Platform Stability Management Program

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© Copyright QinetiQ Pty Ltd 2013

PLATFORM STABILITY MANAGEMENT PROGRAM

Violeta Gabrovska

June 2015

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Contents

1. Introduction

2. Stability program governance and management Stability compliance Weight management and various interfaces Docking and slipping

3. Conclusion


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1. IntroductionStability - critical safety characteristic failure of which may result in:

loss of life, early cancellation of a mission and total loss of a vessel

Maintain low risk of failure - compliance with designated set of rules

Influencing factors - lightship growth and weight distribution

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1. Introduction

Stability Program is designed to manage the compliance and validation process and the interaction between three major components:

Stability

Weight management

Safety during docking


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1. Introduction

Stability Management Program :identifies requirements and their applicationprovides structure and management toolsassures vessels will have sufficient stability and structural strength to operate in the defined service category, environment and during maintenance periods demonstrate compliance with the DEF (AUS) 5000 regulations or other designated rules as a minimum assurance for safe operation


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2. Stability program governance and management

Program management plan – governing documentManagement structure – dynamic, allows flexibility in priorities and can be amended as the needs change

Work instructions – describe the process

Custom tailored supporting tools: compliance matrix; activity schedule; activity templates and check lists; calculation spread sheets; and vessel specific continuous compliance monitoring tools


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2. Stability program governance and managementGoverning structure


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2.1 Stability Stability compliance - KG (VCG) curve Limiting KG curve is developed for each RAN class of ships - trialling the highest KG for various intact and damage criteria while still complying with all stability requirements

Once approved by the NA, the Limiting KG Curve becomes the stability standard Example – refer to the chart


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2.1 Stability Compliance margins With aging, platform’s KG (VCG) and displacement margins will be reduced due to capability upgrade, change in operational requirements or various reasons and in some cases those margins can be depleted, which may require limitations on operation to maintain compliance, for example:

To reduce VCG – using ballast, increasing min BFR; To reduce displacement - limiting fuel, fresh water, other effects; Limiting operational environment

Those limitations if not resolved, may limit the vessel ability to complete the desired mission.


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2.1 Stability NA controls the compliance margins by assigning a stability status for each class, which also influences the period at which the stability compliance is verified and T&S Handbook updated

Stat D e fi n i t i o n1 An increase in displacement and rise in KG are acceptable without compensation provided each

change is within the limits, and changes are notified to the Support Authority

2 Neither an increase in displacement nor a rise in KG can be accepted without prior approval of the Naval Authority. Weight and moment compensation are required for all changes.

3 An increase in displacement is acceptable within the limits specified below, but a rise in KG must be avoided. Moment compensation only is required. Ships with this status are permitted alterations up to the limits specified below provided net weight increases occur below the lightship KG given in the most recent T&S Handbook or net weight reductions occur above the same KG. Changes shall be notified to Support Authority

4 A rise in KG is acceptable within the limits specified below, but an increase in displacement cannot be accepted without prior approval of the Naval Authority. Weight compensation is required for all changes


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2.1 Stability

Management of compliance marginsManagement of the stability configuration and changes to the physical state of the vessels are responsibility of each SPO:

Stability schedule

Weight control

Monitoring of stability compliance

Interim checks

Stability in harbour environment


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2.1 Stability


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2.2 Weight management

Necessity

All RAN ships have to maintain:

limiting displacement (maximum weight a ship can displace without adversely affecting ship stability, structure or design speed) and

vertical centre of gravity

to ensure adequate reserves of stability and hull girder strength

Weight management is implemented to ensure the ship remains below those limits throughout its life


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Contributing factors to weight change

Configuration change: Operational:Modifications - Design enhancement Upgrade New capability

Obsolescence

Maintenance (accumulation of spare parts)Personal effectsRecreational sportChange in loading conditions


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2.2 Weight managementManaging weight and moments: effort is required from both sides - SPO and operator


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2.2 Weight managementWeight Register –

Available for assessment of configuration change proposal and is updated after implementation Provides continuous monitoring between compliance validations

Ship check – Lightship – Naval & Ship StoresProvisions and stores – food, spare parts & tools etc.Crew and effects – incl. recreational sport itemsMiscellaneous - rigging, specialised equipment, gym etc.Change in loading conditions – trainees, containers etc.

The program offers a link between regulator and operator by providing up to date information about any changes in stability configuration


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2.2 Weight managementWeight Register

Developed for each vessel – example –

3 vessels in a class, stability status 2,3 or 4, stability check every 2 years – each vessel stability is checked once in 6 years

1-st tab – Instructions and Definitions,

2-nd tab – Limitations, compliance with the KG curve

3-rd – Weight Register, entry of weight changes

Lightship measurements - updated after stability check

Loading conditions updated when necessary


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2.2 Weight managementWeight Register

Limitations –

continuous monitoring of the compliance with the KG (VCG) curve


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2.2 Weight managementWeight RegisterRecording all weight changes to lightship


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Example

KG (VCG): 3mm margin on VCG

How easy is to exceed this margin? (2000t displacement vessel)

-1.2t from ER

+0.3t on bridge


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Displacement:Margin - 3.130t (0.16% of the limiting )

How easy is to monitor this margin?

Tonnes per Centimetre immersion (TPC) ~6.00t

Margin – less than 5mm draft to limiting draft

For practical reason margin on displacement should not be less than the TPC


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Additional application of weight management:

Supporting Life of Type Extension (LOTE) programs

Supporting management of the interface between launching/lifting equipment capacity and lifting loading condition of small vessels


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2.3 Docking and slippingImportant aspects for safe and successful docking:

Safety of the vessel during slipping/docking

Adequacy of the facility and qualification

Protection of the vessel during lay period

Adequacy of procedures

Personnel qualifications


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2.3 Docking and slipping

The program can assist with:

Dockyard qualification assessment

Docking calculations and plan - Library of selected dockyards spread-sheets

Weight management – WR used for configuration change implementation during maintenance periods, refer to

Risk management during the docking period – utilaising WR & docking spread-sheets for compliance monitoring

Contingency plan


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2.3 Docking and slipping


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3. Conclusion

Stability Management Program:Flexible, customer oriented

Manage stability compliance

Supports maintenance process

Supports configuration change management

Supports Life of Type Extension programs

Manage interface between small boats and launching/ lifting appliances

www.QinetiQ.com.au


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Engineering

Platform Stability Management Program