What is the maximum allowable psi leakage during a 24 hour air test?

The maximum allowable psi leakage during a 24-hour air test is 1.5 psi. This standard establishes limits to ensure the integrity of the system being tested. When conducting an air test, it is crucial to minimize leakage to confirm that the piping and system components are sealed properly. If leakage is excessive, it may indicate potential issues such as cracks, loose fittings, or other defects that require remediation before the system can be safely utilized.

The 1.5 psi threshold allows for a slight margin of leakage while still ensuring that the system can perform effectively under operational conditions. Meeting this standard helps prevent future failures that might arise from undetected leaks, which could lead to property damage or operational issues.

Standards for air testing, including the specified psi limits, are typically outlined in codes and regulations such as the National Fire Protection Association (NFPA) standards, which serve to guide best practices in fire protection installation and maintenance. Adhering to these limits is fundamental for ensuring safety and compliance within the sprinkler fitting profession.