Jim, surprised someone like Louis and Clark didn’t report all that mechanized activity in Indiana, 1080 AD? I’m sure you meant 1980. LOL. The biggest motors that I know of in the 300k bbl per day refinery I work at are 8500hp they run reciprocating vapor compressors, 3 in that unit. The name plates say the are synchronous and turn 800 rpms. Just off the top of my head there are at least 12 other recip compressors that range from 2000 - 5000 hp. In general a third of them are spares so not all are in operation at once. There are many other motors on compressors or pumps in the 500 -2000hp range. I think the largest single hp producer in the refinery is a steam turbine operating a large blower/ compressor, I think it is in the neighborhood of 10,000hp. You mentioned piston air compressors one unit still has a couple of those in service, one of them looks to be 1950s vintage, 1955 is when the oldest parts of the refinery were built. There are at least a half dozen of those turbo style air compressors throughout the complex and range from 500 to 1500hp. About two years ago the refinery added a power plant, I think it is a 35mw unit and is said to only produce about 30 percent of the refinery’s needs.
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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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