The Last 111 Test: DWV Systems Flashcards
Sanitary drainage systems can be divided into three parts: the pipes buried inside the building, the drain pipe outside the building and the…
Public Sewer
Who is usually responsible for installing and maintaining the public sewers, lift stations, and treatment plants?
Municipality
What is the circuit of piping inside a building to remove the wastes from plumbing fixtures and drains safely, reliably and efficiently?
DWV System
What do many fixtures have to strain the wastewater before it enters the drainage piping?
Drains
What in a trap protects people from airborne pathogens (germs), foul odors, and potentially explosive sewer gases?
Water Seal
A fixture trap must be self cleaning, have a smooth interior waterway, be accessible for cleanout and…
Flush Completely
What fixture should never be attached to another trap because of double trapping?
Water Closets
Siphonage occurs when there is…
negative pressure inside the DWV piping
A properly sized trap will prevent ______ from breaking the trap seal.
Back Pressure
What balances the pressure within the drainage system to maintain the water seals in fixture traps?
Vents
What do vents use to maintain equalized pressure throughout the drainage system?
Air
Tables based on fall and pipe diameter give the maximum ______ allowed between the crown weir and the vent.
Distances
If the total drop between the crown weir and the fixture vent exceeds one pipe diameter , the trap is likely to…
Siphon
Plumbers must size the vents correctly according to how many _____ are connected, the number of drainage fixture units, and the length of the vent pipe.
Fixtures
What are the most commonly used materials for DWV fittings?
Cast Iron & Plastic
True or False: Fittings of the same design will have the same name unless they are made of different materials.
False
Sanitary drainage fittings are made with a ______ design to allow for the smooth flow of material in the system.
Sweeping
The direction of hub type fittings should flow from the _______ of the pipe.
bell to the spigot end
If the branch inlets of sanitary fittings are ______, they can be joined to the DWV system without reducers.
Reducing
A 1/4 bend turns ____ of a complete circle.
90 degrees
Different materials of piping in a DWV System can be joined together using a(n)
Adapter
What fitting has internal threads on the branch fitting to accept a threaded plug?
Cleanout
For branches that run horizontal to vertical use a(n)
Sanitary Tee
What fitting is used to enlarge the diameter of vent stacks?
Sanitary Increaser
What do drainage and waste systems depend on to move solid and liquid waste through the pipes?
Gravity
What is the main horizontal drain pipe located inside a building called?
Building Drain
Fittings that work as removable plugs used to provide access to the inside of DWV piping are called…
Cleanouts
What is the drainage piping that goes from the buildings foundation to the sewer main or septic tank(private waste disposal system)?
Building Sewer
What settles out of the water in a septic tank?
Sludge
True or False: Plumbing codes do not vary among jurisdictions.
False
