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

In a standpipe system, the friction loss refers to the pressure loss that occurs as water flows through piping due to the friction between the water and the interior surface of the pipes. When determining the appropriate friction loss that a pump operator should allow for, it is essential to consider the height and length of the standpipe, as well as the flow rates involved.

The correct allowance of 25 psi takes into account the operational dynamics of a standard standpipe system in various types of buildings, particularly in high-rise structures where friction losses can be significant due to longer pipe runs and additional fittings. This allowance ensures that sufficient pressure is maintained at the uppermost outlets, making sure that firefighters can effectively access the standpipe system during emergencies.

By understanding the pressure requirements in these systems, operators can optimize the performance of the fire suppression efforts, ensuring that the water reaches the necessary heights and volumes where it is most needed. This aligns with the common practice within fire service guidelines, which highlight that a higher pressure allowance is crucial for effective firefighting operations in multi-story buildings.