation requirements 26 5.9.1 General 26 5.9.2 Operational requirements 26 5.9.3 Installation requirements 27 5.9.4 Manual handling and transportation .30 5.10 Documentation 30 5.10.1 General. 30 5.10.2 Generic meter documentation 30 5.10.3 Particular meter documentation .31 6 Test and calibration. 31 6.1 Pressure testing and leakage testing .31 6.2 Individual testing - - Static testing. .31 6.2.1 General. 31 6.2.2 Timing and time delays. 31 6.2.3 Zero flow verification test 31 6.3 Individual test