Beginning about 1954–or perhaps a bit earlier–a number of attempts were being made to reduce the degree of subjectivity involved in the ultrasonic measurement of wall thicknesses in process equipment and in the marine industry. Wall thickness readings to an accuracy of ±0.010-in, ±0.020-in or thereabouts were obtainable by the ‘Multiple Back Echo” method, using pulse-echo equipment, but such techniques depended greatly on alertness of the operator and were not generally suitable for pipe sizes less than 2 1/2-in Schedule 80 or wall thicknesses less than about 1/4 or 3/8-in.
Subject
Pits,
Cathodes,
Materials,
Probes,
Tubes,
Thickness measurement,
Tools,
Transducers,
Instrumentation,
Wall thickness,
Erosion,
Equipment,
Scale
© 1970 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).
1970
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.
