INTERNATIONAL ISO STANDARD 3734 ANSI Internat Doc Sec Second edition 1997-08-01 Petroleum products - Determination of water and sediment in residual fuel oils -- Centrifuge method Produits petroliers --- Determination de la teneur en eau et en sédiments dans les fuel-oils résiduels --- Methode par centrifugation ISO Reference number ISO 3734:1997(E) Not for Resale ISO 3734:1997(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO 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, 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 circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 3734 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants, Subcommittee sC 6, Bulk cargo transfer, accountability, inspection and reconciliation. This second edition cancels and replaces the first edition (ISO 3734:1976), which has been technically revised. Annexes A and B form an integral part of this International Standard @ISO1997 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, withoutpermission in writing from the publisher. International Organization for Standardization Case postale 56. CH-1211 Geneve 20 . Switzerland Internet [email protected] X.400 c=ch; a=400net; p=iso; O=isocs; S=central Printed in Switzerland Not for Resale INTERNATIONAL STANDARD @ ISO ISO 3734:1997(E) Petroleum products --- Determination of water and sediment in residual fuel oils -- Centrifuge method WARNING - The use of this International Standard may involve hazardous materials, operations and equipment. This International Standard does not purport to address any of the safety problems associated with its use. It is the responsibility of the user of this International 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 of the sum of water and sediment in residual fuel oils using the centrifuge method. With some oils it is difficult to obtain water or sediment contents using this method. When this situation is encountered, ISO 3733 and ISO 3735 should be used. NOTE --- It has been observed that centrifugal methods of determination of water and sediment may, in many cases, give erroneous results. This is especially so when use of a high-speed mixer has been employed to obtain a representative sample. The method is therefore not entirely satisfactory and the amount of water determined is almost always lower than the actual water content. Significant quantities of water and sediment can cause operational problems in handling equipment and in engines and burners, particularly when the water present contains mineral salts. Design of residual fuel oil treatment facilities, such as filters or centrifuges, is based on a maximum quantity of material to be removed before combustion. Residual fuel oils destined for further refinery processing also require low levels of water and sediment to minimize corrosion problems. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International