Date of Award

Spring 1982

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)


Mechanical Engineering

First Advisor

Matar, Joseph E.


The failure of closed, tube and shell type, steam extraction feedwater heaters is a common problem in the utility industry. The effects of these failures are: increased unit down time, reduced unit capability and reduced unit efficiency. The resultant costs can be substantial. The causes of these failures: corrosion, cracking, etc. have been examined in detail in the technical literature. The costs of feedwater heater failure, however, can be greatly reduced by properly timing the replacement of failing feedwater heaters. It is therefore proposed herein that closed feedwater heater replacement optimization be accomplished by: 1. Using early tube failure data to develop Weibull failure prediction models; 2. Calculating the costs of the various levels of heater failure as predicted; and, 3. Finally, using these costs in conjunction with replacement costs to pinpoint the time of optimal replacement.



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