What is the pressure requirement for class III standpipe systems?

For Class III standpipe systems, the pressure requirement is specifically designed to meet the needs of both manual firefighters and automatic fire protection systems. These systems provide two types of outlets: 1½-inch hose connections for firefighting and 2½-inch hose connections for additional fire suppression tools.

The correct pressure requirement for Class III standpipe systems is set at 100 psi. This standard ensures that the water supply can deliver a sufficient volume and pressure for effective firefighting operations. Meeting this pressure requirement is essential for ensuring that firefighters can operate efficiently and safely when they connect their hoses to the standpipe system. A pressure of 100 psi is generally sufficient to overcome friction losses in the hoses and to adequately supply water to the nozzle to produce an effective firefighting stream.

Understanding the pressure requirement is crucial for sprinkler fitters and fire protection professionals, as it directly influences the design and installation of standpipe systems in buildings to ensure compliance with codes and regulations, as well as overall safety during emergency operations.