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Posted by Russ on June 29, 2002 at 22:03:31:
I work at a plant that has hog fired hot water boilers that heat kilns to dry wood. The kilns are controlled by a computer, and occasionally crash. When the computer has a problem the valves leading to the kilns close and the water stops circulating resulting in extreme temperature and pressure in the boilers. Even if the fuel feed system stops, there is still enough fuel in the boilers to continue to create lots of heat.
The safety valves do there job, but it still shakes the building enough to break hot water unions and valves.
My question is: Should we just change out the valves so that they fail open, or is there more to it than that?
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