A plumber is considering the velocity of water in a 50 mm (2") copper pipe supplying a commercial building. Excessive water velocity can lead to what primary issues within the plumbing system?

Question: A plumber is considering the velocity of water in a 50 mm (2") copper pipe supplying a commercial building. Excessive water velocity can lead to what primary issues within the plumbing system?

Answer options:

• Reduced water heating efficiency and increased scaling. ✅ Water hammer, erosion, and increased noise.
• Decreased actual pipe diameter over time and reduced flow.
• Formation of air pockets and increased bacterial growth.

Correct answer: Water hammer, erosion, and increased noise.

Explanation: Excessive water velocity is a common cause of detrimental issues such as water hammer (sudden pressure surges), accelerated erosion of pipe material, and increased noise (whistling or humming) within the piping system. While some other options might be secondary effects or related to water quality, these three are direct and primary consequences of high velocity. Reduced heating efficiency or scaling are more related to temperature and water chemistry.