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On-board version (approval by all major classification societies) is also
available for all types of vessels including semi-submersible rigs |
GStab is a user-friendly graphics-oriented Windows application and a part of the SEASAFE and
PLF naval architectural packages. GStab
performs generalised loading, stability and longitudinal strength calculations
and works as a stand alone application (office or on-board) or from within the
SEASAFE/PLF shell and with SEASAFE/PLF project databases. GStab offers a reach
variety of features from specialised loading operations to advanced intact and
damage stability calculations.
The onboard version of GStab, also called SEASAFE ONBOARD, supports all types
of vessels including semi-submersible offshore platforms and drilling rigs.
SEASAFE ONBOARD can be approved by all major classification societies and has
been generally approved by Lloyd's Register of Shipping.
Below is a brief summary of the functionality provided by GStab:
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Single loading condition |
Loading
condition
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Create a loading condition by specifying:
- Draft/displacement, trim, heel and VCG/KG
- Draft mark readings and VCG (KG)
- Loads in compartments,
special input for Oil Cargo (API/Temperature),
Grain cargo, Dredging etc.
- Container loading through the special
Container Bay facility
- Deck/Unit Loads
- Cable loading through a special Cable
compartment facility
- Crane loads and crane/heavy lift operations
- Dredging loads
- Tween deck/hatch cover operations and more...
- Flooding of compartments
- Gas Pressure Control in
compartments
Most loading operations can be done
directly in the ship graphics (including compartment selection and loading,
deck/unit load definition etc)
Connect to the on-board tank level
gauging system and acquire the actual loading condition.
Load a loading condition from the
disk.
Send a loading condition as an
attachment to an e-mail to enable its recreation on a remote computer.
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Stability
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Intact, damaged and/or grounded
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Stability
Criteria evaluation
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- Assessment against any selected
stability criteria (such as IMO/SOLAS regulations),
intact as well as damaged
- All the common stability criteria are
provided by default
- New stability criteria can be defined as
macros or imported
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Strength
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- Longitudinal upright
- Intact, damaged and/or
grounded
- Assessment against permissible bending
moments, shear forces and torsion moments
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Openings/
Reference points
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Tabulated distances to
the waterline, heel to immersion etc.
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Grounding
(emergency response/ salvage features)
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Single point, two point and shelf
grounding with a tide option.
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Cargo outflow
(emergency response/ salvage features)
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Hydrostatic pressure/balance calculations to establish sea ingress and cargo
outflow for a damage with a known geometrical extent. Can be combined with
grounding.
Adjusted for ship attitude and wave.
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Interactive Graphics
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Transverse section of the ship at any
longitudinal position. Selection of
compartments.
Loading operations directly in the ship graphics (including deck/unit load
definition directly in the ship graphics)
Displaying ship attitude, cargoes, reference points, damages, points
of grounding etc.
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Several loading conditions |
Condition tree
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Reflecting the order in which conditions are
created; useful for storing and analysing loading sequences.
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Summary
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Displaying details of several
loading conditions in one
table for comparison
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Stability curves
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Plotting
GZ Stability curves for several conditions in
one diagram for comparison
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Advanced Stability Calculations
(Intact & Damage)Applicable to:
* Current condition
*
Set of existing conditions
* Range of
conditions by draft/ displacement & trim |
Intact Stability
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- Production of GM/KG Limiting Curves of
Stability
- Production of Allowable Grain Heeling Moments
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Deterministic Damage Stability
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- Production of GM/KG Limiting Curves of
Stability
- Automatic generation of damage cases
according to the regulations
- Manual definition of damage cases graphically
- Water on deck calculations (Stockholm's
agreement etc)
- Any number of intermediate stages of
flooding
- Single or several free
surfaces in the intermediate stages of flooding
- Cross flooding
(any number of intermediate stages)
- Lesser extent damage cases
- Grouping damage cases into damage case
sets
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Probabilistic Damage Stability |
- Cargo ships
and
Passenger ships
- Definition of subdivisions with full
graphical support
- Unlimited number of damage zones, unlimited
number of longitudinal and vertical bulkheads
- Automatic generation of damage cases
according to the defined subdivisions including automatic generation of lesser
extent cases etc
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Powerful tools for presenting and analysing
the results
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Sortable tables:
- Min GM, GM for selected criteria,
Criteria Evaluation, GZ etc.
Interactive diagrams:
- GZ Curves
- GM/KG Limiting Curves
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GStab can run on the following operating systems:
Microsoft Windows Server 2003
Microsoft Windows XP Home / XP Professional [recommended]
Microsoft Windows 2000 / 2000 Pro / 2000 Server/ Me
Microsoft Windows 95 / 98 operating system or
Microsoft Windows NT Workstation operating system version 4.0 or later
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Computer/Processor:
PC with a Pentium Pentium II or higher
[Pentium III class 600MHz or higher recommended]
NOTE: the onboard version can be configured to work
on a PC with a Pentium 166 MHz processor or higher
- Minimum RAM requirements:
160 MB for Microsoft Windows Server 2003
128 MB [160 MB recommended] for Windows XP Home / XP Professional;
160 MB for Windows 2000 Server
80 MB [96 MB recommended] for Windows 2000 / 2000 Professional;
32 MB [40 MB recommended] for Windows 95 and Windows 98;
40 MB [64 MB recommended] for Windows NT Workstation
- Display:
Super VGA (800 × 600) or higher-resolution 15'' monitor with 256 colours
[SXGA (1280 × 1024) 17'' monitor or higher with 32-bit colours recommended]
- Drive:
CD-ROM or DVD-ROM drive
- Hard-disk space required:
Minimum installation: 40 MB (on-line help included)
Maximum installation: 3-15 MB per ship + full Seasafe documentation 40-50
MB
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