 |
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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/drilling rigs and
jack-ups.
SEASAFE-Onboard can be approved by all major classification societies and has
been generally approved by Lloyd's Register.
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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Hydrostatics |
Hull/Compartment Hydrostatics
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Tables and Diagrams |
Capacity Table
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Including Max Free Surface Moment calculations
etc
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KN Curves
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Tables and Diagrams
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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
|
- 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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|
Direct Damage Stability for SEASAFE-Onboard |
- SEASAFE-Onboard/GStab can now, as an
option, integrate the Direct Damage Stability calculations module for all
types of vessel including oil tankers. This optional module enables a
non-standard loading condition to be checked onboard with respect to both
intact and damage stability requirements, where the damage stability is
checked for that non-standard loading condition for all the damage cases in
a predefined set of damage cases.
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Probabilistic Damage Stability |
- Harmonized Probabilistic Regulations
for both Cargo and Passenger ships whose keel was laid after 1 January 2009
- Cargo ships regulations (Dry
Cargo) before 1 January 2009
- Passenger ships regulations before
1 January 2009
- 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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Back to the top
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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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