Google Links

Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Calculate stability
   • Vessel stability data book is made available and checked for endorsement
   • Data is interpreted to determine safety parameters for vessel
   • Stability is accurately calculated using data extracted from vessel stability data book
   • Stability calculations are checked to ensure they correlate with data set out in vessel stability book
   • Miscalculations or unsafe conditions are recognised and recalculated or checked
   • Calculated stability data is recorded using appropriate units and correct number of significant figures
2. Control vessel stress and stability
   • Information from vessel stability information is used to determine loading limits and displacement from draft
   • Vessel weight distribution is managed to maintain stability condition within safe limits at all times and regulatory requirements are complied with under all conditions of loading
   • Relevant stability information is correctly communicated to others as required
   • Stability conditions of vessel are managed in adverse weather conditions
   • Emergencies that may jeopardise vessel stability are recognised and appropriate action is taken
3. Maintain records of stability management
   • Data and information related to stability management is accurately recorded
   • Data and information related to stability management is filed and stored according to organisational procedures

Range Statement

Specifies different work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Range is restricted to essential operating conditions and any other variables essential to the work environment.
Stability calculations must include:	correlation against stability book data draft final height of the centre of gravity above the keel of a vessel (KG) trim
Loading limits include one or more of the following:	not exceeding allowable passenger carrying capacity and distribution not exceeding vessel designed cargo carrying capacity understanding the effect of fuel, fresh water and ballast on cargo capacity
Emergencies include one or more of the following:	cargo shift damaged hull flooding of cargo spaces

---

Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least one occasion and include:

attending to appropriate level of detail in recordkeeping

carrying out basic calculations associated with maintaining vessel stability

managing loading and weight distribution of vessel to ensure assigned load line conditions are not exceeded

managing stability of vessel in a range of conditions

producing reliable documentation

recognising problems affecting vessel stability.

---

Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of:

bilging and permeability

centroids and centre of gravity

change of draught and trim (MCT)

conditions of stable, neutral and unstable equilibrium and effects of disturbing vessel from upright

construction features and stress characteristics for vessels

density and specific gravity

dockwater and freshwater allowance

effects of free surface of liquids

factors that affect the rolling period of vessel

forces and moments

information contained in stability data books

loading and discharging weights

principal stresses that act on the structure of a vessel

principles of vessel stability

procedures for carrying out basic calculations associated with vessel stability

relationship between light displacement, loaded displacement and deadweight tonnage

stability curves

steps involved in bringing an unstable vessel to a stable condition

tonnes per centimetre immersion (TPC)

transverse and longitudinal dynamics

work health and safety (WHS)/occupational health and safety (OHS) requirements and work practices.

---