What general maintenance task performed on heat exchangers is a surface cleaning technique involving entraining sand into a stream of high-pressure air to remove scale or other deposits from accessible surfaces?
A. Acidizing
B. Backwashing
C. Water blasting
D. Sandblasting
A. Incorrect. Acidizing is a surface cleaning technique that uses acid to remove scale or other deposits from accessible surfaces.
B. Incorrect. Backwashing (back-flushing) is a procedure in which the direction of flow through the exchanger is reversed to remove solids that have accumulated in the heat exchanger.
C. Incorrect. Water blasting is a surface cleaning technique used on heat exchangers that uses high-pressure jets of water to remove scale or other deposits from the inside of exchanger tubes.
D. Correct. Sandblasting is a surface cleaning technique involving entraining sand into a stream of high-pressure air to remove scale or other deposits from accessible surfaces.
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