What is the friction loss percentage in a 2 1/2 inch hose?

In a fire service context, friction loss is a critical factor when calculating the needed pressure in a hose line. The friction loss for a 2 1/2 inch diameter hose can vary based on several factors, including the flow rate and the length of the hose. Typically, for a 2 1/2 inch hose, friction loss can be approximated at around 60% or less when calculating the pressure loss per 100 feet of hose at common flow rates.

This percentage indicates that as the volume of water moves through the hose, there is an energy loss due to the resistance encountered from the inner walls of the hose. The choice of 60% or less is standard among fire service guidelines and is reflective of the expected performance of this size hose under typical operating conditions. This understanding is crucial for fire pump operators as it assists in ensuring adequate water delivery at the nozzle during firefighting operations.

The other options suggest higher percentages that would be less realistic for a 2 1/2 inch hose under normal flow conditions. In practice, higher friction loss percentages would not align with the common operational standards set by fire service protocols. By recognizing friction loss as a measurable aspect of hose performance, operators can make informed decisions about water