ISO INTERNATIONAL STANDARD 2714 Secondedition 2017-11 Liquid hydrocarbons Volumetric measurement by displacement meter Hydrocarbures liquides - Mesurage volumétrique au moyen de compteursachambremesureuse Reference number IS0 2714:2017(E) so @ IS0 2017 Not for Resale, 11/29/2017 17:31:17 MST IS0 2714:2017(E) COPYRIGHT PROTECTEDDOCUMENT IS0 2017, Published in Switzerland 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org @ IS0 2017 - All rights reserved Not for Resale, 11/29/2017 17:31:17 MST IS0 2714:2017(E) Contents Page Foreword ..V Introduction.. ..vi 1 Scope. 2 Normative references 3 Terms, definitions, symbols and abbreviated terms. 3.1 Terms and definitions. .1 3.2 Symbols and abbreviated terms. :4 Design and operation of positive displacement meters .5 4.1 Basic characteristics and mode of operation. ..5 4.2 Reciprocating displacement types 4.3 Rotating displacement types.. 7 4.4 Intermeshing screw spindle type. .8 4.5 Oscillating displacement types .9 4.6 Disc type meters .9 5 Performance aspects. .9 5.1 General .9 5.2 Factors affecting meter performance. .9 5.3 General performance characteristics .9 5.4 Pressure drop and back pressure considerations .11 5.5 Flow profile ..11 6 Liquid property effects ..11 6.1 General. ..11 6.2 Effect of viscosity.. ..11 6.3 Effect of temperature. ..13 6.4 Effect of pressure ..13 6.5 Lubricity and liquid cleanliness .14 6.6 Two-phase flow and air elimination ..14 6.7 Two-component operation ..14 6.8 Pulsating and fluctuating flow. ..14 7 System design ..15 7.1 Design considerations. ..15 7.2 Selection of displacement meter type. .16 7.3 Ancillary equipment. ..17 7.3.1 General. .17 7.3.2 Mechanical accessories ..18 7.3.3 Pulse generators and secondary electronic instrumentation ..18 7.4 Flow algorithms. .19 8 Installation aspects. .20 8.1 General .20 8.2 Installation pipework 20 8.3 Flow pulsation. 22 8.4 Electrical installation. 22 8.5 Pulse security. ..23 9 Environmental considerations .23 9.1 General. .23 9.2 Electrical interference 23 9.3 Humidity. .23 9.4 Safety .23 10 Calibration .24 10.1 Proving and verification. 24 yrtnematonaarights reerved iii Not for Resale, 11/29/2017 17:31:17 MST