What is the maximum listed pressure for most standpipe and sprinkler systems?

What is the maximum listed pressure for most standpipe and sprinkler systems?

• A. 175 PSI
• B. 125 PSI
• C. 150 PSI
• D. 200 PSI

Answer: (A)

Standpipe and sprinkler systems are designed around a maximum listed pressure to keep every component—piping, valves, hose connections, and sprinkler heads—within what the equipment is tested and listed to handle. For most of these systems, that maximum listed pressure is 175 psi, reflecting common UL/FM listings and NFPA design practice. Staying at or below this limit ensures reliable operation and reduces the risk of component failure, leaks, or impaired sprinkler performance under pressure. Higher pressures are used only for special, non-typical systems, while the other pressure values fall outside the standard range used for most installations.

Standpipe and sprinkler systems are designed around a maximum listed pressure to keep every component—piping, valves, hose connections, and sprinkler heads—within what the equipment is tested and listed to handle. For most of these systems, that maximum listed pressure is 175 psi, reflecting common UL/FM listings and NFPA design practice. Staying at or below this limit ensures reliable operation and reduces the risk of component failure, leaks, or impaired sprinkler performance under pressure. Higher pressures are used only for special, non-typical systems, while the other pressure values fall outside the standard range used for most installations.