Rolls-Royce Marine has signed a contract to deliver highly efficient engines and propulsion systems for the world’s first Liquid Natural Gas (LNG) powered tugs.
Robert Løseth, Rolls-Royce, Senior VP – Merchant, Propulsion Systems and Engines said:
This is a breakthrough for our Bergen gas engines and cutting edge propulsion technology. The choice our customer has made highlights the industry leading engine performance, fuel consumption and low methane emissions that Rolls-Royce can offer, which is now being applied to tugs.
In addition to two gas engines and a single LNG tank, Rolls-Royce will deliver a mechanical direct driven azimuth propulsion system for each tug that will provide the quickest response time for manoeuvring; which is critically important for tug operators. The combined power and propulsion system will also enable the lowest possible fuel consumption in all operating modes. Rolls-Royce will also provide automation and control systems for the two escort vessels.
We wanted to base the design of the new tugs on the spark ignition lean burn engine concept, and the ability to accommodate direct drive in addition to a low emission profile. The propulsion system on high performance escort tugs needs to accommodate rapid load pick up over the entire load range. Due to the above we chose to work closely with Rolls-Royce on this project
The scope of supply for Rolls-Royce in this contract is:
2x US35 Aquamaster
2x Bergen C6 Ing engines, mechanical drive
RR Acon control and monitoring for gas system
1x AGA Cryo LNG tank with LNG system based on two coldboxes
The LNG system is designed by AGA Cryo and integrated with the Rolls-Royce propulsion system. This single tank LNG system has got full gas redundancy approved by NMD (Norwegian Maritime Directorate) i.e. no diesel back up is required.
Operational Benefits:
Cleaner engine room
Less waste oil and no “switch over” problems
Easier to service
Less maintenance required
The gas engines can operate on low load with out any restriction and have a very quick and step less ramp up time from 0 to 100% load.
Bunkering:
The fuel system is designed for weekly bunkering intervals and the bunkering time is estimated to be 45 minutes. Bunkering will be carried out by the ship’s crew.
Nox emissions are lower at low engines loads, which are the reverse trend of most diesel engines, making it the optimal solution for tugs which are spending most of the time at lower engine loads.
Environmental Benefits Of Spark Ignited Gas Engines:
92% reduced NOx emission
17% reduced GHG emission
98-100% reduced SOx emission
98% reduced particulates
No oil spill during bunkering
No oil spill in ship engine room bilges
No sludge from purifiers
No FO waste-/leak oil
No FO oil spill, reduced Fire Risk
Long-term compliance with local port regulations and potential benefits from taxation/green port dues
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March 19, 2024
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