Svetsaren 1/2008 - Esab

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SIF Group bv at the foundation of Dutch wind energy ESAB SAW technology crucial in the production of piles and transition pieces for the Q7 North Sea wind farm. ERIC DE MAN ESAB NEDERLAND B.V. THE NETHERLANDS AND WILLIAM LAFLEUR SIF GROUP BV THE NETHERLANDS Q7 is the largest offshore wind farm in the Dutch sector of the North Sea and a step forward in the Netherlands’ renewable energy policy to boost wind energy production to 2750 MW by 2020. Sif Group bv manufactured the foundation piles and the transition pieces. Source: Offshore Windpark Q7 18 - Svetsaren no. 1 - 2008
Figure 1. One of the monopiles being driven into the sea bed. The piles are 50 or 54 m in length and the water depth is 19-24 m. Source: Offshore Windpark Q7. Figure 2. Positioning of a transition piece onto a monopile. The transition piece reaches 15 m above sea level. Acknowledgement. We thank the management of Sif Group bv for facilitating our visit to the production site. The Q7 project The Q7 offshore wind farm has been built some 23 km offshore from IJmuiden, in block Q7 of the Dutch continental shelf. It is unique in the sense that it is the world’s first located at such a distance from the coast (outside the 12-mile zone) and in deeper waters than ever before (19-24m). This was one of the reasons why its owners, sustainable energy group Econcern, and energy company ENECO Energie, selected the proven technology of the Vestas V-80 2.0 MW turbines. The project comprises 60 wind turbines with a total capacity of 120 MW. Under the Kyoto Protocol, The Netherlands agreed to reduce greenhouse gas emissions, in the period 2008-2012, by 6% relative to the 1990 levels. The Q7 project will contribute a reduction of 225,000 tonnes of CO 2 emission, annualy. Van Oord, an international dredging and marine contractor, was responsible for the installation of the wind farm; offshore erections starting in May 2007. The foundation piles (monopiles), 54 m long with a diameter of 4 m and 320 tons in weight, were driven into the sea-bed for over half their length. The transition pieces, weighing 115-tons and reaching 15 m above sea level, were placed onto the foundations using Jumping Jack, a specially designed vessel (Figures 1 & 2). The masts (105 tonnes), and the turbines (65 tonnes), are produced by Vestas and shipped to IJmuiden for erection. Sea Energy – another dedicated offshore construction vessel – transported two wind towers and two turbines at a time to Q7 for installation. To minimise turbine interaction, guidelines stipulate that the turbines must be separated by a distance of at least 5 times their rotor diameter (5 x 80m). The Q7 turbines are placed apart at a distance of 550m. Van Oord was also responsible for the installation of a 520 ton transformer substation on a monopile in the middle of Q7 - the first offshore. Q7 will be fully operational in March 2008. Sif Group bv Sif Group bv, located in Roermond, The Netherlands, specialises in the manufacture of heavy tubular structures for the offshore oil and gas industry, offshore windfarm foundations, harbour and jetty facilities, and pressure vessel shells and cones. The company has vast experience in welding, heat treatment and nondestructive and destructive testing of fine grained high strength structural steels commonly used in these industries. Sif Group bv is located on the river Maas with its own docking facilities and direct connections to strategically located main ports, such as Rotterdam and Antwerp, enabling them to ship structures of any dimension and weight, up to 800 tons, using coasters or their own river barges. Anticipating the boom in offshore wind farms, Sif Group bv invested heavily in a new yard lay-out, a new production hall for foundation piles and Svetsaren no. 1 - 2008 - 19
Page 1 and 2: THE ESAB WELDING AND CUTTING JOURNA
Page 3 and 4: Svetsaren ENERGY Articles in Svetsa
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Page 7 and 8: Template for monster platform chall
Page 9 and 10: Table 2. Preheat and interpass proc
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Page 13 and 14: Figure 11. Vertically-up welding wi
Page 15 and 16: Port of Marseille sees LNG storage
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Page 21 and 22: equipment and the welding heads get
Page 23 and 24: Zorya-Mashproekt relies on ESAB for
Page 25 and 26: 25 ±2° 25 ±2° 4 +1 ring copper
Page 27 and 28: A complete and reliable partner for
Page 29 and 30: the power source via the welding he
Page 31 and 32: the coating thickness can be reduce
Page 33 and 34: Deformation control was a major obs
Page 35 and 36: ESW Inconel strip cladding - soluti
Page 37 and 38: Mechanised pipeline welding in the
Page 39 and 40: motion, while changing from standin
Page 41 and 42: Cladding of valves for petrochemica
Page 43 and 44: Techint and ESAB Brazil - partners
Page 45 and 46: Table 2. OK 48.08 technical feature
Page 47 and 48: Manufacture of mobile gasoline tank
Page 49 and 50: Table 2. Mechanical properties: but
Page 51 and 52: Belleli Energy SpA reactors at the
Page 53 and 54: Figure 2. Cross section of an SAW w
Page 55 and 56: The Shell Gas-to-Liquids (GTL) Proc
Page 57 and 58: Quality and productivity. Weld qual
Page 59 and 60: FLEXIBLE HEAVY-DUTY SOLUTIONS FOR M
Page 61 and 62: spatter, smaller droplets and pause
Page 63 and 64: ESAB LAUNCHES NEW ORIGO WELDING MAC
Page 65 and 66: TRAMTRAC TM II - A COST-EFFICIENT A
Page 67 and 68: OK FLUX 10.77 - SPIRAL PIPEMILL FLU
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OK FLUX 10.18 + OK BAND NICU7 NEW A
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