Journeyman Plumber ExamGas PipingEasy
A plumber is installing a new natural gas line in a residential home. According to most plumbing codes, what is the minimum working pressure at which the gas piping system must be tested?
- A10 psig
- B0.5 psig
- C6 inches of water column
- D3 inches of water column
Show answer & explanationAnswer & explanation
Correct answer: A. 10 psig
Most plumbing codes require gas piping systems to be tested at a minimum working pressure of 10 psig for a specified duration to ensure no leaks are present.
Why the other options are wrong
- B. This is a very low pressure, often a maximum operating pressure, not a test pressure.
- C. This is sometimes a test pressure for low-pressure systems, but 10 psig is a more common minimum for general residential testing.
- D. This is typically the minimum operating pressure for appliances, not the test pressure.
Gas Piping Test Pressure
The minimum pressure at which a newly installed or modified gas piping system must be tested to verify its integrity and detect leaks before being put into service.
- Typically 10 psig for residential systems.
- Test duration is usually 10-15 minutes.
- Pressure must remain constant during the test.
Memory trick: Gas pipes must be TIGHT, so TEST them RIGHT!