1|Page
ASPE CPD Study Questions AH Questions
and Correct Answers/ Latest Update /
Already Graded
Front
Ans: Back
What is the specific weight of water?
Ans: 62.4 lbs per cubic foot
What happens in a storm and sanitary system after it passes the
water test?
Ans: 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?
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,2|Page
Ans: 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?
Ans: 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?
Ans: 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
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,3|Page
A sanitary tee may be used in the vertical but what may not be used
in the vertical and why?
Ans: 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?
Ans: 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?
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, 4|Page
Ans: 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?
Ans: 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?
Ans: 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.
Medstudy.com
ASPE CPD Study Questions AH Questions
and Correct Answers/ Latest Update /
Already Graded
Front
Ans: Back
What is the specific weight of water?
Ans: 62.4 lbs per cubic foot
What happens in a storm and sanitary system after it passes the
water test?
Ans: 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?
Medstudy.com
,2|Page
Ans: 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?
Ans: 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?
Ans: 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
Medstudy.com
,3|Page
A sanitary tee may be used in the vertical but what may not be used
in the vertical and why?
Ans: 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?
Ans: 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?
Medstudy.com
, 4|Page
Ans: 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?
Ans: 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?
Ans: 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.
Medstudy.com
