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ASPE CPD Study Questions AH Questions and Answers | Latest Update
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Front Back What is the specific weight of water? 62.4 lbs per cubic foot What happens in a storm and sanitary system after it passes the water test? 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 ...

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  • September 26, 2024
  • 87
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • aspe cpd study questions ah questions and answers
  • front back what is the specific weight of water

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2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!

ASPE CPD Study Questions AH Questions
and Answers | Latest Update
Front


✓ Back




What is the specific weight of water?


✓ 62.4 lbs per cubic foot




What happens in a storm and sanitary system after it passes the water test?


✓ 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?


✓ 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?


✓ 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),



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,2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!
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?


✓ 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?


✓ 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?


✓ 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




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,2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!
Where should cleanouts be provided?


✓ 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 manhol es 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?


✓ 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?


✓ A backwater valve or a combination BWV with manually operated gate

valve. The BWV does not inter fere 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?




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, 2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!
✓ 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 pneuma tic 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?


✓ 2 FUs, sump pumps, ejectors, air conditioning equipment, water cooled,

equipment, etc




What minimum slopes are required for building drains and why?


✓ 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?


✓ 1/2 full to 3/4 full max under uniform flow conditions




What is a house (building) drain?




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