CSLB C-36 Plumbing ContractorRough-in PlumbingMedium
A plumbing inspector is reviewing a rough-in installation for a new gas piping system in a commercial kitchen. The inspector observes that the gas piping is run through a concrete slab. What specific protection is required for gas piping installed within a concrete slab?
- ANo special protection is required if the pipe is Schedule 40 steel.
- BThe pipe must be painted with a corrosion-resistant coating.
- CThe pipe must be wrapped with approved electrical tape.
- DThe pipe must be encased in a continuous sleeve or conduit.
Show answer & explanationAnswer & explanation
Correct answer: D. The pipe must be encased in a continuous sleeve or conduit.
Gas piping installed in or under a concrete slab must be protected from corrosion and damage. The California Plumbing Code (CPC) mandates that such piping be encased in a continuous, approved sleeve or conduit that extends through the slab and is sealed at the ends to prevent water or concrete from contacting the pipe.
Why the other options are wrong
- A. Even Schedule 40 steel pipe requires protection when embedded in concrete due to potential corrosion from the concrete and moisture.
- B. While corrosion resistance is good, painting alone is not sufficient protection for gas piping within a slab.
- C. Electrical tape is not an approved method for protecting gas piping within a concrete slab.
Gas Pipe Slab Protection
Measures required to protect gas piping when it is installed within or under concrete slabs from corrosion, physical damage, and leaks.
- Prevents corrosion from concrete.
- Protects against damage from slab movement.
- Typically involves sleeving or conduit.
Memory trick: Slab Gas needs a Sleeve: Safe, Sealed, Secured.