What is a common visual signal that indicates a distribution pipe may be corroded?

Discoloration or pinholes on the pipe is a significant visual indicator of corrosion in distribution pipes. Corrosion often manifests as changes in the pipe's surface, which can lead to visible discoloration. This typically occurs due to the electrochemical reactions taking place in the material, resulting in rust forming, which can give the pipe a reddish-brown hue. The presence of pinholes indicates that small areas of the pipe's surface have corroded through, compromising the integrity of the piping and potentially leading to leaks. Identifying these signs early can help in maintaining the system, preventing more severe issues, and ensuring the distribution system remains safe and effective for water transport.

Other signs such as cracking may indicate structural damage, but pinholes and discoloration are more directly associated with the gradual process of corrosion specifically. Increased water pressure is not a typical sign of corrosion, as corrosion usually leads to leaks that would decrease pressure. Similarly, a foul smell could point to contamination or organic materials rather than corrosion itself. Thus, recognizing discoloration and pinholes is crucial for diagnosing corrosion in distribution pipes.