Drainage, Waste, and Venting Flashcards
7 cards from real Master Plumber 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
What is the minimum slope required for a 3-inch horizontal drain pipe under the IPC?
Answer: 1/8 inch per foot
The IPC requires a minimum slope of 1/8 inch per foot for 3-inch horizontal drain pipes to ensure proper flow.
Which type of vent serves as both a vent for a trap and the drain for a fixture?
Answer: Wet vent
A wet vent simultaneously carries waste water from one fixture and provides the vent for another fixture's trap.
Under the IPC, what is the maximum distance a P-trap for a lavatory can be from its vent?
Answer: 4 feet
The IPC allows a maximum developed length of 4 feet between a lavatory trap and its vent connection.
A building drain that transitions to a building sewer must maintain the same slope unless:
Answer: The sewer pipe is larger in diameter
When the building sewer pipe is larger than the building drain, a change in slope is permissible at the transition point.
Which fitting is prohibited for use in a horizontal-to-vertical drain change of direction?
Answer: Sanitary tee used on its side
A sanitary tee used on its side (horizontal flow) is prohibited because its design creates turbulence and restricts drainage flow.
What is the primary purpose of a relief vent in a drainage system?
Answer: To equalize pressure between the vent stack and drain stack
A relief vent provides a pressure-equalizing connection between the drain stack and the vent stack to prevent pressure buildup.
Under the IPC, air admittance valves (AAVs) are NOT permitted to be used as the sole vent for:
Answer: Sumps and ejectors
AAVs cannot be used as the sole vent for sumps and ejectors because these systems require outdoor venting to release sewer gases from the pit.