What pressure is specified to accompany the 100 gpm flow requirement to the most remote 1/2 in. hose connection?

What pressure is specified to accompany the 100 gpm flow requirement to the most remote 1/2 in. hose connection?

• A. 50 psi
• B. 65 psi
• C. 80 psi
• D. 100 psi

Answer: (B)

Delivering 100 gpm to the farthest hose connection requires a specific residual pressure at that outlet. NFPA 14 specifies 65 psi at the most remote hose connection when the system is delivering 100 gpm. This pressure accounts for friction losses along the standpipe run and ensures the nozzle at the remote outlet has enough pressure to deliver the intended flow. Other pressures listed would not meet the standard criteria: too low would fail to provide 100 gpm at the remote outlet, while higher pressures are unnecessary and could lead to over-pressurization and larger system demands. Therefore, 65 psi is the correct accompanying pressure.

Delivering 100 gpm to the farthest hose connection requires a specific residual pressure at that outlet. NFPA 14 specifies 65 psi at the most remote hose connection when the system is delivering 100 gpm. This pressure accounts for friction losses along the standpipe run and ensures the nozzle at the remote outlet has enough pressure to deliver the intended flow.

Other pressures listed would not meet the standard criteria: too low would fail to provide 100 gpm at the remote outlet, while higher pressures are unnecessary and could lead to over-pressurization and larger system demands. Therefore, 65 psi is the correct accompanying pressure.