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Rolls-Royce To Deliver World’s First 100% LNG-Powered Tugboat

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By gCaptain Staff On January 12, 2012

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.

The two vessels have been ordered by Norwegian company Buksér og Berging AS and will enter service in late 2013 for Statoil, the international energy company, and Gassco, the operator of the gas transportation network off the Norwegian coast.

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.

LNG powered ship azimuth drive rolls royce
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.

Commercial Director at Buksér og Berging AS, Vetle Sverdrup said:

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
  • Compliant with Tier III regulations

The vessels are designed by Buksér og Berging AS together with Marin Design AS in Kolvareid, Norway. The project was developed in close contact with Rolls-Royce giving Rolls-Royce a unique opportunity to understand and adhere to operational requirements. The vessels have the following specifications:

  • Loa:    35.00m
  • Lpp:    30,54m
  • Bm:     15.40m
  • Draft:   7.50m
  • Accommodation for 7 persons

Related Articles:

  1. Rolls-Royce wins contract to power fuel efficient ferries
  2. PaxOcean orders two Rolls-Royce designed offshore vessels
  3. Rolls-Royce to power ten Littoral Combat Ships for the U.S Navy
  4. Carnival Cruise Lines awarded $24M in lawsuit against Rolls Royce
  5. Rolls-Royce and Bestway unveil new energy efficient ship designs

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USA: Wartsila Wins LNG Propulsion Equipment Contract for Offshore Vessels

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Wärtsilä has been awarded a contract in October 2011 to supply liquefied natural gas (LNG) propulsion equipment for two advanced offshore supply vessels owned by Harvey Gulf International Marine. These supply vessels will be the first ever U.S. flagged platform supply vessels (PSV) to be powered by clean, safe and efficient LNG. The contract includes options for supplying propulsion equipment for additional follow-on vessels.

Wärtsilä will deliver an integrated system that includes the dual-fuel machinery, electrical and automation package, complete propulsion, and also the LNG fuel storage and handling components. The STX Marine Inc SV310DF Offshore Support Vessels will be powered by Wärtsilä 6-cylinder 34DF dual-fuel engines. The LNG storage capacity of 290 cubic meters (m3), enables more than a week of vessel operational time. In addition, the vessels will carry 5520 tons of deadweight at load line and have a transit speed of 13 knots. The vessels are scheduled for delivery in two years and will operate in the Gulf of Mexico.

Mr Shane Guidry, Harvey Gulf International Marine’s Chairman and CEO, states that the stringent governmental demands for reduced emissions, together with predictions that availability of ultra low sulphur diesel fuel will be restricted, caused the company to consider the use of gas as fuel. “We’re committed to bringing the world’s best technologies to our customers, and these vessels with Wärtsilä’s integrated system based on the use of LNG further demonstrates Harvey Gulf’s Going Green Vision,” he says.

Pete Jacobs, Business Development Manager, Offshore at Wärtsilä North America adds:, “It’s a pleasure to work with a company such as Harvey Gulf whose management is dedicated to introducing advanced, clean, natural gas supply vessels. These modern supply vessels showcase Wärtsilä’s leading position as a complete solutions provider of LNG propulsion with electric drive systems.”

“We are witnessing a transformation of the marine industry as it charts a course towards a new era for natural gas. It’s exciting for Wärtsilä to be a trusted partner in this launch with industry leader Harvey Gulf, whose natural gas supply vessel investment actions of today signal a coming paradigm shift. This is aimed at capturing operational savings while simultaneously reducing emissions,” says John Hatley, Vice President Ship Power, Wärtsilä North America.

Dual-fuel technology meets economic and environmental targets

Wärtsilä has been at the forefront in the development of highly efficient dual-fuel engine technology, allowing the same Wärtsilä 34DF engine to be operated on either gas or diesel fuel with full EPA emissions Tier 2compliance. This dual-fuel capability means that when running in gas mode, the environmental impact is minimized since nitrogen oxides (NOx) are reduced by some 85 per cent  compared to diesel operation, sulphur oxide (SOx) emissions are completely eliminated as gas contains no sulphur, and emissions of CO2 are also lowered. Natural gas has no residuals, and thus the production of particulates is practically non-existent.

The shipping industry finds the operational savings that gas offers to be very compelling. Similarly, the significant environmental benefits that LNG fuel provides are of increasing importance. With fossil fuel prices, and especially the cost of low sulphur marine fuel, likely to continue to escalate, gas is an obvious economic alternative.

Drawing from decades of experience in the development and application of natural gas engines for both the power generation and marine industries, Wärtsilä is the global leader in this advanced technology. Wärtsilä recently passed the 3 million running hours milestone with its dual-fuel engine technology.

Original Article

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