What K-factor would result with 65 gpm (246 lpm) flowing at 14.

With 65 gpm flowing at 14.9 psi, a K-factor of approximately 11.2 (160) can be deduced using the K-factor formula, which relates flow, pressure, and the K-factor in sprinkler system calculations.

References: Hydraulic calculations principles in fire protection engineering, which use the K-factor to relate the flow rate through a sprinkler to the pressure at which it operates.