Can you explain the process of pressure testing gas lines using nitrogen or other methods?

Sample interview questions: Can you explain the process of pressure testing gas lines using nitrogen or other methods?

Sample answer:

Pressure Testing Gas Lines

Nitrogen Method

1. Isolating the Gas Line: Shut off the gas supply and disconnect the affected line.
2. Purging the Line: Use an inert gas, typically nitrogen, to purge the line of any residual gas or air. This is achieved by flowing nitrogen through the line at a low pressure for several minutes.
3. Pressurizing the Line: Connect a pressure gauge and nitrogen regulator to the line. Gradually increase the nitrogen pressure until it reaches the test pressure specified by code or industry standards.
4. Holding the Pressure: Maintain the test pressure for a predetermined period, typically 60 minutes. Monitor the pressure gauge for any significant drops, which may indicate leaks.
5. Releasing the Pressure: Slowly release the nitrogen pressure through a controlled vent.
6. Inspecting the Line: Visually inspect the line for any signs of leakage or damage that may have occurred during testing.

Alternative Methods Read full answer