The training and competence requirements for ballast control operator are specified in IMO Circular A 891 (21). The circular lays down the    knowledge, experience and competence considered necessary for the proper discharge of the essential safety and pollution prevention functions assigned to the ballast control operator. The course is designed to provide the trainee with these requirements.

Course Duration: 06 Days

Course Outline

Basic stability:

    • Displacement, draught, trim, heel, freeboard, buoyancy, reserve buoyancy, etc.
    • Centre of gravity, centre of buoyancy, position of metacentre, righting lever and its effect on transverse stability;
    • Stable, unstable and neutral equilibrium;
    • Theory of moments applied to stability including the effects of heavy lifts and movement of same;
    • Effect of adding, removing and shifting weight. Calculation of vertical, transverse and longitudinal shift of centre of gravity
    • Inclining experiment report and its use;
    • Effect of free surface on stability and factors affecting same;
    • Change of trim, trimming moments, longitudinal metacentre and longitudinal stability;
    • Use of hydrostatic curves, deadweight scale and hydrostatic tables;
    • Use of cross curves to produce a curve of statical stability and information from curve;
    • Dynamical stability; synchronous rolling and angle of loll; stability criteria for MOUs;
    •  Effect of mooring system on stability;
    • Daily loading calculations;


Application of stability knowledge

  • Deck loads and effect on stability; change in lightweight;
  • Examination of ballasting systems and procedures;
  • Response to systems failures including station-keeping systems, damage to structures and subsequent action;
  • Damage control procedure, watertight compartments counter-flooding, use of pumping systems and cross-connections;
  • Environmental conditions and their effect on stability;
  • Unit and environmental limitations and criteria for changing to survival condition;
  • Zones of reduced stability, precautions to take, unsymmetrical ballasting/de-ballasting and importance of sequence with regard to stress;
  • Theory of calculations carried out on daily loading sheet, variations in chain deployed and effect on vertical moment; and.9 emergency procedures;

 Supplementary training:

On successful completion of the course, the trainee  should work in a ballast control room under the supervision of a competent person for a period of time to enable him to become fully conversant with the ballasting systems of that unit. Before being left in sole charge and being required to react alone in the event of an emergency, the individual should receive experience of simulated emergency situations.