Posted by jtown on January 22, 2000 at 12:26:20:
In Reply to: Knocking HW Boiler posted by George Flanagan on January 22, 2000 at 10:57:20:
Localized boiling is usually from letting solids build up 'til they block water from getting into the bottom of a section or waterleg etc. Steam rises and water has to then flow downward, or leak into the bottom of the area. Or there may be excessive heat applied to an area from overfiring, broken chamber etc. Has the boiler been blown down regularily? Do you get a blast of water, or is it slow? If you or others have to clear one, valving off the piping, you could more easily shut it down, cool, drain and remove boiler cocks and rod out the best you can with a wire and run the piping to the other side. Rod out all the openings that are being opened and remove bushings to get more access if needed, and blast with a hose if possible.