Pressure tank corrosion-under-polyurethane insulation and a draft sill-to- tank interface cracking problem on 105A400W tank cars are discussed. The cracking problem existing on all pressure cars built since 1969 that utilize this particular draft sill-to-tank joint and the corrosion-under-insulation has been found on all our cars inspected to date. Approximately 9% of all cars of this design inspected to date have experienced the cracking problem, with our own fleet experiencing 23% cracking.

This paper reviews the corrosion-under-insulation problem and presents the results of field inspections, metallurgical examination, full scale car structural tests and fatigue analysis of the draft sill-to-tank joint design.

Subject
Materials, Insulation, Crack initiation, Inspection, Corrosion cracking, Stress cracking, Stress, Corrosion under insulation, Cracking, Fatigue, Fracture, Cracks, Brittle fracture
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.