ABYC Systems Certification Exam Review || with Errorless
Solutions 100%.
What is the most often used materials for potable water systems? correct answers Polyethylene
Name 5 materials allowable for contact use in potable water systems: correct answers 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? correct answers
Siphon Break
What is the device used to maintain a stable pressure and minimize pump cycling, and where
should it be located? correct answers Accumulator Tank, after pump/filter and before check-
valve
At what what percentage of nominal working pressure shall the relief valve be set? correct
answers 175%
Is a standard household type relief valve acceptable for hot water tanks? correct answers 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? correct answers nominal working pressure, not to exceed 80
PSI
Where shall the storage tank be vented? correct answers overboard
What is the maximum allowable pressure to which the storage tank and vent system be
subjected? correct answers 3 PSI or mnfg's maximum, which ever is greater.
What temperate range is required for pumps to be able to tolerate exposure? correct answers -40
°F to +140 °F
When operating at an ambient temperature of 140 F, what is the max allowable surface
temperature of a pump? correct answers 257 F
Potable water systems must be equipped with a drain. T or F? correct answers True
Storage tank inlet may also serve as the tank vent. T or F? correct answers False
Storage tank inlet caps must be retained to prevent loss. T or F? correct answers True
,Storage tanks must be equipped with a vent. T or F? correct answers True
Storage tank vent may be used for filling purposes. T or F? correct answers True
What rate of static pressure must a storage tank withstand? correct answers 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? correct answers 3 PSI
Each desalinator must be equipped with an automatic shutoff salinity detector. T or F? correct
answers True
What marking must be on pipe or tubes that are not capable of handling hot water? correct
answers "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?
correct answers 125 PSI, 300 PSI
What is the max pressure relief valve setting for hot water tanks? correct answers 175 PSI
What is the max temperature relief setting for hot water tanks? correct answers 210 F
What is the max allowable water output temperature for hot water system? correct answers 125 F
All potable water system connections shall be positioned above the normal bilge water
accumulation level. T or F? correct answers True
Exposed metallic parts of a potable water system shall have provisions for electrical bonding. T
or F? correct answers True
For what reason might a holding tank collapse during pump-out? correct answers 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? correct answers 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? correct answers Type II
What type of MSD (Marine Sanitation Device) is designed to hold sewage or any waste derived
from sewage? correct answers 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? correct answers Retention
System
What is the name of the system that includes all sanitation equipment and fittings designed to
receive, treat, vent and discharge sewage? correct answers Treatment System
What is another name for a vented loop that prevents back siphoning by breaking suction yet
allowing normal flow when pressurized? correct answers Siphon break
When calculating holding tank size, how many flushes per day are included in the calculation?
correct answers 5
What volume of human waste is used per flush when calculating holding tank size? correct
answers 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. correct answers 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? correct answers
Prevention of siphoning
When and why must siphon breaks be installed in a sewage system? correct answers 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? correct answers True
What special provision must be included for a sewage y-valve when the discharge seacock is not
lockable? correct answers 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. correct
answers Air Gap, Vacuum Break, Double Check Valve, Dedicated Water Tank
What is the minimum hose ID for use on un-macerated sewage? correct answers 1.5 inches
What provisions should be made if using rigid PVC for sewage? correct answers Secure
mounting to minimize vibration effect, use flexible hose to connect to fitting and hull.
What plastic material is recommended for sewage holding tanks? correct answers linear or cross-
linked polyethylene, 1/4 inch thick or greater.
Solutions 100%.
What is the most often used materials for potable water systems? correct answers Polyethylene
Name 5 materials allowable for contact use in potable water systems: correct answers 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? correct answers
Siphon Break
What is the device used to maintain a stable pressure and minimize pump cycling, and where
should it be located? correct answers Accumulator Tank, after pump/filter and before check-
valve
At what what percentage of nominal working pressure shall the relief valve be set? correct
answers 175%
Is a standard household type relief valve acceptable for hot water tanks? correct answers 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? correct answers nominal working pressure, not to exceed 80
PSI
Where shall the storage tank be vented? correct answers overboard
What is the maximum allowable pressure to which the storage tank and vent system be
subjected? correct answers 3 PSI or mnfg's maximum, which ever is greater.
What temperate range is required for pumps to be able to tolerate exposure? correct answers -40
°F to +140 °F
When operating at an ambient temperature of 140 F, what is the max allowable surface
temperature of a pump? correct answers 257 F
Potable water systems must be equipped with a drain. T or F? correct answers True
Storage tank inlet may also serve as the tank vent. T or F? correct answers False
Storage tank inlet caps must be retained to prevent loss. T or F? correct answers True
,Storage tanks must be equipped with a vent. T or F? correct answers True
Storage tank vent may be used for filling purposes. T or F? correct answers True
What rate of static pressure must a storage tank withstand? correct answers 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? correct answers 3 PSI
Each desalinator must be equipped with an automatic shutoff salinity detector. T or F? correct
answers True
What marking must be on pipe or tubes that are not capable of handling hot water? correct
answers "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?
correct answers 125 PSI, 300 PSI
What is the max pressure relief valve setting for hot water tanks? correct answers 175 PSI
What is the max temperature relief setting for hot water tanks? correct answers 210 F
What is the max allowable water output temperature for hot water system? correct answers 125 F
All potable water system connections shall be positioned above the normal bilge water
accumulation level. T or F? correct answers True
Exposed metallic parts of a potable water system shall have provisions for electrical bonding. T
or F? correct answers True
For what reason might a holding tank collapse during pump-out? correct answers 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? correct answers 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? correct answers Type II
What type of MSD (Marine Sanitation Device) is designed to hold sewage or any waste derived
from sewage? correct answers 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? correct answers Retention
System
What is the name of the system that includes all sanitation equipment and fittings designed to
receive, treat, vent and discharge sewage? correct answers Treatment System
What is another name for a vented loop that prevents back siphoning by breaking suction yet
allowing normal flow when pressurized? correct answers Siphon break
When calculating holding tank size, how many flushes per day are included in the calculation?
correct answers 5
What volume of human waste is used per flush when calculating holding tank size? correct
answers 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. correct answers 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? correct answers
Prevention of siphoning
When and why must siphon breaks be installed in a sewage system? correct answers 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? correct answers True
What special provision must be included for a sewage y-valve when the discharge seacock is not
lockable? correct answers 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. correct
answers Air Gap, Vacuum Break, Double Check Valve, Dedicated Water Tank
What is the minimum hose ID for use on un-macerated sewage? correct answers 1.5 inches
What provisions should be made if using rigid PVC for sewage? correct answers Secure
mounting to minimize vibration effect, use flexible hose to connect to fitting and hull.
What plastic material is recommended for sewage holding tanks? correct answers linear or cross-
linked polyethylene, 1/4 inch thick or greater.
