Case Studies

Deep Water Horizon Macondo Blow Out

On the 20th of April 2010 the drilling rig Deepwater Horizon exploded while drilling in the Macondo oil field Mississippi Canyon Block 252 in the Gulf of Mexico. Two days later the rig sank in approximately 5000 feet of water, by Saturday the 24th of April an oil leak was reported near the sunken oil rig and over the coming months this became the largest oil spill in US history.

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Environment Agency Marine Management

Full crewing and management of a number of the Environment Agency national Marine Management vessel, technical management of smaller vessels and rigid hulled inflatables and phased fleet renewal. This work involved the development of specifications for three 18metre catamaran vessels to provide a high degree of utility to tight budgetary constraints.

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Royal Oak Removal Programme

On October 31 1939 HMS Royal Oak was sunk by U Boat attack in Scapa Flow, with the loss of 914 sailors. At the time of sinking the vessel was loaded with a full complement of munitions and Bunker oil. The vessel lies undisturbed in 30 meters of water, and has been afforded protection under the military remains act 1986. Since the time of sinking the wreck has leaked small quantities of oil, as the hull aged, the leak increased, prompting action to remove remaining oil.

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Bruichladdich Pier Development

Briggs Marine Contractors were appointed to construct a new berthing face and mooring points to facilitate the use of the pier for larger, double skinned vessels. The new 90m long structure consisted of steelwork dolphins and access bridges, and was located perpendicular to the existing jetty head, remaining independent from the original pier.

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Future Provision Of Marine Services

Briggs Marine are contracted to develop and implement maintenance, logistic support and inventory management for the maintenance of some 220 aids to navigation and 110 heavy moorings in use by UK MoD and their permitted users.

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Oil & Gas Terminals BP

Briggs aim was to consolidate the operational requirements of 8, UK wide oils storage terminals, sea and pipe import – sea, road and pipe export and to provide single supplier resource for primary facility operational functions. Including management, operator, mechanical, electrical and administrative functions.

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HMNB Clyde Restraint Piles

The new £150m Valiant Floating Jetty was delivered from its construction base at Greenock to the Faslane Submarine Base in May 2009, with the towing and temporary securing being supervised by Briggs Marine Contractors. The jetty is 200m x 38m x 12.5m and displaces 44,000te.

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Aquila Recovery, Mallaig Opt

In July 2009 Scallop trawler Aquila caught its nets on an unchartered obstruction 20 miles SSW off Mallaig. The snagged nets resulted in a violent capsize of the vessel. Three of the crewmembers perished from injuries sustained by the capsize incident, one crewmember was rescued by a passing yacht. The MCA ETV attended the scene, however, Aquila sank shortly after.

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HMNB Clyde JSB Quay

Briggs Marine Contractors were appointed to design and construct an open piled quay comprising of an insitu concrete deck on tubular steel piles, with a gross area of 1720m.

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HMNB Clyde SSN Berthing Facilities

Briggs Marine Contractors was commissioned to construct an open piled viaduct comprising of 6 x 28m spans of precast concrete beams with insitu concrete deck and parapet. A reinforced concrete bankseat at shoreward end was supported on Universal Bearing Piles and terminates on an insitu concrete dolphin supported on 4 x 2000mm diameter piles at the seaward end.

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Aids to Navigation Manchester Ship Canal

Increasing failure rates of navigational aids in the canal had lead our Customer to take a decision to standardise the solution and to commence a process of renewal. Briggs undertook a phased renewal of the main aids to navigation on the Canal and worked closely with Peel and our Suppliers to ensure that the swiftest and most economic solution was brought to bear.

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Mossbank – Yell 11kV Cable Installation

Briggs Marine was appointed to install a replacement power cable between Mossbank and Yell. This cable forms part of SSEs distribution network around the Shetland Isles, an essential link in providing utilities to remote communities.

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MSC Chitra Pollution Response

Saturday 7th of August 2010 the bulk cargo vessel MV Khalijia collided with the container vessel MSC Chitra off Mumbai India spilling an estimated 800 tonnes of oil and 400 containers into the sea.

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New Upper Forth Crossing Access Jetties

Briggs Marine Contractors constructed two steelwork jetties to facilitate marine operations at a new road bridge crossing on the Rover Forth. The jetties were located on either side of the river and measured 32m and 170m long.

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Rosyth CVF Infrastructure Upgrade

Briggs Marine Contractors was asked to carry out the removal of temporary works installed by the main contractor, which allowed them to carry out there contract works of widening the dock gates for the new Aircraft Carriers. The temporary works to be removed included a rock bund, steel sheet piles, steel tube piles, steel tube bracing and a reinforced concrete anchor wall. These items together had to provide a protective outer cofferdam from the Firth of Forth from which the permanent works were carried out in the dry.

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Shapinsay – Stronsay 33kV Power Cable Repair

Briggs Marine was appointed to repair a failed 33kV power cable between Shapinsay and Stronsay. This forms part of SSEs distribution network around Orkney, which is essential for providing utilities to remote communities.

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Staithes Harbour Coastal Protection Works

Briggs Marine Contractors was commissioned to reconstruct the roundhead at the existing breakwater which was necessary as the rock armour blocks at the roundhead had slipped. The existing blocks were removed to allow new larger blocks to be installed at the tow and the roundhead was then reinstated.

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