Journeyman Plumber ExamDrainage, Waste, and Venting (DWV) SystemsEasy
A plumber is installing a floor drain in a commercial kitchen. The drain is subject to heavy grease discharge. What type of interceptor is required to prevent grease from entering the building's drainage system?
- ALint interceptor
- BSand interceptor
- COil separator
- DGrease interceptor
Show answer & explanationAnswer & explanation
Correct answer: D. Grease interceptor
Commercial kitchens are known for producing significant amounts of grease. A grease interceptor is specifically designed to separate and retain fats, oils, and greases (FOG) from wastewater before it enters the public sewer system.
Why the other options are wrong
- A. Lint interceptors are used for laundries or places with fibrous waste, not grease.
- B. Sand interceptors are used for situations where sand or other heavy solids are present, such as car washes or garages.
- C. Oil separators are used for petroleum-based oils, typically in automotive or industrial settings, not cooking grease.
Grease Interceptor
A plumbing device designed to intercept and retain fats, oils, and greases (FOG) from wastewater before they enter a sanitary sewer system, preventing blockages and environmental contamination.
- Required for commercial kitchens.
- Separates FOG by buoyancy.
- Must be regularly cleaned.
- Protects public sewer lines.
Memory trick: Interceptors Catch Specific Waste, Keeping Drains from a Nasty State.