ASPE CPD Study Questions AH with all Correct & 100%
Verified Answers |Actual Complete Update |Already
Graded A+
Front ✔Correct Answer-Back
What is the specific weight of water? ✔Correct Answer-62.4 lbs per cubic foot
What happens in a storm and sanitary system after it passes the water test? ✔Correct
Answer-A smoke pressure test is recommended with a smoke pressure of 1 in wc to prove the
system gas tight.
Is an air test acceptable for a storm and sanitary system? ✔Correct Answer-Yes, if a water test
is not possible, at a pressure of 5 psi, are tests are impractical and costly
What are the testing procedures for the storm and sanitary system? ✔Correct Answer-A
water test upon completion of the rough piping and prior to concealment of 10 ft wc minimum
(except the topmost 10 feet of pipe), not to exceed 100 ft wc. If system is higher than 100 feet,
test plugs must be installed to facilitate testing, rarely are more than 7 stories tested at one
time. A peppermint oil test may also be done with 2 oz of peppermint oil and 10 qt boiling
water, and searching for peppermint smell at leaks, however it is difficult to pinpoint the leak by
this method
The maximum length from the vent connection to any future drain outlet is required by code,
why, how long is the distance (listed in the book), and what‚Äôs the exception? ✔Correct
Answer-To prevent a dead end where slime, sludge and fungi can grow, 2 feet, unless the piping
must be extended to an accessible location for a cleanout
A sanitary tee may be used in the vertical but what may not be used in the vertical and why?
✔Correct Answer-A double sanitary tee because the possibility of flow crossover and excessive
pressures when one branch is discharging and the other isn’t are possible
What are the slopes of pipe inside the building that correspond to 2 fps velocity? ✔Correct
Answer-1/4 in per foot for 3 in and smaller 1/8 in per foot for larger pipe all elbows, taps, tees
etc are tapped at a pitch of 1/4” per foot
Where should cleanouts be provided? ✔Correct Answer-1) Inside or outside the building at
the point of exit (use a wye branch) 2) at every change in direction greater than 45 degrees 3)
every 50 feet for piping 4” and less, and 100 ft for larger piping 4) underground piping larger
than 10 in should be provided with manholes at every change in direction and every 150 feet 5)
at the base of all stacks 6) as required by code
,What size cleanouts are provided in piping? ✔Correct Answer-Piping up to 4 inches, the
cleanout is the same size as the pipe. Piping greater than 4 inches, 4 inch cleanouts are
adequate.
What should be installed in the house drain if there is a danger of backflow of sewage into the
building? Whats the difference? ✔Correct Answer-A backwater valve or a combination BWV
with manually operated gate valve. The BWV does not interfere with the airflow throughout the
system, and the gate valve is recommended where there is a history of backflow as a positive
means of protection.
Branch connections to the house drain should be made where and why? ✔Correct Answer-At
the upper portion of the pipe (above the 1/2 - 2/3 full mark) because: 1) there is a lower chance
of stoppages in the branch 2) there is less flow interference at the point of connection 3) When
there is no flow in the branch, the full area of the pipe is available to relieve pneumatic pressure
fluctuations in the house drain
How many fixture units are equivalent to 1 gpm continuous or semicontinuous flow and what
are examples of these types of flow? ✔Correct Answer-2 FUs, sump pumps, ejectors, air
conditioning equipment, water cooled, equipment, etc
What minimum slopes are required for building drains and why? ✔Correct Answer-3 in pipe
and smaller: 1/4 in/ft 4-6 in pipe: 1/8 in/ft 8 in pipe and larger: 1/16 in/ft to maintain 2 fps
scouring action if low flow fixtures are present, 1/4 in/ft for all is a good idea
House drains are designed to flow how full? ✔Correct Answer-1/2 full to 3/4 full max under
uniform flow conditions
What is a house (building) drain? ✔Correct Answer-The lowest piping of a gravity drainage
system that receives the discharge from soil, waste, and other drainage pipes inside the building
that extends a short distance from the building and conveys the drainage to the building sewer
What is the measurement from horizontal that separates horizontal and vertical drainage
stacks? ✔Correct Answer-45 degrees
Does an interior drainage stack that offsets 45 degrees or less from the vertical require a change
in size? ✔Correct Answer-No. Any more than a 45 degree offset requires sizing the offset as a
house drain.
What is a branch interval? ✔Correct Answer-A building story or a distance between two
branch connections greater than 8 feet apart.
Describe the procedure for sizing interior drainage stacks. ✔Correct Answer-1) First size the
horizontal branches connecting to the stack 2) Determine the minimum size that will accept
,each branch at one branch interval 3) Total all fixture units connected to the stack, and
determine the size. The minimum size must be at least equal to the largest diameter required at
the base. You may reduce in size at upper branch intervals, but never by more than 1/2 the
largest size.
What is the total recommended maximum permissible flow in a stack? ✔Correct Answer-7/24
of the total cross sectional area of the stack.
Where should and shouldn‚Äôt you connect branch connections to stack offsets? ✔Correct
Answer-Not to the horizontal offset to the stack if at all possible, unless its at least 10 pipe
diameters downstream, and ideally 2 feet above the offset or 2 feet below to avoid pressure
fluctuations.
What can minimize hydraulic jump? ✔Correct Answer-Increasing the slope of the horizontal
drain. Connecting to a horizontal drain that is larger than the stack.
Any offset of the stack greater than what can cause hydraulic jump? ✔Correct Answer-45
degrees
When does terminal velocity occur in a drainage stack? ✔Correct Answer-It is achieved at
approximately 10 - 15 fps and this velocity is achieved within 10 - 15 feet of fall from the point
of entry.
A drainage stack should never be designed for a capacity greater than what and why?
✔Correct Answer-One-thrid full, because the pressure fluctuations in the system could greatly
exceed the maximum 1 in water column criterion and lose their seal by siphonage blowout
What is one positive and one negative of a tee-wye fitting? ✔Correct Answer-The long radius
tee-wye fitting gives the water a greater downward component than a sanitary tee, but also has
a greater probability of siphoning the traps
How are horizontal branch connections to the stack made? ✔Correct Answer-With a sanitary
tee (a short radius tee-wye, vertical position only) or with a long radius tee-wye (vertical or
horizontal position). (The tee-wye is also called a combination wye and one-eighth bend)
What is the difference between soil stacks and waste stacks? ✔Correct Answer-Soil stacks
collect wastes that contain fecal matter, and waste stacks collect wastes that do not contain
fecal matter (lavatories, sinks, etc)
What is a vent stack? ✔Correct Answer-A vent stack prevents the development of excessive
pressures in the lower regions of the drainage stack by relieving the air that is rapidly carried
down the drainage stack. It does not include vertical fixture drains and branch vents that do not
pass through more than two stories before being connected to the soil or waste stack or vent
stack.
, What is a general term for any vertical line of soil or waste piping that collects water and wastes
from fixture drains and horizontal branch drains from two or more floors of a building?
✔Correct Answer-A Stack.
Properties of uniform flow apply to branches of what length and longer? ✔Correct Answer-5
feet
Special wastes, tank overflows, tank emptying lines, releif valve discharges, etc. should
discharge where and why? ✔Correct Answer-Through an air break to an appropriate
receptacle (floor drain or other) to prevent overpressurization of the drainage system.
High temperature wastes should be cooled to what temperature before discharging into the
drainage system? ✔Correct Answer-140F
When interior drainage piping developed length reaches 100 feet, what should happen and
why? ✔Correct Answer-A vent to atmosphere should be provided. It should run
independently through the roof, this is to prevent the rapid fouling of the pipe due to the
growth of slime and fungi in the absence of air circulation.
The sizing for indirect wastes is the same as direct-waste connections with what exception?
✔Correct Answer-Due to the low velocities usually present in indirect wastes, stoppages are
more prevalent, and cleanouts should be provided at every possible location.
For an indirect waste, the discharge outlet should be what? ✔Correct Answer-A minimum of
1.5 times the indirect pipe size above the flood level of the receptacle.
How can the fixture unit flow rate be calculated? ✔Correct Answer-By dividing the total
discharge flow in gallons per minute of a single fixture divided by 7.5 gal/ft^3
What factors do FUs account for? ✔Correct Answer-Application in conjunction with the
probability of simultaneous use of fixtures.
For interior drainage systems, the rate of flow in a fixture drain should be what? ✔Correct
Answer-The same as the rate of flow discharged at the fixture outlet.
For interior drainage systems, the minimum fixture drain size is what? ✔Correct Answer-The
minimum size of the fixture trap (often given in a table)
What is the recommended value of n, the coefficient of roughness, for storm drains of all sizes?
✔Correct Answer-0.0145
The designer must know what as related to the sewer, water, and gas inverts and locations?
✔Correct Answer-The actual elevation of all of the floors of the building.
Verified Answers |Actual Complete Update |Already
Graded A+
Front ✔Correct Answer-Back
What is the specific weight of water? ✔Correct Answer-62.4 lbs per cubic foot
What happens in a storm and sanitary system after it passes the water test? ✔Correct
Answer-A smoke pressure test is recommended with a smoke pressure of 1 in wc to prove the
system gas tight.
Is an air test acceptable for a storm and sanitary system? ✔Correct Answer-Yes, if a water test
is not possible, at a pressure of 5 psi, are tests are impractical and costly
What are the testing procedures for the storm and sanitary system? ✔Correct Answer-A
water test upon completion of the rough piping and prior to concealment of 10 ft wc minimum
(except the topmost 10 feet of pipe), not to exceed 100 ft wc. If system is higher than 100 feet,
test plugs must be installed to facilitate testing, rarely are more than 7 stories tested at one
time. A peppermint oil test may also be done with 2 oz of peppermint oil and 10 qt boiling
water, and searching for peppermint smell at leaks, however it is difficult to pinpoint the leak by
this method
The maximum length from the vent connection to any future drain outlet is required by code,
why, how long is the distance (listed in the book), and what‚Äôs the exception? ✔Correct
Answer-To prevent a dead end where slime, sludge and fungi can grow, 2 feet, unless the piping
must be extended to an accessible location for a cleanout
A sanitary tee may be used in the vertical but what may not be used in the vertical and why?
✔Correct Answer-A double sanitary tee because the possibility of flow crossover and excessive
pressures when one branch is discharging and the other isn’t are possible
What are the slopes of pipe inside the building that correspond to 2 fps velocity? ✔Correct
Answer-1/4 in per foot for 3 in and smaller 1/8 in per foot for larger pipe all elbows, taps, tees
etc are tapped at a pitch of 1/4” per foot
Where should cleanouts be provided? ✔Correct Answer-1) Inside or outside the building at
the point of exit (use a wye branch) 2) at every change in direction greater than 45 degrees 3)
every 50 feet for piping 4” and less, and 100 ft for larger piping 4) underground piping larger
than 10 in should be provided with manholes at every change in direction and every 150 feet 5)
at the base of all stacks 6) as required by code
,What size cleanouts are provided in piping? ✔Correct Answer-Piping up to 4 inches, the
cleanout is the same size as the pipe. Piping greater than 4 inches, 4 inch cleanouts are
adequate.
What should be installed in the house drain if there is a danger of backflow of sewage into the
building? Whats the difference? ✔Correct Answer-A backwater valve or a combination BWV
with manually operated gate valve. The BWV does not interfere with the airflow throughout the
system, and the gate valve is recommended where there is a history of backflow as a positive
means of protection.
Branch connections to the house drain should be made where and why? ✔Correct Answer-At
the upper portion of the pipe (above the 1/2 - 2/3 full mark) because: 1) there is a lower chance
of stoppages in the branch 2) there is less flow interference at the point of connection 3) When
there is no flow in the branch, the full area of the pipe is available to relieve pneumatic pressure
fluctuations in the house drain
How many fixture units are equivalent to 1 gpm continuous or semicontinuous flow and what
are examples of these types of flow? ✔Correct Answer-2 FUs, sump pumps, ejectors, air
conditioning equipment, water cooled, equipment, etc
What minimum slopes are required for building drains and why? ✔Correct Answer-3 in pipe
and smaller: 1/4 in/ft 4-6 in pipe: 1/8 in/ft 8 in pipe and larger: 1/16 in/ft to maintain 2 fps
scouring action if low flow fixtures are present, 1/4 in/ft for all is a good idea
House drains are designed to flow how full? ✔Correct Answer-1/2 full to 3/4 full max under
uniform flow conditions
What is a house (building) drain? ✔Correct Answer-The lowest piping of a gravity drainage
system that receives the discharge from soil, waste, and other drainage pipes inside the building
that extends a short distance from the building and conveys the drainage to the building sewer
What is the measurement from horizontal that separates horizontal and vertical drainage
stacks? ✔Correct Answer-45 degrees
Does an interior drainage stack that offsets 45 degrees or less from the vertical require a change
in size? ✔Correct Answer-No. Any more than a 45 degree offset requires sizing the offset as a
house drain.
What is a branch interval? ✔Correct Answer-A building story or a distance between two
branch connections greater than 8 feet apart.
Describe the procedure for sizing interior drainage stacks. ✔Correct Answer-1) First size the
horizontal branches connecting to the stack 2) Determine the minimum size that will accept
,each branch at one branch interval 3) Total all fixture units connected to the stack, and
determine the size. The minimum size must be at least equal to the largest diameter required at
the base. You may reduce in size at upper branch intervals, but never by more than 1/2 the
largest size.
What is the total recommended maximum permissible flow in a stack? ✔Correct Answer-7/24
of the total cross sectional area of the stack.
Where should and shouldn‚Äôt you connect branch connections to stack offsets? ✔Correct
Answer-Not to the horizontal offset to the stack if at all possible, unless its at least 10 pipe
diameters downstream, and ideally 2 feet above the offset or 2 feet below to avoid pressure
fluctuations.
What can minimize hydraulic jump? ✔Correct Answer-Increasing the slope of the horizontal
drain. Connecting to a horizontal drain that is larger than the stack.
Any offset of the stack greater than what can cause hydraulic jump? ✔Correct Answer-45
degrees
When does terminal velocity occur in a drainage stack? ✔Correct Answer-It is achieved at
approximately 10 - 15 fps and this velocity is achieved within 10 - 15 feet of fall from the point
of entry.
A drainage stack should never be designed for a capacity greater than what and why?
✔Correct Answer-One-thrid full, because the pressure fluctuations in the system could greatly
exceed the maximum 1 in water column criterion and lose their seal by siphonage blowout
What is one positive and one negative of a tee-wye fitting? ✔Correct Answer-The long radius
tee-wye fitting gives the water a greater downward component than a sanitary tee, but also has
a greater probability of siphoning the traps
How are horizontal branch connections to the stack made? ✔Correct Answer-With a sanitary
tee (a short radius tee-wye, vertical position only) or with a long radius tee-wye (vertical or
horizontal position). (The tee-wye is also called a combination wye and one-eighth bend)
What is the difference between soil stacks and waste stacks? ✔Correct Answer-Soil stacks
collect wastes that contain fecal matter, and waste stacks collect wastes that do not contain
fecal matter (lavatories, sinks, etc)
What is a vent stack? ✔Correct Answer-A vent stack prevents the development of excessive
pressures in the lower regions of the drainage stack by relieving the air that is rapidly carried
down the drainage stack. It does not include vertical fixture drains and branch vents that do not
pass through more than two stories before being connected to the soil or waste stack or vent
stack.
, What is a general term for any vertical line of soil or waste piping that collects water and wastes
from fixture drains and horizontal branch drains from two or more floors of a building?
✔Correct Answer-A Stack.
Properties of uniform flow apply to branches of what length and longer? ✔Correct Answer-5
feet
Special wastes, tank overflows, tank emptying lines, releif valve discharges, etc. should
discharge where and why? ✔Correct Answer-Through an air break to an appropriate
receptacle (floor drain or other) to prevent overpressurization of the drainage system.
High temperature wastes should be cooled to what temperature before discharging into the
drainage system? ✔Correct Answer-140F
When interior drainage piping developed length reaches 100 feet, what should happen and
why? ✔Correct Answer-A vent to atmosphere should be provided. It should run
independently through the roof, this is to prevent the rapid fouling of the pipe due to the
growth of slime and fungi in the absence of air circulation.
The sizing for indirect wastes is the same as direct-waste connections with what exception?
✔Correct Answer-Due to the low velocities usually present in indirect wastes, stoppages are
more prevalent, and cleanouts should be provided at every possible location.
For an indirect waste, the discharge outlet should be what? ✔Correct Answer-A minimum of
1.5 times the indirect pipe size above the flood level of the receptacle.
How can the fixture unit flow rate be calculated? ✔Correct Answer-By dividing the total
discharge flow in gallons per minute of a single fixture divided by 7.5 gal/ft^3
What factors do FUs account for? ✔Correct Answer-Application in conjunction with the
probability of simultaneous use of fixtures.
For interior drainage systems, the rate of flow in a fixture drain should be what? ✔Correct
Answer-The same as the rate of flow discharged at the fixture outlet.
For interior drainage systems, the minimum fixture drain size is what? ✔Correct Answer-The
minimum size of the fixture trap (often given in a table)
What is the recommended value of n, the coefficient of roughness, for storm drains of all sizes?
✔Correct Answer-0.0145
The designer must know what as related to the sewer, water, and gas inverts and locations?
✔Correct Answer-The actual elevation of all of the floors of the building.
