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CSSC COMPLETES FIRST WINGD X-DF ENGINE MAJOR OVERHAUL IN NINE DAYS

Thursday, July 23, 2020 

CSSC Marine Service (CMS), the equipment service subsidiary of China State Shipbuilding Corp (CSSC), has completed the first major overhaul on two WinGD X-DF engines in only nine days.

The twin 6X62DF engines overhauled by CMS belong to the first ever X-DF powered vessel in operation, 2017-built 180,000m3 LNG tanker, SK Audace (owned and operated by SK Shipping Co), which was anchored at the Sabine Pass anchorage in Texas.

In the three years since vessel delivery, the X-DF engines installed on SK Audace had reached 18,000 operating hours, over 99% of which were gas operation and under 1% Diesel operation required for manoeuvring.

The CMS Korea team completed the two engines full maintenance within nine days, and the ship returned to commercial service after a successful sea trial run. The simplicity of the X-DF engine for maintenance, coupled with the skill and dedication of the CMS team was said to have enabled the fast overhaul time.

Although work scopes were varied, CMS and WinGD collaborated to execute the job according to the standard manual for that engine type. Original spare parts such as piston rings and gas components were delivered to the vessel’s location by CMS.

During the overhauls, no abnormalities were found. However, the team overcame the challenge of the unknown and being the first ever to perform maintenance on X-DF technology. The CMS Korea team prepared their work guidelines well which included the reservation of correct materials and real-time support from the WinGD design team. In doing so, the CMS Korea team solved all challenges encountered and were able to reduce the maintenance time to nine days. The CMS Korea team also observed that the 6X62DF engine parts were in good condition compared to engines historically overhauled by CMS that operate on heavy fuel oil (HFO).

Following the overhaul, the trial run of the engines was performed and optimised engine performance was calibrated.  The overhaul included more complex gas components such as gas admission valves (GAV), pre-chamber replacements and gas valve units (GVU).

In total, 10 X-DF engines on five vessels will be overhauled by CSSC Marine Service in the coming months. Results of the ongoing condition-based investigation on all five vessels will enable increased TBO (time between overhaul) or CBM (Condition based Maintenance) decisions, to be agreed between the ship owner and classification society.

Andrew Stump, President CMS said: “For customers who operate X-DF engines and have concerns about service accessibility, CMS is able to provide qualified service through our growing network. This is the first X-DF major engine overhaul completed and our team provided such a short turnaround time for a twin-engine installation. that truly proves what is possible. As the demand for our services grows, CMS will continue its expansion into more locations worldwide."

To-date, CMS has established three service hubs located in South Korea, Singapore and Hamburg, and five service stations located in China (Qingdao, Gaungzhou, Chengxi and Shanghai), South Korea, Singapore, Hamburg and Switzerland.

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