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
When testing a DWV system with water, to what height must the water column be maintained above the highest point of the system?
Answer: 10 feet
A water test requires the system to be filled to a 10-foot head of water above the highest point being tested, per the UPC.
What is a 'P-trap'?
Answer: A fixture trap with a water seal that prevents sewer gas entry
A P-trap is the standard fixture trap that maintains a water seal to prevent sewer gases from entering the building through fixture drains.
A soil pipe carries which type of waste?
Answer: Human waste and urine from water closets and urinals
A soil pipe is defined as a pipe that conveys the discharge of water closets and urinals, with or without other waste.
What is the minimum size of a building sewer that receives discharge from a water closet?
Answer: 4 inches
The minimum building sewer size that receives water closet discharge is 4 inches per the UPC.
Which venting arrangement is used when a vent pipe must be routed under a slab before it can rise to open air?
Answer: An engineered vent system approved by the AHJ
When a vent must pass under a slab, an engineered vent system specifically approved by the authority having jurisdiction (AHJ) is required.
What is the purpose of a cleanout installed at the base of a soil stack?
Answer: To allow rodding and clearing of the building drain and stack
A cleanout at the base of a soil stack provides access for drain-cleaning equipment to clear blockages in the stack and building drain.
When a vent pipe passes through a roof, what is the minimum height it must extend above the roof surface in a climate with heavy snowfall?
Answer: At least 12 inches and checked against local frost/snow depth requirements
In heavy snowfall areas, vent pipes must extend at least 12 inches above the roof and may need to be higher per local codes to prevent snow from blocking the vent opening.