TECHNICAL PAPERS: Gas Turbines: Marine

Understanding Royal Navy Gas Turbine Sea Water Lubricating Oil Cooler Failures When Caused by Microbial Induced Corrosion (“SRB”)

[+] Author and Article Information
Richard Bolwell

 Warship Support Agency, UK MoD, Marine Propulsion Systems Integrated Project Team, Abbeywood Filton, Bristol BS34 8JH, UK

J. Eng. Gas Turbines Power 128(1), 153-162 (Mar 01, 2004) (10 pages) doi:10.1115/1.1926315 History: Received October 01, 2003; Revised March 01, 2004

A managed program to review engine failures and take necessary preventative measures has been in place successfully in the Royal Navy since the introduction of gas turbines into service in the 1970s. One of the more prominent failure mechanisms with the Tyne RM1C and Spey SM1A engines has been the degradation of main line bearings accounting for 25% of all engines rejected. Historically, since the first recorded incident in March 1987, the failures pointed to poor performance of the bearings themselves. However, maintenance studies and recent analysis indicates that a vast proportion have occurred through previously unidentified chloride corrosion as a result of contamination of the lubricating oil system with salt water from the seawater lubricating oil cooler (SWLO cooler). Despite joint ownership of both engine variants with the Royal Netherlands Navy, there was no clear evidence until about five years ago to suggest why tube perforation was occurring. Indeed, the fact that failures have only occurred in Royal Navy service is an interesting twist to the problem. This paper summarizes the phenomenon of SWLO cooler corrosion caused by Microbial Induced Corrosion (principally Sulphate Reducing Bacteria—SRB). It highlights the conditions in which SRB occurs along with demonstrated prevention in Royal Navy gas turbine service through the combined efforts of maintenance and development of a new titanium tubestack. The fault finding and remedial recovery experience may well be of interest to operators of marine gas turbines, both naval and commercial, who use tube type heat exchangers, especially when operating or undertaking work in estuarial waters and nontidal basins or when undertaking littoral duties. This is a practical view of the issue from an operators perspective and while utilizing a wealth of research and technical data available on the subject, it relates the issues at hand to the particular corrosion problem and is not intended as an introduction into organic chemistry.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Schematic representation of SWLO cooler

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Figure 2

Cooler on palette with CuNi tubestack in foreground

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Figure 3

Sectional arrangement through SWLO cooler

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Figure 4

Corrosion of the CuNi fixed end plate and deposits in the exposed tube ends

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Figure 5

Corrosion of the CuNi sliding end. Tubes exhibiting end slotting and wall thinning

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Figure 6

CuNi tubestack showing through hole perforation

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Figure 7

CuNi tubestack through hole perforation, wall thinning, presence of black deposit, and oxide film

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Figure 8

CuNi tubestack through hole perforation localized pitting and brown copper oxide

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Figure 9

Temperature dependence of electro chemical potentials. HMS Sultan Titanium SWLO cooler static testing.

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Figure 10

Overview of HMS Sultan test rig water box inlet side assembly, after 8weeks standing

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Figure 11

Absence of notable corrosion on titanium tubestack, remaining shiny throughout

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Figure 12

Crevice region shows slight discoloration but it is not deteriorated

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Figure 13

Titanium tubenest in service on HMS Edinburgh showing end plate original machining marks still intact

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Figure 14

Water box inner surface



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