What is the minimum pressure required in systems designed for fire protection?

In fire protection systems, maintaining an adequate pressure is essential to ensure that water can be effectively delivered to extinguish fires. The minimum pressure requirement of 20 psi is established based on the need to ensure that fire hydrants and sprinkler systems can adequately function under various conditions, such as during high demand or when other pressures in the system fluctuate.

This pressure is sufficient to ensure that water can not only reach areas at a height in multistory buildings but also provide an effective flow rate required to suppress fires. This flow rate is critical, as any inadequacy in pressure can lead to insufficient water supply during an emergency situation, which can be catastrophic.

In summary, a minimum pressure of 20 psi provides a balance between effective firefighting capabilities and system functionality, reflecting established safety standards and practices in the design of fire protection systems.