Damen delivers first-ever purpose-built offshore chasers

By Peter Pospiech at July 11, 2013 06:28
Filed Under: Company News, Shipyards

The delivery of the ‘Aquarius-G’ and her sister ship ‘Astra-G’ to offshore services company Rederij Groen marked a milestone in Offshore Support Vessel construction. Never before, such Chasers have been purpose-built.

The vessels have been designed by Saltwater Engineering in close cooperation with both Rederij Groen and Maaskant Shipyards Stellendam. Both Seismic Research Support Vessels were constructed by Maaskant Shipyards Stellendam, part of Damen Shipyards Group.

“Indeed, all our other SRS Chaser vessels so far involve converted fishing trawlers”, Henk Groen, director and proprietor of offshore company Rederij Groen notes about his new twins. “Having designed them to our specific needs right from the drawing board, significantly enhances the vessels’ deployability and performance. Their sharply reduced sway and manoeuvrability are just two examples”, Mr Groen adds.

The ‘Aquarius-G’ and sistership ‘Astra-G’ are so-called Guard Vessels or Chasers. One major task is to ensure that other shipping, mainly fishing ships, will keep distance from Seismic Survey Vessels engaged in offshore exploration. To literally chase-off. The trawlers’ nets might otherwise damage the costly seismic streamers trailing behind the survey vessels.

Dead slow

A further key activity for the SRS vessels are the alongside operations, featuring a variety of services to the seismic survey mothership. Whilst sailing alongside, such assistance includes the board-to-board transhipment of goods and equipment. The two new SRS vessels have a 2-tonne at a 10.5-metre reach deck crane. The 105 m² of free space at the aft deck provides sufficient storage capacity to include several ISO maritime containers. An aggregate 16 cubic metres of temperature controlled cells cater for other auxiliary services.

As a significant improvement, the two purpose-built Chasers feature superior nautical capabilities over the converted fishing trawlers. Their sharply lesser sway benefits both the alongside operations and the crew’s comfort.

“Seismic research is done at a sailing speed not exceeding four knots. At such low speeds, the ship needs to be both stable and maintain good manoeuvrability”, Henk Groen says. SRS vessels also measure sea current near offshore rigs to ensure a safe close passage for the seismic survey ship. “So keeping lane at very low speeds is vital for this precise work.” All of this is being put into practice as the ´Astra-G´ is currently working at its first assignment in the Barentz Sea. 

Two CAT diesel engines of type C32 Acert of each 970 kW give the ship via two fixed pitch propeller a maximum speed of 14 kn. An additional bow thruster VT-100 of maker VETH ensures max manoeuvrability. The two novel Seismic Research Support Chasers have a 40-metre length over all, 9.30 metres width, 3.30 metres draught, with accommodation for a complement of fourteen. The two vessels are classified acc to Lloyds Register IACS with the notation: Q 100A1, Ice Class 1E, EP, UMS, SCM, IWS, [Q] LMC 


Images: courtesy of Damen Shipyard

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