What is code on Intact Stability?

Code on intact stability  has been assembled to provide,  in a single document,   recommended   provisions  relating to intact  stability,  based primarily  on existing  IMO  instruments.  Where  recommendations   in this Code  appear to differ from  other  IMO  Codes, such as the MODU   Code or DSC Code, the other  Codes should  be taken as the prevailing  instrument.

Purpose of the code on intact  stability:

The purpose  of the Code on Intact Stability for All Types of Ships Covered  by IMO  Instruments,  hereinafter referred   to  as the  Code,  is to  recommend    stability  criteria   and  other   measures  for  ensuring  the  safe operation  of all ships to minimize  the risk to such ships, to the personnel  on board  and to the environment.

This Code contains intact stability criteria for the following  types of ships and other  marine vehicles of 24  m in length  and above  unless otherwise  stated:

  • Cargo ships.
  • Cargo ships carrying
  • Deck  cargo cargo  ships carrying  grain in bulk .
  • Passenger
  • Fishing vessels.
  • Special purpose ships
  • Offshore   supply  vessels .
  • Mobile offshore  drilling  units
  • Pontoons
  • Dynamically supported  craft
  • Containerships

 The coastal State may impose  additional  requirements  regarding  the design aspects of ships of novel design or ships not  otherwise  covered  by the Code
Stability  data and associated  plans should  be drawn  up in the official  language  or languages  of the issuing country  and the language of the master. If the languages used are neither  English nor French the text should  include  a translation  into  one of these languages.

 Each ship  should  be  provided   with   a  stability  booklet,   approved   by  the  Administration,    which contains  sufficient  information   to enable  the master to operate  the ship in compliance   with  the applicable requirements  contained  in the Code.

  1. A general  description   of the ship;
  2. Instructions  on the use of the booklet;
  3. General  arrangement   plans  showing  watertight   compartments,    closures,  vents,  downflooding angles, permanent   ballast, allowable  deck  loadings  and freeboard  diagrams;
  4. Hydrostatic  curves or tables and cross curves of stability  calculated  on a free-trimming   basis, for the  ranges of displacement   and trim  anticipated   in normal  operating  conditions;
  5. Capacity  plan or tables showing  capacities and centres of gravity for each cargo stowage  space;
  6. Tank sounding  tables showing  capacities,  centres of gravity, and free surface data for each tank;
  7. Information   on  loading  restrictions,  such as maximum  KG or minimum   GM  curve  or table  that can be used to determine  compliance   with  the applicable  stability  criteria;
  8. Standard operating  conditions  and examples for developing  other  acceptable  loading  conditions using the information   contained   in the stability  booklet;
  9. A brief  description   of the stability  calculations  done,  including  assumptions;
  10. General  precautions  for  preventing  unintentional   flooding;
  11. Information   concerning  the use of any special cross-flooding  fittings with  descriptions  of damage conditions  which  may require  cross-flooding;
  12. Any other  necessary guidance  for  the safe operation   of the  ship under  normal  and emergency conditions;
  13. A table  of contents  and index for each booklet;
  14. Inclining  test report  for the ship, or:
    • where the stability  data are based on a sister ship, the inclining  test report  of that sister ship along with  the light-ship  measurement  report  for the ship in question;  or
    • where light-ship particulars  are determined  by other methods  than from  inclining  of the ship or its sister, a summary  of the method  used to determine  those  particulars;

Recommendation    for determination   of ship’s stability  by means of an in-service inclining  test.

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Amit Sharma

Graduated from M.E.R.I. Mumbai (Mumbai University), After a brief sailing founded this website with the idea to bring the maritime education online which must be free and available for all at all times and to find basic solutions that are of extreme importance to a seafarer by our innovative ideas.