Which item is NOT typically considered when choosing attack line length and diameter?

• A. Target flow
• B. Nozzle type
• C. Brand of hose
• D. Weather conditions

Answer: (D)

Sizing an attack line is about delivering the needed water to the fire at a workable pressure. The key factors are the target flow you plan to deliver, the nozzle type and its required pressure for that flow, and the friction losses along the hose run. Weather conditions don’t change these hydraulic requirements, so they aren’t part of the math you use to pick line length or diameter. The hose diameter is chosen based on the friction loss data for the line to meet the target flow within the pump’s discharge pressure, while brand of hose doesn’t drive the sizing decision.