3rd year-Plumbing Final Exam (Study guide)
Define an air admittance Valve one way valve designed to allow air to enter the drainage system when the
pressure in the plumbing system is less than the atmospheric pressure
Define a Branch Vent a vent pipe that is connected at it its lower end to the junction of 2 or more vent
pipes, and at its upper end, either to another branch vent or to a stack vent,
vent stack or vent header, or terminates in open air
Define a Continuous Vent means a vent pipe that is an extension of a vertical section of a branch, or
fixture drain
Define a Dual Vent a vent pipe that serves 2 fixtures and connects at the junction of the trap arms.
Define a stack vent means a vent pipe that connects the top of a soil or waste stack to a vent
header or to outside air
Define a Wet Vent means a soil or waste pipe that also serves as a vent pipe that also serves as a
vent pipe and extends from the most downstream wet-vented fixture connection
to the most upstream fixture connection
List 5 factors to consider when selecting a floor drain for a -The volume of liquid to be drained
particular area -The type of traffic expected in the area
-The type of waste that will pass through the drain
-Optimal accessories where required
-The appearance of a strainer or grate
What is the minimum size of outlet on a floor drain? 2''
What is the minimum length of a trap arm for a 3'' Floor 450mm
drain
, What is the minimum size vent for a 2'' Floor drain 1 1/2''
Define Vent header A vent pipe that connects any combination of stack vents or vent stacks to outside
air
When should Island vents be used? When fixtures cannot be vented in the conventional manner
What are Vent stacks used for? To limit pressure differentials in the soil stack on a multi-storey building
Where must a vent stack connect? at- or below the fixtures on the lowest soil or waste branch
What's the minimum size of a vent stack? It shall not be less than one half the size of the soil or waste stack at the base
When are Yoke Vents Required? only required on buildings that are more than 11 storey's in height
How many fixture units are allowed to connect to a vent 8
stack?
How high must a building be before a vent stack is More than 4 storey's, that have plumbing fixtures connected.
required?
Where are yoke vents connected on the stack in a Yoke vents are connected for each section of five stories or part therof on which
building with fixtures on more than 11 storeys? fixtures are located, counting from the top down, and at or immediately above
each offset or double offset.
How is a Bathroom group sized when tied into the vent As a wet vent
stack?
Fixtures must be Certified
Minimum supply pipe for tank type W.C is 3/8''
What 2 things must Jetted Tubs have? an acess Panel
-a GFI
Name 3 major vents in a plumbing system Vent
header
Vent Stack
Stack Vent
What is the minimum size of Roof increaser 1 1/4'' x 3inches
What 3 things must a sump have when being connected -Union
to a building drain? -Check valve
-Gate or ball Valve
What is the reason why a check valve is required on a Sanitary drainage
sump connecting to a building drain
What does Subsoil drainage refer to? pipes that are installed underground to intercept and convey groundwater.
Define an air admittance Valve one way valve designed to allow air to enter the drainage system when the
pressure in the plumbing system is less than the atmospheric pressure
Define a Branch Vent a vent pipe that is connected at it its lower end to the junction of 2 or more vent
pipes, and at its upper end, either to another branch vent or to a stack vent,
vent stack or vent header, or terminates in open air
Define a Continuous Vent means a vent pipe that is an extension of a vertical section of a branch, or
fixture drain
Define a Dual Vent a vent pipe that serves 2 fixtures and connects at the junction of the trap arms.
Define a stack vent means a vent pipe that connects the top of a soil or waste stack to a vent
header or to outside air
Define a Wet Vent means a soil or waste pipe that also serves as a vent pipe that also serves as a
vent pipe and extends from the most downstream wet-vented fixture connection
to the most upstream fixture connection
List 5 factors to consider when selecting a floor drain for a -The volume of liquid to be drained
particular area -The type of traffic expected in the area
-The type of waste that will pass through the drain
-Optimal accessories where required
-The appearance of a strainer or grate
What is the minimum size of outlet on a floor drain? 2''
What is the minimum length of a trap arm for a 3'' Floor 450mm
drain
, What is the minimum size vent for a 2'' Floor drain 1 1/2''
Define Vent header A vent pipe that connects any combination of stack vents or vent stacks to outside
air
When should Island vents be used? When fixtures cannot be vented in the conventional manner
What are Vent stacks used for? To limit pressure differentials in the soil stack on a multi-storey building
Where must a vent stack connect? at- or below the fixtures on the lowest soil or waste branch
What's the minimum size of a vent stack? It shall not be less than one half the size of the soil or waste stack at the base
When are Yoke Vents Required? only required on buildings that are more than 11 storey's in height
How many fixture units are allowed to connect to a vent 8
stack?
How high must a building be before a vent stack is More than 4 storey's, that have plumbing fixtures connected.
required?
Where are yoke vents connected on the stack in a Yoke vents are connected for each section of five stories or part therof on which
building with fixtures on more than 11 storeys? fixtures are located, counting from the top down, and at or immediately above
each offset or double offset.
How is a Bathroom group sized when tied into the vent As a wet vent
stack?
Fixtures must be Certified
Minimum supply pipe for tank type W.C is 3/8''
What 2 things must Jetted Tubs have? an acess Panel
-a GFI
Name 3 major vents in a plumbing system Vent
header
Vent Stack
Stack Vent
What is the minimum size of Roof increaser 1 1/4'' x 3inches
What 3 things must a sump have when being connected -Union
to a building drain? -Check valve
-Gate or ball Valve
What is the reason why a check valve is required on a Sanitary drainage
sump connecting to a building drain
What does Subsoil drainage refer to? pipes that are installed underground to intercept and convey groundwater.
