DWV and Storm Drainage 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 DWV and Storm Drainage flashcards as text
What is the maximum trap-to-vent distance for a 3-inch trap arm under the IPC?
Answer: 10 feet
Per IPC Table 909.1, a 3-inch trap arm may extend a maximum of 10 feet from the trap to the vent.
In a DWV system, which stack is used exclusively for venting and carries no waste?
Answer: Vent stack
A vent stack is a vertical pipe used solely for venting purposes; it carries no sewage or waste water.
When is an 'island fixture vent' (Chicago loop) used?
Answer: When a fixture cannot be vented through the roof due to its location in a kitchen island
An island fixture vent loops up from the drain and back down, then runs beneath the floor to connect to a vent stack, used when fixtures are in islands away from walls.
What is the minimum depth of cover required for a building sewer installed under a driveway?
Answer: 18 inches
The IPC requires a minimum of 18 inches of cover for a building sewer installed under a driveway subject to vehicular traffic.
A 'circuit vent' in a DWV system serves which purpose?
Answer: It vents a battery of fixtures connected to a horizontal branch with a single vent at the end
A circuit vent serves a group (battery) of fixtures on a common horizontal branch by venting the branch with a single vent connection at its upstream end.
Which of the following describes a 'flat' or 'grade' issue in horizontal drain piping?
Answer: Pipe installed at less than the minimum required slope, causing solids to settle
A flat or insufficient grade means the pipe has less than the minimum slope, causing flow velocity to drop below self-scouring speed and allowing solids to settle and block the pipe.
What is the rational method formula (Q = CIA) used for in storm drainage?
Answer: Estimating peak storm water runoff from a drainage area
The rational method (Q = CIA) is used to estimate peak runoff where Q is flow, C is the runoff coefficient, I is rainfall intensity, and A is drainage area.