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DESMI Ocean Guard Optimised Ballast Water Treatment Systems

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

The company’s systems feature low-power consumption and reliable performance in challenging water conditions, with one of the smallest operational footprints in the ship industry.

Optimised ballast water treatment system

DESMI Ocean Guard systems can be easily installed without the need to relocate other equipment. The system combines small footprint with large flow rates, with only 3m2 required for a system with a 1,000m3/h, or 4,403 US gallons per minute (gpm) capacity, in addition to 0.84m2 for the electrical panel, which can be placed up to 100m away from the system.

Based on mechanical treatment, the fully automated CompactClean system eliminates the risk of hazards to the crew, vessel or the environment caused by chemicals or active substances. The first step of this process involves filtration, followed by ultraviolet (UV) treatment. For de-ballasting, the UV treatment is repeated but filtration is skipped.

The ballast water treatment system has no salinity or temperature limitations and features International Maritime Organization (IMO) and US Coast Guard (USCG) type approvals.

UV treatment for ballast water

The innovative patent-pending shape of the UV chamber provides optimal performance. It has been developed using advanced computational fluid dynamics (CFD) simulations. UV units are made of nickel-aluminium-bronze material with high seawater corrosion-resistance to provide a long lifetime.

CompactClean automatically adjusts treatment in challenging water conditions to avoid triggering alarms or interrupting port operations. This allows the vessel to continue port operations instead of making the vessel interrupt ballast water discharge processes, saving costs caused by delays.

Integrated solution for ballast stripping operations

The system’s filter backflush pump can be used as a stripping pump for ballast tanks. This can be used as an alternative to ejectors, which can affect compliance with IMO and USCG discharge standards as untreated water is mixed with the treated ballast water.

Automated ballast water management with reporting

CompactClean uses a programmable logic controller (PLC) and supports most standard communication interfaces.

As a fully automatic system, CompactClean can be easily integrated with existing systems to provide efficient operation. It is easy-to-use, with one button for starting ballast operations and one for discharging ballast water available on the graphic touchscreen interface.

CompactClean can automatically create PDF reports for authorities and to document treatments, including key monitored parameters. Files are stored in the system and can be transferred to a USB memory stick through the electrical panel.

This function helps vessel owners meet increasing demands from authorities for documentation required by IMO conventions and USCG and Environmental Protection Agency (EPA) regulations.

UV water treatment for ships

DESMI’s CompactClean has a unique patent-pending shape that ensures a high dose of UV is applied in ballast water treatment.

This ensures that water is processed in accordance with IMO and USCG standards in adverse conditions with low UV transmission.

The CompactClean system is available in various sizes with a maximum flow rate ranging from 135m3/h (595gpm) to 3,000m3/h (13,208gpm).

IMO and USCG type-approved ballast water management system

CompactClean has IMO type approval according to the revised ballast water management system code and Lloyd’s Register standards. The system also has full compliance with USCG standards, meaning that it is approved for worldwide use.

The system has no minimum holding time limitation in IMO territory, and just 2 hours minimum holding time limitation in US Territory.

Accessible control panel for ballast water unit

The system is supplied with a main control panel that can be placed within easy access. It features a human-machine interface (HMI) that is used to control the system and visualise alarms.

Operations can be controlled from a secondary screen in the deck control office or on the bridge if an optional remote screen is selected.

The range of standard fully automated treatment modes includes ballast, de-ballast, stripping, water filling and recirculation operations.

Operators can switch between screen views to display the relevant information and monitor component status during operation. Values such as temperature, pressure, flow, and UV intensity are displayed in real-time, along with trend curves to display development over time.

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Press Release

Ballast water management systems with fast delivery

DESMI Ocean Guard offers a selection of skid-mounted ballast water management systems and loose components within four working weeks.

White Papers

Ballast Water Management: a Comparison Between UV Based and Electrochlorination Systems

This white paper provides an overview of the two most prominent ballast water management (BWMS) technologies installed on today’s vessels-ultraviolet (UV)-based systems and electrochlorination (EC) systems.

DESMI Ocean Guard Images

Products and Services


Press Release

21 February 2020

DESMI Ocean Guard offers a selection of skid-mounted ballast water management systems and loose components within four working weeks.

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6 January 2020

Fayard shipyard in Denmark has signed a frame agreement to retrofit CompactClean Ballast Water Management Systems on its entire fleet with the Seychelles Petroleum Company Limited (SEYPEC) and German Tanker Shipping.

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8 July 2019

Stolt Tankers has selected DESMI OceanGuard's CompactClean Ballast Water Management System (BWMS) to be installed on its existing fleet.

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3 July 2019

DESMI Ocean Guard has been awarded a US Coast Guard (USCG) approval certificate for its CompactClean Ballast Water Management System (BWMS).

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7 May 2019

Sea Tankers has selected DESMI Ocean Guard's CompactClean Ballast Water Management System (BWMS) for installation on its existing fleet of vessels, and appointed DESMI Ocean Guard to undertake all the required engineering for the retrofit installations.

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17 April 2019

ODESMI Ocean Guard’s CompactClean Ballast Water Management System (BWMS) has received US Coast Guard (USCG) Type Approval.

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9 April 2019

The annual report for the DESMI group was approved at its annual general meeting.

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2 April 2019

DESMI Ocean Guard has announced that DFDS has selected the CompactClean ballast water management system (BWMS) for installation on its existing fleet of vessels.

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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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