The calculations provided here are approximate values based on careful in-house measurements taken on 100-meter hose lines laid out either in a straight line or flaked on flat ground. The underlying tests were conducted with a pressure range of 1 bar to 12 bar and with a flow rate of up to 9000 l/min on the following hoses:

• D25 30m Gollmer&Hummel Titan X-Treme
• C32 15m Gollmer&Hummel Titan 2F
• C38 15m Gollmer&Hummel Titan X-Treme
• C42 15m Gollmer&Hummel Titan X-Treme
• C52 15m Gollmer&Hummel Titan X-Treme
• B75 20m Gollmer&Hummel Titan X-Treme
• A110 50m Gollmer&Hummel Progress Supply
• F152 50m Gollmer&Hummel Progress Supply

Values outside this range are no longer based on precise measurement data and should be regarded as estimates. Unlike many other calculation models, this calculator does not rely on a constant friction coefficient. Instead, it uses a curve based on numerous data points for each hose diameter, reflecting the flow behavior of modern fire hoses, which differs from that of rigid pipes.

It should be noted that coupling intervals with Storz couplings have no significant impact on the calculated values.

The results provided are intended as guidelines and may vary slightly in practice. Additionally, manufacturing tolerances in fire hoses, particularly for smaller diameters, can have a considerable influence on hydraulic performance.

© 2024 Frank Reuter, Dr. Thomas Große et al.