International Code on Intact Stability, 2008 (2008 IS Code), 2020 Edition (IC874E) (eBook)

Published Date

January 2020

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International Code on Intact Stability, 2008 (2008 IS Code), 2020 Edition (IC874E) (eBook)

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The International Code on Intact Stability, 2008 (2008 IS Code) presents mandatory and recommendatory stability criteria and other measures for ensuring the safe operation of ships, to minimize the risk to such ships, to the personnel on board and to the environment.

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The 2020 Edition features:


• an update of the 2008 IS Code, including all amendments that will have entered into force on 1 January 2020;

• minor additions and amendments to the mandatory part A of the Code;

• amendments to the Code’s recommendatory part B, including substantial additions to chapter 2 on Recommended design criteria for certain types of ships and chapter 3 on Guidance in preparing stability information, as well as

the provision of a new annex 3;

• criteria based on the best state-of-the-art concepts available at the time they were developed; and influences on intact stability, as contained in the previous edition; and

• Explanatory Notes and the Unified Interpretations to the 2008 IS Code.

This publication should be of interest to maritime administrations, ship manufacturers, shipping companies, education institutes and others concerned with intact stability criteria.

Resolution MSC.267(85) (adopted on 4 December 2008)





1 Purpose

2 Definitions


Part A – Mandatory criteria


Chapter 1 – General

1.1 Application

1.2 Dynamic stability phenomena in waves


Chapter 2 – General criteria

2.1 General

2.2 Criteria regarding righting lever curve properties

2.3 Severe wind and rolling criterion (weather criterion)


Chapter 3 – Special criteria for certain types of ships

3.1 Passenger ships

3.2 Oil tankers of 5,000 tonnes deadweight and above

3.3 Cargo ships carrying timber deck cargoes

3.4 Cargo ships carrying grain in bulk

3.5 High-speed craft


Part B – Recommendations for certain types of ships and additional guidelines


Chapter 1 – General

1.1 Purpose

1.2 Application


Chapter 2 – Recommended design criteria for certain types of ships

2.1 Fishing vessels

2.2 Pontoons

2.3 Containerships greater than 100 m

2.4 Offshore supply vessels

2.5 Special purpose ships

2.6 Mobile offshore drilling units (MODUs)


Chapter 3 – Guidance in preparing stability information

3.1 Effect of free surfaces of liquids in tanks

3.2 Permanent ballast

3.3 Assessment of compliance with stability criteria

3.4 Standard conditions of loading to be examined

3.5 Calculation of stability curves

3.6 Stability booklet

3.7 Operational measures for ships carrying timber deck cargoes

3.8 Operating booklets for certain ships


Chapter 4 – Stability calculations performed by stability instruments

4.1 Stability instruments


Chapter 5 – Operational provisions against capsizing

5.1 General precautions against capsizing

5.2 Operational precautions in heavy weather

5.3 Ship handling in heavy weather


Chapter 6 – Icing considerations

6.1 General

6.2 Cargo ships carrying timber deck cargoes

6.3 Fishing vessels

6.4 Offshore supply vessels 24 m to 100 m in length


Chapter 7 – Considerations for watertight and weathertight integrity

7.1 Hatchways

7.2 Machinery space openings

7.3 Doors

7.4 Cargo ports and other similar openings

7.5 Sidescuttles, window scuppers, inlets and discharges

7.6 Other deck openings

7.7 Ventilators, air pipes and sounding devices

7.8 Freeing ports

7.9 Miscellaneous


Chapter 8 – Determination of lightship parameters

8.1 Application

8.2 Preparations for the inclining test

8.3 Plans required

8.4 Test procedure

8.5 Inclining test for MODUs

8.6 Stability test for pontoons


Annex 1 – Detailed guidance for the conduct of an inclining test

1 Introduction

2 Preparations for the inclining test

2.1 Free surface and tankage

2.2 Mooring arrangements

2.3 Test weights

2.4 Pendulums

2.5 U-tubes

2.6 Inclinometers

3 Equipment required

4 Test procedure

4.1 Initial walk-through and survey

4.2 Freeboard/draught readings

4.3 The incline


Annex 2 – Recommendations for skippers of fishing vessels on ensuring a vessel’s endurance in conditions of ice formation

1 Prior to departure

2 At sea

3 During ice formation

4 List of equipment and hand tools

A​​s a specialized agency of the United Nations, IMO is the global standard-setting authority for the safety, security and environmental performance of international shipping. Its main role is to create a regulatory framework for the shipping industry that is fair and effective, universally adopted and universally implemented.  

In other words, its role is to create a level playing-field so that ship operators cannot address their financial issues by simply cutting corners and compromising on safety, security and environmental performance. This approach also encourages innovation and efficiency.

Shipping is a truly international industry, and it can only operate effectively if the regulations and standards are themselves agreed, adopted and implemented on an international basis. And IMO is the forum at which this process takes place.

Title: International Code on Intact Stability, 2008 (2008 IS Code), 2020 Edition (IC874E) (eBook)
Number of Pages: 162
Product Code: MM1486EA
Published Date: January 2020
Binding Format: Paperback
Book Height: 210 mm
Book Width: 150 mm
Book Spine: 7 mm
Author: IMO

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