Which practice supports maintaining system integrity under fire conditions as per NFPA 20?

• A. Proper interface with water supply and appropriate piping design.
• B. Disconnecting the pump from power during operation.
• C. Omitting pressure relief devices.
• D. Using flexible hoses for all connections.

Answer: (A)

Maintaining system integrity under fire conditions starts with a solid connection to the water supply and piping that supports reliable pump operation. When the pump has a proper interface with the water source and the suction and discharge piping is designed correctly, the system keeps prime, maintains adequate suction pressure, and minimizes air entrainment and flow restrictions. This means the pump can deliver the needed water flow and pressure when demand spikes during a fire, and it helps prevent issues like cavitation, air pockets, or pressure fluctuations that could compromise performance.

Disrupting power during operation would prevent the pump from delivering water, which defeats the purpose of the fire protection system. Leaving out pressure relief devices removes a critical safety feature and protection against overpressure. Using flexible hoses for all connections can introduce excessive movement, vibration, and potential leaks, reducing reliability in a high-demand, critical scenario.