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Posted by Gary on May 11, 2006 at 08:00:29:
In Reply to: Re: Boiler LWCO Question posted by Dirk Fenner on May 10, 2006 at 23:08:35:
: : : I run a 500hp Superior Wood Fueled Boiler. Very recently I have had problems with my Feedwater pumps short cycling. (on and off quickly and often). I have checked for steam leaks.(none) The water in the site tube on column seems to fluctuate a lot. (not like boil off just lever rising and lowering...almost a small bounce effect) It makes the pump's mercury switches go off often and even occasionally trips the LWCO alarm and shuts control circuit. Any ideas what could cause this condition? Thanks!!
: : Sounds to me like you have some sort of contamination of your boiler water. Many years ago I had an occasion where the water softener screwed up and let a very large amount of brine go into the boiler which caused a situation like you are describing. Check for possible condensate contamination. Steam leaks on the water column piping maybe could cause that. Good luck
: I would absolutely agree with the contamination issue.. check your conductivity of your incomming water, check the conductivity of your boiler water at blowdown.. and check the conductivity of your condensate water
: compair the numbers.. condensate should be o to 50 tds... if it is higher then you might have contamination in a return line....
: after you check all those e-mail me Imight be able to help
Quick Question, Are you adding a new Fatty acid based treatment? A couple of years ago our chemical rep recomended the lates greatest treatment to replace our amine program. The product when over-fed caused carry over into the system and the rising and lowering which you described. as well as some other adverse effects.
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