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Proceedings Paper

In-situ ultrasonic inspection of submarine shaft seal housing for corrosion damage
Author(s): Narendra K. Batra; Henry H. Chaskelis; Richard B. Mignogna
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Paper Abstract

The interior of the housings of primary and backup shaft seals of 637 class submarines are exposed to sea water during service and become corroded during service. Corrosion damage evaluation requires disassembly of the housing and visual inspection. In this paper, we present quantitative results of in situ nondestructive ultrasonic technique developed for the inspection of the seal housings. Due to vast variations in velocity in the seal material, the velocity was determined at suitable sites not subjected to corrosion and of known thickness from the blueprints. Using this normalized velocity and measured time-of-flight, we determined the thickness of the seal housing at various locations on the circumference. Subsequent mechanical thickness measurements, made when the housings were removed from service, agreed within the predicted uncertainty of 1.5% of ultrasonic measurements. This technique for the assessment of corrosion damage saves time and money, by preventing premature disassembly and downtime for the submarine.

Paper Details

Date Published: 19 June 1995
PDF: 7 pages
Proc. SPIE 2459, Nondestructive Evaluation of Aging Maritime Applications, (19 June 1995); doi: 10.1117/12.212550
Show Author Affiliations
Narendra K. Batra, Naval Research Lab. (United States)
Henry H. Chaskelis, Naval Research Lab. (United States)
Richard B. Mignogna, Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 2459:
Nondestructive Evaluation of Aging Maritime Applications
Richard B. Mignogna, Editor(s)

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