What test condition is specified to prove tightness for public corridor piping?

What test condition is specified to prove tightness for public corridor piping?

• A. 10 psig for 30 minutes
• B. 5 psig for 15 minutes
• C. 15 psig for 60 minutes
• D. 20 psig for 20 minutes

Answer: (A)

Tightness testing of public corridor gas piping is done by pressurizing the system to a specified test pressure and holding it long enough to reveal leaks. The chosen condition must balance detecting even slow leaks with not over-stressing the piping. For public corridor piping, the established test condition is to raise the piping to 10 psig and maintain that pressure for 30 minutes. This pressure is high enough to uncover small leaks, while the 30-minute duration provides a meaningful window to see any pressure drop that would indicate a leak. Before performing the test, isolate the gas supply and close all appliance valves, then pressurize the piping and check for leaks using a soap solution or an appropriate detector. If the pressure remains steady throughout the 30 minutes with no indication of leaks, the piping passes the tightness test and can be brought into service after proper depressurization and purging. The other options either use too little or too much pressure or shorten/extend the test duration beyond what the code specifies, reducing the test’s effectiveness or risking damage to components.

Tightness testing of public corridor gas piping is done by pressurizing the system to a specified test pressure and holding it long enough to reveal leaks. The chosen condition must balance detecting even slow leaks with not over-stressing the piping. For public corridor piping, the established test condition is to raise the piping to 10 psig and maintain that pressure for 30 minutes. This pressure is high enough to uncover small leaks, while the 30-minute duration provides a meaningful window to see any pressure drop that would indicate a leak.

Before performing the test, isolate the gas supply and close all appliance valves, then pressurize the piping and check for leaks using a soap solution or an appropriate detector. If the pressure remains steady throughout the 30 minutes with no indication of leaks, the piping passes the tightness test and can be brought into service after proper depressurization and purging.

The other options either use too little or too much pressure or shorten/extend the test duration beyond what the code specifies, reducing the test’s effectiveness or risking damage to components.