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Posted by Bob D. on October 20, 2004 at 05:23:51:
In Reply to: Re: water column and water level controller posted by Tim D on October 19, 2004 at 17:45:58:
: I would suggest surface skimming boiler for an hour. Check initial surface skimming water quality for oil or milky oil/water. We had same problem with level surging after even minor plumbing work.
Have surface blown repeatedly and regularly. Also installed conductivity cells, blowdown controllers, and Apollo valves for surface blow. Chemical vendor says tests are all within normal limits (yeah, I know, I don't trust him very far . . .he always wants to sell some snake oil). With the heating season coming on, I'm afraid I've got nothing good to show for the efforts so far. - Bob D.
: I plan to install (2) new MM150S on a two low pressure boilers later this year. These were recommended over the MM67lwco which are allowing feed pumps contacts to stick on periodically. The MM150S are rated for electric feed pumps and have a larger differential.
Even with the feedwater isolation valves shut (I can go maybe 10 minutes without), the boilers still "surge" (The water columns look like old style percolator coffee pots, it is NOT normal swell or shrink on burner light-off and shutdown. I've accounted for that). It doesn't apear that the pumps and feedwater valves have much to do with it, but I've been wrong before . . . .- Bob D.
: I will have to see if we have problems when we install.
I'm out of time . . .-Bob D.
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