It is assumed the unit “as delivered” meets design specification within the range of tolerances provided by the design engineer, i.e., unit components have been manufactured, assembled, tested, and installed in such a way that they are in compliance with the original design specification It is assumed the unit “as designed” represents an optimum selection of component sizing and arrangement It is the premise of this book that units “as supplied” will fulfill two basic requirements: The improved understanding of unit condition and rates of deterioration now achieved, together with advances in materials, should allow units to be maintained in a manner that will help minimize maintenance concerns and costs. Similarly, tools are available to assist the operator in analyzing problems and determining the effective corrective action best suited to the condition causing deterioration. More accurate and time-responsive diagnostic tools and techniques are becoming available to assist in predicting when a unit has deteriorated to the extent that corrective action is required. The technology of steam turbines-while mature-continues to evolve. Owners anticipate this, and designers will normally leave an adequate margin, knowing that some level of such deterioration is tolerable. Under such circumstances, these units cannot maintain their original design-specified level of performance indefinitely. These units are required to continually operate in a reliable, safe, and cost-effective manner. Steam turbines represent a complex technology for units commonly designed to operate hundreds of thousands of hours while being subjected to a severe environment and a variety of operating phenomena capable of degrading their condition. The Turbine Steam Path, Damage, Deterioration, and Corrective Options This book has been prepared for those technical people responsible for the operation and maintenance of steam turbines. Turbine Steam Path Maintenance and Repair-Volume Two Printed in the United States of America 1 2 3 4 5 No part of this book may be reproduced, stored in a retrieval system, or transcribed in any form or by any means, electronic or mechanical including photocopying or recording, without the prior written permission of the publisher. q.cm Includes index ISBN 0-87814-788-8 Copyright © 2002 by PennWell Corporation 1421 South Sheridan Road Tulsa, OK 74112 80 Cover and book design by Robin Remaley All rights reserved. Turbine Steam Path Maintenance and Repair Volume Two / William P. Library of Congress Cataloging-in-Publication Data Sanders, William P. STEAM PATH MAINTENANCE AND REPAIR Volume 2 William P.
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