What is the term for the loss of pressure felt along the length of the hose?

The loss of pressure felt along the length of the hose is referred to as friction loss. This phenomenon occurs due to the interaction between the water flowing through the hose and the hose walls. As the water moves, it encounters resistance, or friction, which cumulatively results in a decrease in pressure from the source to the discharge end.

Friction loss is influenced by several factors, including the diameter and length of the hose, the type of material it is made from, and the flow rate of the water. As the diameter of the hose decreases or the length of the hose increases, the friction loss becomes more significant, leading to a greater loss of pressure. Accurate calculations of friction loss are crucial for effective firefighting operations, as they determine how much pressure must be maintained at the pump to ensure adequate water delivery to the nozzle.

Factors like elevation loss pertain to changes in pressure due to changes in the height of the hose or water source, while static loss and dynamic loss address different pressure dynamics not directly related to the movement of water through the hose. Thus, understanding friction loss is essential for pump operators to ensure they can effectively manage water delivery to combat fires.