When pumping to a standpipe system, a pump operator should allow what amount of friction loss for the standpipe system?

When pumping to a standpipe system, it is standard practice for a pump operator to allow approximately 25 psi of friction loss. This value is a guideline that reflects the typical pressure required to overcome the resistance created by the water flowing through the plumbing of a standpipe system.

Friction loss occurs due to the turbulence and the contact of water with the walls of pipes, which is affected by various factors including the length and diameter of the hose, the fittings involved, and the water flow rate. Acknowledging this loss is crucial for ensuring adequate pressure is maintained at the outlets of the standpipe system when firefighters are operating it.

Understanding and applying this standard helps to ensure that sufficient pressure is provided for effective firefighting operations and that the flow of water is sufficient to meet the incident needs. By using 25 psi as a reference point, pump operators can effectively calculate the necessary pump discharge pressure to maintain desired performance levels in real-world conditions.