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Posted by Joubert Trovati on June 10, 2004 at 23:25:11:
In Reply to: boiler scale posted by DEREK SEWELL on April 03, 2004 at 22:56:40:
Dear Derek:
This kind of scale, with this color, low density and insoluble in HCl, may be caused by organic matter in water, such as oil, grease or another contaminant that has deposited over the heating surface. You can estimate the amount of organics in the deposit by heating it at 550ºC and measuring the loss of mass.
I advise you to check a possible contamination in feed water, condensate line, etc.
Hope you be successful.