SHIP STABILITY BOOKLET



SHIP STABILITY BOOKLET

Aim: The aim of the stability booklet is to provide the Master with quality

Information that will enable the vessel to be loaded & operated in a safe

manner.

Approval: The stability booklet is only approved when the vessel’s required loading

conditions are shown to meet the appropriate criteria & there is sufficient data

provided to enable a competent person to evaluate additional loading

conditions.

Each Stability Booklet shall contain the following information:

1. Title page showing – “Stability Booklet” – vessel name, hull & machinery number,

revision number, date of preparation or latest amendment.

2. Table of Contents – all pages to be numbered consecutively.

3. Vessel Particulars table including:

· LOA (m): …………………….

· L Measured (m): …………………….

· B Moulded (m): …………………….

· D Moulded (m): …………………….

· LBP (m): …………………….

· T Design (m): …………………….

· Vertical Datum: …………………….

· Longitudinal Datum: …………………….

· Class of the Vessel: …………………….

· Crew Nos. : …………………….

· Passenger Nos. : …………………….

4. Notes for the vessel’s Master to include safety & ship management issues related to stability & any information regarding navigational drafts.

5. Stability Criteria – clearly stating the criteria that the vessel is shown to comply with in the booklet.

6. Standard abbreviations & symbols used in the booklet.

7. Drawing showing the profile & plan view of the vessel arrangement.

8. Drawing or table showing the longitudinal, transverse & vertical position of downflooding points, potential downflooding points, & deck edge.

9. Tank arrangement drawing & tank summary table.

10. Tank calibration tables for all tanks.

11. Windage area diagram when stability criteria includes wind heeling considerations.

12. Passenger heeling diagram showing the distribution of passengers for the calculation of passenger heeling lever, when required by stability criteria.

13. Draft mark or freeboard drawing showing the positions of draft marks or freeboard readings, the position of the baseline (vertical datum) & longitudinal datum.

14. Load line drawing (if load line vessel).

15. Determination of lightship characteristics – Inclining experiment report, lightship report, sister vessel determination.

16. Loading conditions appropriate to the vessel:

· Departure conditions shall include the maximum free surface moment for at least the day service fuel tank(s) & at least 1 FW (fresh water) tank;

· Arrival conditions shall include quantities of FO (fuel oil), FW & consumable stores corresponding to 10% of the quantities at departure. A note alerting the Master of the vessel to any tank restrictions shall be included at the beginning of the booklet.

· Notes regarding any permanent ballast fitted must be prominent & specific on the type, mass, location & method of securing.

17. Hydrostatic curves or tables – over the range of operational drafts from lightship to full load:

* (Displacement)

* LCB (Longitudinal centre of buoyancy)

* LCF (Longitudinal centre of flotation)

* MCT (Moment to change trim 1 cm)

* TPC (Tonne per cm immersion)

* KMT (Transverse distance from keel to metacentre)

18. KN curves or tables over the range of operational s, calculated by the free-trimming

method, at 10o intervals of heel.

Inclining Experiments

Inclining experiments shall be conducted in the presence of a Ship Surveyor. Maximum heel angles of 1o or less in the most heeled condition will not be accepted.

Notes Regarding Stability Criteria

If applied theoretically the Stability Booklet shall include GZ curves for departure & arrival conditions. Dynamic balance shall be achieved for the single most severe heeling lever (wind or passenger).

GZ curves shall be produced for departure & arrival conditions with the heeling levers plotted on the GZ curves. The combined heeling lever (i.e. worst 2 capsing influences applied together) shall intersect the GZ curve at any point.

Heeling Moments

Wind heeling levers may be factored by cos2 (heel angle) & rudder & passenger heeling levers factored by cos (heel angle). When calculating windage areas, side curtains required to be deployed to provide shelter for passengers in their normal seated positions shall be included in the windage area.

Heel due to the effect of the rudder when turning

Whenever it appears in the stability criteria, the heel due to the effect of the rudder when turning must be calculated regardless of the vessel’s speed to length ratio (V/L), however the value for V/L need be taken greater than 4.

Prepared by:

………………………………..

Mr Mazlan bin Muslim

Naval Architect/Ship Surveyor

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