What is the hose coefficient for 2 1/2 inch hose?

What is the hose coefficient for 2 1/2 inch hose?

• A. 2
• B. 0.5
• C. 3
• D. 1

Answer: (D)

The hose coefficient is the constant used in quick friction-loss estimates for handlines. It depends on hose diameter, with larger-diameter hoses having less resistance per gallon and thus a smaller coefficient. For 2 1/2 inch hose, the standard coefficient used in practice is 1. That means friction loss scales with the flow rate and the hose length using a straightforward multiplier, keeping calculations manageable during drills. If you saw a higher number, like 2 or 3, it would overstate the friction loss for this size hose, while a smaller number such as 0.5 would understate it.

The hose coefficient is the constant used in quick friction-loss estimates for handlines. It depends on hose diameter, with larger-diameter hoses having less resistance per gallon and thus a smaller coefficient. For 2 1/2 inch hose, the standard coefficient used in practice is 1. That means friction loss scales with the flow rate and the hose length using a straightforward multiplier, keeping calculations manageable during drills. If you saw a higher number, like 2 or 3, it would overstate the friction loss for this size hose, while a smaller number such as 0.5 would understate it.