A Dutch company that operates a unique fleet of accommodation, heavy-lift and decommissioning units has unveiled a new jack-up design, as has GustoMSC, both designs being aimed at the offshore oil and gas and renewable energy applications
In November 2017, OOS Energy, part of Holding OOS International Group BV in the Netherlands, unveiled the design of a dynamic positioning jack-up vessel it plans to build. Somewhat prosaically dubbed the ‘multi-activity unit’ (MAU), the self-propelled, dynamic positioning (DP) jack-up is capable of undertaking a wide range of services.
In the offshore oil and gas industry, the new unit can be equipped with a high-efficiency plugging and abandonment (P&A) package able to undertake well intervention/workover drilling operations but also has significant accommodation and two 1,200-tonne cranes that can support the removal of the majority of platforms in the southern North Sea or other areas in the world with water depths of up to 80 m. In addition, the new unit can transport and offload structures without support from other vessels or heavy-lift equipment. OOS Energy said its design and lifting capability can also be used in the offshore wind energy sector for installation of monopiles, jackets and turbines.
“The strength of our concept lies in combining P&A with heavy-lift operations of up to 2,400 tonnes without the need for a marine spread or mobilisation of multiple vessels, thus reducing costs,” said OOS International’s chief executive Léon Overdulve. “The MAU will be available to all parties involved within the P&A/decommissioning and wind installation market. Discussions are well underway with potential clients recognising the efficiency of this unit,” he said.
OOS Energy is finalising equipment packages for two MAUs and is in final discussions with shipyards for the construction of two units with an expected availability in Q4 2020 and Q1 2021. The first unit is to be named Luctor et Emergo.
Shortly before OOS Energy released details of its jack-up, GustoMSC unveiled an installation jack-up vessel design intended for the Jones Act market in the US, the SEA-3250-LT.
“Currently, there is no equipment available in the US that is capable of installing existing and future heavy foundations and turbines, due to insufficient carrying and lifting capability in terms of both capacity and height,” said GustoMSC.
“The SEA-3250-LT is a dedicated low-capex wind turbine installation solution for the emerging US offshore wind market. It is a rationalised jack-up design, pared down to the essence of safe and efficient wind installation.”
The SEA-3250-LT utilises an efficient, lightweight hull in order to maximise variable load capacity. It can carry one or two of the largest turbines whilst underway to an installation site.
“The relatively simple and straightforward design can be built by multiple US shipyards without big risks and can therefore be built Jones Act compliant at a competitive price,” said GustoMSC.
“This non-propelled design meets the required technical capabilities for wind turbine installation in the US for a minimum investment, thus reducing investment risk in this developing market.”
The design uses a proven GustoMSC hydraulic ‘pin in hole’ jacking system capable of the large number of jacking moves required for offshore wind turbine installation.
An 800-tonne pedestal crane fitted with a boom of approximately 100 m enables the installation of the latest generation of 8–9.5 MW turbines and foundations.
In the case of foundations exceeding the capabilities of this particular crane, the unit can serve as a Jones Act-compliant feeder solution to a larger foreign vessel.
The SEA-3250-LT is designed to operate in the typical environmental conditions of the US northeast coast and in water depths of up to 45 m.
“Its large payload and large free deck area make the SEA-3250-LT a very versatile unit, capable of executing projects in civil construction, oil and gas, decommissioning and maintenance fields, along with wind turbine installation work,” the company said. It can also be upgraded with a full accommodation block and its own propulsion.