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| About
SEASAFE-GStab and SEASAFE-Onboard |
| Onboard
version (approval by all major classification societies) is also available
for all types of vessels including semi-submersible rigs |
SEASAFE-GStab is a user-friendly graphics-oriented Windows application and a part of the SEASAFE and
PLF naval architectural packages. "GStab" stands
for "General Stability and Strength module" which
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 SEASAFE-GStab:
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General |
Interactive Graphics
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Interactive 2D/3D model of the vessel displays
ship attitude, cargoes, reference points,
damages, points of grounding. draft marks etc and allowing single or
multiple selection of compartments, deck/crane unit loads etc in one of the
following graphical views of the vessel:
- 2D Transverse section of the ship
(hull and compartments) at any
longitudinal position.
- 2D Side Profile/Silhouette
- 2D Plan Profile/Silhouette
- 3D Rendered Model (transparency and
many other rendering and presentational options can be selected by the user)
Loading operations can be performed directly in the graphics (including deck/unit load
definition and heavy-lift operations directly in the graphics).
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Report Function
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Highly customizable template-based report for all
the features and calculations. The software is pre-loaded with a library of
standard report templates.
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User Profiles
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The layout, contents and format of tables,
diagrams and reports can be fully customized by the user. All such customization
can be saved in User Profiles. One User Profile contains customization of all
the screens in the software, any number of such User Profiles can be defined,
all the screens are re-arranged according to a certain User Profile with one
mouse click. The softwae is pre-loaded with Standard User Profiles.
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Intergrated Import/Export and Backup/Archive/Restore
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There is an integrated Import and Export, Backup
and Restore solution for all user-defined data such as loading condition,
standard loads libraries, report templates and user profiles etc.
Any particular subset of data can be selected for Import, Export, Backup or
Restore (for example one or several loading conditions selected by the user).
Any subset of data including loading conditions can be exported to a file on a
USB Memory Stick or CD-ROM or as attachment to an Email and then re-imported on
another computer that has the same SEASAFE-GStab software installed. This
enables exchange of user data and loading conditions between the office ashore
and onboard the vessel or between different computers in the same or different
offices.
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Optional Connection to a Tank Gauging System for SEASAFE-Onboard
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SEASAFE-Onboard version of the software can be configured
to communicate with the vessels Tank Gauging System in order to obtain the
levels of the loads in the tanks and the actual floating postition through draft
sensors and inclinometres, other parameters can also be exchanged such
wind/current speeds, thruster and mooring forces etc.
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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
(support for A-frames and complex cranes, for instance
knuckle jib cranes, can be defined and operated, there is support for tandem
lift, deep-water operation, operation with different hooks and wire arrangements
for one crane etc)
- Dredging loads
(with automatic inflow and outflow over the hopper edge and
the rotation coefficient for the dredging cargo)
- Tween deck/hatch cover operations and more...br>
- 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 provided by Seasafe support and imported
- All the intermediate results for the Stability
Criteria Evaluation such as GZ & Heeling Arms Curves and their Areas Under
curves, all the angles related to the stability criteria (such as angles of
downflooding etc), the break-down of wind moment calculations for the IMO
Weather Criteria and much more
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Strength
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- Longitudinal upright (upright or inclined for
Torsion Moments)
- Intact, Damaged and/or Grounded
- Assessment against Permissible Bending Moments
& Shear Forces
- Assessment against Permissible 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 (hull and compartments) at any
longitudinal position. Multi-selection of
compartments in the Graphics.
Loading operations directly in the graphics (including deck/unit load
definition directly in the graphics)
Displaying ship attitude, cargoes, reference points, damages, points
of grounding. draft marks etc.
Interactive 3D model of the vessel allowing selection of compartments, deck/crane unit
loads etc
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Several loading conditions |
Condition tree
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Reflecting the order in which
loading 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/Cross-curves of stability
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Tables and Diagrams
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Freeboard & Down-flooding Angle |
Tables and Diagrams |
Advanced Stability Calculations
(Intact & Damage)
Applicable to:
* Active Loading Condition
*
Set of Existing User-defined Loading 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 damaged compartments 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, FPSOs, bulk-carriers etc. This optional module enables any
user-defined
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.
- This functionality, if enabled, makes SEASAFE-Onboard
(GStab) a Type 3 Loading Instrument.
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Probabilistic Damage Stability |
- Harmonized Probabilistic Regulations
for both Cargo and Passenger ships whose keel was laid after 1 January 2009, aslo
covering Special Purpose Ships Code
- Cargo ships Probabilistic
Regulations (Dry
Cargo) before 1 January 2009
- Passenger ships
Probabilistic 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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Intact & Damage Stability Calculations Results tables
are interactive and offer filtering and sorting of large sets of output data to
help gain detailed insight into the reasons behind the output results and to
find all the intermediate values used for calculation:
- Min GM [or Max KG] table - quickly
find the most critical ranges of drafts/trims and their most critical damage
cases, stability criteria etc, sort by GM Excess to instantly create an overview
of the most severe cases in decreasing order (most severe cases being listed
first),
- GMreq for Selected Criteria [or KGreq
for Selected Criteria] table - quickly sort and filter the results to gain
insights into which parts of the applicable stability regulations are the most
critical ones for any subset of evaluated drafts/trims,
- Criteria Evaluation table - quickly sort
and filter the results to gain insights into which parts of the applicable
stability regulations are the most critical ones for any subset of evaluated
drafts/trims,
- GZ Curves table - Tables of GZ Curves and
Heeling Arms and the areas under these curves, to complete all the intermediate
results for the evaluated cases
Interactive diagrams:
- GZ Curves diagram
- GM/KG Limiting Curves diagram - gain
insights into vessels stability properties [such as critical openings, stability
criteria, damage cases etc for the selected range of drafts/trims] by clicking
in the diagram. View the Overall limiting curve, or its components with respect
to Trims, Damage Cases, Stability Criteria, Direction of the Evaluated
Inclination Axis (the software is capable of evaluated stability when heeling
about any axis, not necesserily longitudinal or transverse) etc
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Back to the top
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SEASAFE-GStab can run on the following operating systems:
Microsoft Windows 7 (all 32-bit editions, all 64-bit editions) [recommended]
Microsoft Windows Vista (all 32-bit/64-bit editions)
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:
Intel Core or Pentium Dual-Core is recommended if
Microsoft Windows Vista or Windows 7
Pentium IV or higher if Microsoft Windows XP
NOTE: although not recommended, if critical, the
SEASAFE-Onboard version
can be configured to also work
on an older PC with an older version of MS Windows
and an older Intel processor such as Pentium 166 MHz, Pentium II, Pentium III
class 600MHz etc
- Minimum RAM requirements:
at least 3 GB for Microsoft Windows 7
1 GB for Microsoft Windows Vista (2GB to enable Vista Aero interface)
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/Monitor:
1600x1200 resolution and at least 20” monitor [recommended]
[SXGA (1280 × 1024) 17'' monitor or higher with 32-bit colours]
NOTE: although some user-friendliness might be lost, our software can be made
fully functional on a computer with a smaller/older monitor such as
Super VGA (800 × 600) or
a higher-resolution 15'' monitor with 256 colours
- Drive:
If the software is downloaded as a single self-installing executable [download
size ~35 MB]:
USB stick or direct Internet Connection [recommended]
If the software is purchased on a CD-ROM:
CD-ROM/DVD-ROM drive or similar device capable of reading CD-ROM
- 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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