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ABYC Systems Certification Exam Review Questions with correct Answers 2024
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ABYC Systems Certification ExamReview
Polyethylene - answer What is the most often used materials for potable water
systems?
1. Copper Alloys (incl. bronze, brass and nickel-copper)
2. AISI Type 300 series stainless steel
3. Glass-lined metal
4. FDA approved plastic
5. FDA approved rubber - answer Name 5 materials allowable for contact use in potable
water systems:
Siphon Break - answer What device can be used to separate potable water from other
water systems?
Accumulator Tank, after pump/filter and before check-valve - answer What is the device
used to maintain a stable pressure and minimize pump cycling, and where should it be
located?
175% - answerAt what what percentage of nominal working pressure shall the relief
valve be set?
No, typically these are too high (up to 400% of nominal pressure) - answer Is a standard
household type relief valve acceptable for hot water tanks?
nominal working pressure, not to exceed 80 PSI - answerFor the pressure reducing
valve and check valve installed after a shore water connection, what is the maximum
allowable pressure?
overboard - answerWhere shall the storage tank be vented?
3 PSI or mnfg's maximum, which ever is greater. - answerWhat is the maximum
allowable pressure to which the storage tank and vent system be subjected?
-40 °F to +140 °F - answerWhat temperate range is required for pumps to be able to
tolerate exposure?
257 F - answerWhen operating at an ambient temperature of 140 F, what is the max
allowable surface temperature of a pump?
,True - answerPotable water systems must be equipped with a drain. T or F?
False - answerStorage tank inlet may also serve as the tank vent. T or F?
True - answerStorage tank inlet caps must be retained to prevent loss. T or F?
True - answerStorage tanks must be equipped with a vent. T or F?
True - answerStorage tank vent may be used for filling purposes. T or F?
At least 1.5X the pressure exerted by the distance from the tank bottom to the deck fill
plate or vent, but not less than 3 PSI. - answerWhat rate of static pressure must a
storage tank withstand?
3 PSI - answerWhat is the max pressure that a desalinator can impart to a storage
tank?
True - answerEach desalinator must be equipped with an automatic shutoff salinity
detector. T or F?
"For Cold Water Use Only" - answerWhat marking must be on pipe or tubes that are not
capable of handling hot water?
125 PSI, 300 PSI - answerWhat is the test pressure for water heater tank 15 gal or
less? over 15 gal but under 120 gal?
175 PSI - answerWhat is the max pressure relief valve setting for hot water tanks?
210 F - answerWhat is the max temperature relief setting for hot water tanks?
125 F - answerWhat is the max allowable water output temperature for hot water
system?
True - answerAll potable water system connections shall be positioned above the
normal bilge water accumulation level. T or F?
True - answerExposed metallic parts of a potable water system shall have provisions for
electrical bonding. T or F?
Improper venting - answerFor what reason might a holding tank collapse during pump-
out?
Type I - answerWhat type of MSD (Marine Sanitation Device) discharges effluent with
fecal coliform bacteria count <= 1,000 (per 100 ml) and no suspended solids?
, Type II - answerWhat type of MSD (Marine Sanitation Device) discharges effluent with
fecal coliform bacteria count <= 200 (per 100 ml) and <= 150 mg suspended solids per
liter?
Type III - answerWhat type of MSD (Marine Sanitation Device) is designed to hold
sewage or any waste derived from sewage?
Retention System - answerWhat is the name given to the complete system including
toilets, hoses, pipes, holding tanks and fittings designed to receive, retain, vent and
pump out sewage?
Treatment System - answerWhat is the name of the system that includes all sanitation
equipment and fittings designed to receive, treat, vent and discharge sewage?
Siphon break - answerWhat is another name for a vented loop that prevents back
siphoning by breaking suction yet allowing normal flow when pressurized?
5 - answerWhen calculating holding tank size, how many flushes per day are included in
the calculation?
0.14 gallons - answerWhat volume of human waste is used per flush when calculating
holding tank size?
True - answerTrue or False: If a portable toilet is secured and fitted with a deck pump-
out fitting and vent it qualifies as a type III device.
Prevention of siphoning - answerWhy must careful consideration be given to the
location and routing of inlet and discharge lines for manual flush toilets when the "shut-
off" merely bleeds air into the inlet line?
Whenever components are installed below the max heeled water line - to prevent back
flow into the vessel or unintentional siphoning of untreated effluent overboard. -
answerWhen and why must siphon breaks be installed in a sewage system?
True - answerA seacock may be installed instead of a siphon break to prevent
discharge and back siphoning. T or F?
The handle must be lockable in the direction of the holding tank - answerWhat special
provision must be included for a sewage y-valve when the discharge seacock is not
lockable?
Air Gap, Vacuum Break, Double Check Valve, Dedicated Water Tank - answerName
four ways to separate a fresh water flushing system from potable water system.
1.5 inches - answerWhat is the minimum hose ID for use on un-macerated sewage?
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