What is the stated purpose of pressure-relief devices installed in a standpipe according to NFPA 20?

What is the stated purpose of pressure-relief devices installed in a standpipe according to NFPA 20?

• A. To regulate flow rate
• B. To prevent backflow
• C. To reduce noise
• D. To protect the standpipe from over-pressurization

Answer: (D)

The main idea is to protect the standpipe from over-pressurization. Pressure-relief devices are provided so that if pump operation or valve configurations cause the system pressure to rise above its design limit, the device opens and vents enough fluid to keep the pressure in check. This prevents damage to the standpipe, hose connections, fittings, and related piping, and helps avoid failures from excessive pressure during firefighting operations or hydraulic transients. They are not intended to regulate flow, prevent backflow, or reduce noise; their job is specifically to cap the pressure so the system stays safe and intact.

The main idea is to protect the standpipe from over-pressurization. Pressure-relief devices are provided so that if pump operation or valve configurations cause the system pressure to rise above its design limit, the device opens and vents enough fluid to keep the pressure in check. This prevents damage to the standpipe, hose connections, fittings, and related piping, and helps avoid failures from excessive pressure during firefighting operations or hydraulic transients. They are not intended to regulate flow, prevent backflow, or reduce noise; their job is specifically to cap the pressure so the system stays safe and intact.