ISO INTERNATIONAL STANDARD 11541 First edition 1997-02-15 Natural gas - Determination of water content at high pressure Gaz naturel Dosage de I'eau a haute pression ISO Reference number ISO11541:1997(E) No reproduction or networking permitted without license from IHS Not for Resale ISO 11541:1997(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 a technical committee has been established has the right to be rep- resented 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 11541 was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis of natural gas. ? ISO 1997 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. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 . Switzerland Internet [email protected] X.400 c=ch; a=400net; p=iso; 0=isocs; s=central Printed in Switzerland ! tionalOrganizationforStandardization No reproduction or networking permitted without license from IHS Not fr Resale ISO 11541:1997(E) INTERNATIONALSTANDARD @ISO Natural gas -- Determination of water content at high pressure 1 Scope Water vapour may be present in natural gas due to, for example, natural occurrence in the well production stream. the storage of gas in underground reservoirs, transmission or distribution through mains containing moisture or otherreasons. more than 1 MPa, the upper pressure limit being determined by the maximum pressure that the apparatus can withstand. It is applicable to sweet natural gas and sour natural gas, containing hydrogen sulfide, with a water concentration of 10 mg/m3 or more.1) Test data may be affected by alcohols, mercaptans, hydrogen sulfide and glycol contained in the sample gas, as 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISo maintain registers of currently valid International Standards. IsO 10715:—_2), Natural gas — Sampling guidelines. 3Principle contained in the gas is absorbed by the phosphorus pentoxide and phosphoric acid is formed. The increase in the pressure is favoured over absorption at ambient pressure for the following reasons: a) the watervapour partial pressure is high; b) the necessary amount of gas is transmitted in a shorter time. 1 In this International Standard, all volumes are expressed at 288,15 K and 101,325 kPa. 2) To be published. No reproduction or networking permitted without Not for Resale