Royston Wraps Up Seven Atlantic’s Engine Overhaul

Royston has completed the work on overhauling diesel engines for the Seven Atlantic diving support vessels.

Engineers undertook the major service on the generator engines onboard the 140m long Subsea 7’s Seven Atlantic, as part of a comprehensive refurbishment and maintenance programme of critical power plant.

The work by Royston saw the Wartsila W7L32 diesel generator No.5 disassembled to install new cylinder heads, air start valves, indicator cocks, injectors, and cylinder seals.

Relief valves, pistons and conrods, cylinder liners, bearing blocks, crankshaft and turbocharger were all sent to company’s Newcastle work shop for checking and essential repair work before being returned ahead of the final reassembly and inspection of the engine.

Engineers also overhauled the turbocharger on the Wartsila W7L32 diesel generator No.3, the company said.

The NA297 Napier turbochargers from both engines were removed, stripped, cleaned, inspected and balanced at Royston’s specialist test and repair facility, which features a Schenk H3BU horizontal balance machine alongside an IRD B5OU-290 instrument as part of a precision instrumentation capability to increase balance testing.

Following completion of the servicing work, incremental load testing in line with the engine manufacturer’s specification was also completed by engineers.

Shawn Doering, Royston’s service manager on the contract, said: “Our experience with the engine and vessel type ensured the work was carried out efficiently and effectively, enabling the vessel to return to sea-going operations as quickly as possible.

“Vessel operators can save upwards of 30% when using service providers like Royston without compromising the quality and standard of engineering work provided.”

Seven Atlantic’s power plant package comprises six Wartsila 7l engines, each driving a 3360kVA Van Kaick generator, generating 6,6 kV (mains voltage).

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