ASPE CPD Study (UPDATED 2026) EXAM
QUESTIONS AND ALL CORRECT
ANSWERS 100% SOLVED AND
GUARANTEED SUCCESS!!
Front -CORRECTANSWER Back
What is the specific weight of water? -CORRECTANSWER 62.4 lbs per cubic foot
What happens in a storm and sanitary system after it passes the water test? -
CORRECTANSWER 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? -CORRECTANSWER 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? -
CORRECTANSWER 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’s the exception? -
CORRECTANSWER 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? -CORRECTANSWER 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? -
CORRECTANSWER 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? -CORRECTANSWER 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? -CORRECTANSWER 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? -CORRECTANSWER 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? -
CORRECTANSWER 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? -CORRECTANSWER 2 FUs, sump pumps,
ejectors, air conditioning equipment, water cooled, equipment, etc
What minimum slopes are required for building drains and why? -CORRECTANSWER
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? -CORRECTANSWER 1/2 full to 3/4 full
max under uniform flow conditions
What is a house (building) drain? -CORRECTANSWER 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? -CORRECTANSWER 45 degrees
Does an interior drainage stack that offsets 45 degrees or less from the vertical require
a change in size? -CORRECTANSWER No. Any more than a 45 degree offset requires
sizing the offset as a house drain.
What is a branch interval? -CORRECTANSWER A building story or a distance between
two branch connections greater than 8 feet apart.
Describe the procedure for sizing interior drainage stacks. -CORRECTANSWER 1) First
size the horizontal branches connecting to the stack 2) Determine the minimum size
QUESTIONS AND ALL CORRECT
ANSWERS 100% SOLVED AND
GUARANTEED SUCCESS!!
Front -CORRECTANSWER Back
What is the specific weight of water? -CORRECTANSWER 62.4 lbs per cubic foot
What happens in a storm and sanitary system after it passes the water test? -
CORRECTANSWER 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? -CORRECTANSWER 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? -
CORRECTANSWER 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’s the exception? -
CORRECTANSWER 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? -CORRECTANSWER 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? -
CORRECTANSWER 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? -CORRECTANSWER 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? -CORRECTANSWER 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? -CORRECTANSWER 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? -
CORRECTANSWER 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? -CORRECTANSWER 2 FUs, sump pumps,
ejectors, air conditioning equipment, water cooled, equipment, etc
What minimum slopes are required for building drains and why? -CORRECTANSWER
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? -CORRECTANSWER 1/2 full to 3/4 full
max under uniform flow conditions
What is a house (building) drain? -CORRECTANSWER 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? -CORRECTANSWER 45 degrees
Does an interior drainage stack that offsets 45 degrees or less from the vertical require
a change in size? -CORRECTANSWER No. Any more than a 45 degree offset requires
sizing the offset as a house drain.
What is a branch interval? -CORRECTANSWER A building story or a distance between
two branch connections greater than 8 feet apart.
Describe the procedure for sizing interior drainage stacks. -CORRECTANSWER 1) First
size the horizontal branches connecting to the stack 2) Determine the minimum size
