Which hose size has a flow range that begins at 100 gpm?

Which hose size has a flow range that begins at 100 gpm?

• A. 1.5 inch
• B. 1.75 inch
• C. 2 inch
• D. 2.5 inch

Answer: (C)

Flow rate through a hose is mainly governed by its diameter and the pressure at the nozzle. A larger diameter provides more cross-sectional area and less friction loss for the water, so you can push more water through at the same pressure. Among common fire-hose sizes, the 2-inch line is the first standard size that typically delivers starting flow around 100 gpm when used with standard attack pressures. Smaller, more maneuverable hoses generally have lower minimum flows, while larger lines can deliver well over 100 gpm. So the 2-inch hose is the one whose flow range begins at about 100 gpm.

Flow rate through a hose is mainly governed by its diameter and the pressure at the nozzle. A larger diameter provides more cross-sectional area and less friction loss for the water, so you can push more water through at the same pressure. Among common fire-hose sizes, the 2-inch line is the first standard size that typically delivers starting flow around 100 gpm when used with standard attack pressures. Smaller, more maneuverable hoses generally have lower minimum flows, while larger lines can deliver well over 100 gpm. So the 2-inch hose is the one whose flow range begins at about 100 gpm.