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Wärtsilä 34DF dual-fuel main engine to power first CNG carrier vessel

The world’s first carrier vessel for compressed natural gas (CNG) is to be powered by an integrated Wärtsilä propulsion system. (Earlier post.) The new vessel will feature a 9-cylinder Wärtsilä 34DF dual-fuel main engine operating primarily on gas. Wärtsilä will also supply the controlled pitch propeller and gearbox, all of which will be fully integrated so as to optimize the propulsion efficiency.

CNG Hantong
The first carrier vessel for compressed natural gas (CNG) is to be powered by an integrated Wärtsilä propulsion system. Click to enlarge.

The vessel is being built at the Jiangsu Hantong shipyard in China, ordered by CIMC ENRIC and designed by CIMC ORIC for end user Perusahaan Listrik Negara (PLN), the Indonesian state owned energy company. The order with Wärtsilä was placed during the fourth quarter, 2014.

This will be the first dual-fuel powered vessel owned by an Indonesian ship owner. The Indonesian government’s policy is to promote the utilization of natural gas as a marine fuel because of its environmental advantages.

The 110-meter carrier is scheduled to be in operation in May 2016 and will transport CNG from Gresik in East Java to the Indonesian island of Lombok where the gas will be used to fuel a power plant.

The Wärtsilä 34DF is manufactured in configurations of from 6L up to 16V giving 500 kW per cylinder and a total maximum mechanical output of 8000 kW. The engine speed is 750 rpm.

When operating in gas mode, the Wärtsilä 34DF engine is already compliant with IMO Tier III regulations without any secondary exhaust gas purification systems. Also when fueled by gas, the SOx and CO2 emissions are notably reduced, and smokeless operation is attained.

In liquid fuel oil mode, the Wärtsilä dual-fuel engines are fully compliant with the IMO Tier II exhaust emissions regulations set out in Annex VI of the MARPOL 73/78 convention. The engine is able to operate efficiently and economically on low sulphur fuels (<0.1% S, <1000 ppm), making it suitable for operation in emission-controlled areas.


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