During a 5-year hydrostatic test, what is the acceptable pressure loss?

In the context of a hydrostatic test for water-based fire protection systems, the acceptable pressure loss is a crucial parameter to ensure the integrity and functionality of the system over time. During these tests, the system is filled with water and pressurized to a specified level to check for leaks or structural weaknesses.

The acceptable pressure loss allows for minor fluctuations due to temperature changes or minor mistakes in pressure measurement. A loss of pressure up to 5 PSI is considered acceptable, as it indicates that the system is likely still in sound condition while allowing for minor variations.

A loss beyond this range could suggest potential issues, such as leaks or significant weaknesses in the piping or components, which would require further inspection or repairs to ensure safety and reliability. Therefore, maintaining a standard of a maximum pressure loss of 5 PSI during a 5-year hydrostatic test reflects industry standards and best practices for the maintenance of fire protection systems.