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.

Trades & Technology

You might also like to view...

What is the volume of the rectangular shape in the figure, in cubic inches? All dimensions are outside measurements, and the plate is 1/8” thick. Carry the answer to one decimal place.

Trades & Technology

____ includes items such as dust masks, safety glasses, gloves, and special footwear.

a. PPC b. PASS c. PPE d. FPC

Trades & Technology

Until about 1950, hogs were raised primarily for bacon

Indicate whether the statement is true or false

Trades & Technology

The occupant detection system measures the ________ of the person in the passenger seat.

Fill in the blank(s) with the appropriate word(s).

Trades & Technology