International Convention on Load Lines

Question 1

Define the difference between weathertight and watertight?

Answer 1

WEATHERTIGHT means that in any
sea conditions water will not penetrate into the ship.

Watertight means “capable of preventing the passage of water through the structure”.

Question 2

What does ILLC stand for?

Answer 2

International Load Line Certificate/Convention

Question 3

What are 3 ILLC surveys and how often are they carried out?

Answer 3

Initial Survey - Completed before the ship is put in service.

Renewal Survey - Intervals not exceeding 5 years.

Annual Survey - 3 months either side of Annual Anniversary date. Annual Survey is also known as Periodical Inspection.

Question 4

What is carried out in the ILLC Initial Survey?

Answer 4

• Examination of the ship’s structure, both internally and externally.
• Examination of all fittings and appliances for the protection of openings giving access to spaces below the freeboard and superstructure decks.
• Examination of the stability, loading and ballasting information.
• All necessary data required for the computation of the freeboard.
• Surveyor will carry out any tests as he considers necessary to ascertain the above.

Question 5

What items are given particular attention in the ILLC Annual Surveys?

Answer 5

• Hatchways
• Openings in the ships side below the freeboard.
• Freeing port shutters
• Ventilators and air pipes.
• Position of load line marks and deck line.

Question 6

what information is included on an ILLC?

Answer 6

• Name of ship;
• Official number;
• Port of registry; length;
• Type of ship (type A, B, C modified, etc.);
• Freeboards from deck line;
• Positions of load lines;
• Fresh water allowance;
• Position of deck line;
• Diagram of load lines assigned;
• Date of initial survey;
• Date periodical survey due each year;
• Certifying statement;
• Date certificate valid until;
• Place and date of issue;
• Signature of person issuing certificate (e.g. Secretary of classification society) with declaration that he is duly authorised by the UK Government.

Question 7

What are the 6 abbreviations on a load line marking

Answer 7

TF - Tropical fresh water
F - Fresh water, summer zone
T - Tropical salt water
S - Summer zone, salt water
W - Winter zone, salt water
WNA - Winter North Atlantic

Question 8

What is the floodable length?

Answer 8

The floodable length is the maximum portion of the length of a ship that can be flooded without the ship being submerged below the margin line.

Question 9

What is the Margin Line?

Answer 9

The margin line is a line drawn at least 76mm below the upper surface of the bulkhead deck, at the side of the ship.

Question 10

What is meant by the term, Reserve of Buoyancy?

Answer 10

The reserve of the Buoyancy is the volume of the enclosed spaces above the waterline.

Question 11

What do the following Stability terms mean. K, G, KG, B, KB, M, KM, GM, BM, GZ?

Answer 11

K - The keel

G - Centre of Gravity

KG - Distance from the keel to the vertical centre of gravity is known.

B - Centre of Buoyancy

KB - Distance from the keel to the centre of buoyancy.

M - Metacentre and is the point around which the vessel inlines.

KM - Height of the metacentre above the keel

GM - Metacentre Height, distance between the centre of gravity and the metacentre.

BM - Metacentre Radius, distance of centre of buoyancy to metacentre.

GZ - The perpendicular distance between the weight vector and the buoyancy vector is known as the righting arm or righting lever