ABYC Systems Certification Exam
Review Questions With Complete
Solutions
What is the most often used materials for potable water systems? - Answer-
Polyethylene
/.Name 5 materials allowable for contact use in potable water systems: - Answer-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
/.What device can be used to separate potable water from other water systems? -
Answer-Siphon Break
/.What is the device used to maintain a stable pressure and minimize pump cycling, and
where should it be located? - Answer-Accumulator Tank, after pump/filter and before
check-valve
/.At what what percentage of nominal working pressure shall the relief valve be set? -
Answer-175%
/.Is a standard household type relief valve acceptable for hot water tanks? - Answer-No,
typically these are too high (up to 400% of nominal pressure)
/.For the pressure reducing valve and check valve installed after a shore water
connection, what is the maximum allowable pressure? - Answer-nominal working
pressure, not to exceed 80 PSI
/.Where shall the storage tank be vented? - Answer-overboard
/.What is the maximum allowable pressure to which the storage tank and vent system
be subjected? - Answer-3 PSI or mnfg's maximum, which ever is greater.
/.What temperate range is required for pumps to be able to tolerate exposure? -
Answer--40 °F to +140 °F
/.When operating at an ambient temperature of 140 F, what is the max allowable
surface temperature of a pump? - Answer-257 F
/.Potable water systems must be equipped with a drain. T or F? - Answer-True
,/.Storage tank inlet may also serve as the tank vent. T or F? - Answer-False
/.Storage tank inlet caps must be retained to prevent loss. T or F? - Answer-True
/.Storage tanks must be equipped with a vent. T or F? - Answer-True
/.Storage tank vent may be used for filling purposes. T or F? - Answer-True
/.What rate of static pressure must a storage tank withstand? - Answer-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.
/.What is the max pressure that a desalinator can impart to a storage tank? - Answer-3
PSI
/.Each desalinator must be equipped with an automatic shutoff salinity detector. T or F?
- Answer-True
/.What marking must be on pipe or tubes that are not capable of handling hot water? -
Answer-"For Cold Water Use Only"
/.What is the test pressure for water heater tank 15 gal or less? over 15 gal but under
120 gal? - Answer-125 PSI, 300 PSI
/.What is the max pressure relief valve setting for hot water tanks? - Answer-175 PSI
/.What is the max temperature relief setting for hot water tanks? - Answer-210 F
/.What is the max allowable water output temperature for hot water system? - Answer-
125 F
/.All potable water system connections shall be positioned above the normal bilge water
accumulation level. T or F? - Answer-True
/.Exposed metallic parts of a potable water system shall have provisions for electrical
bonding. T or F? - Answer-True
/.For what reason might a holding tank collapse during pump-out? - Answer-Improper
venting
/.What type of MSD (Marine Sanitation Device) discharges effluent with fecal coliform
bacteria count <= 1,000 (per 100 ml) and no suspended solids? - Answer-Type I
, /.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? -
Answer-Type II
/.What type of MSD (Marine Sanitation Device) is designed to hold sewage or any
waste derived from sewage? - Answer-Type III
/.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? - Answer-
Retention System
/.What is the name of the system that includes all sanitation equipment and fittings
designed to receive, treat, vent and discharge sewage? - Answer-Treatment System
/.What is another name for a vented loop that prevents back siphoning by breaking
suction yet allowing normal flow when pressurized? - Answer-Siphon break
/.When calculating holding tank size, how many flushes per day are included in the
calculation? - Answer-5
/.What volume of human waste is used per flush when calculating holding tank size? -
Answer-0.14 gallons
/.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. - Answer-True
/.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? - Answer-Prevention of siphoning
/.When and why must siphon breaks be installed in a sewage system? - Answer-
Whenever components are installed below the max heeled water line - to prevent back
flow into the vessel or unintentional siphoning of untreated effluent overboard.
/.A seacock may be installed instead of a siphon break to prevent discharge and back
siphoning. T or F? - Answer-True
/.What special provision must be included for a sewage y-valve when the discharge
seacock is not lockable? - Answer-The handle must be lockable in the direction of the
holding tank
/.Name four ways to separate a fresh water flushing system from potable water system.
- Answer-Air Gap, Vacuum Break, Double Check Valve, Dedicated Water Tank
/.What is the minimum hose ID for use on un-macerated sewage? - Answer-1.5 inches
Review Questions With Complete
Solutions
What is the most often used materials for potable water systems? - Answer-
Polyethylene
/.Name 5 materials allowable for contact use in potable water systems: - Answer-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
/.What device can be used to separate potable water from other water systems? -
Answer-Siphon Break
/.What is the device used to maintain a stable pressure and minimize pump cycling, and
where should it be located? - Answer-Accumulator Tank, after pump/filter and before
check-valve
/.At what what percentage of nominal working pressure shall the relief valve be set? -
Answer-175%
/.Is a standard household type relief valve acceptable for hot water tanks? - Answer-No,
typically these are too high (up to 400% of nominal pressure)
/.For the pressure reducing valve and check valve installed after a shore water
connection, what is the maximum allowable pressure? - Answer-nominal working
pressure, not to exceed 80 PSI
/.Where shall the storage tank be vented? - Answer-overboard
/.What is the maximum allowable pressure to which the storage tank and vent system
be subjected? - Answer-3 PSI or mnfg's maximum, which ever is greater.
/.What temperate range is required for pumps to be able to tolerate exposure? -
Answer--40 °F to +140 °F
/.When operating at an ambient temperature of 140 F, what is the max allowable
surface temperature of a pump? - Answer-257 F
/.Potable water systems must be equipped with a drain. T or F? - Answer-True
,/.Storage tank inlet may also serve as the tank vent. T or F? - Answer-False
/.Storage tank inlet caps must be retained to prevent loss. T or F? - Answer-True
/.Storage tanks must be equipped with a vent. T or F? - Answer-True
/.Storage tank vent may be used for filling purposes. T or F? - Answer-True
/.What rate of static pressure must a storage tank withstand? - Answer-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.
/.What is the max pressure that a desalinator can impart to a storage tank? - Answer-3
PSI
/.Each desalinator must be equipped with an automatic shutoff salinity detector. T or F?
- Answer-True
/.What marking must be on pipe or tubes that are not capable of handling hot water? -
Answer-"For Cold Water Use Only"
/.What is the test pressure for water heater tank 15 gal or less? over 15 gal but under
120 gal? - Answer-125 PSI, 300 PSI
/.What is the max pressure relief valve setting for hot water tanks? - Answer-175 PSI
/.What is the max temperature relief setting for hot water tanks? - Answer-210 F
/.What is the max allowable water output temperature for hot water system? - Answer-
125 F
/.All potable water system connections shall be positioned above the normal bilge water
accumulation level. T or F? - Answer-True
/.Exposed metallic parts of a potable water system shall have provisions for electrical
bonding. T or F? - Answer-True
/.For what reason might a holding tank collapse during pump-out? - Answer-Improper
venting
/.What type of MSD (Marine Sanitation Device) discharges effluent with fecal coliform
bacteria count <= 1,000 (per 100 ml) and no suspended solids? - Answer-Type I
, /.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? -
Answer-Type II
/.What type of MSD (Marine Sanitation Device) is designed to hold sewage or any
waste derived from sewage? - Answer-Type III
/.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? - Answer-
Retention System
/.What is the name of the system that includes all sanitation equipment and fittings
designed to receive, treat, vent and discharge sewage? - Answer-Treatment System
/.What is another name for a vented loop that prevents back siphoning by breaking
suction yet allowing normal flow when pressurized? - Answer-Siphon break
/.When calculating holding tank size, how many flushes per day are included in the
calculation? - Answer-5
/.What volume of human waste is used per flush when calculating holding tank size? -
Answer-0.14 gallons
/.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. - Answer-True
/.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? - Answer-Prevention of siphoning
/.When and why must siphon breaks be installed in a sewage system? - Answer-
Whenever components are installed below the max heeled water line - to prevent back
flow into the vessel or unintentional siphoning of untreated effluent overboard.
/.A seacock may be installed instead of a siphon break to prevent discharge and back
siphoning. T or F? - Answer-True
/.What special provision must be included for a sewage y-valve when the discharge
seacock is not lockable? - Answer-The handle must be lockable in the direction of the
holding tank
/.Name four ways to separate a fresh water flushing system from potable water system.
- Answer-Air Gap, Vacuum Break, Double Check Valve, Dedicated Water Tank
/.What is the minimum hose ID for use on un-macerated sewage? - Answer-1.5 inches
