NFPA 14 minimum residual pressure at any 2-1/2 in standpipe outlet?

NFPA 14 minimum residual pressure at any 2-1/2 in standpipe outlet?

• A. 100 psi
• B. 65 psi
• C. 120 psi
• D. 90 psi

Answer: (A)

Standpipe systems are designed to deliver a reliable fire stream from each 2-1/2 inch outlet, even at the furthest point in the system. NFPA 14 specifies a minimum residual pressure of 100 psi at any 2-1/2 inch standpipe outlet when water is flowing. This level of pressure ensures that, after accounting for friction losses in the piping, fittings, and any elevation changes, the nozzle will still have enough pressure to produce an effective stream for firefighting. The other options would either undershoot or overshoot the standard, so 100 psi is the required minimum.

Standpipe systems are designed to deliver a reliable fire stream from each 2-1/2 inch outlet, even at the furthest point in the system. NFPA 14 specifies a minimum residual pressure of 100 psi at any 2-1/2 inch standpipe outlet when water is flowing. This level of pressure ensures that, after accounting for friction losses in the piping, fittings, and any elevation changes, the nozzle will still have enough pressure to produce an effective stream for firefighting. The other options would either undershoot or overshoot the standard, so 100 psi is the required minimum.