Exam (elaborations)
ASPE CPD STUDY QUESTIONS AH (EXAM BANK UPDATE) COMPLETE VERIFIED ANSWERS
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ASPE CPD STUDY QUESTIONSAH (EXAM BANK 2024-2025
UPDATE) COMPLETE VERIFIED
ANSWERS
Front
ÖÖ Back
What is the specific weight of water?
ÖÖ 62.4 lbs per cubic foot
What happens in a storm and sanitary system a@er it passes the water test?
ÖÖ A smoke pressure test is recommended with a smoke pressure of 1 in wc to
prove the system gas Dght.
Is an air test acceptable for a storm and sanitary system?
ÖÖ Yes, if a water test is not possible, at a pressure of 5 psi, are tests are
impracDcal and costly
What are the tesDng procedures for the storm and sanitary system?
ÖÖ A water test upon compleDon of the rough piping and prior to concealment
of 10 @ wc minimum (except the topmost 10 feet of pipe), not to exceed 100 @
wc. If system is higher than 100 feet, test plugs must be installed to facilitate
tesDng, rarely are more than 7 stories tested at one Dme. 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 connecDon to any future drain outlet is
required by code, why, how long is the distance (listed in the book), and
what‚äôs the excepDon?
ÖÖ To prevent a dead end where slime, sludge and fungi can grow, 2 feet,
unless the piping must be extended to an accessible locaDon for a cleanout
A sanitary tee may be used in the verDcal but what may not be used in the
verDcal and why?
ÖÖ A double sanitary tee because the possibility of flow crossover and
excessive pressures when one branch is discharging and the other isn‚äôt are
possible
What are the slopes of pipe inside the building that correspond to 2 fps
velocity?
ÖÖ 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‚äù per foot
Where should cleanouts be provided?
ÖÖ 1) inside or outside the building at the point of exit (use a wye branch) 2) at
every change in direcDon greater than 45 degrees 3) every 50 feet for piping
4‚äù and less, and 100 @ for larger piping 4) underground piping larger than 10
in should be provided with manholes at every change in direcDon and every
150 feet 5) at the base of all stacks 6) as required by code
What size cleanouts are provided in piping?
ÖÖ 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?
ÖÖ A backwater valve or a combinaDon 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 posiDve
means of protecDon.
ÖÖ Branch connecDons to the house drain should be made where and why?
At the upper porDon 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 connecDon 3) when there is no flow in the branch,
the full area of the pipe is available to relieve pneumaDc pressure fluctuaDons
in the house drain
How many fixture units are equivalent to 1 gpm conDnuous or semiconDnuous
flow and what are examples of these types of flow?
ÖÖ 2 fus, sump pumps, ejectors, air condiDoning equipment, water cooled,
equipment, etc
What minimum slopes are required for building drains and why?
ÖÖ 3 in pipe and smaller: 1/4 in/@ 4-6 in pipe: 1/8 in/@ 8 in pipe and larger:
1/16 in/@ to maintain 2 fps scouring acDon if low flow fixtures are present, 1/4
in/@ for all is a good idea
House drains are designed to flow how full?
ÖÖ 1/2 full to 3/4 full max under uniform flow condiDons
What is a house (building) drain?
ÖÖ 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
verDcal drainage stacks?
ÖÖ 45 degrees
, Does an interior drainage stack that offsets 45 degrees or less from the verDcal
require a change in size?
ÖÖ No. Any more than a 45 degree offset requires sizing the offset as a house
drain.
What is a branch interval?
ÖÖ A building story or a distance between two branch connecDons greater than
8 feet apart.
Describe the procedure for sizing interior drainage stacks.
ÖÖ 1) first size the horizontal branches connecDng 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?
ÖÖ 7/24 of the total cross secDonal area of the stack.
Where should and shouldn‚äôt you connect branch connecDons to stack
offsets?
ÖÖ 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 fluctuaDons.
What can minimize hydraulic jump?
ÖÖ Increasing the slope of the horizontal drain. ConnecDng to a horizontal drain
that is larger than the stack.
Any offset of the stack greater than what can cause hydraulic jump?
ÖÖ 45 degrees
When does terminal velocity occur in a drainage stack?
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