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Re: overheating and overpressure

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Posted by Vortech on June 30, 2002 at 07:48:18:

In Reply to: overheating and overpressure posted by Russ on June 29, 2002 at 22:03:31:

Well, in a properly designed system the safety valves should relieve the presure WELL before valve and piping failure occures.
what kind of temp's and presures do you see on a system crash?
whats normal operating temp /presures?
what kind of piping?

using the kiln as a heat sink during a failure might be possable if you can vent the heat (ie: open dampers or doors) automaticly, but this should not really be needed if system was designed right.

I would be....well Scared to operate a boiler/plant with conditions you discribed.
I also wonder if the valves to the kiln are closing to fast and the damage is cause by water hammer instead of over presure

: 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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