ABYC Systems Certification EXAM WITH CORRECT ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST ALREADY GRADED A+ (2025/2026)
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?
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?
,ABYC Systems Certification EXAM WITH CORRECT ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST ALREADY GRADED A+ (2025/2026)
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?
175 PSI - (ANSWER)What is the max pressure relief valve setting for hot water tanks?
,ABYC Systems Certification EXAM WITH CORRECT ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST ALREADY GRADED A+ (2025/2026)
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?
, ABYC Systems Certification EXAM WITH CORRECT ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST ALREADY GRADED A+ (2025/2026)
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 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 "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. - (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?
WELL DEFINED ANSWERS LATEST ALREADY GRADED A+ (2025/2026)
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?
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?
,ABYC Systems Certification EXAM WITH CORRECT ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST ALREADY GRADED A+ (2025/2026)
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?
175 PSI - (ANSWER)What is the max pressure relief valve setting for hot water tanks?
,ABYC Systems Certification EXAM WITH CORRECT ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST ALREADY GRADED A+ (2025/2026)
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?
, ABYC Systems Certification EXAM WITH CORRECT ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST ALREADY GRADED A+ (2025/2026)
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 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 "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. - (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?
