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Posted by Wes on March 03, 2002 at 22:54:03:
In Reply to: Re: Boiler Anti-Foam posted by ron dille on March 01, 2002 at 23:42:32:
: : : Does anybody understand how anti-foam works? Have been using it for a few months about 1 quart per barrel of sulfite.
: : : I think the active ingredient is polyethylene glycol. Does it change surface tension or is it acting in some other way.
: : : Before our condensate conductivity often ran over 1000 uS, at times it was the same as boiler water.
: : : Now condensate runs 20-50 uS.
: there is a silicone based that is used in cooing and a glycol based that is used in boilers. sounds like you had carry over from the high tds levels. the defoamer will help with that. foam is uasually caused by oils , high tds or over feed of chemicals. you may want to look into this.
High TDS is definately part of the problem. We run high make-up because a large portion of our load is injection heating. This also a source of possible contamination if steam pressure drops and check valves don't hold.