What size is the most remote hose connection referenced with the 100 gpm at 65 psi requirement for standpipes?

• A. 1 inch
• B. 1 1/2 inch
• C. 2 inch
• D. 2 1/2 inch

Answer: (B)

The requirement is about ensuring the farthest standpipe outlet can deliver 100 gpm at 65 psi at the point where a handline is connected. That connection is sized to match a standard handline hose, which is 1 1/2 inches. A 1 1/2" hose is the typical size firefighters use for standpipes, and the system is designed so that even at the most remote outlet, a 1 1/2" handline can achieve 100 gpm with about 65 psi available at the nozzle after accounting for friction losses along the hose.

Smaller outlets, like 1 inch, wouldn’t reliably deliver 100 gpm at that pressure. Larger outlet sizes (2 inch or 2 1/2 inch) aren’t the standard remote hose connections for NFPA 14 handlines and aren’t required to be the most remote connection—the 1 1/2 inch size is the intended remote hose connection for meeting the 100 gpm at 65 psi criterion.