Low emissions vessel engines unveiled to cut owner fuel costs

Engine manufacturers have introduced new workboat ranges enabling greater flexibility for power, performance and emissions reductions.

MAN Engines introduced a dual-fuel engine for fast workboats and small tugboats for diesel and hydrogen consumption. Its D2862 four-stroke engine has 12 cylinders in V arrangement, single cylinder heads, direct diesel injection and hydrogen injection into charge air and an exhaust aftertreatment system for IMO Tier III compliance.

Weighing 2,270 kg, this 1,940-mm engine can produce 750 kW of power at 2,100 rpm and has a stroke of 157 mm and a bore of 128 mm. It has a displacement of 24 litres and a rated torque of 3,406 Nm.

MAN says the engine can run 4,000 hours per year at an average load of up to 60%. There is a single turbocharger with charge air intercooler and wastegate, while the engine is seawater cooled by a rubber impeller pup or two-circuit cooling system.

A representative of MAN UK distributor PME Power Systems told Riviera Maritime Media this range could be extended with V12 engines at lower power and running speeds for other workboat applications in the next few years.

AGCO Power has developed a new diesel engine with power range of 155-201 kW with an aftertreatment system for compliance with IMO Tier III and European Union Stage V emissions requirements.

UK-headquartered Mermaid Marine was the first to receive this new engine at the Seawork exhibition in Southampton, UK, in mid-June.

Mermaid sales executive Julian Osborne says production of these 74 LFEN-M engines will begin August 2023. This four-stroke engine has displacement of 7.4 litres and six in-line cylinders, common rail injection, turbocharger, air-to-water cooling, diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR).

“There will be a 4.9 litre in-line four-cylinder engine soon,” says Mr Osborne. “This will be going through prototype design and should be approved by the end of Q3 2023.” DNV has already certified the 74 LFEN-M engine for use on workboats, harbour and fishing vessels.

Marine and Hazardous (M&H) Engines has shipped the first marine engines that comply with California Air Resource Board (CARB) Tier 4+DPF strict emissions standards for workboats to the western US state for installation in Q3 2023.

These 9-litre, six-cylinder diesel engines can produce 317 kW at 2,200 rpm, with a torque of 1,376 Nm and peak torque speed of 1,600 rpm.

M&H managing director Barry McCooey says these engines produce 99.8% less carbon monoxide, 99.8% less NOx and 99.8% less particulate matter than EU Stage I engines.

“Our engines are approved to meet CARB standards and the first two are on their way to California,” he says. “Our engines have twin turbochargers, exhaust gas recycling and optimised aftertreatment that includes DOC, SCR and diesel particulate filters.”

This range with ultra-low emissions includes diesel engines with displacement of 4.5 litres and 6.8 litres. Mr McCooey says engines with 14 to 18 litres displacement are under development. M&H marine engines with 4.5-litres are rated at 130 kW at 2,200-2,400 rpm and 6.8-litres develops 170-224 kW at 2,400 rpm.

Cummins displayed its new generator set for vessels of more than 20 m using a 200-kW rated engine. This genset includes an Onan QSB7 diesel engine to produce electricity on board at 50-60 Hz and will be managed via a ComAp controller.

Hendy Power introduced the new Cursor 16 600 marine engine from FPT Industrial, which is designed for the commercial marine market to comply with IMO Tier III emissions regulations with an SCR.

Hyundai Seasall has developed two new common-rail diesel engines with IMO Tier III options for light-duty commercial workboats. The four-cylinder version achieves 149 kW and the V6 version develops 207 kW. There are stern-drive and shaft-drive gearbox options.