ISO INTERNATIONAL STANDARD 3675 Third edition 1998-06-15 Crude petroleum and liquid petroleum products Laboratory determination of density Hydrometer method Pétrole brut et produits petroliers liquides Détermination en laboratoire delamassevolumiqueMethodeaIaréometre ISO Referencenumber ISO3675:1998(E) T by IHS under lic Not for Resale ISO 3675:1998(E) Foreword ISO (the International Organization for Standardization) is a worldwide preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which atechnicalcommitteehasbeenestablishedhastherighttoberepresented on that committee. International organizations, governmental and non- governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 3675 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants, subcommittee SC 3, Static petroleummeasurement. This third edition cancels and replaces the second edition (iSO 3675:1993), of which it constitutes a Technical revision. Annex A forms an integral part of this International Standard. Annex B is for informationonly @ISO1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. InternationalOrganizationforStandardization Case postale 56·CH-1211Geneve 20·Switzerland Internet [email protected] Printed in Switzerland tlicense from IHS Not for Resale ISO 3675:1998(E) INTERNATIONAL STANDARD @ISO Crude petroleum and liquid petroleum products - Laboratory determination of density Hydrometer method WARNING - The use of this International Standard may involve hazardous materials, operations and equipment. This International Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies a method for the laboratory determination, using a glass hydrometer, of the density at 15 °C of crude petroleum, liquid petroleum products, and mixtures of petroleum and non- petroleum products normally handled as liquids and having a Reid vapour pressure (RvP) of 1oo kPa or less. This International Standard is suitable for determining the density of mobile transparent liquids. It can also be used for viscous liquids by carrying out the determinations at temperatures above ambient using a suitable liquid bath for temperature control. It can also be used for opaque liquids by reading the hydrometer scale where the top of the meniscus meets the stem of the hydrometer and applying a correction from table 1 (see 11.2). Since hydrometers are calibrated to read correctly at the specified temperature, scale readings made at other temperatures are only hydrometer readings and not values of density at these other temperatures. NOTES The accuracy of the density, determined by the procedures given in this International Standard, for volatile and/or waxy crude oils containing free and/or suspended water and sediments can be less than inferred from the precision data quoted necessary to ensure that the test portion transferred to the hydrometer cylinder is as representative as possible of the bulk sample. Techniques are given in clause 7 which are designed to minimize such loss of light component. 2 Values of density at 15 C can be converted using standard measurement tables to equivalent values of APl gravity or relative density so