Drainage, Waste, and Venting Flashcards
7 cards from real Journeyman Plumbers Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Drainage, Waste, and Venting flashcards as text
An air admittance valve (AAV) may NOT be used as the sole means of venting in which location?
Answer: As the vent for a building sewer
AAVs cannot be used to vent a building sewer because they are one-way devices and do not allow sewer gases to escape to atmosphere.
Which pipe material is NOT approved for use in above-ground DWV systems under the UPC?
Answer: Galvanized steel drain pipe
Galvanized steel is not listed for DWV use because it corrodes internally from waste gases and restricts flow over time.
What is the purpose of a relief vent in a tall building stack?
Answer: To relieve positive pressure at the base of the stack
A relief vent connects the soil stack to the vent stack near the base to relieve the positive pressure that builds at the bottom of a tall stack.
When two or more water closets are on the same horizontal branch, which venting method is most efficient?
Answer: Using a circuit vent with a relief vent
A circuit vent with a relief vent efficiently serves a battery of water closets on the same horizontal branch, reducing pipe runs.
What is the minimum vent pipe size for a water closet?
Answer: 2 inches
The minimum vent pipe size for a water closet is 2 inches per most plumbing codes, including the UPC.
How far above the flood level rim of a fixture must a vent pipe rise before offsetting horizontally?
Answer: 6 inches
A vent pipe must rise at least 6 inches above the flood level rim of the highest served fixture before making a horizontal offset.
A combination waste and vent system is typically permitted for which type of fixture?
Answer: Floor drains and floor sinks
Combination waste and vent systems are commonly permitted for floor drains and floor sinks in commercial settings where wet venting is impractical.