In this study we subjected high density polyethylene (HDPE) and polyamide-11 (PA-11) to multiple rapid decompressions in a crude oil environment with high pressure methane/carbon dioxide and mixtures of methane, carbon dioxide, and hydrogen sulfide at typical use temperatures, then measured the effect of the decompressions on the mechanical properties of the materials. We observed that the HDPE was severely damaged after the first decompression from 10,000 psi (69 MPa) at 1000 psi (6.9 MPa)/min with methane/CO2 as the pressurization gas. The PA-11 did not suffer any significant loss of mechanical properties after 20 cycles in any of the gas environments.

Subject
Test methods, Materials, Piping, Confidence intervals, Autoclaves, Gas pressure, Mixtures, Polymers, Elongation, High density polyethylene, Blistering, Damage, Oil
© 2000 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).
2000
Association for Materials Protection and Performance (AMPP)
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