What is the elevation pressure loss per floor when calculating friction loss?

The correct answer regarding the elevation pressure loss per floor when calculating friction loss is based on the standard practice within fire service operations. The accepted loss is 5 psi per floor. This figure is grounded in the principle that as water travels vertically, the weight of the water and the gravitational pull exert a pressure loss that can be quantified.

When a hose is elevated, the water must work against gravity to rise through each level of a building. The general rule of thumb used in fire service is that for every vertical floor the water must travel, the pressure will drop approximately 5 psi. This standard aids firefighters in quickly calculating how much pressure will be needed from the pumping apparatus to effectively deliver water to the desired height.

Understanding this standard is crucial for effective fireground operations, as it helps ensure that adequate pressure is maintained to achieve the necessary flow rates for firefighting efforts. The incorrect options reflect different interpretations of elevation pressure loss but do not align with the established method typically practiced in the field.