Trade Exam · Module 3
Fuel Gas Piping
Know natural gas rises and propane sinks. Sediment traps before every appliance, black steel piping indoors, PE underground only. Test at 3 psi with soapy water, never flame.
Key Takeaways
Why This Matters on the Exam
Here's the deal—fuel gas piping is your make-or-break exam topic. About 10-12% of the C-36 is gas, and you cannot guess on this. I've seen guys fail entirely because they didn't nail the sediment trap questions. Gas leaks kill people. Carbon monoxide kills people. A missed trap or bad venting costs someone their life. This is serious stuff, and the exam reflects that.
What You Must Know
Fuel gas systems are their own beast—totally separate from water and DWV. You're liable under the California plumbing code, not the electricians or HVAC guys. Licensed plumbers handle natural gas. Propane? That's a different world—you often need extra certs, and it's tested less, so focus on natural gas. Every gas system gets tested before occupancy. Period. No exceptions, no shortcuts.
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More lessons in Underground and Rough Systems
- 1Underground Piping Fundamentals
- 2DWV Rough-In
- 3Water Supply Rough-In
- 4Fuel Gas PipingYou are here
- 5Venting
- 6Testing and Inspection