RayCleanTM Ballast Water Management System
The RayCleanTM ballast water management system is type approved by IMO and DNV-GL and can treat ballast water at any flowrate from 30 – 3000 m3/h. The system is based purely on mechanical treatment and therefore it does not involve any use of chemicals or active substances. First treatment step is filtration, second step is UV treatment.
The system can be delivered in special EX-version suited for installation in hazardous areas.
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RayCleanTM has no salinity or temperature limitations and has been proven effective in water with UV-T (UV-Transmission) as low as 0.33, which sets the industry benchmark! Learn more about UV-Transmission by watching our UV-T movie or download our UV-T leaflet.
The UV treatment takes place in units with a flow capacity of 300 m3/h. Each UV unit is equipped with 60 highly efficient low-pressure UV lamps. These lamps are roughly twice as energy efficient as the widely used medium pressure UV lamps, and as they work at much lower temperature they have superior lifetime.
Constant online monitoring of the UV intensity inside each unit is used to dim the UV lamps in very clear water (high UV-Transmission) in order to save energy, and to reduce the flow through the unit in extremely unclear water (low UV-Transmission). This ensures a carefully dosed UV treatment at all times resulting in discharge compliance even in extremely challenging water conditions. All lamp dimming and flow control is fully automatic.
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|Features ||Remarks |
|1. Treatment consisting of mechanical filtration and UV treatment. ||Well proven treatment combination that has been used for decades in many different water treatment applications. |
|2. Full treatment during both ballast water uptake and ballast water discharge. ||Use of the filter also during de-ballast ensures optimum protection of the components inside the UV unit. |
|3. Operation of system is fully automatic and only requires “start operation” and “stop operation” input from the crew. This input is given by simply pushing a button on the control touch screen. ||Use of the RayCleanTM BWMS does not impact the daily routines and procedures onboard the vessel. |
|4. System is equipped with 15” touch screen which clearly displays the main components of the system, the actual operation parameters (flow rate, UV intensity, differential pressure over filter, valve positions) and any alarms or errors. ||This ensures easy operation and clear indication of the exact location or UV-lamp in case of problems. |
|5. System is tested and approved for treatment of ballast water with all salinities. From fresh water, to brackish water, to marine water. ||This allows for compliant operation everywhere in the world. |
|6. System is tested and approved for treatment of ballast water with very low UV-T, as low as 33% ||This allows for compliant operation everywhere in the world. |
|7. System is approved for operation in all normal water temperatures, from sub-zero (as long as the water stays liquid) to 40+ deg. C. ||This allows for compliant operation everywhere in the world. |
|8. Mechanical filter includes automatic backflushing. ||Cleaning is automatic and does not require any action by crew. |
|9. UV treatment based on highly efficient low pressure UV lamps ||The RayCleanTM UV lamps play an important role in the low power consumption and excellent treatment performance demonstrated by the system. |
|10. UV lamps have a lifetime of approx. 12000 hrs. ||Replacement of UV lamps only takes place one to three times during the lifetime of a typical ship. |
|11. UV unit includes dimming functionality to reduce power consumption when the treated water is clear. ||Ensures lowest possible power consumption at all times. |
|12. UV unit includes automatic cleaning of UV quartz tubes after and before each ballast operation. The cleaning is done by sliding Teflon scraper rings along the quartz tubes. The cleaning operation is fully automatic and without involvement from crew. ||Removes problems with fouling or staining of quartz tubes due to deposits on the tubes between ballast operations. |
|13. Very short start-up time, less than 2 minutes. || |
This ensures minimum interference with the normal ballast operations onboard the vessel.
|Capacity [m3/h] ||System Power |
Consumption* Max. [kW]
|System Power |
Consumption* Min. [kW]
|Weight [kg] ||Foot Print** [m2] |
|100 ||21 ||11 ||1425 ||5 |
|200 ||21 ||11 ||1425 ||5 |
|300 ||21 ||11 ||1675 ||5 |
|400 ||42 ||22 ||2525 ||6 |
|500 ||42 ||22 ||2975 ||6 |
|600 ||42 ||22 ||2975 ||6 |
|700 ||63 ||33 ||3825 ||8,5 |
|800 ||63 ||33 ||4075 ||8,5 |
|900 ||63 ||33 ||4075 ||8,5 |
|1000 ||84 ||44 ||4925 ||10,5 |
|1100 ||84 ||44 ||4925 ||10,5 |
|1200 ||84 ||44 ||5375 ||10,5 |
|1300 ||105 ||55 ||6175 ||11,5 |
|1400 ||105 ||55 ||6175 ||11,5 |
|1500 ||105 ||55 ||6175 ||11,5 |
|1600 ||126 ||66 ||7525 ||12,5 |
|1700 ||126 ||66 ||7525 ||12,5 |
|1800 ||126 ||66 ||7525 ||12,5 |
|1900 ||147 ||77 ||8325 ||14,5 |
|2000 ||147 ||77 ||8875 ||14,5 |
|2100 ||147 ||77 ||8325 ||14,5 |
|2200 ||168 ||88 ||9725 ||16 |
|2300 ||168 ||88 ||9725 ||16 |
|2400 ||168 ||88 ||9725 ||16 |
|2500 ||189 ||99 ||11075 ||17,5 |
|2600 ||189 ||99 ||11075 ||17,5 |
|2700 ||189 ||99 ||11075 ||17,5 |
|2800 ||210 ||110 ||11975 ||19 |
|2900 ||210 ||110 ||11975 ||19 |
|3000 ||210 ||110 ||11975 ||19 |
* Power consumption excludes optional filter backflush pump
** Footprint including electrical panels
Treatment System Pressure/Pressure Loss
Required inlet pressure of the treatment system: Minimum 2 bar / maximum 9 bar
Total pressure loss of the treatment system: 0.5 bar
3 x 230V, 50/60Hz – 10A for main control panel and 3 x 63A per UV control panel
As one of the very few ballast water treatment systems on the market, the RayCleanTM system utilizes highly efficient low-pressure UV lamps, as opposed to the more commonly used medium pressure UV lamps. The low pressure UV lamps have a number of distinct advantages:
| ||RayCleanTM low pressure UV lamp ||Medium pressure UV lamp |
|Energy-efficiency || |
Converts approx. 35% of input power to useful UVC light.
Only half the electrical power is required to generate the same UV treatment
|Converts approx. 20% of input power to useful UVC light. |
|Lamp lifetime ||12,000 hrs. ||3,000 – 64,000 hrs. |
|Operating temperature || |
150 deg. C.
The low temperature is not a problem if the UV lamps are not fully submerged in water at all times. This is a requirement for medium pressure lamps.
|800 – 1,000 deg. C. |
|Start-up time || |
Less than 2 mins.
The short start-up time means there is minimum interference with the normal ballast operations on a vessel.
|2-5 mins. |
|Mercury content || |
Extremely small amount contained in amalgam in solid form.
It is safe and not a problem to break a UV lamp. Broken glass and amalgam can simply be collected and removed without any special precautions or equipment.
Larger amount contained in liquid form.
If a medium pressure lamp is broken, special cleaning kit must be used to collect and dispose the mercury.
In the design and development of the RayCleanTM system safety has been a top priority. This means safety for the crew, the vessel and the environment:
- Crew safety: The system is purely mechanical which means no chemicals must be handled by the crew, not even for cleaning. Safety features ensure automatic system shutdown in case of no water flow, overheating or too high pressure. If a UV lamp breaks during replacement there is no liquid mercury inside the UV lamp and therefore no health risk for the crew.
- Ship safety: The system generates no by-products or explosive substances during operation. The chemical composition of the water is not altered during treatment, which means there is no risk of increased corrosion.
- Environmental safety: No chemicals and/or neutralizing chemicals are used and therefore there is no risk of discharging chemicals and its by-products to the environment. The power consumption of the RayCleanTM system is the lowest in class which helps to keep engine emissions (CO2, NOX, SOX) at a minimum.
RayCleanTM is fully automated and based on a PLC platform, which controls the valves, pumps, UV sensor, flow meters, pressure- and temperature sensors. RayCleanTM consists of two types of control panels: a Master Control Panel and a number of UV Control Panels, one for each UV unit.
RayCleanTM is controlled by the PLC located in the Master Control Panel. The UV Control Panels are connected to the Master Control Panel via a Profinet Ring bus. The Master Control Panel has a 15” colour graphic touch screen (also called HMI). This is used for local control of the system, but as an option one or more remote HMI’s can be offered and integrated into the solution. Alternatively the RayCleanTM automation can be integrated into the existing vessel automation system.
The operation of the system is made as simple as possible. The operator only has to start and stop the ballast and de-ballast operation and the remaining part of the operation is then fully automatic. RayCleanTM is automatically optimizing the power consumption via dimming of the UV lamps and regulation of the flow in accordance with the characteristics of the water. During ballast and de-ballast operations the control system is logging the operation data and time-stamp the date before it is saved into a log file.
What is UV-Transmission?
UV-T is a measure of the capability of UV light to penetrate into the water. When the UV-T is high, close to 100%, the water is very clear and the UV light can penetrate deep into the water. On the other hand, when the UV-T is low (below 50%) the water is very un-clear and the UV light can only penetrate a limited distance into the water.
In the figure below two cases with different UV-T are illustrated; one case with high UV-T of 90%, and one case with just 50% UV-T.
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In the graphs it is illustrated how rapidly the UV intensity decays away from the UV-lamp.
With a UV-T of 90% the UV intensity is 81% 2 cm away from the UV lamp, whereas it has dropped to a UV intensity of just 25% 2 cm away from the lamp when the UV-T level is 50%.
UV-Transmission of ballast water
The UV-T found in different ports around the world varies significantly. Some ports are located at river estuaries which means the water in the port is fresh water containing high amounts of sediments, organic particles and dissolved organic compounds. This makes the UV-T very low. Other ports are located on islands in the middle of an ocean, and here the UV-T is typically high.
|Port ||UV-T |
|Skagen, Denmark ||92% |
|Tanjung Pelepas, Malaysia ||83% |
|Brisbane, Australia ||92% |
|Melbourne, Australia ||87% |
|Lisboni*, Portugal ||41% |
|Zeebrugge, Belgium ||85% |
|Bremerhaven, Germany ||60% |
|Porto Grande, Cape Verde ||92% |
|Brunswick, GA, USA ||51% |
|Wallhamn, Sweden ||91% |
|Shanghai, China ||49% |
|Vera Cruz, Mexico ||94% |
|Houston, USA ||74% |
|New Orleans, USA ||54% |
|Shanghai, China ||55% |
|Hong Kong, China ||80% |
|Antwerp, Belgium ||66% |
|Rotterdam, Netherlands ||93% |
|Lisbon, Portugal ||53% |
|Yangzte river, Taizhou ||37% |
*Minimum observed level which lasted just a few minutes
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UV-Transmission limit of DESMI Ballast Water Treatment Systems
Only a few systems can cope with UV-T level below 50%. The DESMI systems can and sets the industry benchmark regarding UV-T limitation. The RayCleanTM system holds the absolute record with a UV-T limit at just 33%.
This remarkable performance is a result of the UV unit design and the unique capability of reducing the flow in extreme cases. The RayCleanTM system constantly monitors the UV intensity inside the UV unit, and if it is lower than a certain threshold, the flow through the unit is automatically reduced. This ensures compliance with discharge standards at all times, and even in extreme cases where no other system on the market can treat the water. In reality this flow reduction is only rarely utilized. The table show how the flow through one 300 m3/h RayCleanTM UV unit is reduced at different UV-T levels.
|Port ||UV-T ||RayClean flow, per UV unit |
|Skagen, Denmark ||92% ||300 |
|Tanjung Pelepas, Malaysia ||83% ||300 |
|Brisbane, Australia ||92% ||300 |
|Melbourne, Australia ||87% ||300 |
|Lisboni, Portugal ||41% ||200 |
|Zeebrugge, Belgium ||85% ||300 |
|Bremerhaven, Germany ||60% ||300 |
|Porto Grande, Cape Verde ||92% ||300 |
|Brunswick, GA, USA ||51% ||270 |
|Wallhamn, Sweden ||91% ||300 |
|Shanghai, China ||49% ||250 |
|Vera Cruz, Mexico ||94% ||300 |
|Houston, USA ||74% ||300 |
|New Orleans, USA ||54% ||300 |
|Shanghai, China ||55% ||300 |
|Hong Kong, China ||80% ||300 |
|Antwerp, Belgium ||66% ||300 |
|Rotterdam, Netherlands ||93% ||300 |
|Lisbon, Portugal ||53% ||295 |
|Yangzte river, Taizhou ||37% ||140 || || |