Journeyman Plumber ExamWater Supply SystemsMedium
A plumber is inspecting a backflow prevention assembly (e.g., an RPZ or DCVA) that has been installed for several years. What is the most critical maintenance requirement for these devices to ensure their continued effectiveness?
- AAnnual testing by a certified backflow prevention assembly tester.
- BRegular flushing of sediments through drain ports.
- CAnnual painting of the exterior casing.
- DReplacing all internal components every five years.
Show answer & explanationAnswer & explanation
Correct answer: A. Annual testing by a certified backflow prevention assembly tester.
Backflow prevention assemblies are mechanical devices that can fail over time. To ensure they are functioning correctly and providing the required protection against contamination, they must be tested annually (or as per local code) by a certified backflow prevention assembly tester. This is a critical code requirement.
Why the other options are wrong
- B. Regular flushing can help, but it does not verify the proper operation of the internal check valves and relief valve as a certified test does.
- C. Painting is aesthetic and protective against corrosion, but not critical for the internal function of backflow prevention.
- D. Replacing all internal components every five years is not a standard requirement; components are replaced only if they fail during testing or inspection.
Backflow Assembly Testing
The mandatory, periodic inspection and functional testing of backflow prevention assemblies by a certified professional to ensure they are operating correctly and protecting the potable water supply.
- Required by code (e.g., annually).
- Must be performed by a certified tester.
- Verifies proper function of check valves and relief valve.
Memory trick: Backflow needs a yearly check, by a certified pro, to keep it on track.