Title: (Optional) Describe testing and purging procedures.
Course: Plumbing II (17058-II) > Section: Installing Natural Gas Piping Systems

Description of testing should include

- explaining when and why the test should be conducted (after rough-in)
- explaining why a soap and water solution is applied to joints (bubbles will indicate a leak)
- understanding when and how to use a manometer
- referring to local and state gas codes for specific testing requirements.

Description of purging should include

- explaining when and why the purge should be conducted (after the test)
- understanding ventilation requirements
- disconnecting the gas pipe from the appliance
- conducting the purge according to local and state gas codes.

Process/Skill Questions:

- Why should the test occur after rough-in but before the building is completed?
- What are some safety precautions that are important when installing appliances?
- How often should plumbers test piping installations?