ASPE CPD STUDY QUESTIONS AND
ANSWERS | LATEST 2024
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), 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
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 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? - 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 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 Sconnections Sto Sthe Shouse Sdrain Sshould Sbe Smade Swhere Sand Swhy? S- S SAt Sthe
Supper Sportion Sof Sthe Spipe S(above Sthe S1/2 S- S2/3 Sfull Smark) Sbecause: S1) Sthere Sis Sa Slower
Schance Sof Sstoppages Sin Sthe Sbranch S2) Sthere Sis Sless Sflow Sinterference Sat Sthe Spoint Sof
Sconnection S3) SWhen Sthere Sis Sno Sflow Sin Sthe Sbranch, Sthe Sfull Sarea Sof Sthe Spipe Sis
Savailable Sto Srelieve Spneumatic Spressure Sfluctuations Sin Sthe Shouse Sdrain
How Smany Sfixture Sunits Sare Sequivalent Sto S1 Sgpm Scontinuous Sor Ssemicontinuous Sflow
Sand Swhat Sare Sexamples Sof Sthese Stypes Sof Sflow? S- S S2 SFUs, Ssump Spumps, Sejectors, Sair
Sconditioning Sequipment, Swater Scooled, Sequipment, Setc
What Sminimum Sslopes Sare Srequired Sfor Sbuilding Sdrains Sand Swhy? S- S S3 Sin Spipe Sand
Ssmaller: S1/4 Sin/ft S4-6 Sin Spipe: S1/8 Sin/ft S8 Sin Spipe Sand Slarger: S1/16 Sin/ft Sto Smaintain S2
Sfps Sscouring Saction Sif Slow Sflow Sfixtures Sare Spresent, S1/4 Sin/ft Sfor Sall Sis Sa Sgood Sidea
House Sdrains Sare Sdesigned Sto Sflow Show Sfull? S- S S1/2 Sfull Sto S3/4 Sfull Smax Sunder Suniform
Sflow Sconditions
What Sis Sa Shouse S(building) Sdrain? S- S SThe Slowest Spiping Sof Sa Sgravity Sdrainage Ssystem
Sthat Sreceives Sthe Sdischarge Sfrom Ssoil, Swaste, Sand Sother Sdrainage Spipes Sinside Sthe
Sbuilding Sthat Sextends Sa Sshort Sdistance Sfrom Sthe Sbuilding Sand Sconveys Sthe Sdrainage Sto
Sthe Sbuilding Ssewer
What Sis Sthe Smeasurement Sfrom Shorizontal Sthat Sseparates Shorizontal Sand Svertical
Sdrainage Sstacks? S- S S45 Sdegrees
Does San Sinterior Sdrainage Sstack Sthat Soffsets S45 Sdegrees Sor Sless Sfrom Sthe Svertical
Srequire Sa Schange Sin Ssize? S- S SNo. SAny Smore Sthan Sa S45 Sdegree Soffset Srequires Ssizing
Sthe Soffset Sas Sa Shouse Sdrain.
What Sis Sa Sbranch Sinterval? S- S SA Sbuilding Sstory Sor Sa Sdistance Sbetween Stwo Sbranch
Sconnections Sgreater Sthan S8 Sfeet Sapart.
Describe Sthe Sprocedure Sfor Ssizing Sinterior Sdrainage Sstacks. S- S S1) SFirst Ssize Sthe
Shorizontal Sbranches Sconnecting Sto Sthe Sstack S2) SDetermine Sthe Sminimum Ssize Sthat Swill
Saccept Seach Sbranch Sat Sone Sbranch Sinterval S3) STotal Sall Sfixture Sunits Sconnected Sto Sthe
,Sstack, Sand Sdetermine Sthe Ssize. SThe Sminimum Ssize Smust Sbe Sat Sleast Sequal Sto Sthe
Slargest Sdiameter Srequired Sat Sthe Sbase. SYou Smay Sreduce Sin Ssize Sat Supper Sbranch
Sintervals, Sbut Snever Sby Smore Sthan S1/2 Sthe Slargest Ssize.
What Sis Sthe Stotal Srecommended Smaximum Spermissible Sflow Sin Sa Sstack? S- S S7/24 Sof Sthe
Stotal Scross Ssectional Sarea Sof Sthe Sstack.
Where Sshould Sand Sshouldn’t Syou Sconnect Sbranch Sconnections Sto Sstack Soffsets? S- S
SNot Sto Sthe Shorizontal Soffset Sto Sthe Sstack Sif Sat Sall Spossible, Sunless Sits Sat Sleast S10 Spipe
Sdiameters Sdownstream, Sand Sideally S2 Sfeet Sabove Sthe Soffset Sor S2 Sfeet Sbelow Sto Savoid
Spressure Sfluctuations.
What Scan Sminimize Shydraulic Sjump? S- S SIncreasing Sthe Sslope Sof Sthe Shorizontal Sdrain.
SConnecting Sto Sa Shorizontal Sdrain Sthat Sis Slarger Sthan Sthe Sstack.
Any Soffset Sof Sthe Sstack Sgreater Sthan Swhat Scan Scause Shydraulic Sjump? S- S S45 Sdegrees
When Sdoes Sterminal Svelocity Soccur Sin Sa Sdrainage Sstack? S- S SIt Sis Sachieved Sat
Sapproximately S10 S- S15 Sfps Sand Sthis Svelocity Sis Sachieved Swithin S10 S- S15 Sfeet Sof Sfall
Sfrom Sthe Spoint Sof Sentry.
A Sdrainage Sstack Sshould Snever Sbe Sdesigned Sfor Sa Scapacity Sgreater Sthan Swhat Sand
Swhy? S- S SOne-thrid Sfull, Sbecause Sthe Spressure Sfluctuations Sin Sthe Ssystem Scould Sgreatly
Sexceed Sthe Smaximum S1 Sin Swater Scolumn Scriterion Sand Slose Stheir Sseal Sby Ssiphonage
Sblowout
What Sis Sone Spositive Sand Sone Snegative Sof Sa Stee-wye Sfitting? S- S SThe Slong Sradius Stee-
wye Sfitting Sgives Sthe Swater Sa Sgreater Sdownward Scomponent Sthan Sa Ssanitary Stee, Sbut
Salso Shas Sa Sgreater Sprobability Sof Ssiphoning Sthe Straps
How Sare Shorizontal Sbranch Sconnections Sto Sthe Sstack Smade? S- S SWith Sa Ssanitary Stee S(a
Sshort Sradius Stee-wye, Svertical Sposition Sonly) Sor Swith Sa Slong Sradius Stee-wye S(vertical Sor
Shorizontal Sposition). S(The Stee-wye Sis Salso Scalled Sa Scombination Swye Sand Sone-eighth
Sbend)
What Sis Sthe Sdifference Sbetween Ssoil Sstacks Sand Swaste Sstacks? S- S SSoil Sstacks Scollect
Swastes Sthat Scontain Sfecal Smatter, Sand Swaste Sstacks Scollect Swastes Sthat Sdo Snot
Scontain Sfecal Smatter S(lavatories, Ssinks, Setc)
What Sis Sa Svent Sstack? S- S SA Svent Sstack Sprevents Sthe Sdevelopment Sof Sexcessive
Spressures Sin Sthe Slower Sregions Sof Sthe Sdrainage Sstack Sby Srelieving Sthe Sair Sthat Sis
Srapidly Scarried Sdown Sthe Sdrainage Sstack. SIt Sdoes Snot Sinclude Svertical Sfixture Sdrains
Sand Sbranch Svents Sthat Sdo Snot Spass Sthrough Smore Sthan Stwo Sstories Sbefore Sbeing
Sconnected Sto Sthe Ssoil Sor Swaste Sstack Sor Svent Sstack.
, What Sis Sa Sgeneral Sterm Sfor Sany Svertical Sline Sof Ssoil Sor Swaste Spiping Sthat Scollects Swater
Sand Swastes Sfrom Sfixture Sdrains Sand Shorizontal Sbranch Sdrains Sfrom Stwo Sor Smore Sfloors
Sof Sa Sbuilding? S- S SA SStack.
Properties Sof Suniform Sflow Sapply Sto Sbranches Sof Swhat Slength Sand Slonger? S- S S5 Sfeet
Special Swastes, Stank Soverflows, Stank Semptying Slines, Sreleif Svalve Sdischarges, Setc.
Sshould Sdischarge Swhere Sand Swhy? S- S SThrough San Sair Sbreak Sto San Sappropriate
Sreceptacle S(floor Sdrain Sor Sother) Sto Sprevent Soverpressurization Sof Sthe Sdrainage
Ssystem.
High Stemperature Swastes Sshould Sbe Scooled Sto Swhat Stemperature Sbefore Sdischarging
Sinto Sthe Sdrainage Ssystem? S- S S140F
When Sinterior Sdrainage Spiping Sdeveloped Slength Sreaches S100 Sfeet, Swhat Sshould
Shappen Sand Swhy? S- S SA Svent Sto Satmosphere Sshould Sbe Sprovided. SIt Sshould Srun
Sindependently Sthrough Sthe Sroof, Sthis Sis Sto Sprevent Sthe Srapid Sfouling Sof Sthe Spipe Sdue Sto
Sthe Sgrowth Sof Sslime Sand Sfungi Sin Sthe Sabsence Sof Sair Scirculation.
The Ssizing Sfor Sindirect Swastes Sis Sthe Ssame Sas Sdirect-waste Sconnections Swith Swhat
Sexception? S- S SDue Sto Sthe Slow Svelocities Susually Spresent Sin Sindirect Swastes, Sstoppages
Sare Smore Sprevalent, Sand Scleanouts Sshould Sbe Sprovided Sat Severy Spossible Slocation.
For San Sindirect Swaste, Sthe Sdischarge Soutlet Sshould Sbe Swhat? S- S SA Sminimum Sof S1.5
Stimes Sthe Sindirect Spipe Ssize Sabove Sthe Sflood Slevel Sof Sthe Sreceptacle.
How Scan Sthe Sfixture Sunit Sflow Srate Sbe Scalculated? S- S SBy Sdividing Sthe Stotal Sdischarge
Sflow Sin Sgallons Sper Sminute Sof Sa Ssingle Sfixture Sdivided Sby S7.5 Sgal/ft^3
What Sfactors Sdo SFUs Saccount Sfor? S- S SApplication Sin Sconjunction Swith Sthe Sprobability Sof
Ssimultaneous Suse Sof Sfixtures.
For Sinterior Sdrainage Ssystems, Sthe Srate Sof Sflow Sin Sa Sfixture Sdrain Sshould Sbe Swhat? S- S
SThe Ssame Sas Sthe Srate Sof Sflow Sdischarged Sat Sthe Sfixture Soutlet.
For Sinterior Sdrainage Ssystems, Sthe Sminimum Sfixture Sdrain Ssize Sis Swhat? S- S SThe
Sminimum Ssize Sof Sthe Sfixture Strap S(often Sgiven Sin Sa Stable)
What Sis Sthe Srecommended Svalue Sof Sn, Sthe Scoefficient Sof Sroughness, Sfor Sstorm Sdrains
Sof Sall Ssizes? S- S S0.0145
The Sdesigner Smust Sknow Swhat Sas Srelated Sto Sthe Ssewer, Swater, Sand Sgas Sinverts Sand
Slocations? S- S SThe Sactual Selevation Sof Sall Sof Sthe Sfloors Sof Sthe Sbuilding.
What Sis Sthe Sminimum Svelocity Sof Sflow Sto Sachieve Sscouring Saction Sin Spiping? SFor
Skeeping Sgrease Sin Ssuspension Sin Sgreasy Swastes? SFor Ssuspension Sin SStorm SSewers?
