Assignment of Freeboard Flashcards
Why are load lines assigned to ships?
To ensure that the ship has sufficient freeboard to ride the seas in the prevailing weather conditions.
What vessels are exempt from load lines?
-Warships.
-Ships less that 24 meters.
-Existing ships less than 150 GT.
-Yachts not engaged in trade.
-Fishing vessels.
When must the MCA form of Water and Freeboard Notice be completed?
-
What is the criteria to deem a section of water a tropical zone?
-1% of wind speeds exceeds 34kts.
-1 tropical cyclone occurring once every 10 years.
What is the criteria to deem a section of water a Summer zone?
-10% of wind speeds exceeds 34kts.
What is the criteria to deem a section of water a Winter North Atlantic zone?
-60 Degrees North and above.
What is the criteria to deem a section of water a winter zone?
-All other regions.
What is Depth for freeboard?
(D) is the moulded depth at amidships, plus the freeboard deck thickness at the sides.
What is the Superstructure?
A decked structure on the freeboard deck, extending to both sides of the ship or with the side plating not being inboard of the shell plating more than 4% of the breadth.
What is the Superstructure Deck?
A deck forming the upper boundary of a superstructure.
What does the term watertight mean?
Capable of preventing the passage of water through the structure and inboard.
What does the term weathertight mean?
The sea conditions will not penetrate into the ship.
What is flush deck ship?
A deck which has no superstructure on the freeboard deck.
What is the block coefficient?
The ratio of the volume of the ship’s hull below the waterline to the total volume of a rectangular block having the same length, breadth, and depth as the hull.
What is amidships?
the middle of the vessels length.
Summarise the stability and stress information that must be provided to the master of a ship assigned load lines under ICLL.
-The master of every new ship shall be supplied with information to arrange
for the loading and ballasting of his ship.
-Information shall be provided to the master in a form that is approved by the
Administration or a recognised organization.
-Where any alterations are made to a ship so as to materially affect the loading
or stability information supplied to the master, amended information shall be
provided.
- ships exempt from an incline test should carry on board at all times its approved stability information together
with evidence that the information has been approved by the
Administration.
What are position 1 and position 2 under the ICLL?
P1- Upon exposed freeboard deck and raised quarter-decks and upon exposed superstructure decks located in the first quarter length of the vessel.
p2- Upon any exposed superstructure deck in the aft three-quarter length of the vessel.
What is the minimum heights of coamings at P1 and P2?
P1-600mm
P2-450mm
What is a Type A ship?
-Designed to carry liquid cargos in bulk.
-High integrity of exposed deck with only small access openings.
-Low permeability of loaded cargo components.
What is a Type B ship?
All ships other than Type A.
What are the additional construction features for B-60 and B-100?
-Ship must be over 100m.
-Protection for the crew on the exposed deck.
-Arrangements for freeing water off of the deck.
-All hatch covers should be made with steel and have adequate strength, sealing and securing.
-Over 150 meters should have some form of loading software.
-Over 20 years freeboard allocation should be revaluated.