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
Under the IPC, what is the maximum developed length of a 1.5-inch trap arm (from trap weir to vent)?
Answer: 3.5 feet
The IPC limits the trap arm of a 1.5-inch pipe to a maximum developed length of 3.5 feet from the trap weir to the vent.
When two fixtures are on opposite sides of a wall and share a common vertical drain, the configuration is called a:
Answer: Common vent arrangement
A common vent arrangement allows two fixtures at the same floor level on opposite sides of a partition to share a single vent pipe.
Which of the following is an example of a self-siphoning trap condition?
Answer: A lavatory trap losing its seal during the fixture's own rapid drainage
Self-siphonage occurs when a fixture's own rapid discharge creates enough negative pressure to pull the water seal from its own trap.
What is the minimum vent pipe diameter for a single water closet?
Answer: 2 inches
The IPC requires a minimum 2-inch vent for a water closet because of the high volume of waste and the 4-inch drain size associated with water closets.
A sewage ejector system is required when a fixture drain is located:
Answer: Below the upstream manhole cover elevation of the public sewer
A sewage ejector is required when fixtures are below the upstream manhole cover elevation of the public sewer so that waste can be pumped up to the gravity sewer.
What is the maximum unvented length (developed length) of a drain pipe serving a 3-inch trap arm under the IPC?
Answer: 6 feet
The IPC allows a maximum trap arm developed length of 6 feet for a 3-inch diameter trap arm from the trap weir to the vent.
Under the IPC, where must the cleanout at the base of a soil stack be located?
Answer: Within 10 feet of the base of the stack in the horizontal drain
The IPC requires a cleanout within 10 feet of the base of each soil and waste stack in the horizontal drain to allow rodding of the stack from the bottom.