A minimum water supply must be able to deliver the required volume of water to the highest sprinkler head in a building at a residual pressure of what?

The correct answer, 150 psi, reflects the standard industry requirement for sprinkler systems to ensure adequate water supply and pressure for effective firefighting operations.

Sprinkler systems are designed to operate effectively under specific conditions, and maintaining a residual pressure of 150 psi at the highest sprinkler head is critical. This pressure level ensures that water is delivered efficiently and can overcome the potential friction loss in the piping system, as well as any elevation changes. Adequate pressure is essential not just for the operational effectiveness of the system but also for the safety of the occupants and firefighters in case of a fire event.

This pressure allows for an optimal flow of water to suppress fires effectively, protecting lives and property. Additionally, it aligns with various NFPA (National Fire Protection Association) guidelines that govern fire protection systems, which emphasize the importance of having sufficient pressure to operate sprinklers effectively throughout a building.

Understanding these specifications is fundamental for fire department officers and engineers in planning and maintaining fire protection systems.