Page 28: of Maritime Reporter Magazine (December 2018)

GREAT SHIPS GREAT SHIPS of 2018

THE FIRST THE FIRST

Sayaringo STaGESayaringo STaGE Sayaringo STaGE type LNG carriertype LNG carrier

Mitsubishi Shipbuilding Co., Ltd. resources, to Japan. The apple-shaped (MHIMSB) delivered the ? rst Sayar- LNG tanks are based on a highly re- ingo STaGE type lique? ed natural gas liable MOSS-type tank with extensive (LNG) carrier, named Diamond Gas track records. MHIMSB improved

Orchid in June, 2018. The Sayaringo the MOSS-type tank into an apple-

STaGE, which was developed based on like shape to increase the volumetric

MHIMSB's cutting-edge technology, ef? ciency and maximize the cargo ca- has a continuous cover over the cargo pacity along with meeting the New tanks, a feature inherited from its pre- Panamax limits on dimensions. The decessor the “Sayaendo”, and while ordinary tank consists of semi-spheres keeping this merit, incorporates apple- and a cylinder, and the apple-shaped shaped MOSS-type cargo tanks and a tank consists of a donut-shaped torus twin-shaft hybrid propulsion system as well as semi-spheres and a cylinder. “STaGE” plant, enhancing economic Because of the lower height, the center ef? ciency, environment friendliness, of gravity of the apple-shaped tank is and versatility. The Sayaringo STaGE at a lower position than the ordinary was developed by enhancing the high- one despite the same volumetric ca- ly regarded Sayaendo LNG carrier, pacity. STaGE is an abbreviation for which was also developed and built Steam Turbine and Gas Engine, and is by MHIMSB. Sayaendo retains the a hybrid propulsion plant that consists reliable con? guration and sloshing re- of an ultra-steam turbine (UST) plant sistance of spherical cargo tanks, while on the port side and a combination of integrating a continuous tank cover to a dual-fuel diesel engine (DFE) and improve the carrier’s overall structural an electric propulsion motor (PEM), ef? ciency, thus achieving a lightweight DFE-PEM plant, on the starboard side. and compact design. The Sayaendo The exhaust-gas and jacket waste heat was named after sayaendo (podded from the DFE are recovered to heat the peas) because its (pea)-like spherical feedwater going toward the UST plant, tanks are covered with a continuous achieving signi? cant improvement in saya (legume)-like cover. On the other fuel ef? ciency. In the UST plant, the hand, the Sayaringo STaGE also has a heated feedwater ? ows to the boiler to continuous cover over the tanks. The generate steam to be used to drive the reason for the naming is the upper turbine. The electricity generated by semi-sphere of the tanks is larger than the DFEs drives the PEM. Ordinar- the lower semi-sphere, and the swell- ily, a huge amount of waste heat from ing shape of the tank seems like a ringo DFEs is dumped into the exhaust- (apple) in the saya (legume)-like cover. gas and jacket cooling water. But the

Other inherited advantages are the STaGE plant uses the waste heat to lightweight hull, low-wind resistance, heat the boiler feedwater, enhancing and good maintainability. By com- the plant’s total ef? ciency. The waste bining the inherited features with the heat from the DFEs is also recycled to newly adopted propulsion system con- generate auxiliary steam as well as the cept "STaGE," the Sayaringo STaGE drive steam for the main turbine, also dramatically enhances its fuel ef? cien- enhancing total ef? ciency. As such, the cy. The Sayaringo STaGE aims to ship STaGE plant achieves signi? cant ef-

LNG from North American shale gas ? ciency enhancement by combining deposits, which have recently been in two different propulsion engines and the news regarding expansion of LNG by optimizing the waste heat energy.

28 Maritime Reporter & Engineering News • DECEMBER 2018

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