The method for assessing internal corrosion in normally dry gas systems, DG-ICDA, relies upon the ability to identify the locations along the pipeline most likely to accumulate electrolyte. This requires calculating critical angles for liquid accumulation at different pipeline operating conditions. The critical angle correlation developed during the original DG-ICDA work was based on multiphase flow modeling data covering operating conditions typical of Gas Transmission Pipelines. The present work extended the flow modeling data to conditions typical of local distribution companies. An improved critical angle equation was developed. This new equation does not require iterations to calculate critical angles and is applicable to the full range of conditions typical of both gas transmission and local distribution pipelines.

Subject
Gas transmission, Pipeline operations, Water, Piping, Correlation, Modeling, Pipelines, Gas pressure, Deviation, Gas velocity, Liquids, Multiphase flow, Internal corrosion direct assessment
Keywords:
Dry Gas Internal Corrosion Direct Assessment, DG-ICDA, critical angle
© 2006 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).
2006
Association for Materials Protection and Performance (AMPP)
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