WIND TURBINE SHUTTLE HUISMAN PRODUCT BROCHURE

Transcription

1 WIND TURBINE SHUTTLE HUISMAN PRODUCT BROCHURE

2 WIND TURBINE HUTTLE TABLE OF CONTENTS 01 DESCRIPTION Vessel General Purpose of the Vessel High Workability 0 1. Installation Scenarios High Transit Speed and Excellent Seakeeping Running on LNG Fuel DP3 System Vessel Motion Compensation System Motion Compensation in the Hoisting System Ballast System Structural Design Maintenance, Repair & Decommisioning Additional Applications of the Vessel Shallow Draft Catamaran Version 10 0 TECHNICAL SPECIFICATIONS 11.1 Vessel 11. Top Side Equipment 11 Artist s impression of WTS

3 1. DESCRIPTION WIND TURBINE SHUTTLE ADVANTAGES 1.1 Vessel general To improve the efficiency of offshore wind turbine installation, Huisman developed the Wind Turbine Shuttle: a dynamically positioned, fast sailing (1 knots) SWATH - Small Water plane Area Twin Hull - type construction vessel which can carry and install two fully assembled wind turbines. By combining low vessel motions, compensating systems and an accurate dynamic positioning system, the wind turbine is kept virtually stationary in relation to the fixed foundation during installation. At least 80% workability in annual North Sea conditions Excellent vessel motion characteristics Active roll and pitch vessel motion compensation systems Active heave, pitch and surge compensation hoisting systems High transit speed and DP3 Can transport up to two wind turbines in one piece Commissioning and testing onshore, turbine earlier online Also capable of installing jackets, mono piles, piling, and other offshore structures 3

4 WIND TURBINE HUTTLE 1. Purpose of the vessel The vessel is especially dedicated to installing wind turbines offshore. Fully assembled wind turbines delivered to the installation site minimizing the time of construction works offshore. The vessel can also carry two large jackets or two large mono piles or combinations thereof. In case of jacket installation the wind turbines shuttle can carry the piles needed to secure the jacket to the seafloor. The WTS is a SWATH-type vessel which provides excellent vessel motions and therefore a large workability. Since the unit is not jacked out of the water, the workability is not limited by this operation. Also no additional time is consumed by this operation. The unit has two large underwater pontoons, rather small columns and a deck box above the water. As soon as the unit sails out of the harbour, the draft is adjusted so that the pontoons are submerged beneath the water line, providing low vessel motions during the transit and during the installation. The vessel is able to transport simultaneously two complete wind turbines with a maximum mass of 1000mt each. This enables the vessel to install all current models of wind turbines and future models up to an approximate size of 8MW. As the wind turbines can be fully erected, commissioned and tested onshore, the offshore commissioning time is minimized. The wind turbines will be earlier on-line and deliver power faster to the grid. The vessel can also carry and install two complete foundations (jacket type and mono piles) with the maximum weight of 000mt each. The main capabilities of the new vessel are: Installing complete wind turbines Installing complete foundations (jacket type) Installing complete foundations (mono piles) Pile driving All year operation in The North Sea High yearly performance with very limited down time. WTS with two wind turbines WTS with two jackets 1.3 High workability Traditionally, crane vessels and jack-up platforms are utilized for offshore construction works. Normally parts of the wind turbines are loaded into the vessel and then transported to the wind farm site. The wind turbines are assembled from these parts offshore utilizing a large crane. However the workability of crane vessels without jack-up system is very low. Even a moderate sea state makes the lifting operation impossible. Operating the vessels or platforms equipped with the jack-up system is time consuming. The lowering and retrieving of the legs of the jack-up system takes time. These operations are also sensitive to environmental conditions. Normally the transit speed of these vessels is quite low. WTS with two mono piles WTS with piles

5 The vessel is able to install wind turbines with a maximum significant wave height of 3.5m. This gives the unit a workability of at least 80% of the year in North Sea conditions in the open areas and up to 95% closer to the shore. By choosing the heading, the vessel will mainly endure (limited) heave, pitch and surge motions. Additionally the vessel is equipped with an active pitch and roll damping system to further reduce vessel motions. 1. Installation scenarios Minimization of offshore work is achieved by transporting the wind turbines as entirely tested units. All the testing and commissioning is done onshore. This requires a low number of dedicated shore bases (e.g. Denmark, East of England, and Scotland). The vessel has an optimised hull form and significant installed power to reach a high transit speed. In 1 hours the vessel can travel approx. 150 miles. WTS picking up wind turbine from a shore base North Sea with wind parks and 150 miles radius from 3 shore bases (East of England, Esbjerg (DK), Scotland) Distance shore base to wind farm [miles] Load two wind turbines Sail to wind farm Install two wind turbines Sail back to harbour Contingency Total for two wind turbines Load two foundations Sail to wind farm Install two foundations Sail back to harbour Contingency Total for two foundations Total for two wind turbines & foundations Number of wind turbines & foundations per year based on; workability of 80% for installation of wind turbines and a workability of 90% for installation of foundations, excl. piling [-] 5

6 WIND TURBINE HUTTLE 1.5 High transit speed and excellent seakeeping Since the WTS can take only two wind turbines or two foundations the requirement for covering the distance between the shore base and the installation site in a short time is of major importance. At the same time good seakeeping performance is required for installation. A SWATH type vessel is chosen due to combination of excellent seakeeping characteristics and the high transit speed. Extensive research and model testing resulted in a highly optimized hull shape. 1.6 Running on LNG fuel The vessel will be equipped with diesel generator sets capable of running on both MDO and LNG. If LNG bunker facilities are provided all operations of the Wind Turbine Shuttle can be performed using LNG fuel making the whole installation campaign even more environmentally friendly. Resistance model tests in towing tank CFD calculations Seakeeping model tests in waves 6

7 1.7 DP3 system The high redundancy of the DP3 system is provided by arranging all four diesel generators in separated engine rooms. The vessel is equipped with two large variable pitch propellers to obtain a transit speed of 1 knots. Together with the large variable pitch propellers, eight tunnel thrusters are used for dynamic positioning during installation operations. The dynamic positioning system keeps the vessel in place during installation of the wind turbines, even in the most severe weather conditions. By using dynamic positioning (instead of mooring or jacking out of the water) the installation is very fast. Separated engine rooms 1.8 Vessel motion compensation system Although the SWATH type vessel provides excellent seakeeping performance even more effort was put into further improvement of motions in waves. Active roll and pitch compensation systems were developed. The system utilizes a moving mass. For roll compensation a mass driven in the transverse direction is applied. For pitch two masses are used, which move in the longitudinal direction. The vessel motions are reduced by 30-0% when the system is in active mode. These systems will be mostly used during the wind turbine installation sequence when the vessel motions have to be minimized as much as possible. Set-up for testing active pitch compensation system 7

8 WIND TURBINE HUTTLE 1.9 Motion compensation in the hoisting system Huisman has used its 5 years of experience in the application of active heave compensation systems on cranes and other lifting devices for the design of the Wind Turbine Shuttle. The wind turbine is held in place by a hoist frame. This frame consists of two tables connected by a steel structure. Each table is equipped with an active controlled, horizontal movable, XY-clamp. The wind turbine hoist frame connected to the hoist tackle at the bottom table. A passive heave compensation system in the combination with active wire connection between the wind turbine and the foundation is applied for soft controlled lowering and landing of the wind turbine on the foundation. Once the wind turbine is lowered a quick connector is engaged firmly connecting the wind turbine with the foundation. From this point the Wind Turbine Shuttle can sail to the next installation site. The bolt connections can be safely made while the wind turbine is still secured by the quick connector. The quick connector will be picked up later. Upper clamp Lower clamp 8

9 1.10 Ballast system A conventional water ballast system is utilized for changing the draft from shallow harbour draft to the submerged transit / installation draft. During installation, the load of the wind turbine is transferred from the WTS to the foundation. A constant draft has to be maintained. Here a dedicated water ballast system is applied allowing fast water ballast exchange minimizing the wind turbine installation time. The longitudinal position of the dedicated water ballast tanks is close to the longitudinal centre of gravity of the wind turbines. This allows pumping the amount of water equal to the weight of the wind turbine without necessity to compensate for trim change since the trim remains constant. The design wave approach is applied for the global structural analysis of the vessel. The strength against the yield stress and buckling is checked. Fatigue is considered from the very beginning of this project. ANSYS is applied for the structural finite element analysis (FEA). The wave conditions of The North Sea set very high requirements for the design with respect to the fatigue. The major structural connections of the WTS are carefully checked for fatigue and the geometry of these connections is optimized Pump room 1.11 Structural design The installation of the wind turbines and jacket foundations requires large recesses in the deck box structure. The requirement for high speed and rudder arrangement make the struts long and very narrow, thereby attracting significant wave forces. The structural design of the vessel is carefully performed covering both the global strength and the fatigue requirements. 9

10 WIND TURBINE HUTTLE 1.1 Maintenance, repair, & decommissioning Due to its capacity to transport two wind turbines at the same time, the vessel is perfectly suited for exchanging wind turbines. The vessel can install one or two new or refurbished wind turbines and pick up two old wind turbines. All repair, maintenance and decommissioning work is performed onshore. Because the wind turbine shuttle can transport complete turbines, it is an excellent tool for power upgrades and overhaul of existing wind turbines Additional Applications of the Vessel The vessel also provides an excellent platform for offshore construction works. The Wind Turbine Shuttle can be deployed for installation and removal of the top sides and foundations of existing oil platforms. The fact that the vessel is equipped with the highest level DP3 system means that the vessel can be also utilized in the oil industry. Structure of WTS 1.1 Shallow Draft Catamaran Version A shallow draft catamaran version of the Wind Turbine Shuttle can be used in the areas with shallow water depths (see figure). The installations will be carried out in mild weather conditions. Decommissioning of top sides Catamaran Type WTS with shallow draft 10

11 . TECHNICAL SPECIFICATIONS.1 Vessel GENERAL Classification GENERAL MAIN DIMENSIONS Length over all Breadth Airgap during installation / sailing Depth to main deck (also freeboard deck) Design draught Harbour draught Scantling draught Displacement at design draught Payload (wind turbine) Payload (wind turbines foundations) MARINE SYSTEMS Main engines Total installed engine power No. of independent engine rooms Main propulsion (CPP) Tunnel thrusters Dynamic positioning class Service speed PAY LOAD* Payload (two wind turbines) Payload (two wind turbine foundations or monopiles)** Payload (0 piles, max length of piles approx. 50m)** * one of these options at the time ** minimum draft with payload of 000 mt is approx. 11.5m CAPACITIES MDO LNG Fresh water Water ballast capacity MISCELLANEOUS Complement in 1 and person cabins DNV 1A1 Wind Turbine Installation unit, DYNPOS-AUTRO 13. [m] 7.0 [m] 7. [m] 8.8 [m] 16.0 [m] 9.5 [m] 18.0 [m] Approx [mt] 000 [mt] 000 [mt] x 5.7 [MW].8 [MW] [-] x 8.0 [MW] 8 x 1.6 [MW] DP3 [-] 1 [knots] 000 [mt] 000 [mt] 000 [mt] 600 [m 3 ] 600 [m 3 ] 00 [m 3 ] [m 3 ] 100 [-]. Top side Equipment INSTALLATION TOWER / CRANAGE Main hoist fwd Main hoist aft x PMOC 1600 [mt] 1600 [mt] x 300 [mt] Note: Specifications might be subject to changes as the design progresses 11

12 HUISMAN EQUIPMENT BV Admiraal Trompstraat 3115 HH Schiedam P.O. Box AD Schiedam The Netherlands Harbour no. 561 Phone: +31 (0) Fax: +31 (0) info@huisman-nl.com