What should be the minimum diameter of a fire pump pressure gauge?

The minimum diameter of a fire pump pressure gauge should be 3.5 inches. This size is specified in various codes and standards to ensure accurate readings, as well as to improve visibility and ease of monitoring in emergency situations. A gauge that is too small may be difficult to read, especially under high pressure conditions or from a distance. The 3.5-inch size strikes a balance between portability and functionality, making it practical for installation in various settings while still providing clear and reliable measurements of the pressure.

Choosing a gauge with a diameter smaller than 3.5 inches could lead to insufficient clarity in readings, which would be a critical issue in emergency situations where accurate pressure information is vital for safety and operational effectiveness.