Corrosion damage caused by long-term moth-balling or inactivity of equipment can affect structural integrity. This type of damage in wastewater treatment plants can cause piping components, pressure vessel plates, and structural beams to fail; because of reduced cross sectional areas or perforation.

In a corrosion survey of the Southerly Wastewater Treatment Plant (SWWTP) in Columbus, Ohio, parts of the sludge gas handling system were analyzed for potential rehabilitation. Those items examined included six anaerobic sludge digesters, sludge gas piping and associated valves, and a forty-seven thousand cubic foot methane gas storage sphere.

The importance of this type of survey is obvious. Catastrophic failure or leaks of any components handling explosive gases could cause significant damage by explosion or fire.

The less obvious implication for this type of survey is that such corrosion can be reduced to minimal level, thus, maintaining equipment for future productive use. In the long run, the large capital outlays required for equipment replacement are eliminated.

Subject
Pits, Digesters, Test methods, Water, Piping, Valves, Gas pressure, Floating, Sludge, Roofs, Rehabilitation, Surveys, Visual assessment
© 1989 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).
1989
Association for Materials Protection and Performance (AMPP)
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