GM Engines Pass Offshore Tilt Test—Literature Available

A General Motors Electro-Motive Division production marine drilling power unit, incorpo- rating the EMD 20-cylinder diesel engine, has successfully completed the Det norske Veritas (DnV) 15 degree permanent inclination test.

The approval of DnV applies to EMD's complete line of 8, 12, 16 and 20-cylinder naturally aspirated and turbocharged diesel engines, as applied to the marine drilling power unit configuration.

The tests were conducted with the EMD 20F9B engine and consisted of 12 hours of running time at full-rated horsepower/speed. Witnessing the test were officials from Det norske Veritas, American Bureau of Shipping and Lloyd's Register of Shipping. The test is mandatory, at present, for generating sets used on offshore rigs and platforms requiring DnV certification.

The means to achieve the DnV 15-degree inclination requirement were based by Electro- Motive on a "total system" design approach; i.e.

engine, generator, modular accessory rack, and external lube oil tank mounted on a common base and interfaced, as necessary to provide a power "unit" capable of full-rated output.

During the 12-hour test the engine lube oil pressures and temperatures remained constant.

Normal engine start was achieved prior to initiation of each six-hour test and clear exhaust gasses were observed throughout the entire load testing.

Cooling water pressure and temperature remained constant during the test. After the test was completed, a complete airbox inspection was performed. This included an in-place examination of all pistons and liners. The crankshaft thrust bearing, the crankshaft upper and lower main bearings, the connecting rod upper and lower bearings, the turbocharger compressor thrust bearing, the turbine bearing, and planetary bearings showed only normal wear in polishing upon inspection.

For further information and literature, C i r c l e 3 4 o n R e a d e r S e r v i c e C a rd

Maritime Reporter Magazine, page 112, Nov 1984

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