Ship Stability OOW

Published Date

August 2009


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Ship Stability OOW

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Designed as a clear, instructive guide to ship stability for anyone studying to become certified to officer of the watch (OOW) level, this text, with its easy to follow worked examples and numerous self-assessment questions is essential when studying for exams.

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This comprehensive titles covers the ship stability knowledge required for certification to Officer of the Watch level (STCW ’95). Outlining the syllabus requirements if the current SQA examination and HNC level units required for this qualification, it is designed to cover the subject matter in a straightforward, easy to follow way and includes clear worked examples and self-assessment questions throughout.

SECTION 1 INTRODUCTION

 

SECTION 2 – BASIC PRINCIPLES

 

2.1 Density, Mass and Volume

2.2 The Laws of Flotation

2.3 Simple box-shaped vessel calculations

Tutorial Questions

 

SECTION 3 – FORM COEFFICIENTS

 

3.1 Coefficient of fineness of the water-plane area (Cw)

3.2 Block Coefficient (Cb)

3.3 Midships Coefficient (Cm)

3.4 Longitudinal Prismatic Coefficient (Cp)

Tutorial Questions

 

SECTION 4 – TONNES PER CENTIMETRE IMMERSION

 

4.1 TPC Formula

4.2 Factors affecting TPC

4.3 Interpolation of hydrostatic data

4.4 Load/Discharge problems

Tutorial Questions

 

SECTION 5 – LOAD LINES

 

5.1 Factors for consideration in assigning a freeboard

5.2 Type ‘A’ and Type ‘B’ ships

5.3 Load Line dimensions

5.4 Fresh Water Allowance (FWA)

5.5 Dock Water Allowance (DWA)

5.6 Load Line Calculations

Tutorial Questions

 

SECTION 6 – CENTRE OF GRAVITY (G) AND CENTRE OF BUOYANCY (B)

 

6.1 Centre of Gravity

6.2 Effect of shifting a weight already on board

6.3 Effect of loading a weight

6.4 Effect of discharging a weight

6.5 Multiple weight problems

6.6 Centre of buoyancy (B)

Tutorial Questions

 

SECTION 7 – TRANSVERSE STATICAL STABILITY

 

7.1 Transverse Statical Stability

7.2 Righting Lever (GZ)

7.3 Moment of statical stability (Righting Moment)

7.4 Initial Transverse Metacentre

7.5 Metacentric Height (GM)

7.6 Calculating the Righting Moment at small angles of heel

Tutorial Questions

 

SECTION 8 – CONDITIONS OF STABILITY

 

8.1 Stable Condition

8.2 Neutral Condition

8.3 Unstable condition and angle of loll

Tutorial Questions

 

SECTION 9 – INITIAL TRANSVERSE METACENTRE

 

9.1 Initial Transverse metacentre explained

9.2 Calculating KM for a box-shaped vessel

9.3 Use of the metacentre diagram

9.4 To determine the final KG required to complete loading with a required GM

9.5 Factors affecting KM

Tutorial Questions

 

SECTION 10 – FREE SURFACE EFFECT

 

10.1 Free surface effect and transverse statical stability

10.2 To calculate the effect of free surface in a rectangular-shaped tank

10.3 Free surface moments

10.4 Representation of free surface data in ship's tank sounding/ullage tables

10.5 Factors influencing free surface effect

Tutorial Questions

 

SECTION 11 – CURVES OF STATICAL STABILITY (GZ CURVES)

 

11.1 Calculating GZ Values

11.2 Procedure for constructing a curve of statical stability

11.3 Information available from a curve of statical stability

11.4 Curves of statical stability for stiff and tender ships

Tutorial Questions

 

SECTION 12 – LIST

 

12.1 Calculating list caused by transverse shift of weight – the basic list triangle

12.2 Calculating list caused by transverse and vertical shift of weight – ship initially upright

12.3 Calculating the list due to a single weight being loaded or discharged

12.4 Shifting a weight already on board to bring a listed ship upright

12.5 Multiple weight problems – ship initially upright

12.6 Multiple weight problems – ship initially listed

12.7 Loading weight about the centreline to complete upright

12.8 List and free surface effect

Tutorial Questions

 

SECTION 13 – CURVES OF STATICAL STABILITY FOR VARYING CONDITIONS OF STABILITY

 

13.1 Curve of statical stability for a ship in a stable condition

13.2 Curve of statical stability for a ship in a neutral condition of stability

13.3 Curve of statical stability for a ship in an unstable condition

13.4 Curve of statical stability for a ship that is listed

13.5 Correcting an angle of loll

Tutorial Questions

 

SECTION 14 – SUSPENDED WEIGHTS

 

14.1 Effect on KG lifting a weight using ship's gear

14.2 Loading a weight using ship's lifting gear

14.3 To calculate the maximum permissible KG required prior to loading or discharging a weight to ensure that a certain list limit is not exceeded

Tutorial Questions

 

SECTION 15 – INTRODUCTION TO TRIM

 

15.1 Terms relating to ship length

15.2 Draught marks and reading the draught

15.3 Trim

15.4 Change of Trim

15.5 Moment to change trim by one centimetre (MCTC)

15.6 Formula for calculating MCTC

15.7 Longitudinal centre of flotation (LCF or F)

15.8 Calculating the final draughts when a weight is shifted

15.9 The effect of loading and discharging weights

15.10 Multiple weight problems

15.11 Weight to shift to reduce the trim by a specific amount

15.12 Weight to load to bring a ship to an even keel

15.13 Weight to transfer to reduce the deepest draught by a specific amount

Tutorial Questions

 

SECTION 16 – TRIM USING HYDROSTATIC DATA

 

16.1 True mean draught – displacement when out of trim

16.2 Calculating the true mean draught

16.3 Trim calculations using hydrostatic data

16.4 Trim by consideration of the relative positions of the LCB and LCG

Tutorial Questions

 

SECTION 17 – INCLINING EXPERIMENT

 

17.1 Calculating the KG as inclined

17.2 Calculating the lightship KG and displacement

17.3 Precautions prior to conducting the experiment

17.4 Precautions to ensure accuracy of the calculation

Tutorial Questions

 

SECTION 18 – ASSESING COMPLIANCE OF A SHIP'S LOADED CONDITION WITH IMO CRITERIA

 

18.1 Simpson's First Rule

18.2 Simpson's Second Rule

18.3 Intact stability – the relevance of area under the curve of statical stability

Tutorial Questions

 

SECTION 19 – PRACTICAL SHIP LOADING PROBLEMS

 

19.1 Introduction to loading sheet data

19.2 Practical ship load problem

Tutorial Questions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ship Stability for Deck Officers – Class 4/OOW covers the syllabus requirements of the current SQA examination and HNC level unit(s). These are offered by colleges as part of the underpinning knowledge required for certification to Officer of the Watch (OOW) level (STCW 95). This publication is designed to cover the subject content in the simplest way possible and at an assumed mathematical level that is appropriate for a learner studying independently.

Title: Ship Stability OOW
Number of Volumes: 1
Edition: First
Number of Pages: 408
Product Code: WS1037K
ISBN: ISBN 13: 978-1-905331-64-2 (9781905331642), ISBN 10: 1-905331-64-9 (1905331649)
Published Date: August 2009
Binding Format: Paperback
Book Height: 240 mm
Book Width: 190 mm
Book Spine: 20 mm
Weight: 1.30 kg
Author: Martin Rhodes

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