What is the maximum acceptable pressure loss during a pressure test in a dry pipe system?

The maximum acceptable pressure loss during a pressure test in a dry pipe system is 3 psi. This standard is established to ensure the integrity of the fire protection system, including its ability to maintain sufficient pressure during operation. A loss greater than this threshold could indicate a potential leak or failure in the system components, which could compromise the system's effectiveness in the event of a fire.

Setting the limit at 3 psi strikes a balance between ensuring system reliability and allowing for minor variations that could occur due to temperature changes or minor imperfections in seals and joints. Conducting tests within this acceptable range helps to ascertain that the system is leak-free and capable of functioning as intended when needed. Testing results below this maximum pressure loss provide confidence in the system's readiness and compliance with safety regulations.