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Hydrocarbon Utilizing Micro-organisms (HUM bugs)

Three types of contamination effect diesel - Water, solid inorganic and microbial.

  • Water is removed and kept at a minimum by draining tanks and having a water separator before or included with the fuel filter.

  • Solid inorganic contaminates are kept to minimum by the fuel filter.

  • Microbial contamination - Bacteria, yeasts and fungus is eliminated by fitting a De-Bug Unit before the primary fuel filter. The fuel delivered to the engine and the also the fuel returned to the tank is free of bugs.

Twenty-seven (27) individual species of bugs can occur in diesel fuel:

  •  Bacteria utilise hydrocarbons and reproduce 'asexually' by binary fission; swelling in size as they feed, they then separate into two cells. In this way microbes double their numbers every 20 minutes, one spore becomes 262,144 in 6 hours.  Typical bacteria known to utilise hydrocarbons are Pseudomonas aeruginosa, other Pseudomonas species, Flavobacterium spp., Acinetobacter spp., Alcaligenes spp., Micrococcus spp., Arthobacter spp., Corynebacterium spp., Brevibacterium spp., Klebsiella app.

  • Yeast bud onto the parent cell, then eventually separate. Reproduction takes several hours and yeast prefer acidy environments. Typical yeasts growing on hydrocarbons are Candida spp., Saccharomyces spp., Torula spp., Torulopsis spp., Hansenula spp.

  • Fungus grow in the form of branched hyphae, a few microns in diameter, forming thick, tough, intertwined mycelial mats at fuel/water interfaces. Typical moulds which degrade hydrocarbons are Penicillium spp., Aspergillus spp., Fusarium spp., Monilia spp., Botrytis spp, Cunninghammella spp., Scopulariopsis spp., Cladisporium resinae,  Hormonicus resinae.

  • Sulphate Reducing Bacteria (SRB) are a specific group of bacteria utilizing simple carbon, not hydrocarbons, and require the activity of other microbes in a consortium. SRB produce hydrogen sulphide. SRB are also directly involved with many microbial corrosion reactions and can cause sulphide souring of stored distillate products.

  • Restricted fuel flow, uneven atomization and incomplete combustion caused by slime build up in the fuel lines, filters and injector needles.

  • Cylinders develop cool spots causing uneven wear to the rings and cylinder bores. Acids and gums can eventually leach into the lubricating oil, causing corrosion of the crank components.  

  • Some species create acids that remove ions from the atomic structure of metals: this is the main cause of corrosion in fuel tanks, lines, pumps and injectors.

The presence of bugs in fuel has a definite effect on the quality of diesel and is responsible for increasing operating costs

  • Increase fuel burn

  • Increase maintenance required on filters, fuel pumps and injectors

  • Increase exhaust smoke

  • Increase equipment running costs

  • Decrease power

  • Decrease reliability 

  • Decrease service life of all fuel system components

By fitting a De-Bug Clean Fuel Unit all diesel bugs eliminated

  • Provide Real Savings 

  • Last For Years 

  • Require the Minimum of Maintenance 

Simply by running the engine or a recirculation pump, the fuel is kept clean and fresh. Savings




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