____________________ is a surface cleaning technique to remove scale or other deposits from accessible surfaces.
a. Acidizing
b. Water blasting
c. Backwashing
d. High-point bleeding
a. Correct. Acidizing is a surface cleaning technique that uses acid to remove scale or other deposits from accessible surfaces.
b. 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.
c. 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.
d. Incorrect. High-point bleeding is the process of venting gases from piping and equipment that are normally filled with liquid.
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