CSLB C-36 Plumbing ContractorRough-in PlumbingHard
A plumbing contractor is performing a final inspection of a newly installed residential gas piping system. The system includes a sediment trap (drip leg) installed on the branch line serving a water heater. Where should this sediment trap be located relative to the equipment shut-off valve and the appliance inlet?
- ABefore the equipment shut-off valve, but after the appliance inlet.
- BAnywhere on the branch line, as long as it's accessible.
- CImmediately at the appliance inlet, before any other components.
- DAfter the equipment shut-off valve, but before the appliance inlet.
Show answer & explanationAnswer & explanation
Correct answer: D. After the equipment shut-off valve, but before the appliance inlet.
Sediment traps (drip legs) are crucial for protecting gas appliances from debris. The California Plumbing Code mandates their installation after the equipment shut-off valve and before the appliance inlet, ensuring that the sediment trap is isolated when the valve is closed for servicing and that it effectively captures debris before it reaches the appliance.
Why the other options are wrong
- A. Placing it after the appliance inlet defeats its purpose of protecting the appliance.
- B. Location is critical, not just accessibility; it must be in the correct sequence relative to other components.
- C. While close to the inlet, it must be after the shut-off valve for serviceability.
Gas Sediment Trap Location
The specific placement of a sediment trap (drip leg) on a gas appliance branch line, ensuring it protects the appliance and is serviceable.
- Protects appliance from dirt, rust, and moisture.
- Must be installed after the shut-off valve.
- Must be installed before the appliance's flexible connector or inlet.
Memory trick: Valves Trap Fire First.