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QUESTION:What about the energy effects of the ship "working" or flexing with
concussion, change in bouyancy, and shifting the center of bouyancy. If the
furnace bars were as massive as you state, they might be susceptible to
forces on the large scale that would not be detected on the small scale.
The bars were probably not designed to bend repeatedly. Metal exhaustion
could produce effects that appeared similar to sagging.
I remember when I learned about boilers on my first ship, a steamer, and the
condition of the nozzles were of grave concern to the men who tended them.
The temperature of those were kept constant by injection of fuel and low
pressure steam, but there was a real risk of damaging the nozzle if it was
not burning properly. I lit fires in a boiler as part of my drive for
Surface Warfare Qualification, and it was serious business, and a risky
procedure.
ANSWER: I agree that the nozzels on an oil burner are a critical part but they are
incredibly mroe delicate than the furnace grates we are talking about. .
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