Diving services support for Liverpool Bay offshore installation

Fendercare Marine wins significant contract to provide diving services, personnel and equipment for the Liverpool Bay Development in the UK.

The Liverpool Bay Development comprises four oil and gas fields, together with significant offshore and onshore facilities used for extracting, transporting and processing these reserves.

Fendercare Marine Diving Services mobilised the DPII Diving Support Vessel “Seabed Worker”, complete with a full air diving and nitrox surface demand diving spread, two work class ROVs, a complete pipeline hydrographic survey facility and the James Fisher Hydro-Digger (mass flow excavator) for survey and remedial works to the assets located offshore in Liverpool Bay. The work scopes included the hydrographic surveys and mooring integrity surveys.

Offshore operations at Liverpool Bay are focused on the Douglas complex - a facility which monitors and controls the development's three unmanned satellite platforms at Lennox, Hamilton and Hamilton North, with oil and gas from all four fields being received at Douglas. The Lennox and Douglas fields produce oil which is sent through a pipeline to the offshore storage installation before being loaded into tankers for export worldwide.

As part of the work conducted by Fendercare Marine Diving Services, pipeline routes were surveyed and a full condition report submitted on completion. The survey team also identified the locations of the three joining links attaching the mooring chains to the anchor wires on three moorings between the CALRAM and its anchor buried in three meters of seabed. These links were excavated by the James Fisher hydro-digger, raised by ROV, and NDT inspected. 

Pre-selected areas of nine mooring chains were also cleaned and inspected between the surface and seabed by ROVs and divers. Remedial works and maintenance procedures were also completed on the pipeline end manifold (PLEM) and the main safety chain in preparation for change out later in the year. 

All diving and marine operations were carried out in compliance with the Offshore Approved Codes of Practice (ACOP) as defined within the HSE Diving at Work Regulations 1997 and IMCA recommendations.

Established in 2010, Fendercare Marine Diving Services provide a complete range of diving services, equipment and ROVs, to install, inspect, maintain and remove underwater structure of all types, and it has full membership accreditation from the International Marine Contractors Association (IMCA). It has built up extensive experience of supporting shipping companies, offshore operators, onshore facilities and other businesses or authorities requiring underwater work to be carried out.

This is not the first time that Fendercare Marine Diving Services has provided support to the Liverpool Bay Development. It has also been contracted to provide the diving facility together with associated operational procedures and risk assessments for the change out of the 24 tons of safety mooring chain with a Salentic line. For this operation Fendercare Marine Diving Services was asked to operate utilising its platform based air diving spread deployed to the offshore installation.

The work scopes included procedures for the cleaning and inspection of the main securing pad eye attached to the buoy, located in the splash zone 2m below the surface. The pad eye attachment welds and first three chain links were cleaned to enable inspection divers, utilising underwater magnetic particle inspection (MPI) equipment, to inspect the pad eye attachment welds and links. On confirmation of the pad eye integrity and fitness for purpose, the chain was rigged for removal and secured at both ends prior to being cut free from under the buoy and recovered, and a replacement Salentic line was rigged and installed.

Fendercare Marine Diving Services director, Bob MacMillan, commented;

“We are very proud of our involvement with the Liverpool Bay development and our work demonstrates the wide range of services and equipment we can offer our customers. All of our diving teams are trained and experienced in a wide range of techniques and procedures and safety is paramount in everything we do."