Which of the following is a common sign of piping corrosion that requires maintenance?

• A. Recent rust-proof coating has been applied to the piping.
• B. Visible rust, pitting, or weakened pipe; leaks or reduced flow.
• C. The piping shows a new protective coating.
• D. No corrosion signs but pressure is normal.

Answer: (B)

Piping corrosion shows up when metal is deteriorating, and the clearest indicators are visible rust, pitting, or thinning of the pipe, often accompanied by leaks or reduced flow. These signs point to actual material loss and compromised integrity, so maintenance is needed to repair or replace affected sections and to address the conditions causing corrosion, such as water chemistry. Preventive measures like rust-proof coatings or protective coatings are actions taken to prevent corrosion, not signs of existing deterioration. If there are no corrosion signs and pressure is normal, there isn’t an issue of corrosion to address.