When no specific information is available, what is the recommended discharge pressure into a fire department connection for a sprinkler system?

The recommended discharge pressure into a fire department connection for a sprinkler system, when no specific information is available, is 150 psi. This pressure is generally accepted as a standard guideline, providing a sufficient force to ensure that water reaches the sprinkler heads effectively and efficiently, especially during a fire emergency.

Maintaining this pressure helps to compensate for any potential losses in the system, such as friction loss during water flow, ensuring optimal performance of the sprinkler system when activated. Additionally, using 150 psi as a standard allows for uniformity across various systems and installations, which can be vital for fire departments responding to emergencies, as they can rely on a standard pressure for their operations.

Other pressures, such as 100 psi, 125 psi, or 175 psi, may not provide adequate performance or could create issues depending on the specific circumstances of pressure losses and system design. Therefore, the 150 psi recommendation strikes a balance between sufficient pressure to ensure effective operation of the sprinkler system while also aligning with industry standards.