TCFP Plans Examiner Practice Test

What is the minimum required residual pressure for a water supply system established by fire protection engineers?

1. 15 psi

2. 20 psi

3. 25 psi

4. 30 psi

The correct answer is: 20 psi

The minimum required residual pressure for a water supply system is crucial in ensuring that during a fire event, firefighters have access to adequate water flow to combat the fire effectively. Fire protection engineers typically establish a standard residual pressure requirement, which is generally accepted to be 20 psi. This pressure is essential to maintain a sufficient volume of water flow, allowing for effective firefighting operations even when other demand exists, such as from sprinkler systems or hydrants opened by firefighters. Setting the regulatory standard at 20 psi helps ensure that the system is robust enough to deliver the needed flow rate without compromising the pressure needed for effective firefighting. This value is also aligned with commonly accepted codes and standards in fire protection engineering, facilitating consistency and reliability in fire protection efforts across different installations and systems. Maintaining a 20 psi residual pressure can help ensure that water supply systems can respond adequately in emergencies, thus enhancing public safety measures during fire incidents.