ISO INTERNATIONAL STANDARD 16812 Third edition 2019-02 Petroleum, petrochemical and natural gas industries - Shell-and-tube heat exchangers Industries du pétrole, de la pétrochimie et du gaz naturel - Echangeurs de chaleur a faisceaux Reference number ISO 16812:2019(E) so @ IS0 2019 IS0 16812:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 16812:2019(E) Contents Page Foreword ..iv Introduction. ...vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Supplements to API Std 660, 9th edition (2015) .2 4.1 General requirements .2 4.2 Service designation.. .2 4.3 Requirements for carbon steel in sour or wet hydrogen sulfide service .2 4.4 Weld procedure qualification. .2 4.5 Sour or wet hydrogen sulfide service. 2 4.5.1 Subclause A.2.2.1 .2 4.5.2 Subclauses A.2.2.2 and A.2.2.3 .2 4.6 Tube failure in high-pressure units .2 Bibliography 3 @ IS0 2019 - All rights reserved iii