ABYC SYSTEMS CERTIFICATION 2026 EXAMINERS
QUESTIONS AND ANSWERS SURE A+
✔✔175 PSI - ✔✔What is the max pressure relief valve setting for hot water tanks?
✔✔210 F - ✔✔What is the max temperature relief setting for hot water tanks?
✔✔125 F - ✔✔What is the max allowable water output temperature for hot water
system?
✔✔True - ✔✔All potable water system connections shall be positioned above the
normal bilge water accumulation level. T or F?
✔✔True - ✔✔Exposed metallic parts of a potable water system shall have provisions for
electrical bonding. T or F?
✔✔Improper venting - ✔✔For what reason might a holding tank collapse during pump-
out?
✔✔Type I - ✔✔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 - ✔✔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 - ✔✔What type of MSD (Marine Sanitation Device) is designed to hold
sewage or any waste derived from sewage?
✔✔Retention System - ✔✔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 - ✔✔What is the name of the system that includes all sanitation
equipment and fittings designed to receive, treat, vent and discharge sewage?
✔✔Siphon break - ✔✔What is another name for a vented loop that prevents back
siphoning by breaking suction yet allowing normal flow when pressurized?
✔✔5 - ✔✔When calculating holding tank size, how many flushes per day are included in
the calculation?
✔✔0.14 gallons - ✔✔What volume of human waste is used per flush when calculating
holding tank size?
✔✔True - ✔✔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 - ✔✔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. -
✔✔When and why must siphon breaks be installed in a sewage system?
✔✔True - ✔✔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 - ✔✔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 - ✔✔Name
four ways to separate a fresh water flushing system from potable water system.
, ✔✔1.5 inches - ✔✔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. - ✔✔What provisions should be made if using rigid PVC for sewage?
✔✔linear or cross-linked polyethylene, 1/4 inch thick or greater. - ✔✔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. - ✔✔Of the three major type of Fiberglass Reinforced Plastic (FRP),
which one is not recommended and why?
✔✔5/8 inch - ✔✔A removable holding tank's vent line shall be what minimum diameter?
✔✔8 lbs - ✔✔What is the approximate weight of a gallon of sewage?
✔✔2X weight of tank and contents when full - ✔✔What safety factor shall be utilized
when determining necessary restraining forces for installation of a holding tank?
✔✔neoprene, bonded to tank surface with non-hydroscopic adhesive. - ✔✔What
material is recommended to be used to prevent chafe between metallic tanks and tank
supports, bracing, etc?
✔✔Similar coefficient of thermal expansion - helps prevent leaks. - ✔✔Why is it
recommended to use plastic fittings with plastic holding tanks?
✔✔1.5 inch, internal national pipe thread (NPT) - liquid and vapor tight. - ✔✔What type
of fitting shall be used for deck pump-out?
✔✔True - ✔✔True or False: holding tank vent line shall have a constant rise from the
top of the tank to the vent fitting and be as short as possible.
✔✔True - ✔✔Only anaerobic bacterial produce a smell. T or F?
✔✔24 inches - ✔✔What is the minimal distance allowed between a holding tank vent
fitting and any opening into an accommodation space?
✔✔True. Maceration does not reduce bacteria content. - ✔✔A macerator pump is not a
Type I, II, or III MSD.
✔✔False. - ✔✔T or F: All macerator pumps are self-priming
✔✔Diaphragm Pump - ✔✔What type of pump is used for flushing a toilet?
QUESTIONS AND ANSWERS SURE A+
✔✔175 PSI - ✔✔What is the max pressure relief valve setting for hot water tanks?
✔✔210 F - ✔✔What is the max temperature relief setting for hot water tanks?
✔✔125 F - ✔✔What is the max allowable water output temperature for hot water
system?
✔✔True - ✔✔All potable water system connections shall be positioned above the
normal bilge water accumulation level. T or F?
✔✔True - ✔✔Exposed metallic parts of a potable water system shall have provisions for
electrical bonding. T or F?
✔✔Improper venting - ✔✔For what reason might a holding tank collapse during pump-
out?
✔✔Type I - ✔✔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 - ✔✔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 - ✔✔What type of MSD (Marine Sanitation Device) is designed to hold
sewage or any waste derived from sewage?
✔✔Retention System - ✔✔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 - ✔✔What is the name of the system that includes all sanitation
equipment and fittings designed to receive, treat, vent and discharge sewage?
✔✔Siphon break - ✔✔What is another name for a vented loop that prevents back
siphoning by breaking suction yet allowing normal flow when pressurized?
✔✔5 - ✔✔When calculating holding tank size, how many flushes per day are included in
the calculation?
✔✔0.14 gallons - ✔✔What volume of human waste is used per flush when calculating
holding tank size?
✔✔True - ✔✔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 - ✔✔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. -
✔✔When and why must siphon breaks be installed in a sewage system?
✔✔True - ✔✔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 - ✔✔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 - ✔✔Name
four ways to separate a fresh water flushing system from potable water system.
, ✔✔1.5 inches - ✔✔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. - ✔✔What provisions should be made if using rigid PVC for sewage?
✔✔linear or cross-linked polyethylene, 1/4 inch thick or greater. - ✔✔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. - ✔✔Of the three major type of Fiberglass Reinforced Plastic (FRP),
which one is not recommended and why?
✔✔5/8 inch - ✔✔A removable holding tank's vent line shall be what minimum diameter?
✔✔8 lbs - ✔✔What is the approximate weight of a gallon of sewage?
✔✔2X weight of tank and contents when full - ✔✔What safety factor shall be utilized
when determining necessary restraining forces for installation of a holding tank?
✔✔neoprene, bonded to tank surface with non-hydroscopic adhesive. - ✔✔What
material is recommended to be used to prevent chafe between metallic tanks and tank
supports, bracing, etc?
✔✔Similar coefficient of thermal expansion - helps prevent leaks. - ✔✔Why is it
recommended to use plastic fittings with plastic holding tanks?
✔✔1.5 inch, internal national pipe thread (NPT) - liquid and vapor tight. - ✔✔What type
of fitting shall be used for deck pump-out?
✔✔True - ✔✔True or False: holding tank vent line shall have a constant rise from the
top of the tank to the vent fitting and be as short as possible.
✔✔True - ✔✔Only anaerobic bacterial produce a smell. T or F?
✔✔24 inches - ✔✔What is the minimal distance allowed between a holding tank vent
fitting and any opening into an accommodation space?
✔✔True. Maceration does not reduce bacteria content. - ✔✔A macerator pump is not a
Type I, II, or III MSD.
✔✔False. - ✔✔T or F: All macerator pumps are self-priming
✔✔Diaphragm Pump - ✔✔What type of pump is used for flushing a toilet?
