![]() ![]() If the maximum velocity is only anticipated for a short period of time, a velocity slightly higher than the listed velocities may be selected. When determining the pipe size, engineers often consider the anticipated length of time that the system will flow at the maximum velocity. Table 1 lists the recommended maximum velocities. Several piping-material manufacturers recommend maximum velocities of flow for plumbing water distribution systems. The system would have to be evaluated for protection from hydraulic shock. However, this high a velocity can result in higher intensities of hydraulic shock or water hammer. ![]() Velocities of less than 12 feet per second tend to not create high levels of noise in the piping system. The velocity of flow is established by evaluating the performance of the piping material, the noise in the pipe, and the potential for elevated hydraulic shock. When attempting to determine the appropriate pipe diameter for a water distribution system, one needs to know the velocity of flow and the flow rate. ![]()
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