ABYC Systems Certification EXAM WITH
CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS
LATEST ALREADY GRADED A+ (2025/2026)
Polyethylene - ,,,correct 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 - ,,,correct answer,,,,Name 5 materials
allowable for contact use in potable water systems:
Siphon Break - ,,,correct answer,,,,What device can be used to
separate potable water from other water systems?
Accumulator Tank, after pump/filter and before check-valve -
,,,correct answer,,,,What is the device used to maintain a stable
pressure and minimize pump cycling, and where should it be
located?
175% - ,,,correct 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) -
,,,correct answer,,,,Is a standard household type relief valve
acceptable for hot water tanks?
,nominal working pressure, not to exceed 80 PSI - ,,,correct
answer,,,,For the pressure reducing valve and check valve installed
after a shore water connection, what is the maximum allowable
pressure?
overboard - ,,,correct answer,,,,Where shall the storage tank be
vented?
3 PSI or mnfg's maximum, which ever is greater. - ,,,correct
answer,,,,What is the maximum allowable pressure to which the
storage tank and vent system be subjected?
-40 °F to +140 °F - ,,,correct answer,,,,What temperate range is
required for pumps to be able to tolerate exposure?
257 F - ,,,correct answer,,,,When operating at an ambient
temperature of 140 F, what is the max allowable surface
temperature of a pump?
True - ,,,correct answer,,,,Potable water systems must be equipped
with a drain. T or F?
False - ,,,correct answer,,,,Storage tank inlet may also serve as the
tank vent. T or F?
True - ,,,correct answer,,,,Storage tank inlet caps must be retained to
prevent loss. T or F?
True - ,,,correct answer,,,,Storage tanks must be equipped with a
vent. T or F?
True - ,,,correct 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. -
,,,correct answer,,,,What rate of static pressure must a storage tank
withstand?
3 PSI - ,,,correct answer,,,,What is the max pressure that a
desalinator can impart to a storage tank?
True - ,,,correct answer,,,,Each desalinator must be equipped with an
automatic shutoff salinity detector. T or F?
"For Cold Water Use Only" - ,,,correct answer,,,,What marking must
be on pipe or tubes that are not capable of handling hot water?
125 PSI, 300 PSI - ,,,correct answer,,,,What is the test pressure for
water heater tank 15 gal or less? over 15 gal but under 120 gal?
175 PSI - ,,,correct answer,,,,What is the max pressure relief valve
setting for hot water tanks?
210 F - ,,,correct answer,,,,What is the max temperature relief setting
for hot water tanks?
125 F - ,,,correct answer,,,,What is the max allowable water output
temperature for hot water system?
True - ,,,correct answer,,,,All potable water system connections shall
be positioned above the normal bilge water accumulation level. T or
F?
True - ,,,correct answer,,,,Exposed metallic parts of a potable water
system shall have provisions for electrical bonding. T or F?
, Improper venting - ,,,correct answer,,,,For what reason might a
holding tank collapse during pump-out?
Type I - ,,,correct 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 - ,,,correct 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 - ,,,correct answer,,,,What type of MSD (Marine Sanitation
Device) is designed to hold sewage or any waste derived from
sewage?
Retention System - ,,,correct 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 - ,,,correct 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 - ,,,correct answer,,,,What is another name for a vented
loop that prevents back siphoning by breaking suction yet allowing
normal flow when pressurized?
5 - ,,,correct answer,,,,When calculating holding tank size, how many
flushes per day are included in the calculation?
0.14 gallons - ,,,correct answer,,,,What volume of human waste is
used per flush when calculating holding tank size?
CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS
LATEST ALREADY GRADED A+ (2025/2026)
Polyethylene - ,,,correct 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 - ,,,correct answer,,,,Name 5 materials
allowable for contact use in potable water systems:
Siphon Break - ,,,correct answer,,,,What device can be used to
separate potable water from other water systems?
Accumulator Tank, after pump/filter and before check-valve -
,,,correct answer,,,,What is the device used to maintain a stable
pressure and minimize pump cycling, and where should it be
located?
175% - ,,,correct 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) -
,,,correct answer,,,,Is a standard household type relief valve
acceptable for hot water tanks?
,nominal working pressure, not to exceed 80 PSI - ,,,correct
answer,,,,For the pressure reducing valve and check valve installed
after a shore water connection, what is the maximum allowable
pressure?
overboard - ,,,correct answer,,,,Where shall the storage tank be
vented?
3 PSI or mnfg's maximum, which ever is greater. - ,,,correct
answer,,,,What is the maximum allowable pressure to which the
storage tank and vent system be subjected?
-40 °F to +140 °F - ,,,correct answer,,,,What temperate range is
required for pumps to be able to tolerate exposure?
257 F - ,,,correct answer,,,,When operating at an ambient
temperature of 140 F, what is the max allowable surface
temperature of a pump?
True - ,,,correct answer,,,,Potable water systems must be equipped
with a drain. T or F?
False - ,,,correct answer,,,,Storage tank inlet may also serve as the
tank vent. T or F?
True - ,,,correct answer,,,,Storage tank inlet caps must be retained to
prevent loss. T or F?
True - ,,,correct answer,,,,Storage tanks must be equipped with a
vent. T or F?
True - ,,,correct 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. -
,,,correct answer,,,,What rate of static pressure must a storage tank
withstand?
3 PSI - ,,,correct answer,,,,What is the max pressure that a
desalinator can impart to a storage tank?
True - ,,,correct answer,,,,Each desalinator must be equipped with an
automatic shutoff salinity detector. T or F?
"For Cold Water Use Only" - ,,,correct answer,,,,What marking must
be on pipe or tubes that are not capable of handling hot water?
125 PSI, 300 PSI - ,,,correct answer,,,,What is the test pressure for
water heater tank 15 gal or less? over 15 gal but under 120 gal?
175 PSI - ,,,correct answer,,,,What is the max pressure relief valve
setting for hot water tanks?
210 F - ,,,correct answer,,,,What is the max temperature relief setting
for hot water tanks?
125 F - ,,,correct answer,,,,What is the max allowable water output
temperature for hot water system?
True - ,,,correct answer,,,,All potable water system connections shall
be positioned above the normal bilge water accumulation level. T or
F?
True - ,,,correct answer,,,,Exposed metallic parts of a potable water
system shall have provisions for electrical bonding. T or F?
, Improper venting - ,,,correct answer,,,,For what reason might a
holding tank collapse during pump-out?
Type I - ,,,correct 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 - ,,,correct 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 - ,,,correct answer,,,,What type of MSD (Marine Sanitation
Device) is designed to hold sewage or any waste derived from
sewage?
Retention System - ,,,correct 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 - ,,,correct 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 - ,,,correct answer,,,,What is another name for a vented
loop that prevents back siphoning by breaking suction yet allowing
normal flow when pressurized?
5 - ,,,correct answer,,,,When calculating holding tank size, how many
flushes per day are included in the calculation?
0.14 gallons - ,,,correct answer,,,,What volume of human waste is
used per flush when calculating holding tank size?
