Fuel Polishing System

Fluidyne’s Fuel Polishing System is a dedicated diesel fuel conditioning solution designed to maintain fuel cleanliness within the limits defined by EN 590 and ISO 4406. Diesel fuel degradation due to particulate contamination and free or emulsified water occurs due to storage tanks and directly impacts engine reliability, injector life, and fuel efficiency.

Our Fuel Polishing System continuously cleans stored diesel by circulating fuel through high-efficiency filtration and water separation stages within the same storage tank. Unlike production-line NAS filtration systems, diesel fuel polishing operates in a closed-loop mode, ensuring clean, water-free diesel.

Core Information

The Fuel Polishing System configuration is optimized specifically for diesel fuel conditioning and cleanliness control.

  • Closed-loop circulation of diesel from and back into the same storage tank

  • Flow generator – Typically a helical gear pump
  • Pre-filter – 100 micron basket strainer (optional)

  • 0.8 micron particle separator for fine particulate contamination (for mining applications)

  • High-efficiency coalescer cartridge / for coalescing water droplets
  • Final water separator cartridge to resist passage of water and allowing only diesel to pass
  • Water in fuel sensor with alarm feedback
  • Control Panel with PLC to control and monitor the polishing process
  • Diesel in tray detection sensor
  • 0.8 micron particle separation
  • Multi-stage filtration system

  • Water separators and coalescers

  • EN 590 compatible design
  • ISO 4406 cleanliness support
  • Closed-loop fuel circulation
  • Continuous fuel conditioning
  • Compact skid-mounted system
  • Low maintenance operation
  • Industrial-duty components
  • Maintains diesel fuel quality in line with EN 590 standards
  • Achieves consistent ISO 4406 cleanliness codes
  • Extends injector, pump, and engine life
  • Prevents microbial growth caused by water contamination
  • Removes fine particles down to 0.5 micron
  • Eliminates free and emulsified water using coalescers
  • Reduces unplanned engine downtime
  • Improves combustion efficiency and fuel reliability
  • Operates without interrupting fuel supply

Applications

Fuel Polishing Systems are deployed wherever diesel is stored for extended periods or used in critical equipment.

Fuel depots

Data centers

Mining sites

Offshore storage

Related Product

Series 7101 – Fuel Polishing Unit

  • Catalogue

  • Instruction manual

FAQ’s

What is a fuel polishing system?

A fuel polishing system is a diesel conditioning unit that continuously circulates fuel within the same tank to remove particles and water, maintaining cleanliness as per EN 590 and ISO 4406 standards.

Fuel polishing system draws diesel from the tank, passes it through fine particle filters and water separators, and returns the cleaned fuel back to the same tank in a closed-loop process.

Key components include a circulation pump, 0.5 micron particle filters, water separators, coalescers, PLC-HMI panel for control and monitoring

Yes. A Fuel Polishing System continuously conditions diesel inside the same tank in a closed-loop cycle. A NAS filtration system or hydraulic oil filtration system operates with separate dirty oil and clean oil streams to achieve NAS cleanliness levels in hydraulic and industrial oil applications

Fuel Polishing System installations are commonly used in generator fuel tanks, marine diesel storage, industrial fuel depots, hospitals, data centers, mining equipment, and backup power applications where diesel fuel remains stored for long durations.