Core TradesQuestion 144 of 700
Excessive water velocity in copper supply piping is primarily a concern because it can cause:
a.The water to become too cold
b.The system pressure to increase permanently
c.Backflow at every fixture
d.Erosion-corrosion of the pipe wall and objectionable noise
Explanation
High velocity (generally kept below about 5-8 feet per second) scours the inside of copper pipe, causing erosion-corrosion that thins and eventually pinholes the wall, and it produces noise. Velocity does not change water temperature, permanently raise pressure, or by itself cause backflow at fixtures.
Law Reference: 2025 CA Plumbing Code §610.0Practice all 700 questions free — no signup required.
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