What is the maximum hot water velocity recommended to prevent pipe erosion?

The recommended maximum hot water velocity to prevent pipe erosion is typically around 6 feet per second (fps). This threshold is significant in plumbing design because when water flows through pipes at high velocities, it can cause excessive turbulence and pressure fluctuations. Over time, these conditions lead to erosion of the pipe materials, potentially resulting in leaks or failures.

Design guidelines and standards, such as those proposed by organizations specializing in plumbing and mechanical systems, often suggest that maintaining water velocities below this level aids in prolonging the lifespan of piping systems and minimizing maintenance requirements. This velocity consideration is crucial as it balances efficiency with durability.

While lower velocities, such as 3 fps or 4 fps, are advantageous for reducing the risk of erosion even further, they may not be practical for all systems where efficiency and heating speed are also a concern. Higher velocities like 8 fps are generally outside the safe operating limits for most piping materials, leading to the risk of significant damage over time. Thus, the 6 fps recommendation serves as a balance that enhances system reliability and material integrity.