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Posted by joe mc. on November 08, 2004 at 15:11:00:
In Reply to: Re: Difference posted by Rick on May 10, 2004 at 17:23:56:
: : : : Maybe I should rephrase my question.I am trying to say as far as being an operator accustomed to a plant that runs 150, and going to a plant that runs 800. I understand what you are saying, but I am looking for differences as far as taking swings...the way the boilers behave...that kind of stuff...things you would do with an 800 lb system that you would never do with a 150...or vice versa. Hope I am being clear. Thankyou for your kind response, tho...:)
: : : Hey. :) Curious...can anyone share with me the difference between operating boilers at say....150lbs and 800lbs....pressure, of course. Just curious what the big difference is, and any different precautions or strategies...would appreciate any info...
: : : alot! temperture for one is much greater. volume changes,ex: the more pressure aplied to a pound of steam the less space it occupies. flow rate changes. your boiler auxilliares may have to change, feed pressure, releif valves, limit switches, may have to replace valves and lwco due to pressure ratings.
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: From an operator's perspective, not a lot other than the boiler operating at 800 psi is generating superheated steam compared with the saturated steam generated by the 150 psi boiler.
: The 800 psi boiler will more likely have better controls that can react to load changes better than the 150 psi boiler. This means you most likely have 3 element drum level on the 800 psi compared to single or 2 element on the other boiler. The controls will most like be in better calibration on the higher pressure boiler because it is probably making money for the owner by supplying steam to a turbine generator or to refinery, paper mill or chemical plant process.
The 800psi steam does not have to be superheated. I work on boilers that supply 3000psig saturated steam...