The required residual pressure when computing available water supply in a specific area is _____ PSI.

The required residual pressure when computing available water supply is designated as 20 PSI. This figure is significant because it represents the minimum pressure necessary to ensure that water can be effectively delivered to a fire incident and still provide enough force to reach the necessary elevation for firefighting operations.

A residual pressure of 20 PSI is essential for maintaining a reliable flow of water through fire hoses and to ensure that fire suppression systems can operate efficiently. This requirement takes into account factors such as elevation, friction loss in hoses, and the need for adequate pressure to operate nozzle and firefighting equipment efficiently. Ensuring that there is a minimum residual pressure helps to maintain effective firefighting capabilities in the area being inspected.

This standard aligns with fire protection guidelines and helps ensure that the water supply is sufficient to meet emergency service needs, thereby protecting lives and property in the event of a fire.