What is the duration and testing air pressure for the air test in a dry standpipe system?

In a dry standpipe system, the air test is conducted to ensure the integrity of the piping and verify that there are no leaks present. The standard duration for this test is 24 hours, during which the system is subjected to a testing air pressure of 40 psi.

This testing period allows sufficient time for any potential leaks to become apparent, as they may not manifest immediately. The pressure level of 40 psi is determined to be adequate for testing the system without risking damage to the piping or system components; it applies enough force to detect subtle leaks that might otherwise go unnoticed at lower pressures. Proper adherence to these standards is crucial for maintaining the functionality and reliability of the standpipe system in emergency situations.