Location: Pembroke, South Haven, Wales
Client: RWE npower Engineering, Directional Drilled Crossing, Pipelines and AGI Construction Design, construction and installation of a 4.25km x 18" gas pipeline from Blackbridge, Milford Haven to Pembroke Power Station. Works included a 3km intercept horizontal directional drill under the Haven, landlines and the construction of 2No. AGI's. Location: Tetney, Humber Estuary, England Client: ConocoPhillips Engineering, Tanker Terminal and Sealines Tetney Sealine Remedial. Repair work a section of the 36" submarine sealine which runs from the Tetney Oil Terminal to a Pipeline End Manifold (PLEM) and buoy, some 4km offshore in the Humber Estuary. Work involved removal of concrete weight coating, bitumen layer and cleaning of the pipe surface to allow the fitting and grouting of 3 sleeve clamps. Close co-ordination with tanker off-loading operations were required. Operations were undertaken on a 24 hour/day basis in an area susceptible to currents of up to 3 knots. U to 27 divers involved during specific periods of the work. Location: Larne Lough, Co. Antrim, North Ireland Client: Phoenix Natural Gas Engineering River / Estuary Crossing Design and construction of the 1.9km by 219mm diameter pipeline crossing of Larne Lough, a further phase of PNG’s scheme to bring natural gas to Northern Ireland. After completion of dredging, the pipeline was installed across the Lough by the bottom tow technique utilising a 300 tonne linear winch on barge LM Constructor Location: Elgin/Franklin Fields, Central North Sea, UK Client: Elf Exploration UK PLC Engineering, Construction and Installation of Bundles The engineering, procurement, fabrication and installation of a 5.2km inter-field flowline bundle, umbilicals and power cables. T he bundle was constructed at the Tain fabrication facility where the 2 No. 314mm CRA lined flowlines, insulated using a pipe-in-pipe system, were inserted into the carrier pipe. A bundle was chosen as it offered the best solution to the technical problems associated with the high temperature/ pressure gas & condensates to be recovered. The bundle was launched using a tug and then towed the 300km to the field by the controlled depth tow method. A riser caisson with an active cooling system was also fabricated for the Franklin platform. The bundle was tied in to the field platform risers using hyperbaric welding techniques. The umbilicals and power cables were laid and trenched in a separate operation. Location: Dalmeny Terminal, Firth of Forth, Scotland Client: BP Grangemouth (s/c to AMEC Process and Energy Ltd) Engineering, Tanker Terminal, Sealines and Pipelines Design and Construction of a Marine Vapour Recovery system at Dalmeny Terminal. 16” dia vapour pipeline, 4” dia LPG/water pipelines, 3” dia nitrogen pipeline with 7 No. power & instrumentation cables were fabricated into a 660m long bundle and pulled out to the jetty, where a riser was installed and connected to the bundle6km of marine pipelines and risers to marine platform. The pipelines and umbilicals were then back laid 2600m to the terminal. Location: Britannia Field, Central North Sea, UK Client: Britannia Operator Ltd (by the Land & Marine - Stolt Alliance) Engineering, Construction and Installation of Bundles The fabrication and installation of 2 No flowline bundles by the "controlled depth tow" method and the separate installation and trenching of 2 No control umbilicals. The bundles were constructed at the Tain fabrication facility where 4 No flowline pipes were inserted into an insulated steel carrier pipe and included SSIV and manifold towheads and a midline offtake 'T' structure. The bundles were individually launched by barge winching into the sea and trimmed in the Dornoch Firth prior to towing to the offshore site. The bundles were docked together on the seabed in 150m water depth, to form a continuous length of 15.1km connecting the subsea production centre to the Britannia Platform. The carrier pipe was externally insulated for heat retention of hot water circulation within the carrier/bundle annulus. Bundle details: 946mm insulated steel carrier pipe containing -356mm production; 219mm test; 89mm methanol and 342mm hot water circulation pipelines. Location: Liverpool Bay, Irish Sea, England Client: BHP Petroleum Ltd Tanker Terminal Installation of a nine point chain anchorage for a 250,000 dwt CALRAM (catenary anchor leg rigid arm mooring) for a permanently moored 117,000 dwt oil storage vessel + 100,000 dwt shuttle tanker forming part of the Douglas Oil Field development in Liverpool Bay. Each anchor was embedded to a 600 tonne test load. Location: Walney Island and Barrow-in-Furness, Cumbria, England Client: British Gas Engineering River / Estuary Crossing Part of the North Morecambe Field development. Installation of a 3.7km x 914mm dia gas pipeline across the Walney Channel between Westfield Point and Walney Island. An 89mm steel methanol pipe and an 11kv power and fibre optics cable were strapped to the pipeline. Work involved pre-dredging the 600m wide channel and post lay lowering the pulled pipeline across the mud flats. A 1.4km land section was laid to the reception station and a further 1.1km x 219mm commissioning pipeline installed from the pigging station. Location: Gannet Field, Central North Sea, UK Client: Shell UK Exploration & Production Engineering, Construction and Installation of Bundles The fabrication and installation of four flowline bundles by the "controlled depth tow" method. The bundles were constructed on a specially prepared site at Tain and each bundle of pipes was inserted into a carrier pipe. When positioned at the field the annulus between the carrier and the inserted lines of each bundle was filled with a pumped gelling fluid for thermal insulation of the flow/gaslift lines. The bundles were individually launched by barge winching into the sea and trimmed prior to fore and aft tug tow them 300km to site in the Central North Sea. Bundle details: 3.15km x 927mm dia carrier with bundled 6 x 127mm, 6 x 60mm, 2 x 178mm dia 3.64km x 927mm dia carrier with bundled 6 x 127mm, 6 x 60mm, 2 x 178mm dia 2.23km x 735mm dia carrier with bundled 4 x 127mm, 4 x 60mm dia 2.64km x 735mm dia carrier with bundled 4 x 127mm, 4 x 60mm dia Location: River Humber, England Client: British Gas Engineering River / Estuary Crossing Construction of 3.2km x 1066mm gas pipeline crossing of the river, including an additional 2km of landline. Pipeline bottom towed into position by land-based winches. Location: River Forth, Scotland Client: Essochem Olefins Inc Engineering River / Estuary Crossing A 6.1km twin-products pipeline crossing. Work involved installing 273mm and 222mm dia steel pipelines in a simultaneous pulling operation. The pipe trench was pre-dredged and later backfilled. Location: Firth of Forth, Scotland Client: British Gas Engineering River / Estuary Crossing Pre-trenching of 2.5km southern and 1.5km northern landfalls by land equipment and dredger and the pull ashore of the 1066mm dia gas pipeline from a laybarge. The southern approach pulled into position by 1200 tonne winch set up. Hydraulic testing of the entire line and dewatering completed the work. Location: River Tay, Scotland Client: British Gas Engineering River / Estuary Crossing and Trenching 7.7km x 1066mm dia mild steel concrete weight coated gas pipeline crossing of the Tay estuary. The main 4.3km section pulled into position by a 1200 tonne winch set up. A 2km beach section jetted into the seabed with the remaining length being by landline construction Location: Cul Ness to Firth Ness, Shetland Islands, Scotland Client: BP Petroleum Development Ltd Engineering River / Estuary Crossing 4km oil pipeline crossing, being part of the main line from the Ninian Field. 914mm high yield steel pipe was coated, wrapped and concret weight coated. Pipe pulled was by two land-based winches located at Firth Ness into a prepared trench in the seabed and in rock at the landfall sections
Location: River Mersey, England Client: Mersey Docks and Harbour Company Engineering, Tanker Terminal, Sealines and Pipelines Design, construction and installation of 6 No. 750m x 342mm dia oil product discharge lines and the installation of a CBM terminal - later managed and operated by Land & Marine Engineering. Consulting Engineer: LME |