In commercial medium-sized vessels (weighed below 230,000 DWT), "Heating Coil" of about 45mm-OD-tube units are generally installed over the entire inner bottom surface of their cargo hold, totally in tens-of-kilometer length. The heating facilitates the loading and off-loading processes of the cargo having high viscosity such as crude oil by increasing fluidity. The selection of the material for heating coil tube usually depends upon what cargo to be carried in the vessels. Stainless steel 316L and aluminum brass tube materials have been generally used, respectively, for product carriers (PCs) and cargo oil tankers (COTs). In this study, the critical corrosion issues in the heating coil units of stainless steel and aluminum brass tube materials were reviewed through the actual case studies. The history and cause of corrosion damage, ship yard practice of its manufacturing and anti-corrosion measures regarding heating coil units are addressed in detail.

Subject
Grain size, Coils, Steel surfaces, Materials, Contamination, Aluminum, Tubes, Welding, Marine vessels, Case studies, Stainless steel, Brass, Stress corrosion cracking
Keywords:
heating coil, stainless steel 316L (UNS S31603), aluminum brass (JIS C6870T), stress corrosion cracking, surface contamination, anti-corrosion measure, cargo hold, product carrier, cargo oil tanker
© 2004 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
Association for Materials Protection and Performance (AMPP)
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