I was on the Triumph sometime ago. It is a total electric drive ship. There six 10 MW generators for propulsion and auxiliaries. The toilets flush by vacuum and use very little water. The flush stuff is all handled by vacuum because there is not enough fall to slope the pipes.
Fresh water is produced by either vacuum distillation or reverse osmosis. Large amounts of power are required for meal preparation, refrigeration, and lighting. Emergency generators are located very high on the vessel, but because they are above the center of buoyancy introduce a large rolling moment.
It would certainly make sense to completely isolate and compartmentalize the propulsion generators, switch gear, support services etc to provide complete redundancy. I have to believe that is done to some extent. Very large container ships and crude oil carries have only 1 direct drive diesel. When it goes down it is tow time.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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