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allast Water Treatment System PRU
DAWONSYS Co., Ltd. (South Korea)
Refurbished
The Ballast Water Treatment System (BWTS) has become one of the most critical environmental compliance systems onboard modern vessels. Following the implementation of international ballast water regulations, ships are required to treat ballast water before discharge to prevent the transfer of invasive aquatic species between different marine ecosystems.
The equipment shown in the images is identified as a Power Rectifier Unit (PRU), a major electrical component within a Ballast Water Treatment System. Based on the equipment nameplate markings, the unit is designated as PRU-1 and is installed onboard the vessel LADY CEDROS. The enclosure contains power electronics, control boards, protection circuits, rectifier modules, fuses, and monitoring components designed to support ballast water treatment operations.
In electrochlorination-based ballast water treatment systems, the PRU converts incoming AC electrical power into controlled DC power required for the generation of sodium hypochlorite used during ballast water disinfection. In UV-based systems, similar power units may supply and regulate power to UV treatment equipment and associated control systems.
For ship operators, reliable operation of the PRU is essential because failure of this unit can result in ballast water treatment system shutdown, environmental compliance issues, vessel delays, and expensive emergency repairs.
SM MARINE SERVICE™ supplies, repairs, troubleshoots, and sources Ballast Water Treatment System equipment, including Power Rectifier Units, control modules, power supply assemblies, PLC systems, monitoring units, and associated spare parts.
A Power Rectifier Unit (PRU) is a dedicated electrical power conversion system installed within the Ballast Water Treatment System architecture. The primary function of the PRU is to convert AC shipboard power into stable DC output required by treatment equipment.
The examined unit features:
The unit is designed for continuous operation in harsh marine environments where vibration, temperature fluctuations, humidity, and electrical disturbances are common.
Modern ballast water treatment systems interface with other shipboard systems including:
SM MARINE SERVICE™ supports both new and reconditioned BWTS components for vessel operators worldwide.
The primary role of the PRU is efficient conversion of vessel AC power into regulated DC output required for ballast water treatment processes. Stable DC power ensures reliable operation of treatment cells and associated equipment.
The enclosure is specifically designed for marine applications. Corrosion-resistant construction, protected electronics, and heavy-duty terminals allow operation in demanding engine room and technical spaces.
Multiple protection circuits help prevent damage caused by overvoltage, overcurrent, short circuits, phase imbalance, and electrical faults. These protection systems improve equipment reliability and operational safety.
Status indicators such as Power, Run, and Fail enable engineers to quickly identify operating conditions and troubleshoot abnormalities during vessel operation.
The unit carries classification approval markings, indicating suitability for marine installation and operation according to recognized maritime standards.
Industrial-grade electronic components and robust electrical design provide extended service life and dependable operation under continuous marine duty cycles.
The PRU can communicate and operate with various ballast water treatment controllers, monitoring systems, automation platforms, and environmental compliance systems installed onboard vessels.
| Parameter | Description |
|---|---|
| Product Type | Power Rectifier Unit (PRU) |
| Application | Ballast Water Treatment System |
| Function | AC to DC Power Conversion |
| Installation | Marine Ballast Water System |
| Enclosure Type | Industrial Marine Enclosure |
| Status Indicators | Power, Run, Fail |
| Protection Features | Fuse Protection, Electronic Monitoring |
| Output Type | Regulated DC Output |
| Classification | KR Class Marking Observed |
| Environment | Marine Engine Room / Technical Space |
| Vessel Application | Commercial Marine Vessels |
| Serviceability | Repairable and Maintainable |
| Spare Parts Availability | Available Through Marine Suppliers |
Note: Exact electrical ratings may vary depending on manufacturer configuration and vessel installation.
The Power Rectifier Unit is widely used in ballast water treatment installations across numerous vessel types.
Container vessels require ballast water management during loading and unloading operations. Reliable PRU performance ensures uninterrupted ballast treatment and regulatory compliance.
Bulk carriers frequently adjust ballast conditions depending on cargo loading patterns. BWTS systems rely on stable power conversion provided by PRU equipment.
Tankers operate globally under strict environmental regulations. The PRU plays a critical role in supporting ballast water treatment processes.
Chemical carriers require dependable environmental protection systems to comply with international maritime regulations.
LNG vessels depend on highly reliable automation and environmental systems where PRU functionality is essential.
PRU systems support ballast water treatment operations throughout worldwide trading routes.
Offshore support vessels often conduct frequent ballast operations, making reliable BWTS equipment especially important.
Cruise and passenger vessels require continuous compliance with environmental regulations during international operations.
Scientific vessels depend on effective ballast water management to prevent ecological contamination between regions.
Large fishing vessels and fish processing ships increasingly adopt ballast water treatment systems to meet international standards.
SM MARINE SERVICE™ can assist vessel owners, managers, operators, shipyards, and marine service companies with sourcing of:
We can source both New Equipment and Reconditioned Equipment depending on customer requirements, budget, and delivery schedules.
SM MARINE SERVICE™ provides technical support for Ballast Water Treatment Systems and associated marine automation equipment.
Our services include:
Our engineers and technical partners support a wide range of marine systems including Ballast Water Treatment Systems, Radar, ECDIS, AIS, Gyro Compass, Autopilot, VDR, BNWAS, GPS, Satellite Compass, Navtex, Inmarsat, GMDSS, Fire Alarm Systems, Boiler Control Systems, and Engine Monitoring Systems.
SM MARINE SERVICE™
Bangladesh Office
Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh
China Warehouse and Support Center
Shanghai, China
SM MARINE SERVICE™ supplies both New Equipment and Reconditioned Equipment depending on customer requirements and budget.
We provide worldwide supply, sourcing, repair, calibration, technical support and spare parts services for marine automation, navigation, communication and marine electronic systems.
Website : https://www.smmarineservice.com
Email : info@smmarineservice.com
WhatsApp and Viber : +8801818929292
Marketing Contact: Nazmul Hasan Bhuiyan
Mobile WhatsApp and Viber : +8801730296909
Because the photographs identify the equipment only as a PRU (Power Rectifier Unit) and do not clearly reveal the original Ballast Water Treatment System manufacturer, a verified manufacturer manual cannot be provided without the system brand and model.
To obtain the correct manual, please provide:
SM MARINE SERVICE™ can assist in identifying the exact manufacturer and sourcing the corresponding User Manual, Service Manual, Installation Manual, Wiring Diagram, Spare Parts Catalog, and Technical Documentation.
The Ballast Water Treatment System Power Rectifier Unit (PRU) is a critical component responsible for supplying stable electrical power to ballast water treatment equipment and ensuring compliance with international environmental regulations. Reliable operation of this equipment directly affects vessel compliance, operational efficiency, and system availability.
Whether you require a complete replacement unit, spare parts, troubleshooting assistance, repair services, technical support, calibration, or sourcing of difficult-to-find BWTS components, SM MARINE SERVICE™ can provide professional worldwide support. We supply both New Equipment and Reconditioned Equipment and offer comprehensive marine automation services to ship owners, managers, operators, and shipyards around the world.
For inquiries regarding Ballast Water Treatment System equipment, PRU units, spare parts, repairs, and technical support, contact SM MARINE SERVICE™ today.
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