What is the maximum acceptable pressure drop in a dry pipe system during an air or nitrogen pressure test?

The maximum acceptable pressure drop in a dry pipe system during an air or nitrogen pressure test is 3 psi. This standard is set to ensure that the integrity of the system is maintained, and it helps to identify any potential leaks or weaknesses in the piping. During the pressure test, maintaining a maximum drop of 3 psi allows technicians to confirm that the system is capable of holding pressure without significant loss, which reflects the system's reliability and effectiveness in a real-world fire protection scenario. This value is critical in evaluating safety and operational functionality, ensuring that the dry pipe system performs adequately under expected conditions.