Sanitary Drainage Systems Flashcards
7 cards from real CPD practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Sanitary Drainage Systems flashcards as text
A stack serving more than 10 branch intervals must be provided with a:
Answer: Yoke vent at every fifth interval
The IPC requires yoke vents (relief vents) at every fifth interval when a drainage stack serves more than 10 branch intervals to relieve pressure fluctuations.
Which material is generally NOT approved for underground sanitary drain piping inside a building per the IPC?
Answer: Threaded galvanized steel
Threaded galvanized steel is not approved for underground sanitary drainage because it corrodes rapidly when buried and exposed to wastewater.
In sanitary drainage design, what is a 'branch interval'?
Answer: A vertical measurement of at least 8 feet along a drainage stack
A branch interval is a vertical measurement of not less than 8 feet within a stack, representing the space between horizontal branch connections.
Which of the following scenarios requires an indirect waste connection rather than a direct drain connection?
Answer: A commercial dishwasher in a restaurant kitchen
Commercial dishwashers must discharge through an indirect waste connection with an air gap to prevent contamination of the potable or sanitary system by backflow.
When a sanitary drain must pass under a footing, the minimum clearance between the top of the pipe and the bottom of the footing is:
Answer: No clearance required if pipe is in a sleeve
When a pipe passes under a footing, IPC allows it if properly sleeved or protected such that the footing load is not transferred to the pipe.
What is the maximum distance a trap arm may extend horizontally from the trap weir to the vent for a 2-inch drain?
Answer: 6 feet
Per IPC Table 909.1, a 2-inch trap arm has a maximum developed length of 6 feet from the trap weir to the vent.
Which venting method uses a fitting designed with an internal air-admittance mechanism to vent individual fixtures?
Answer: Air admittance valve (AAV)
An air admittance valve (AAV) is a mechanical vent device that opens under negative pressure to admit air and closes to prevent sewer gas escape.