NZQA registered unit standard
28910 version 1
Page 1 of 3
Title
Explain the principles of vessel displacement, stowage, stability, and
loading stress
Level
5
Credits
10
Purpose
People credited with this unit standard are able to explain
vessel displacement, stability, and trim concepts; apply stability
theory to vessel loading scenarios; and explain loading stress
considerations.
Classification
Stevedoring and Ports Industry > Cargo Operations
Available grade
Achieved
Explanatory notes
1
Legislation relevant to this unit standard includes
Maritime Transport Act 1994;
Maritime Rules are as prescribed by Maritime New Zealand and listed in the rules
section at: http://www.maritimenz.govt.nz.
2
Any new, amended or replacement Acts, regulations, standards, codes of practice,
guidelines, or authority requirements or conditions affecting this unit standard will
take precedence for assessment purposes, pending review of this unit standard.
Outcomes and evidence requirements
Outcome 1
Explain vessel displacement principles.
Evidence requirements
1.1
Explanation includes the principles of vessel flotation in achieving floatation
equilibrium.
Range
1.2
includes – Archimedes principle, displacement, volume, draft,
buoyancy, floatation, density of water, mass and weight of vessel.
Explanation includes the principles of displacement and buoyancy for different
stowage loading weight situations.
Range
three different stowage loading weight situations;
explanation includes – tonnage, draft, load line zones, specific
gravity of water (tropical fresh), immersion.
MITO New Zealand Incorporated
SSB Code 9013
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28910 version 1
Page 2 of 3
Outcome 2
Explain vessel stability and trim concepts.
Evidence requirements
2.1
Stability and trim is explained in terms of centres of gravity and buoyancy.
2.2
Stability is explained in terms of righting lever, initial/small angle and large
angle/ultimate stability and the GZ Curve.
2.3
The explanation includes how the metacentric height is used to indicate vessel
stability.
2.4
The free surface effect is explained in terms of centre of gravity and centre of
buoyancy.
2.5
The concept of reserve buoyancy is explained.
2.6
Trim is explained in terms of moments to trim and the effects of cargo weight
and placement on trim.
Outcome 3
Apply stability theory to vessel loading scenarios.
Evidence requirements
3.1
Stability principles are applied to different cargo weight scenarios.
Range
scenarios include – light ship, fully laden ship, vertical centre of
gravity variations, draft marks.
3.2
The implications of varying cargo densities are determined for a vessel loading
scenario.
3.3
The implications of the free surface effect are determined for liquid cargoes.
Outcome 4
Explain loading stress considerations.
Evidence requirements
4.1
Deck-weight load considerations for cargoes are explained in relation to vessel
strength.
4.2
Container pile weight considerations are explained in relation to vessel strength.
MITO New Zealand Incorporated
SSB Code 9013
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
Planned review date
28910 version 1
Page 3 of 3
31 December 2020
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
17 September 2015
N/A
Consent and Moderation Requirements (CMR) reference
0145
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMRs). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Comments on this unit standard
Please contact the NZ Motor Industry Training Organisation (Incorporated) (MITO)
info@mito.org.nz if you wish to suggest changes to the content of this unit standard.
MITO New Zealand Incorporated
SSB Code 9013
 New Zealand Qualifications Authority 2016