While circulating heated sulfuric acid through a feed water heater of a flash evaporator for the purposes of scale removal, what would be the indication of the continued presence of scale?

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Accepted Answer

Change in color (turning to orange with a pH of 4.0) and continued venting of carbon dioxide gas.

Answer

Change in color (turning to orange with a pH of 4.0) and no more venting of carbon dioxide gas.

Answer

No change in color (remaining at red with a pH of 2.0) and continued venting of carbon dioxide gas.

Answer

No change in color (remaining at red with a pH of 2.0) and no more venting of carbon dioxide gas.

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