When installing a pot feeder in a closed chilled water system in a tall building, what should be the minimum static pressure rating?

In a closed chilled water system located in a tall building, the minimum static pressure rating for a pot feeder is 300 psi. This rating is crucial because it ensures that the pot feeder can withstand the high pressures encountered in such systems, especially those that are elevated due to the building's height.

As water is circulated through a chilled water system, the pressure must be sufficiently high to overcome the vertical lift as well as the resistance through the piping and components. In tall buildings, these pressures can exceed normal expectations; therefore, a pot feeder rated at 300 psi provides a buffer to accommodate potential pressure spikes and ensures reliable operation without the risk of failure.

Other pressure ratings, while possibly adequate for shorter systems or different applications, do not meet the specific needs of elevated chilled water systems. A 150 psi rating may be too low in tall structures, while higher ratings like 600 psi or 900 psi are generally not necessary for the standard situations encountered in closed chilled water systems, making 300 psi the most practical and commonly accepted choice.