Air-pressurized standpipes in demolition and new structures will have a pressure not exceeding how many psi?

In the context of air-pressurized standpipes, the maximum pressure specified is critical for safety and operational effectiveness. Air-pressurized standpipes are designed to enhance fire protection in construction sites and buildings under demolition. The specified pressure not exceeding 25 psi ensures operational integrity while preventing damage to the standpipe system or creating hazardous conditions.

This maximum pressure is intended to be high enough to allow adequate water flow when needed, while simultaneously protecting the integrity of the piping system, fittings, and connections, which could be compromised if excessively high pressures were allowed. It also aligns with industry standards and practices that dictate the safe and effective operation of standpipe systems, ensuring they are not only functional but also maintain safety protocols during emergencies or when firefighting efforts are conducted.

The other options reflect lower maximum pressures which, while they may be safer for certain applications, do not meet the operational requirements of air-pressurized standpipe systems in the context of demolition and new construction. Therefore, 25 psi stands out as the correct and appropriate limit for these systems.