Question 505Steam Plants - Assistant Engineer

The correct answer is B) avoid internal tube damage. When cleaning the waterside of boiler tubes with a powered rotary brush, it is important to keep the brush in constant motion to avoid causing damage to the internal surface of the tubes. If the brush is allowed to remain stationary on one spot, it can create pitting or gouging of the tube material, which can compromise the integrity of the boiler. Keeping the brush moving ensures an even, consistent cleaning action across the tube surface without causing localized damage. The other options, while potentially beneficial, are not the primary reason for keeping the brush in motion during this cleaning process.