What is the normal maximum air pressure in a dry pipe sprinkler system?

The normal maximum air pressure in a dry pipe sprinkler system is indeed around 275 kPa (40 psi). This specific pressure ensures that the system remains in a state where it can effectively operate without risk of unnecessary activation of the sprinkler heads.

In a dry pipe system, air pressure is maintained to keep the water in the pipes from entering until a fire triggers the system. If the air pressure were to exceed 275 kPa, it could lead to complications, potentially affecting the balance required for the system to function properly. This pressure threshold is designed to balance safety and functionality, making it crucial for the system's reliable operation.

Other pressure levels, whether higher or lower, do not align with the operational standards set for dry pipe systems, ensuring that 275 kPa represents the optimal figure for maintaining system integrity while allowing for efficient performance in the detection and response to fire conditions.