ABYC Systems Certification Exam Review
UPDATED ACTUAL Questions and
CORRECT Answers
175% - CORRECT ANSWER - At what what percentage of nominal working pressure
shall the relief valve be set?
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?
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?
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?
True - CORRECT 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 - CORRECT 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. - CORRECT
ANSWER - When and why must siphon breaks be installed in a sewage system?
True - CORRECT 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 - CORRECT 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 - CORRECT
ANSWER - Name four ways to separate a fresh water flushing system from potable water
system.
1.5 inches - CORRECT ANSWER - What is the minimum hose ID for use on un-
macerated sewage?
linear or cross-linked polyethylene, 1/4 inch thick or greater. - CORRECT 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. - CORRECT ANSWER - Of the three major type of Fiberglass Reinforced
Plastic (FRP), which one is not recommended and why?
5/8 inch - CORRECT ANSWER - A removable holding tank's vent line shall be what
minimum diameter?
2X weight of tank and contents when full - CORRECT ANSWER - 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. - CORRECT
ANSWER - 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. - CORRECT ANSWER -
Why is it recommended to use plastic fittings with plastic holding tanks?
UPDATED ACTUAL Questions and
CORRECT Answers
175% - CORRECT ANSWER - At what what percentage of nominal working pressure
shall the relief valve be set?
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?
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?
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?
True - CORRECT 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 - CORRECT 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. - CORRECT
ANSWER - When and why must siphon breaks be installed in a sewage system?
True - CORRECT 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 - CORRECT 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 - CORRECT
ANSWER - Name four ways to separate a fresh water flushing system from potable water
system.
1.5 inches - CORRECT ANSWER - What is the minimum hose ID for use on un-
macerated sewage?
linear or cross-linked polyethylene, 1/4 inch thick or greater. - CORRECT 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. - CORRECT ANSWER - Of the three major type of Fiberglass Reinforced
Plastic (FRP), which one is not recommended and why?
5/8 inch - CORRECT ANSWER - A removable holding tank's vent line shall be what
minimum diameter?
2X weight of tank and contents when full - CORRECT ANSWER - 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. - CORRECT
ANSWER - 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. - CORRECT ANSWER -
Why is it recommended to use plastic fittings with plastic holding tanks?
