Commercial Building Inspector B2General Administration, Permits, and PlansHard
A commercial building inspector is performing a final inspection for a new 5-story Group R-1 hotel. The building has a standpipe system. What is the minimum residual pressure required at the topmost outlet of a Class I or Class III standpipe system?
- A100 psi
- B75 psi
- C65 psi
- D80 psi
Show answer & explanationAnswer & explanation
Correct answer: A. 100 psi
According to NFPA 14, Section 7.8.1.1, the minimum residual pressure required at the hydraulically most remote 2 1/2-inch hose connection outlet of a Class I or Class III standpipe system is 100 psi.
Why the other options are wrong
- B. 75 psi is not a standard minimum residual pressure for standpipe systems.
- C. 65 psi is the minimum for Class II standpipe systems at the most remote 1 1/2-inch hose connection.
- D. 80 psi is not a standard minimum residual pressure for standpipe systems.
Standpipe Topmost Outlet Residual Pressure
The minimum residual pressure required at the hydraulically most remote 2 1/2-inch hose connection of a Class I or Class III standpipe system.
- Ensures adequate water flow and pressure for fire department operations.
- Specific requirements are detailed in NFPA 14, Standard for the Installation of Standpipe and Hose Systems.
- Critical for high-rise or large buildings.
Memory trick: Topmost outlet, Class I/III, 100 psi, no 'ifs'.