Exam (elaborations)
ABYC Marine systems (1)
ABYC Marine systems (1)
[Show more]
Seller
Follow
Content preview
ABYC Marine systems 2022-20231. What is the most often used material for a potable water system? - ANS-Polyethylene
. Name 5 materials allowable for contact use in potable water systems: - ANS-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? - ANS-Siphon
Break
What is the device used to maintain a stable pressure and minimize pump cycling, and where
should it be located? - ANS-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? -
ANS-175%
Is a standard household type relief valve acceptable for hot water tanks? - ANS-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 - ANS-nominal working pressure, not to exceed 80 PSI
Where shall the storage tank be vented? - ANS-overboard
. What is the maximum allowable pressure to which a storage tank and vent system be
subjected? - ANS-3 PSI or mnfg's maximum, which ever is greater.
What temperate range is required for pumps to be able to tolerate exposure? - ANS--40 °F to
+140 °
When operating at an ambient temperature of 140 F, what is the max allowable surface
temperature of a pump? - ANS-257 F
A potable water systems tank must be equipped with a drain. T or F? - ANS-True
. Storage tank inlets may also serve as the tank vent. T or F? - ANS-False
Storage tank inlet caps must be retained to prevent loss. T or F - ANS-True
Storage tanks must be equipped with a vent. T or F? - ANS-True
,Storage tank vents may be used for filling purposes. T or F? - ANS-False
What rate of static pressure must a storage tank withstand? - ANS-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? - ANS-3 PSI
Each desalinator must be equipped with an automatic shutoff salinity detector. T or F? -
ANS-True
What marking must be on pipe or tubes that are not capable of handling hot water? - ANS-"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? -
ANS-125 PSI, 300 PSI
What is the max temperature relief setting for hot water tanks? - ANS-210 F
What is the max allowable water output temperature for hot water system? - ANS-125 F
All potable water system connections shall be positioned above the normal bilge water
accumulation level. T or F? - ANS-True
. Exposed metallic parts of a potable water system shall have provisions for electrical bonding. T
or F? - ANS-True
For what reason might a holding tank collapse during pump-out? - ANS-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? - ANS-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? - ANS-Type II
What type of MSD (Marine Sanitation Device) is designed to hold sewage or any waste derived
from sewage? - ANS-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? - ANS-Retention System
What is the name of the system that includes all sanitation equipment and fittings designed to
receive, treat, vent and discharge sewage? - ANS-Treatment System
, What is another name for a vented loop that prevents back siphoning by breaking suction yet
allowing normal flow when pressurized? - ANS-Siphon break
When calculating holding tank size, how many flushes per day are included in the calculation? -
ANS-5
What volume of human waste is used per flush when calculating holding tank size? - ANS-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. - ANS-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? -
ANS-Prevention of siphoning
. When and why must siphon breaks be installed in a sewage system? - ANS-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? - ANS-True
. What special provision must be included for a sewage y-valve when the discharge seacock is
not lockable? - ANS-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. - ANS-Air
Gap, Vacuum Break, Double Check Valve, Dedicated Water Tank
. What is the minimum hose ID for use on un-macerated sewage? - ANS-1.5 inches
What provisions should be made if using rigid PVC for sewage? - ANS-Secure mounting to
minimize vibration effect, use flexible hose to connect to fitting and hull.
What plastic material is recommended for sewage holding tanks? - ANS-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? - ANS-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? - ANS-5/8 inch
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller lydiaomutho. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$11.38. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82265 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now