Berg Propulsion supplies EEXI performance control for Danish shipping company Uni-Tankers

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Uni-Tankers has confirmed that the installation of a new Berg Propulsion control system has been key to achieving a remarkable 15-17% efficiency gain on board two existing vessels, as part of a modernization which significantly reduced fuel consumption and emissions.

Efficiency gains reflect the installation of Berg’s MPC800 control systems and an upgrade of the main engines on board the chemical tankers Anhout Swan and Lessow Swan to operate in variable speed mode.

International Maritime Organization targets call for a 40% reduction in greenhouse gases from ships by 2030. Next year owners will face a new IMO regime on ship efficiency , requiring them to adhere to an Energy Efficiency Index for Existing Vessels (EEXI) and provide their Carbon Intensity Indicator (CII). Each vessel’s EEXI rating is generated with reference to an Energy Efficiency Design Index (EEDI) benchmark.

While ships built today may be designed for optimum fuel efficiency at lower speeds, those delivered 7 to 15 years ago were optimized for higher engine loads. With fuel prices at unprecedented levels, suboptimal performance of propulsion systems operating at “part load” is a cost inefficiency that can hurt competitiveness. The ability to control power more efficiently using variable speeds reduces overall power consumption, reducing both fuel consumption and emissions.

Danish shipping company Uni-Tankers has consulted Berg Propulsion and Zeppelin on its options for improving the efficiency of the Anhout Swan and Lessow Swan tankers built in 2008 and operating at 14 knots. Berg’s simulations demonstrated that, in combination, the precise control available to the MPC800 system and a modification of the ships four-stroke MaK 8M32C main engines would provide significant efficiency gains for the propellers and variable-pitch thrusters (CP ).

“This is a great example of how ships already in service can be optimized to anticipate the transition to the EEXI and CII regimes,” says Jonas Nyberg, Managing Director West of Berg Propulsion. “The goal is to stay one step ahead and help our customers move towards greener operations with lower CO2 emissions by offering solutions that also improve competitiveness.”

Installing the MPC800 control system upgrade is one of many class-approved options designed by Berg Propulsion to help vessels meet efficiency challenges. Working closely with owners and operators, Berg analyzes a vessel’s current and future operational needs, assesses its EEXI rating, and uses 3D scanning and modeling tools to develop modernization options that deliver efficiencies. based on cost, also taking into account any dry docking work required.

“The goal is to bring efficiency gains where they are most needed,” says Magnus Thorén, Team Leader Energy and Efficiency, Berg Propulsion. “Variable speed control allows the owner to achieve significant efficiency improvements by providing greater engine responsiveness to changing loads.”

“Our way of measuring the success of a project is how well our total integrated main propulsion solutions will benefit our customers,” says Mattias Hansson, Global Account Manager, Berg Propulsion. “We are delighted with the very good and open cooperation with Uni-Tankers and with our dealer Erik Hass in Zeppelin Denmark to enable these efficiency upgrades to maximize the performance gains of the vessel and reduce the total cost of possession.”

Other Berg modernization options include optimizing the propeller blades (including replacement), installing a net frequency stabilizer so that the shaft generator can run at variable speed, and upgrading level of the control system software to activate the “Dynamic Drive” cruise control, explains Thorén. The Dynamic Drive is a software package installed in the Berg control system to optimize propeller pitch and RPM for a given condition.
Source: Berg Propulsion

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