ISO INTERNATIONAL STANDARD 2715 Secondedition 2017-11 Liquid hydrocarbons - Volumetric measurement by turbine flowmeter Hydrocarbures liquides - Mesurage volumétrique au moyen de compteurs aturbine Reference number IS02715:2017(E) @ IS0 2017 ut license from IHS Not for Resale, 12/01/2017 00:54:54 MST IS0 2715:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS02017,PublishedinSwitzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +4122 749 09 47 [email protected] www.iso.org @ IS0 2017 - All rights reserved r networking permitted without license from IHS Not for Resale, 12/01/2017 00:54:54 MST IS0 2715:2017(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms and definitions .2 3.2 Symbols and units... Design and operation of turbine flowmeters. .5 4 4.1 Basic characteristics and mode of operation ..5 4.2 Outputsignal 4.3 Pressure loss .8 5 Performance aspects 5.1 General ..8 5.2 Factors affecting meter performance ..8 5.3 General performance characteristics ..8 5.4 Pressure drop and back-pressure considerations. ..10 5.4.1 Pressureloss .10 5.4.2 Flashing and cavitation .11 5.5 Flow profile .12 6 Liquid property effects .12 6.1 General 12 6.2 Effect of viscosity ..12 6.3 Universal viscosity curve ..13 6.4 Effect of temperature. ..16 6.5 Effect of pressure .16 6.6 Lubricity and liquid cleanliness .16 6.7 Two-phase flow ..17 6.8 Two-component operation ..17 6.9 Pulsating and fluctuating flow ..17 7 System design .18 7.1 Design considerations .18 7.2 Selection of turbine meter .19 7.3 Ancillary equipment. 20 7.3.1 General. 20 7.3.2 Mechanical accessories 20 7.3.3 Secondary electronic instrumentation .21 7.4 Flow algorithms. 21 8 Installation aspects. .22 8.1 General 22 8.2 Installation pipework. 22 8.2.1 Effect of bends. 22 8.2.2 Effect of valves. .23 8.2.3 Reducers and expanders 23 8.2.4 Step in the pipe. .23 8.2.5 Minimizing installation effects 23 8.3 Valves. .23 8.4 Flow pulsation. 24 8.5 Electrical installation. .25 8.6 Pulse security 25 Environmental considerations .25 9 9.1 General .25 iii ed without license from IHS Not for Resale, 12/01/2017 00:54:54 MST