In-situ ultrasonic inspection of submarine shaft seal housing for corrosion damage

Narendra K. Batra; Henry H. Chaskelis; Richard B. Mignogna

doi:10.1117/12.212550

19 June 1995 In-situ ultrasonic inspection of submarine shaft seal housing for corrosion damage

Narendra K. Batra, Henry H. Chaskelis, Richard B. Mignogna

Proceedings Volume 2459, Nondestructive Evaluation of Aging Maritime Applications; (1995) https://doi.org/10.1117/12.212550
Event: Nondestructive Evaluation of Aging Infrastructure, 1995, Oakland, CA, United States

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.

Citation Download Citation

Narendra K. Batra, Henry H. Chaskelis, and Richard B. Mignogna "In-situ ultrasonic inspection of submarine shaft seal housing for corrosion damage", Proc. SPIE 2459, Nondestructive Evaluation of Aging Maritime Applications, (19 June 1995); https://doi.org/10.1117/12.212550

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