roger trinterud - konsberg maritime - tailoring dynamic positioning system for specialized vessels

kongsberg.com

06/06/2015

Kongsberg MaritimeInnovations in dynamic positioning initiated by user involvement

Presentation overview

• Kongsberg Maritime in brief• Purpose of class notations for dynamic positioning• Specialized vessel designs, generic equipment specifications• Innovations by user involvement - samples

– Windfarm service vessel– Compact drilling semisub– Jackup construction vessel

• Summary

06/06/2015 WORLD CLASS - through people, technology and dedication.

The KONGSBERG organisation


International high-tech solutions,from deep sea to outer space

06/06/2015

Advanced solutions and applications for the maritime, oil & gas, defence and space industry.

- Extreme Performance for Extreme Conditions -

WORLD CLASS - through people, technology and dedication.

06.06.2015 WORLD CLASS - through people, technology and dedication

• Offshore – Merchant Marine – Subsea – Emerging Business• 59 offices in 21 countries• 4585 employees (09/2014)

– dynamic positioning, – navigation, – automation, – subsea and seismic instrumentation – fishery and research hydro acoustics– EIT engineering services (Electrical, instrumentation and telecom)

• Equipment installed on more than 17,000 vessels

Kongsberg Maritime

Our global business system

International sales organization – life cycle support – production hubs – global value chains – global sourcing

WORLD CLASS - through people, technology and dedication.06/06/2015

Class notations



• Summary


DP class notations

• Generic, not operation or task specific• Minimum carriage requirements• Fault tolerance, redundancy, segregation• Equipment and interfaces• IMO, DNV, ABS, Lloyds etc – variation over the same theme

The missing parts

• Vessel tasks and operation• Functionality, modes• Operational procedures• Operator interactions, cooperation• Bridge and equipment layout (partly)

Vessel design



• Summary


Specialized vessels, unique challenges


Public available pictures from www:PGS latest ramform designAllseas 400m decommissioning vesselVahana Offshore jackup construction vesselFloatel International semisub accommodation unitEdda Accomodation monohullEsvagt windfarm service vessel

Specifications

• Equipment needed for specific tasks– Sensors, reference systems, operator stations

• Functionality, modes, interfaces to other systems• Location, outside view• Operator interaction


Specifications

Innovations by user involvement



• Summary


Windfarm service vesselCase

• DP 2 Standby vessel• Workshop, warehouse and accomodation for service personell• Gangway• Charter based on performance

– 5 wind turbines visited within 2.5 hours– DP required within safety zone– Weather window for operation quite large

Offshore windfarm service vessel 06.06.2015 Image from Havyard design

Windfarm service vesselChallenges

• No rules or regulations, no «best practice»• Building contract and charter signed – but can it be done?• Planning of operation depending on weather• Turbines could be anywhere within the farm• Mode changes (autopilot – manual – DP) are risk elements• Enabling and stabilizing vessel on DP is time consuming


Windfarm service vesselNew functionality for ECDIS and DP

• Planning and simulation tool• Vessel definition• Wind farm definition• Weather forcast• Work order• Route generation• Simulation and modification


• DP «always on»• All speed track/position-control• Automatic mode transitions• Operator decision points• Traffic light for gangway operator

Compact drilling semisubCase

• Observations from crew– Unit has normal movements when DP not engaged– Natural roll/pitch periods lower than on previous generation semisubs– Roll and pitch angles increases when DP is engaged– Further increasing with better position accuracy / higher gain

• Can thrusters mitigate the problem


Note: illustration only. The rig pictured is not related to the case

Compact drilling semisubChallenges

• Small waterplane area• Low meta-centric height• Physical coupling between horizontal and vertical movements• Pitch and roll excited by thrusters (unintentionally)


Compact drilling semisubNew DP filter techniques

• Wave frequency filter• Filter thruster use with wave periods• Extensive simulations done before implementation• Verified on sister rigs utilized in the same field


Jackup construction vesselCase


• Comment given to Kongsberg during an exibition:– «DP on jackups are useless»– «I do this better with the levers myself»

• Kongsberg addressed a (different) customer to learn more

Image curtesy of SeaJacks

Jackup construction vesselChallenges

• Changing wind and current impacts• Variable cargo on deck• Legs up creates shadows for GNSS• Legs up are sails• Legs down are keels• Legs are mooring the vessel


Jackup construction vesselCombining knowledge

• Location of GNSS antennas• Multi reference GNSS• Local correction signals• Sitemaps and shadow position• Input of size and weight of cargo• Interface to jacking system

– Position and load• Automatic mode changes

– AutoPos - AutoHeading – StBy• AutPos with manual bias• Quick current update


Summary



• Summary


Summary

• DP hardware might be a commodity• DP functionality and operational performance is not• Class will ensure the basics and redundancy• Vessel specification need to cover the rest• Many challenges can be solved by early addressing• Use the equipment manufacturers


From idea to concept and reality


Some DP functionalities available


Manoeuvring functions• Low speed Auto Pilot • Low speed track keeping• Seismic / survey track keeping• Wind farm track keeping• Follow target• Pipelay• Cablelay• Dredging

Position keeping functions• GreenDP• Gangway operations• Heavy lift• Offshore loading / offloading• Jackup (approach and departure)• DP in Ice

Safety functions• DP Alert• Online capability analyses• Dynamic load control• Pitch/roll reduction

kongsberg.com

06/06/2015