Module 2C: Subdivision & Stability

Scope of training

The participant who has completed the module will be able to understand:

Intact and damage stability;
Inclining test assessment;
Grain loading stability; and
Watertight and weathertight integrity.

EVALUATION CRITERIA AND PASS REQUIREMENTS

The assessment methods will be to choose the best answer from a selection of alternatives.

In the method of objective evaluation, only be accepted one correct answer is valid, and never more than one selection within the same question since they will be automatically considered incorrect. The participants approve the course with a score equal to or greater than 70% of the total value of the assessment. All evaluations will be based on a Total Score of 100.

MODULE 2C – Subdivision & Stability

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Exam Questions

1. The purpose of the International Code on Intact Stability (2008 IS Code) is to present mandatory and recommendatory stability criteria and other measures for ensuring the safe operation of ships, minimizing the risk to such ships, to the personnel on board, and to the environment. 2008 IS Code contains intact stability criteria for the following types of ships and other marine vehicles of 24m in length and above unless otherwise stated: Cargo ships; Cargo ships carrying timber deck cargoes; Passenger ships; Fishing vessels; Special Purpose Ships; Offshore Supply Vessels; Mobile Offshore Drilling Units; Pontoons; and Cargo ships carrying containers on deck and Container ships.

True

False

2. Certification of the inclining test weights is the verification of the weight marked on a test weight. Test weights should be certified using a certificated scale. The weighing should be performed close enough in time to the inclining test to ensure the measured weight is accurate.

True

False

3. The inclining test involves moving a series of known weights, normally in the transverse direction and then measuring the resulting change in the equilibrium heel angle of the ship. By using this information and applying basic naval architecture principles, the ship's vertical center of gravity (VGC) is determined.

True

False

4. Lightship condition is a ship complete in all respects, but without consumables, stores, cargo, crew and effects, and without any liquids on board except that machinery and piping fluids, such as lubricants and hydraulics, are at operating levels.

True

False

5. Stability instrument is an instrument installed on board a particular ship by means of which it can be ascertained that stability requirements specified for the ship in the Stability Booklet are met in any operational loading condition. A Stability Instrument comprises hardware and software.

True

False

6. Each ship shall be provided with a stability booklet, approved by the Administration, to enable the master to operate the ship in compliance with the applicable requirements contained in the 2008 IS Code. If a stability instrument is used as a supplement to the stability booklet for the purpose of determining compliance with the relevant stability criteria such instrument shall be subject to the approval by the Administration.

True

False

7. Minimum weight of 75kg shall be assumed for each passenger except that this value may be increased subject to the approval of the Administration. In addition, the mass and distribution of the luggage shall be approved by the Administration. The height of the center of gravity for passengers shall be assumed equal to:

1 m above deck level for passengers standing upright. Account may be taken, if necessary, of camber and sheer of deck; and

0.3 m above the seat in respect of seated passengers.

All of the above

8. The special criteria for Oil tankers of 5,000 dwt and above shall comply with regulation 27 of Annex I to MARPOL 73/78.

True

False

9. The intact stability of ships engaged in the carriage of grain shall comply with the requirements of the International Code for the Safe Carriage of Grain in Bulk adopted by resolution MSC.23(59), as amended

True

False

10. Procedures followed in conducting the inclining test and lightweight survey should be in accordance with the recommendations laid out in annex 1 (Detailed guidance for the conduct of an inclining test) to 2008 IS Code including:

Freeboard/draught readings should be taken to establish the position of the waterline in order to determine the displacement of the ship at the time of the inclining test. It is recommended that at least five freeboard readings, approximately equally spaced, be taken on each side of the ship or that all draught marks (forward, midship and aft) be read on each side of the ship. Draught/ freeboard readings should be read immediately before or immediately after the inclining test.

The standard test employs eight distinct weight movements. Movement No.8, a recheck of the zero point, may be omitted if a straight line plot is achieved after movement No.7. If a straight line plot is achieved after the initial zero and six weight movements, the inclining test is complete and the second check at zero may be omitted. If a straight line plot is not achieved, those weight movements that did not yield acceptable plotted points should be repeated or explained.

All of the above

11. Every passenger ship regardless of size and every cargo ship having a length (L) of 24 m and upwards, shall be inclined upon its completion and the elements of its stability determined. In addition to any other applicable requirements of the present regulations, ships having a length of 24 m and upwards constructed on or after 1 July 2010 shall as a minimum comply with the requirements of part A of the 2008 IS Code.

True

False

12. At periodical intervals not exceeding five years, a lightweight survey shall be carried out on all passenger ships to verify any changes in lightship displacement and longitudinal centre of gravity.

True

False

13. Stability information to be supplied to the master should include:

curves or tables of minimum operational metacentric height (GM) versus draught which assures compliance with the relevant intact and damage stability requirements, alternatively corresponding curves or tables of the maximum allowable vertical centre of gravity (KG) versus draught, or with the equivalents of either of these curves;

instructions concerning the operation of cross-flooding arrangements; and

all other data and aids which might be necessary to maintain the required intact stability and stability after damage

All of the above

14. Double bottoms in passenger ships and cargo ships other than tankers shall be fitted extending from the collision bulkhead to the afterpeak bulkhead, as far as this is practicable and compatible with the design and proper working of the ship.

True

False

15. Testing watertight spaces not intended to hold liquids and cargo holds intended to hold ballast by filling them with water is not compulsory.

True

False

16. The freeboard corresponding to each approved subdivision load line and the service configuration, for which it is approved, shall be clearly indicated on the Passenger Ship Safety Certificate. In no case shall any subdivision load line mark be placed above the deepest load line in salt water as determined by the strength of the ship or the International Convention on Load Lines in force.

True

False

17. There shall be permanently exhibited, or readily available on the navigation bridge, for the guidance of the officer in charge of the ship, plans showing clearly for each deck and hold the boundaries of the watertight compartments, the openings therein with the means of closure and position of any controls thereof, and the arrangements for the correction of any list due to flooding. In addition, booklets containing the aforementioned information shall be made available to the officers of the ship.

True

False

18. In all ships:

the design, materials and construction of all watertight doors, sidescuttles, gangway and cargo ports, valves, pipes, ash-chutes and rubbish-chutes referred to in these regulations shall be to the satisfaction of the Administration;

such valves, doors and mechanisms shall be suitably marked to ensure that they may be properly used to provide maximum safety; and

the frames of vertical watertight doors shall have no groove at the bottom in which dirt might lodge and prevent the door closing properly.

All of the above

19. Watertight doors or ramps fitted to internally subdivide large cargo spaces shall be closed before the voyage commences and shall be kept closed during navigation; the time of opening such doors in port and of closing them before the ship leaves port shall be entered in the logbook. The use of access doors and hatch covers intended to ensure the watertight integrity of internal openings shall be authorized by the officer of the watch.

True

False

20. Water level detectors on single hold cargo ships other than bulk carriers shall:

an audible and visual alarm at the navigation bridge when the water level above the inner bottom in the cargo hold reaches a height of not less than 0.3 m, and another when such level reaches not more than 15% of the mean depth of the cargo hold; and

be fitted at the aft end of the hold, or above its lowest part where the inner bottom is not parallel to the designed waterline. Where webs or partial watertight bulkheads are fitted above the inner bottom, Administrations may require the fitting of additional detectors.

All of the above