ISO INTERNATIONAL STANDARD 8222 Third edition 2020-03 Petroleum measurement systems Calibration Volumetric measures, proving tanks and field measures (including formulae for properties of liquids and materials) Reference number ISO 8222:2020(E) ISO @IS02020 IS0 8222:2020(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may 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 2020 - All rights reserved IS0 8222:2020(E) Contents Page Foreword .. Introduction ...vi 1 Scope. 2 Normative references 3 Terms, definitions, symbols and units ..1 3.1 Terms and definitions.. ..1 3.2 Symbols and unit.... 4 Traceability .9 5 General design characteristics of volumetric measures .10 5.1 General design .10 5.2 Design to indicate the volume - Resolution ..12 5.2.1 Neck size ..12 5.2.2 Gauge glass. .12 5.2.3 Scales .13 5.2.4 Adjustment of scale and calibrated volume .15 5.2.5 Levelling. .15 5.3 Additional design aspects ..15 5.3.1 Temperature measurement .15 5.3.2 Valves and connections .16 5.3.3 Size of measures. ..17 5.4 Filling and drainage .18 5.4.1 Drainage times and fluids .18 5.4.2 Filling and drainage methods .19 5.5 Markings. 20 6 Test measures. .21 6.1 Overview .21 6.2 Design and construction of test measures .23 7 Proving tanks. .24 7.1 Overview .24 7.2 General construction .28 7.3 Bottom neck .28 7.4 Strength .29 7.5 Support. 29 7.6 Size 29 7.7 Mobility 29 7.8 Overflow and vapour recovery .29 7.9 Filling and drainage. .29 8 Alternative designs ..30 8.1 High-accuracy designs. .30 8.2 Automatic pipettes. .30 8.3 Proving tanks with bottom sight gauge. .30 9 Calibration .31 9.1 General .31 9.2 Common calibration procedures .31 9.3 Gravimetric calibration. .33 9.3.1 Principle. .33 9.3.2 Calibration circuit and equipment .33 9.3.3 Procedure for calibrating a measure gravimetrically .34 9.4 Volumetric calibration. .34 9.4.1 Principle .34 9.4.2 Calibration circuit and equipment. .35 @ IS0 2020 - All rights reserved iii IS0 8222:2020(E) 9.4.3 Procedure for calibrating a measure volumetrically (water pour) 36 9.4.4 Procedure for calibrating a measure volumetrically (water withdraw) 36 9.4.5 Additional notes on procedures. 37 9.5 Calibration by reference meter.. .38 9.5.1 Principle .38 9.5.2 Calibration circuit 38 9.5.3 Equipment 39 9.5.4 Procedure for calibration by reference meter 40 9.6 Calibration of neck scales 40 10 Calculations 41 10.1 Overview 41 10.2 Reference volume 41 10.3 Transferred volume (volumetric method) 42 10.4 Transferred volume (gravimetric method) 43 10.5 Calibrated volume of test device.. 44 10.6 Multiple fills 45 10.7 Calibration of a measure using a reference measu 45 10.8 Calibration of a flowmeter using a measure as reference. 46 10.9 Calibration of a displacement (pipe) prover using a measure as reference .46 11 Calibrating and setting the neck and scale 46 11.1 Calibrating the neck 46 11.2 Setting the scales. 47 12 Safety 48 Annex A (informative) Properties of fluids and materials 49 Annex B (informative) Temperature measurement and thermometers. .63 AnnexC(informative)Standardglasscontentsmeasures 65 Annex D (informative) Meniscus reading .66 Annex E (informative) Accuracy and uncertainty of volumetric measures .67 Bibliography 68 iv @ IS0 2020 - All rights reserved IS0 8222:2020(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (sO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations,