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 trap seal depth required by the IPC for fixture traps?
Answer: 2 inches
The IPC requires a minimum trap seal depth of 2 inches to prevent sewer gases from entering the building through the fixture drain.
A stack vent differs from a vent stack in that a stack vent:
Answer: Is an extension of the drain stack above the highest branch connection
A stack vent is the upper portion of the soil or waste stack that extends above the highest horizontal branch and serves as the vent terminal.
What is the term for the pressure condition created by rapid water flow past a branch connection that can siphon a trap?
Answer: Induced siphonage
Induced siphonage occurs when waste flowing down a stack creates negative pressure at a nearby branch connection, pulling water out of adjacent fixture traps.
Under the IPC, what is the maximum height of a horizontal offset in a drainage stack that requires a relief vent?
Answer: More than 5 stories above the offset
The IPC requires a relief vent when a horizontal offset in a drainage stack has more than 5 stories of drainage stack above it.
A grease interceptor is required to have a vented inlet. What is the reason for this requirement?
Answer: To prevent siphoning of the trap seal and allow gas escape
Venting the inlet of a grease interceptor prevents the trap seal from being siphoned and allows gases produced by decomposing grease to escape safely.
What is the minimum size of a cleanout required on a building drain 4 inches in diameter?
Answer: 4 inches
The IPC requires that a cleanout on a pipe 4 inches or less in diameter must be the same size as the pipe, so a 4-inch drain requires a 4-inch cleanout.
Island fixture venting is a special venting method most commonly used for:
Answer: Sinks installed in kitchen islands away from walls
Island venting routes the vent pipe down below the floor and back up to connect to the vent system, allowing sinks in islands without wall access to be properly vented.