WTS completes Seishu Maru LNG gas trial

WTS completes Seishu Maru LNG gas trial

Wilhelmsen Technical Solutions said it has passed an important milestone by successfully completing the gas trial for the first LNG carrier built to a Boil Off Rate (BOR) of 0.08% per day. 

WTS subsidiary company Ti Group completed the test on the LNG carrier Seishu Maru, built at Mitsubishi Heavy Industries in Japan for NYK Line.

Ti Group was responsible for supplying the cargo tank insulation system on Seishu Maru, one of six LNG carriers to be delivered in this order. The vessel is a next generation Sayaendo design vessel, with a cargo capacity of 150,000 cubic meters. This unique design features four spherical Moss tanks protected by a continuous cover integrated with the ship’s hull.

The ship passed its gas trial and was delivered to the owner in late September 2014. Ti Group Managing Director Anstein Sorensen says the ship’s insulation system received no specific comments during the trial, indicating a very satisfactory performance.

“The gas trial is one of the critical tests to pass before the ship can be handed over to owner because it proves that the vessel’s containment system, including the insulation, is working correctly,” says Sorensen. “Passing the test at a BOR of just 0.08% is a milestone for the project and sets a standard that reflects our knowledge and expertise in this area.”


Press Release, October 20, 2014; Image: NYK

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7 thoughts on “WTS completes Seishu Maru LNG gas trial”

  1. It would be interesting to learn more about this vessel. The daily loss at .08% of the 150,000 cubic meters of LNG is a release of 120 cubic meters of natural gas. On a vessel this size, couldn’t the BOG be effectively captured from the PRV’s and routed (piped) back to on-board cryogenics compressor to be reclaimed? The compressors themselves could be powered by the BOG as well as provide supplemental fuel for the massive diesel engines (this may already be happening?) Total capture and reuse of BOG would make this vessel close to carbon neutral rather than releasing to atmosphere.

  2. Thank you for that piece of information Atiq. For those of us not familiar with this type of bulk transport of LNG it seems including that point within the press release would have been very impressive. The focus is on the.08% BOR, the next piece of information should indicate “compared to what previous standard?”. You state that BOG is complete capture for propulsion; Is this true for all vessels of this type, or another advancement for this design? This story misses a big opportunity to educate the public.

  3. Hi Chris, previous industry standards for BOR were in the range of 0.15%/d on the conventional LNG tankers. By conventional I mean those propelled by Steam Turbines. BOG is burned in the boilers to generate steam with in turns moves the turbines. Hence no BOG is lost into the atmosphere.There are ships which are using BOG reliquefaction
    stystems with diesel engines combination for propulsion. The Seishu Maru along with the 0.08%/d BOR boasts a UST reheat boiler which furtherer increases the efficiency
    of the plant. On LNG tankers BOG utilization is achieved depending on the type of propulsion. If a Steam Turbine propelled ships the BOG is burned in the boilers for propulsion, if a DFDE (Dual Fuel Diesel Electric) type propulsion then BOG will be the Fuel for the DF engines in to produce the required electrical power and if it is a Slow-speed Diesel engine propelled ship then there will be a BOG reliquefation system.

  4. hi prashant

    would you know this ship consumption at mcr/ncr? older steam turbines need abt 325 m3/day for ncr.

  5. hi chris

    reliq business is not as straightforward as it seems; rasgas has been having a nasty experience with reliquefying ships. it is a wonder that a (large) lng exporting company could buy exxon advice for building motor ships (running on heavy fuel), instead of steam turbine ships. they are having second thoughts now, intending to replace motors with wartsilla’s 2/3fde’s.

  6. Thank you for the benchmark statistic Prashant. Indicating the % of reduction within the original press release would have shown the reader the significance of the advancement.

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