Type 0 Super Vessel, Dockwise Vanguard, Provides 110,000 Metric Tonnes of Possibility
a report by
Renee Pellemans Dockwise
Within the Oil & Gas industry’s three principal segments, (exploration, production, and processing), Dockwise clients typically engage in the following activities:
As a result of providing innovative services in these areas, Dockwise began to study the feasibility of investing in a new semi-submersible Super Vessel that is capable of helping clients meet their needs for bigger, integrated structures. The Dockwise Vanguard (see Figure 1) will be the first of its kind for the maritime transport industry, and will make the perfect addition to the impressive Dockwise feet. The vessel will have an overall deck size of 275 x 70 m, a revolutionary bowless design, and a carrying capacity of up to 110,000 metric tonnes.
The business rationale for deciding to build this new vessel is based on current trends for upcoming projects in the Oil & Gas industry, which indicate that there is a need for this type of larger vessel. “Exploration and production is shifting from more shallow waters in traditional areas to extremely deepwater Floating Production Units (FPUs) and more remote areas. Furthermore, the demand in the industry is for larger, heavier equipment, which can be built as a completed, integrated unit,” says Dockwise Managing Engineer Michel Seij (see Figure 2).
According to Seij, currently, floating production structures, like tension leg platforms and semi-submersible platforms, and gravity-based structures with a deadweight of more than 50,000 metric tonnes must be transported separately and integrated or even built at the destination. Other production structures, like SPAR buoys, (see Figure 4) can only be transported to a certain size. The latest newly built Floating Production, Storage and Offloading (FPSO) and semi-submersible crane vessels have to be tugged to their destination.
The maximum carrying capacity of the current biggest semi-submersible heavy lift vessels in the world goes up to 50,000 metric tonnes. Only the Dockwise vessel the Blue Marlin (see Figure 3) can transport, in specific cases, structures up to 73,000 t (depending on the vertical centre of gravity).
The Blue Marlin is 225 m long, with a width of 63 m, and a maximum water above deck of 13 m. Dockwise concluded that if it could offer a vessel to transport these larger offshore cargoes as integrated structures, it would significantly reduce risks and insurance costs, as well as expensive offshore man hours for hook-up and commissioning for clients. In addition, time to production could be significantly reduced. From experience, Dockwise has also learned that a new vessel with even larger dimensions will trigger new design opportunities within the industry.
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Going Where No One Has Gone Before
A key target market for the new Dockwise Vanguard are all offshore structures between 50,000 and up to 110,000 metric tonnes. These structures can be categorized in floating production structures for water depths of more than 1,500 feet (Tension Leg Platforms, Semi-Submersible Platforms, and SPAR buoys), gravity based production structures for shallow water depth (less than 300 feet) in harsh environments, FPSO’s, floating liquefied natural gas (FLNG) structures, and semi-submersible crane vessels. Dockwise has recognized a significant number of unique projects for the Dockwise Vanguard in upcoming years.
But it’s not only the Dockwise Vanguard’s size that makes it unique. The vessel also has a revolutionary innovative design: It has no bow. In addition, the Dockwise Vanguard’s design makes use of its optimal deck length and provides more flexibility. The accommodation block and navigation bridge are located on the extreme starboard side (See Figure 5). The vessel has a dedicated design for ultra heavy semi-submersible production platforms. This includes optimised deck strength, extreme wind load capabilities, and stability characteristics to carry the state of the art semi-submersible production structures in line with the latest air gap requirements. There will be two diesel electric main propulsion trains. In addition, there will be two azimuthing thrusters on the ship. “There is no self-propelled vessel of this size in the market and we are keen to provide a solution that will meet the needs of our clients in the Oil & Gas industry all over the world for decades to come,” says André Goedée, Dockwise CEO (see Figure 6).
The Dockwise Vanguard can also serve the top end of the current market for structures between 25,000 and 50,000 tonnes, as it is better equipped to transport the latest fifth and sixth generation semi- submersible rigs, due to its large maximum submersible draft of 16 m. Also, structures with a very high vertical center of gravity are best suited for transport onboard the new Super Vessel. Its innovative construction has unlimited potential for the future as well. “The construction of our new vessel will change the opportunities for clients to build their structures completely integrated,” Seij says. “This is not only interesting from a cost perspective, but it’s also interesting for platforms in remote areas, where there is basically no integration infrastructure. In addition, we have the flexibility to transfer larger modules and cargoes around the world. This means we can really go where no one has gone before – and focus on challenging projects in harsher climates in remote areas such as West Africa, and Western Australia. This will afford us new opportunities in the LNG market as well.”
New Horizons and New Opportunities
For the Oil & Gas processing market, marine transport services are required for heavy onshore structures, such as modules for LNG plants, refineries, and petro-chemical plants. Transporting large
© TOUCH BRIEFINGS 2011
Transportation & Logistics
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