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DESMI Ocean Guard Ballast Water Treatment Systems

DESMI Ocean Guard develops ballast water treatment systems for the marine industry.

The company’s systems have set industry benchmarks for low-power consumption and reliable performance in challenging water conditions.

Optimised ballast water treatment system

Rayclean is a type-approved ballast water system, which uses mechanical filtration and UV radiation.

Mechanical filtration is performed using an automatic back-flushing filter developed especially for Boll & Kirch ballast water. It employs a screen filter with a 30-micron wire mesh.

UV treatment takes place in a specially designed and optimised UV reactor that has a treatment rated capacity (TRC) of 300m³/h. System flow rates up to 3,000m³/h are obtained by installing more UV reactors in parallel.

The RayClean system uses highly effective, low-pressure UV lamps that reduce the system energy consumption between 30% and 50% compared with mid-pressure lamps.

Fully automated treatment for ballast water

Crew members only need to start and stop ballast operations, with the rest of the RayClean system’s operation being fully automated.

The RayClean system copes with extremely challenging water conditions by automatically reducing water flow through the system.

While other UV systems have to give a low UV transmission warning, the RayClean system can continue treatment in compliance with discharge standards by reducing the flow rate.

Reliable ballast water treatment systems

System development and testing have provided a reliable solution that will work with any level of water salinity or temperature.

DESMI Ocean Guard has also tested its systems in freshwater conditions, and at extremely low UV-transmission.

This provides solid evidence that when other ballast water treatment systems reach their limit cold water or low UV-transmission, DESMI Ocean Guard systems remain functional.

System component delivery for vessels

DESMI Ocean Guard delivers ballast water treatment systems as individual loose components to facilitate integration for retrofit projects or larger systems.

Systems can also be delivered skid-mounted, the best option for small / mid-sized systems and new vessels.

Alternatively, systems can be provided in a container, requiring only a connection to a power supply, and a ballast water inlet and outlet.

Ship inspection and engineering services

DESMI Ocean Guard’s talented engineers can inspect vessels to provide feedback on the best possible location for retrofit ballast water treatment systems.

The company can use 3D scanning to prepare a 3D CAD model, which will give an accurate indication of how the system will look when installed aboard vessels.

This ship inspection service will allow clients to plan ahead and avoid possible collisions with equipment such as ladders, piping and stiffeners.

Installation, commissioning and servicing of ballast water systems

DESMI systems are installed and commissioned by one of the companies’ supervisors, alongside a crew of experienced workmen, and DESMI collaboration partners.

The company offers a complete service agreement for its systems, including regular inspections and maintenance work.

About DESMI Ocean Guard

In 2009, ship owner AP Moller-Maersk, pump manufacturer DESMI, and water treatment specialists UltraAqua established DESMI Ocean Guard.

By combining the knowledge of these three companies, it has been possible to develop ballast water treatment systems that meet International Maritime Organisation (IMO) discharge standards.

The systems also take into consideration the special concerns and issues related to installation and daily operation on-board vessels.

DESMI Ocean Guard is now owned by DESMI A/S.

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Press Release

DESMI Ocean Guard’s BWMS Receives IMO Type Approval

DESMI Ocean Guard has announced that the CompactClean Ballast Water Management System (BWMS) has received IMO Type Approval according to the revised IMO BWMS code.

White Papers

DESMI Ocean Guard RayClean

RayClean is the leading ballast water treatment system in the marine industry, with unrivalled treatment performance and the lowest energy consumption in its class.

DESMI Ocean Guard Images

Products and Services


Press Release

24 September 2018

DESMI Ocean Guard has announced that the CompactClean Ballast Water Management System (BWMS) has received IMO Type Approval according to the revised IMO BWMS code.

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27 August 2018

DESMI Ocean Guard will be presenting its range of water treatment solutions at SMM 2018.

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17 April 2018

DESMI Ocean Guard is pleased to announce that all the required land-based testing of the CompactClean Ballast Water Management System has been successfully completed.

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9 April 2018

The DESMI group 2017 annual report has been delivered and approved at the annual general meeting.

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18 January 2018

DESMI Ocean Guard A/S will be supplying MISHA Shipping's entire fleet with COmpactClean Ballast Water Management Systems (BWMS) under a new contract.

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15 November 2017

DESMI Ocean Guard will be exhibiting MarinTech 2017, which will be taking place at the Shanghai New International Expo Centre in China between 5 and 8 December.

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3 November 2017

Our team will be exhibiting in Rotterdam from November 7-10 and if you are curious about the latest developments and technologies in the marine market you should drop by the DESMI stand no. 4206. 

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14 September 2017

DESMI Ocean Guard is proud to announce the launch of its new CompactClean ballast water management system, which sets new standards for small footprint, reliable performance, and certainty of meeting both the international and US discharge standards.

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13 July 2016

On July 12th the US Coast Guard denied DESMI Ocean Guard's appeal regarding USCG's initial decision to reject the use of the MPN test method in type approval testing of ballast water treatment systems.

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16 June 2016

DESMI Ocean Guard A/S announced that notified body DEKRA EXAM GmbH on 9 June 2016 issued ATEX certificate for its RayClean-EXTM ballast water treatment system. This means the system can now be installed directly in hazardous areas onboard tanker vessels.

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26 January 2016

DESMI Ocean Guard A/S is to appeal the US Coast Guard's decision to reject the Most Probable Number (MPN) method for type-approval testing of ballast water treatment systems (BWTS).

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14 January 2016

On 16 December 2015, japanese classification society Class-NK issued a type approval certificate for the DESMI Ocean Guard RayCleanTM ballast water treatment system.

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9 November 2015

DESMI Ocean Guard is pleased to announce that the RayCleanTM BWTS has been selected for installation on a series of new container vessels for Maersk Line.

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6 November 2015

At the upcoming Ballast Water Management Technology (BWMTech) conference in London, DESMI Ocean Guard CEO Rasmus Folsø will be sharing experiences obtained with the US Coast Guard type-approval process of ballast water treatment systems.

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11 February 2015

DESMI Ocean Guard are pleased to announce that the RayClean™ BWTS was granted AMS acceptance by the USCG on 30 January.

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8 January 2015

In late December 2014, DESMI Ocean Guard received orders for the RayClean-400 ballast water treatment system for two new asphalt carriers being built at 3. Maj shipyard in Croatia.

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6 October 2014

DESMI Ocean Guard will be participating in the Danish Maritime Fair exhibition from 7-10 October. The exhibition takes place in the Bella Center in Copenhagen, Denmark, where DESMI Ocean Guard will display the RayClean system at stand no. B0-025.

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8 September 2014

The ground-breaking new ballast water treatment system RayClean, developed by DESMI Ocean Guard, has received IMO and DNV type approval.

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3 July 2014

The partners of DESMI Ocean Guard today announced that A.P. Moller-Maersk and UltraAqua have sold their shares in DESMI Ocean Guard to DESMI.

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18 June 2014

DESMI Ocean Guard is pleased to announce that Nippon Kaiji Kyokai, the Japanese classification society Class-NK, has type approved our OxyClean™ ballast water treatment system.

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30 May 2014

On 2-6 July, DESMI Ocean Guard will appear at the POSIDONIA 2014 exhibition. We look forward to meeting with our current and future clients, suppliers and anyone else who is interested in ballast water treatment.

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1 April 2014

On 9-11 April, DESMI Ocean Guard participates in the SEA-Japan 2014 exhibition in Tokyo. We look forward to meeting with our current and future clients, suppliers and anyone else who is interested in ballast water treatment. Please visit us in booth 2H-53, where we will display our products, including a RayClean UV-unit, capable of treating 300m³/h of ballast water.

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