Re: contamination in condensate return from plant

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Posted by Vern on April 22, 2001 at 19:02:05:

In Reply to: contamination in condensate return from plant posted by Scott on April 22, 2001 at 18:31:21:

: I work at a semi conductor manufacturer. An unknown source contaminates the
condensate return. We use D.I. water for feedwater. Normal readings
are;Alkalinity 300-400;Sulfite 200-400;Phosphate 30-50 ;
Cond.PH 7.5-8.5;Condensate and F.W. hardness is 0ppm.;Conductivity of Cond.
and F.W. is 10ppm. When contaminated the Alk. is
o.k.; Sulf.<120 and increasing chemical amt.
doesn't help raise it.;Phosphate is<10. We
triple amt. of chemical to raise it.; Cond.PH 10.5-11.0;Hardness is ok. Condensate Return Conductivity 300-500;Feedwater Conductivity 200-300. Boilers are60000lb.-no superheaters. Output is +- 1000000lbs./day. Any help would be appreciated.

Scott, I assume the normal readings you cite are for the boiler.
What are the readings you cite when the condensate is contaminated?
Are those readings in the boiler or in the condensate? I assume they are
boiler readings since you say you have to triple chemical levels to get
an increase in readings. When the condensate is contaminated the ph levels are high and the conductivity levels are high, is this correct?
What is the boiler pressure you operate at? Have you checked the condensate
for sulfite and phosphate? Have you checked the different processes
you do to see if you have an excess of makeup wate which might indicate a
leak to condensate?

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