Electric Propulsion for Pipeplay - 16 Pages

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Catalogue excerpts

ELECTRIC PROPULSION FOR PIPELAY / DIVING SUPPORT VESSELS WITH HIGH REDUNDANCY, INTEGRATED AUTOMATION AND POWER ELECTRICS FOR NOTATION DP2 and DP3 Written by: - Mr. Paul Bracké MSc. - Mr. Arie Boer Summary The paper is describing the diesel electric propulsion system for three offshore vessels, built for the Aberdeen based company Subsea 7. The first is a rigged reeled pipe lay vessel named "SEVEN OCEANS" and already in operation. The second is a flexlay pipe lay vessel named "SEVEN SEAS" being in commissioning at the moment and the third a diving support vessel the "SEVEN ATLANTIC" which still is in building process. Already in a very early stage the installations and systems needed for such complex vessels were discussed with the yard, owner, classification societies and suppliers of vital equipment and systems. These items were not related only to the applied techniques, but also to the building process, which gives higher quality and guaranteed delivery(time) of the vessel. The operational, functional, safety, DP and class requirements were the basis for the design of the power plant, propulsion system and automation on board. The complete design inclusive yard delivered auxiliary systems was reviewed in a FMEA analysis and tested in a super FAT as far as practical. The SEVEN OCEANS and SEVEN SEAS have DP2 requirements and all functions of the propulsion drives, power plant, distribution and auxiliary systems are controlled, managed and displayed via a Kongsberg automation system, which was part of the turn-key delivery. Control of the vessel is done through two wheelhouse control desks aft and fore and one controldesk in the ECR. The third vessel, the SEVEN ATLANTIC, is dedicated as a diving support vessel under DP notation 3. Difference between the electrical designs caused by the more stringent DP notations are highlighted. INTRODUCTION Where in the past (steam) diesel-direct propulsed pipelay and cable laying vessels were designed and built the demands on safety and station keeping became so high that more redundant systems were needed, these demands on safety and DP notation were not able to be mechanically solved in a proper way by diesel-direct propulsion installations. Why diesel-electric? When talking about diesel-electric propulsion, the first question to ask is: why? Depending on the type of vessel, its functionality, operating conditions and rules to be fulfilled the reasons can be: • • • • • • • • • safety, redundancy and availability noise and vibration requirements flexible installation possibilities operating profile / flexibilty / high hotel load or other consumers reduction of emissions economic demands reduction of fuel costs reduction of down time reduction of man power In case of pipe laying and diving support vessels we will especially hi-light the safety, redundancy and availability reasons. pr/acquisitie/electric propulsion pipelay vessels/version D

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pag. 2 van 16 Technically it is not required to select DE propulsion for station keeping according DP2 or DP3, however the combination of flexible installation, operating profile, safety, redundancy, maintenance and availability of the systems make the choice for an electric system technically as well as commercially attractive. The diesel-electric concepts perfect suits the safety and availability requirements applicable for pipe lay and diving support activities because of the possibilities in redundancy and separation in the power generation. One of the mayor benefits of this concept is the...

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Rules and standards General design requirement Classification notation Additional requirements FMEA Lloyd's Register of Shipping (LRoS) +100A1 PipeLaying (Diving)Ship, UD strength for load of 10 t/m2, Heli Landing Area, +LMC, UMS, CAC(3) SOLAS regulations for Cargo Ships IMCA M 04/04 S&R App D&E Facts and figures SEVEN OCEANS Yardnumber Main dimensions Deadweight Speed DP system Pipe lay equipment SEVEN SEAS SEVEN ATLANTIC breadth 28.40 mtrs. depth 12.50 mtrs. 10,930 ton 15,0 knots DP2 lay ramp with 300 ton tensioner, 80 ton A&R winch and 16 ton knuckle boom crane main pipe reel, capacity 3,500...

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pag. 4 van 16 Description of the diesel-electric installations on board of the vessels SEVEN OCEANS and SEVEN SEAS (yard numbers 709 and 710) Already in a very early stage the technical installations and systems needed for such complex vessels were discussed by the Bakker Croon Combination with yard, owner, classification societies and suppliers of vital equipment and systems. These items were not related only to the applied techniques, but also to the building process, which gives higher quality and guaranteed delivery time of the vessel. The operational, functional, safety, DP and class requirements...

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This high voltage power is supplying the main switchboards which are located in two separate rooms directly above the engineroom and connected to each other with an innerand outer bustie. From the main switchboards all consumers such as main propulsion, thrusters, crane and low voltage distribution transformers are supplied. The distribution transformers are located in the same compartment and are supplying the low voltage switchboards which are located one deck higher. The power is supplied from each main switchboard to a mix of forward and aft thrusters. In this way there is always at least...

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Additionally there is a transverse tunnel thruster in the bow with a shaft power of 2,200 kW, bringing the total installed propulsion power to a hefty 15,850 kW. The remaining power capacity is used for all electrical systems on board, including the pipe laying, ROV and crane equipment. The entire propulsion plant has been divided, fully separate propulsion/thruster rooms, resulting in a full redundancy for every link of the chain. Integrated automation, vessel management and DP system The integrated Kongsberg vessel management system for alarm, control, monitoring and DP, communicates via digital...

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fig.9 - vessel management and DP system (SEVEN OCEANS / SEVEN SEAS) The central and field station computers control all systems on functioning. Several subsystems can be controlled and monitored via mimic pages on the screen. Historical data can be collected and stored in a separate history station, allowing failure analyses and out trend analyses. Essential in diesel-electric propulsion is Power Management, enabling automatic control, management and monitoring of the power plant. Additionally there is also per thruster a fast frequency detection power reduce system installed in case of unexpected...

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