ABYC
ABYC Systems Certification Exam
with | Actual Questions and
Answers Latest Updated
2025/2026 (Graded A+).
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% - ANSWER- At 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 - ANSWER- For the
pressure reducing
valve and check valve installed after a shore water connection, what is
the maximum
allowable
pressure?
overboard - ANSWER- Where shall the storage tank be vented?
ABYC Systems Certification Exam with Actual Questions and Answers Latest Updated 2025-2026 (Graded A+).
,ABYC
3 PSI or mnfg's maximum, which ever is greater. - ANSWER- What is
the maximum
allowable pressure to which the storage tank and vent system
be subjected?
-40 °F to +140 °F - ANSWER- What temperate range is required for
pumps to be able to
tolerate
exposure?
257 F - ANSWER- When operating at an ambient temperature of 140 F,
what is the max
allowable surface temperature of a
pump?
True - ANSWER- Potable water systems must be equipped with a drain. T or F?
False - ANSWER- Storage tank inlet may also serve as the tank vent. T or F?
True - ANSWER- Storage tank inlet caps must be retained to prevent loss. T or
F?
True - ANSWER- Storage tanks must be equipped with a vent. T or F?
True - ANSWER- Storage 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. - ANSWER- What rate of static
pressure must a
storage tank
withstand?
3 PSI - ANSWER- What is the max pressure that a desalinator can impart to
a storage
tank
?
True - ANSWER- Each desalinator must be equipped with an automatic
shutoff salinity
detector. T or
F?
"For Cold Water Use Only" - ANSWER- What marking must be on pipe or
tubes that are
not capable of handling hot
water?
125 PSI, 300 PSI - ANSWER- What is the test pressure for water heater tank
15 gal or
less? over 15 gal but under 120
gal?
ABYC Systems Certification Exam with Actual Questions and Answers Latest Updated 2025-2026 (Graded A+).
,ABYC
175 PSI - ANSWER- What is the max pressure relief valve setting for hot water
tanks?
210 F - ANSWER- What is the max temperature relief setting for hot water
tanks?
125 F - ANSWER- What is the max allowable water output temperature for
hot water
system
?
True - ANSWER- All potable water system connections shall be positioned
above the
normal bilge water accumulation level.
T or F?
True - ANSWER- Exposed metallic parts of a potable water system
shall have
provisions for electrical bonding. T
or F?
Improper venting - ANSWER- For what reason might a holding tank
collapse during
pump-
out?
Type I - ANSWER- What type of MSD (Marine Sanitation Device) discharges
effluent
with fecal coliform bacteria count <= 1,000 (per 100 ml) and no
suspended solids?
Type II - ANSWER- What 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 - ANSWER- What type of MSD (Marine Sanitation Device) is designed
to hold
sewage or any waste derived from
sewage?
Retention System - ANSWER- What 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 - ANSWER- What is the name of the system that includes
all sanitation equipment and fittings designed to receive, treat, vent and
discharge sewage?
Siphon break - ANSWER- What is another name for a vented loop that
prevents back
siphoning by breaking suction yet allowing normal flow when
pressurized?
5 - ANSWER- When calculating holding tank size, how many flushes per
ABYC Systems Certification Exam with Actual Questions and Answers Latest Updated 2025-2026 (Graded A+).
, ABYC
day are
included in the
calculation?
0.14 gallons - ANSWER- What volume of human waste is used per
flush when
calculating holding tank
size?
True - ANSWER- True 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 - ANSWER- Why must careful consideration be given
to the location and routing of inlet and discharge lines for manual flush
toilets when the "shutoff" 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. - ANSWER- When and why must siphon breaks be
installed in a sewage system?
True - ANSWER- A 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 - ANSWER-
What 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 -
ANSWER-
Name four ways to separate a fresh water flushing system from potable
water system.
1.5 inches - ANSWER- What is the minimum hose ID for use on un-macerated
sewage?
Secure mounting to minimize vibration effect, use flexible hose to connect
to fitting and
hull. - ANSWER- What provisions should be made if using rigid PVC for
sewage?
linear or cross-linked polyethylene, 1/4 inch thick or greater. - ANSWER-
What plastic
material is recommended for sewage holding
tanks?
Epoxy and Vinyl Esther are ok, but polyester resin is not because of
susceptibility to osmotic blistering. - ANSWER- Of the three major type of
Fiberglass Reinforced Plastic (FRP), which one is not recommended and why?
ABYC Systems Certification Exam with Actual Questions and Answers Latest Updated 2025-2026 (Graded A+).
ABYC Systems Certification Exam
with | Actual Questions and
Answers Latest Updated
2025/2026 (Graded A+).
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% - ANSWER- At 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 - ANSWER- For the
pressure reducing
valve and check valve installed after a shore water connection, what is
the maximum
allowable
pressure?
overboard - ANSWER- Where shall the storage tank be vented?
ABYC Systems Certification Exam with Actual Questions and Answers Latest Updated 2025-2026 (Graded A+).
,ABYC
3 PSI or mnfg's maximum, which ever is greater. - ANSWER- What is
the maximum
allowable pressure to which the storage tank and vent system
be subjected?
-40 °F to +140 °F - ANSWER- What temperate range is required for
pumps to be able to
tolerate
exposure?
257 F - ANSWER- When operating at an ambient temperature of 140 F,
what is the max
allowable surface temperature of a
pump?
True - ANSWER- Potable water systems must be equipped with a drain. T or F?
False - ANSWER- Storage tank inlet may also serve as the tank vent. T or F?
True - ANSWER- Storage tank inlet caps must be retained to prevent loss. T or
F?
True - ANSWER- Storage tanks must be equipped with a vent. T or F?
True - ANSWER- Storage 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. - ANSWER- What rate of static
pressure must a
storage tank
withstand?
3 PSI - ANSWER- What is the max pressure that a desalinator can impart to
a storage
tank
?
True - ANSWER- Each desalinator must be equipped with an automatic
shutoff salinity
detector. T or
F?
"For Cold Water Use Only" - ANSWER- What marking must be on pipe or
tubes that are
not capable of handling hot
water?
125 PSI, 300 PSI - ANSWER- What is the test pressure for water heater tank
15 gal or
less? over 15 gal but under 120
gal?
ABYC Systems Certification Exam with Actual Questions and Answers Latest Updated 2025-2026 (Graded A+).
,ABYC
175 PSI - ANSWER- What is the max pressure relief valve setting for hot water
tanks?
210 F - ANSWER- What is the max temperature relief setting for hot water
tanks?
125 F - ANSWER- What is the max allowable water output temperature for
hot water
system
?
True - ANSWER- All potable water system connections shall be positioned
above the
normal bilge water accumulation level.
T or F?
True - ANSWER- Exposed metallic parts of a potable water system
shall have
provisions for electrical bonding. T
or F?
Improper venting - ANSWER- For what reason might a holding tank
collapse during
pump-
out?
Type I - ANSWER- What type of MSD (Marine Sanitation Device) discharges
effluent
with fecal coliform bacteria count <= 1,000 (per 100 ml) and no
suspended solids?
Type II - ANSWER- What 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 - ANSWER- What type of MSD (Marine Sanitation Device) is designed
to hold
sewage or any waste derived from
sewage?
Retention System - ANSWER- What 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 - ANSWER- What is the name of the system that includes
all sanitation equipment and fittings designed to receive, treat, vent and
discharge sewage?
Siphon break - ANSWER- What is another name for a vented loop that
prevents back
siphoning by breaking suction yet allowing normal flow when
pressurized?
5 - ANSWER- When calculating holding tank size, how many flushes per
ABYC Systems Certification Exam with Actual Questions and Answers Latest Updated 2025-2026 (Graded A+).
, ABYC
day are
included in the
calculation?
0.14 gallons - ANSWER- What volume of human waste is used per
flush when
calculating holding tank
size?
True - ANSWER- True 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 - ANSWER- Why must careful consideration be given
to the location and routing of inlet and discharge lines for manual flush
toilets when the "shutoff" 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. - ANSWER- When and why must siphon breaks be
installed in a sewage system?
True - ANSWER- A 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 - ANSWER-
What 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 -
ANSWER-
Name four ways to separate a fresh water flushing system from potable
water system.
1.5 inches - ANSWER- What is the minimum hose ID for use on un-macerated
sewage?
Secure mounting to minimize vibration effect, use flexible hose to connect
to fitting and
hull. - ANSWER- What provisions should be made if using rigid PVC for
sewage?
linear or cross-linked polyethylene, 1/4 inch thick or greater. - ANSWER-
What plastic
material is recommended for sewage holding
tanks?
Epoxy and Vinyl Esther are ok, but polyester resin is not because of
susceptibility to osmotic blistering. - ANSWER- Of the three major type of
Fiberglass Reinforced Plastic (FRP), which one is not recommended and why?
ABYC Systems Certification Exam with Actual Questions and Answers Latest Updated 2025-2026 (Graded A+).
