What is the pump pressure when filling a subway standpipe system?

The pump pressure when filling a subway standpipe system is typically set at 100 psi (pounds per square inch). This pressure is established as a standard to ensure effective water delivery within the standpipe system, which is crucial in managing fire conditions in such environments. A pressure of 100 psi strikes a balance between providing adequate water flow necessary to combat fires effectively while also being manageable in terms of maintaining the structural integrity of the standpipe system and ensuring that firefighters can operate safely and effectively during emergency situations.

Higher pressures than this could create potential hazards, such as damage to the standpipe infrastructure or difficulties in firefighter operations due to excessive back pressure. Conversely, lower pressures might not provide sufficient water flow needed for firefighting efforts. Therefore, 100 psi is an industry-recognized standard for this application.