Exam (elaborations)
ABYC Marine systems .
- Institution
- 11 Body Systems (Anatomy & Physiology
ABYC Marine systems .
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ABYC Marine systems 2022-20231. What is the most often used material for a potable water system? - correct
answer-Polyethylene
. Name 5 materials allowable for contact use in potable water systems: - correct 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? - correct
answer-Siphon Break
What is the device used to maintain a stable pressure and minimize pump cycling, and
where should it be located? - correct 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? - correct answer-175%
Is a standard household type relief valve acceptable for hot water tanks? - correct
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 - correct answer-nominal working pressure, not
to exceed 80 PSI
Where shall the storage tank be vented? - correct answer-overboard
. What is the maximum allowable pressure to which a storage tank and vent system be
subjected? - correct answer-3 PSI or mnfg's maximum, which ever is greater.
What temperate range is required for pumps to be able to tolerate exposure? - correct
answer--40 °F to +140 °
When operating at an ambient temperature of 140 F, what is the max allowable surface
temperature of a pump? - correct answer-257 F
A potable water systems tank must be equipped with a drain. T or F? - correct answer-True
. Storage tank inlets may also serve as the tank vent. T or F? - correct answer-False
Storage tank inlet caps must be retained to prevent loss. T or F - correct answer-True
Storage tanks must be equipped with a vent. T or F? - correct answer-True
,Storage tank vents may be used for filling purposes. T or F? - correct answer-False
What rate of static pressure must a storage tank withstand? - correct 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? - correct answer-3
PSI
Each desalinator must be equipped with an automatic shutoff salinity detector. T or F? -
correct answer-True
What marking must be on pipe or tubes that are not capable of handling hot water? - correct
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? - correct answer-125 PSI, 300 PSI
What is the max temperature relief setting for hot water tanks? - correct answer-210 F
What is the max allowable water output temperature for hot water system? - correct
answer-125 F
All potable water system connections shall be positioned above the normal bilge water
accumulation level. T or F? - correct answer-True
. Exposed metallic parts of a potable water system shall have provisions for electrical
bonding. T or F? - correct answer-True
For what reason might a holding tank collapse during pump-out? - correct 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? - correct 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? - correct answer-Type
II
What type of MSD (Marine Sanitation Device) is designed to hold sewage or any waste
derived from sewage? - correct 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? - correct
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? - correct answer-Treatment System
, What is another name for a vented loop that prevents back siphoning by breaking suction yet
allowing normal flow when pressurized? - correct answer-Siphon break
When calculating holding tank size, how many flushes per day are included in the
calculation? - correct answer-5
What volume of human waste is used per flush when calculating holding tank size? - correct
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. - correct 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? - correct
answer-Prevention of siphoning
. When and why must siphon breaks be installed in a sewage system? - correct
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? - correct answer-True
. What special provision must be included for a sewage y-valve when the discharge seacock
is not lockable? - correct 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. -
correct answer-Air Gap, Vacuum Break, Double Check Valve, Dedicated Water Tank
. What is the minimum hose ID for use on un-macerated sewage? - correct answer-1.5
inches
What provisions should be made if using rigid PVC for sewage? - correct answer-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 answer-linear or
cross-linked polyethylene, 1/4 inch thick or greater
Of the three major type of Fiberglass Reinforced Plastic (FRP) resins, which one is not
recommended and why? - correct answer-Epoxy and Vinyl Esther are ok, but polyester resin
is not because of susceptibility to osmotic blistering.
A removable holding tank's vent line shall be what minimum diameter? - correct answer-5/8
inch
What is the approximate weight of a gallon of sewage? - correct answer-8 lbs
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