Marsun Grows Their Crewboat


Cummins Vessel Reference #625

Marsun's 40-meter crew boat.

Thailand’s Marsun Co. Ltd. has built a reputation for quality high speed patrol craft and crewboats. Having built a number of their in-house designed 36-meter crewboats, they launched a 40-meter version earlier this year.

Delivered in February the Uniexpress 18 went into service in the Gulf of Thailand for owner Uniwise Offshore Ltd. transporting up to 70 workers to and from oil rigs. In addition to personel the boat can carry up to 50 tons of cargo on the 120 square-meter after deck. Tankage is provided for 50,000 liters of fuel and 20,000 liters of water.

Propulsion for the 40-meter crew boat is the same as that for Marsun’s 36-meter model. This is provided by three Cummins KTA38-M2 diesels each delivering 1350 BHP at 1950 RPM. The engines turn 1050-mm diameter Ni-Al-Bronze propellers through Twin disc MGX-6690SC gears with 1:2.47 ratios.

One of the fire monitors mounted aft of the deck house.

This power package pushed the boat at 23 knots at loaded 30 tons dwt with an 18-knot cruising speed. Interestingly the 40-meter long by 7.6-meter wide hull achieved over a knot more speed on sea trials than the 36-meter version of the 3.6-meter deep hull.

Accommodation is provided for a crew of ten on the Uniexpress 18, which has electrical power provided by a pair of 80 kw generator sets.

For further information:

Mr. Sompope Chokchaiyakool
Marsun Co. Ltd.
413 Moo 4 Soi Sitthichai,
Tai Ban Rd.
Amphur Muang,
Samutprakarn 10280 Thailand
Phone: 66 2 1738942

Uniwise Offshore Ltd.
25 Alma Link Building,
11/F Soi Chitlom, Phloenchit Rd.
Lumphini, Pathumwan,
Bangkok 10330, Thailand
Phone: 66 2 254 8400

Alan Haig-Brown

Alan Haig-Brown

Over 30 years as an author for global commercial marine and fishing publications backed with hands-on experience on commercial fishing boats and coastal freighters makes Alan Haig-Brown uniquely qualified to provide vessel reference articles for Cummins Marine. You can find him in shipyards around the world, and on his own website,

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