What is the minimum size pipe allowed for a sensing line on a fire pump to the controller?

The minimum size pipe allowed for a sensing line on a fire pump to the controller is 1/2 inch. This size is specified to ensure adequate flow and pressure for the system to function correctly, allowing the fire pump controller to receive reliable signals regarding system pressure and activation needs. The use of a 1/2-inch diameter pipe helps prevent issues such as blockages or pressure drops that could occur with smaller diameters, which could compromise the pump's response time in an emergency situation. Smaller pipe sizes may not provide the necessary performance levels, especially when rapid and efficient operation is critical for fire suppression systems.