Journeyman Plumber ExamPlumbing Code and RegulationsHard
A journeyman plumber is installing a commercial kitchen three-compartment sink. According to the Uniform Plumbing Code (UPC), what is the minimum nominal pipe size for the indirect waste receptor serving this sink?
- A4 inches
- B1 1/2 inches
- C2 inches
- D3 inches
Show answer & explanationAnswer & explanation
Correct answer: D. 3 inches
For a commercial kitchen three-compartment sink, which generates a significant volume of waste, the UPC requires a minimum 3-inch nominal pipe size for the indirect waste receptor. This ensures adequate drainage capacity to prevent overflow and maintain sanitation.
Why the other options are wrong
- A. 4 inches would be acceptable but is larger than the minimum required, potentially adding unnecessary cost and space.
- B. 1 1/2 inches is too small for a commercial three-compartment sink's indirect waste receptor and would likely lead to overflow.
- C. 2 inches is insufficient for the volume of waste from a commercial three-compartment sink.
Commercial Sink Indirect Waste Receptor Size
The minimum diameter of the pipe or funnel that receives indirect waste from commercial fixtures like a three-compartment sink.
- Prevents direct cross-connection.
- Sized for fixture's discharge capacity.
- Critical for commercial sanitation.
Memory trick: Indirect waste flow, for big sinks you know, at least three inches, let the waters go.