ABYC Marine Systems 2022-2023
Questions With Correct Detailed
Answers.
1. What is the most often used material for a potable water system? - ANSWER-
Polyethylene
. Name 5 materials allowable for contact use in potable water systems: - ANSWER- 1.
Copper Alloys (incl. bronze, brass and nickelcopper) 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 a water heater 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?r - 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 a 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 °
When operating at an ambient temperature of 140 F, what is the max allowable surface
temperature of a pump? - ANSWER- 257 F
A potable water systems tank must be equipped with a drain. T or F? - ANSWER- True
,. Storage tank inlets 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 vents may be used for filling purposes. T or F? - ANSWER- False
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 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
What provisions should be made if using rigid PVC for sewage? - ANSWER- Secure
mounting to minimize vibration effect, use flexible hose to connect to fitting and hull.
Questions With Correct Detailed
Answers.
1. What is the most often used material for a potable water system? - ANSWER-
Polyethylene
. Name 5 materials allowable for contact use in potable water systems: - ANSWER- 1.
Copper Alloys (incl. bronze, brass and nickelcopper) 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 a water heater 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?r - 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 a 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 °
When operating at an ambient temperature of 140 F, what is the max allowable surface
temperature of a pump? - ANSWER- 257 F
A potable water systems tank must be equipped with a drain. T or F? - ANSWER- True
,. Storage tank inlets 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 vents may be used for filling purposes. T or F? - ANSWER- False
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 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
What provisions should be made if using rigid PVC for sewage? - ANSWER- Secure
mounting to minimize vibration effect, use flexible hose to connect to fitting and hull.
