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ADVISORY COMPUTER SYSTEMS SOFTWARE
STATION KEEPING RISER MANAGEMENT
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Global Maritime Technical Services are the
analytical and software design and development
division of Global Maritime Holdings and are
based in the London Headquarters. Global
Maritime has operating companies in Aberdeen,
London, Houston and Stavanger. GMTS specialise
in writing and using software to help design and
operate marine drilling rigs. Core corporate
specialities include practical and analytical
aspects of mooring, D P stationkeeping, risers,
hydrostatic stability, structures and
mathematical/statistical simulation. This
presentation has been prepared to show the main
features of Gmoor32 a key program at the core of
both our design and advisory systems and used
throughout the group as the main mooring tool
Gmoor32
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The main program in the Gmoor32 suite is
Gmoor32Q. The Q denotes that it uses the
standard quasi-static approach to mooring
modelling. The program (as GMOOR for DOS) was
approved by the Norwegian Maritime Directorate in
1985 for such analysis (water depths up to 450m -
1500 ft). Gmoor32D adds line dynamic analysis
to Gmoor32 and can perform analysis to the
dynamic requirements of API RP2SK and DnV
POSMOOR. The main difference with Gmoor32D is
that the line tensions are calculated from a
lumped mass model which accounts for the mass and
drag on the line and the ensuing potential
vibration modes. Gmoor32D will be released in
February 1998 and has the same interface and
appearance as Gmoor32Q. All the latest Global
Maritime software runs under 32bit Windows (NT,
95 and 98) and interfaces are designed to adhere
to those standards with which most users are
already familiar. Similarly the products have
extensive Help available with the user manual
available on-line.
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Gmoor32 is straightforward to use and, provided
users are familiar with mooring systems and
Windows, they should be achieving useful results
very quickly. Existing GMOOR users will find the
transition easy and will notice a number of
powerful new features
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This side shows text summaries of results and
user options
This is the main Gmoor32 Display
This section is normally the plan view and
includes field details if a field plan was
prepared
Riser performance details (needs RISERDYN)
Input Weather conditions
You can also choose the units displayed and the
colour scheme you prefer
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This is an example with a field plan showing two
pipelines
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This shows different user selected colour scheme
for vessel and background - you can also specify
the colour of intact and broken lines
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You may specify case details for identifying
output and time labels for plotting (future
feature)
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You can input wind, waves and current if a custom
vessel file (CVF) is available - forces and
motions are then calculated automatically
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You can adjust the payout or break/repair any
mooring line
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This can also be done by clicking on a mooring
line.
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Anchors can be repositioned by dragging and
dropping
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Integrated Riser Analysis An optional feature of
the program is Integrated Riser Analysis and
Station Keeping Guidance. A model of the riser
is incorporated in the mooring analysis and
Gmoor32 calculates the flexjoint angles and slip
joint stroke. If limits are set for the slip
joint stroke and flex joint angles then Gmoor32
will provide guidance on the optimum position of
the rig.
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Limits are set for the slip joint stroke and flex
joint angles. The present position of the rig is
used to calculate the actual values for both
intact and line failed conditions. The optimum
location for the rig is then recommended.
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The guidance results can be shown graphically.
The green zones show where the rig should be
positioned to satisfy the input limits. In this
example the rig should be 200ft north of the
wellhead to satisfy all three limits.
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You can control the thrusters manually both
individually and in joystick mode. A future DP
version will also model the control system
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You can specify the allowable line tension safety
factors for code-checking
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You can get GMOOR to calculate the line payout
changes to retain the present tension
distribution and move the vessel to a new target
position
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The method of analysis can be chosen -
consequence does all analyses for all single
failures and prepares a summary table.
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On a modern PC the solution scheme is fast and
the vessel is displayed in the new offset
position.
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HEAD-UP display shows mooring, environment and
thruster forces
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Catenary profiles are available
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So are tension-excursion characteristics for each
line
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And the moorings restoring force curves
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• Gmoor32Q handles all the different line
  configurations GMOOR does including
• Multi-component lines in wire, chain or synthetic
• Surface or submerged buoys
• Sinkers (clump weights) between components
• Gmoor32Q also adds BATCH analysis which can
  automate the production of location moorings
  assessment for insurance or certifying authority
  approval. It can also be used to predict the
  sequence of events/vessel performance in future
  weather sequences (forecasts).

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Batch runs are performed for sets of weather
data. Each batch run will perform an intact
analysis and perform both static and transient
single line failure analyses for all legs
deployed.
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A batch analysis for a typical eight leg spread
will generate 136 runs if eight weather
directions are analysed. A powerful reporting
database is used to filter and summarise batch
output.
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That concludes this brief presentation of Gmoor32
capabilities For further details please contact
Barry Miller, Nigel Thomas or Neil
Walker GLOBAL MARITIME TECHNICAL SERVICES 12
Craven Street, London, WC2N 5PB Telephone 0171
930 6545 Fax [phone] email
gmoor32_at_globalmaritime.com