What is the friction loss per length for 65mm Hi-Combat?

What is the friction loss per length for 65mm Hi-Combat?

• A. 25 kPa / length
• B. 50 kPa / length
• C. 100 kPa / length
• D. 75 kPa / length

Answer: (B)

Friction loss scales with hose size, flow, and length, and for a given flow the larger diameter hose carries less loss per metre. In practice, standard friction loss tables for a 65 mm Hi-Combat are read as a loss of about 50 kPa for every 100 metres of hose. That makes the per-length value 50 kPa per length (per 100 m). So the correct choice reflects this typical table value. If you’re laying 200 m, you’d expect roughly 100 kPa of loss; 300 m would be about 150 kPa, and so on. This helps determine pump discharge pressure to maintain the desired nozzle pressure.

Friction loss scales with hose size, flow, and length, and for a given flow the larger diameter hose carries less loss per metre. In practice, standard friction loss tables for a 65 mm Hi-Combat are read as a loss of about 50 kPa for every 100 metres of hose. That makes the per-length value 50 kPa per length (per 100 m). So the correct choice reflects this typical table value.

If you’re laying 200 m, you’d expect roughly 100 kPa of loss; 300 m would be about 150 kPa, and so on. This helps determine pump discharge pressure to maintain the desired nozzle pressure.