Discussion
Foaming in a boiler is caused chiefly by
Answer: D
Correct answer: oil and suspended organic matter in the water
Foaming is the formation of a persistent layer of bubbles at the water surface, and it is caused by substances that lower the surface tension - oil, grease and suspended organic matter. The foam carries water over with the steam. The remedy is to remove the contaminant, by coagulation or by adding an antifoam, rather than to change the boiler conditions.
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