Three vessels owned by Cork-based Irish Mainport Holdings underwent main propulsion diesel overhauls, while a fourth was scheduled to undergo its five-year special drydock survey
Engineers from UK-based marine engineering and diesel engine specialist Royston completed major overhauls on two Bergen KRM9 main engines on board 66-m offshore support vessel Ocean Spey as part of a planned maintenance programme. Based on a UT 719 design and built in 2000 by Ulstein Verft in Norway, Ocean Spey (ex Havila Star) underwent the overhaul while docked in Cork Dockyard. The servicing involved the engines being disassembled to install overhauled cylinder heads, fuel pumps and injectors. Valves, pistons and connecting rods, cylinder liners, bearing blocks and crankshaft were also checked, and essential repair and replacement work carried out before reassembly and inspection of the engines.
Similar work to overhaul two Niigata 6L28BXE main engines on board 37-m tugboat MT Celtic Rebel was completed as part of package of engineering support provided by Royston. This saw the removal and inspection of two units, overhaul of the fuel injection equipment and 12,000-hour overhaul on two NHP30 turbochargers.
In 2020, Royston engineers serviced two Cummins KTA38 propulsion engines on board tugboat Mainport Kells as part of scheduled maintenance and refurbishment ahead of the boat being transferred to new owners in France. This also saw the replacement of 12-cylinder heads with service exchange heads as part of the 50,000 running hours service of the main port engine.
Engineers carried out incremental load testing in line with the engine manufacturers’ specifications on all the vessels following the work’s completion.
Prior to its sale, Mainport Kells had worked as a chase boat in the seisimic survey sector for seven years while part of the Irish Mainport fleet. Ocean Spey and Celtic Rebel are currently part of a fleet of survey and research ships, seismic support vessels and tugboats owned and operated by Irish Mainport Holdings, which provides marine services to shipowners, exporters, importers, oil companies, survey companies and offshore wind companies.
Irish Mainport Holdings entered the offshore wind market in 2020 with the acquisition of the dynamic positioning class-2-capable, 50-m survey and research vessel Mainport Geo. In December, Irish Mainport said the Marshall Islands-flag vessel would undergo its five-year special drydock survey at Cork Dockyard.
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