Superyacht puts on weight send in the dredgers

Jenkins Marine's Doreen Dorward was mobilised for the special task (Peter Barker) Jenkins Marine's Doreen Dorward was mobilised for the special task (Peter Barker)

Jenkins Marine has taken part in an unusual dredging operation in Portsmouth to aid the return to the water of a superyacht which put on extra weight following modifications.

The luxury superyacht Shemara has spent several months at the Burgess Marine site at Trafalgar Wharf Portchester at the north end of Portsmouth Harbour, undergoing a complete refurbishment. The yard employs their 1,000t shiplift to transfer ships to and from the water, but following the extensive fit out and modifications to the Shemara it was found that the vessel had put on weight and was several hundred tons heavier than when it arrived. The consequential deeper draught required the shiplift to go deeper into the water to allow the vessel to float free. Siltation had however taken place in the backwaters of Portsmouth harbour meaning the shiplift was unable to go down as far as originally designed. Jenkins Marine therefore came to the rescue in a priority dredging operation.

The conventional method of using a backhoe was problematic as dredging was required in the 15m wide and 53m long area occupied by the shiplift resulting in the requirement to dredge beneath the structure. Jenkins Marine mobilised their dredger Doreen Dorward for the task, equipped with their 35t excavator. Burgess Marine assisted by fitting a 10t double drum hydraulic winch and power pack to the vessel’s foredeck enabling the use of a dredge plough to reach beneath the shiplift. The excavator dug a pit at the front of the dock with the dredge plough dragging material into the pit.

Excavated material was loaded into the attendant 150m3 split hopper barge Hurst which was towed to the disposal ground at Nab Tower by Jenkins Marine’s 15t bollard pull tug Handfast. The hopper barge discharge operation is controlled remotely from the tug. Dredging and disposal operations involved a 24/7 tidal working basis, dredging being completed over the low tide and sea disposal over the high tide periods. Burgess Marine were reported to be very pleased with progress especially as only one week’s notice was given prior to award of the works.

Latest Press Releases

Damen announces fourth edition of its popular annual networking event

Damen Workboat Show is rebranded as Damen Maritime Festival Read more

Van Wijngaarden Marine Services places order for its first Damen Multi Cat DP1

Van Wijngaarden Marine Services places order for its first Damen Multi Cat DP1 Read more

InvaSave proves ready to help vessel owners in time for Ballast Water Management Convention deadline

The InvaSave mobile ballast water treatment system from Damen Green Solutions has demonstrated beyon... Read more

Portico and SMS Group partner in short stay ship repair

The SMS Group, one of the country’s leading ship repairers and marine engineering services providers... Read more

Two more Damen tugs for Ecuador harbour support

Delivery of two ASDs increases DLEN’s fleet to six Damen tugs Read more

Rugby World Cup 2019 favourites visit HST newbuilds at Damen Shipyards Antalya

On 22 August, Damen Shipyards Antalya had the pleasure of a visit by members of the Welsh national r... Read more

View all