Vehicle Fuel Purification According to Cleanliness Standards

To assess the purity of fuels there are several indicators. These indicators are – maximum size of contaminants and  water content (by percentage and weight in volume).

Equipment operating manuals contain information on oil purity grade, filled into the equipment. Moreover, the purity grade must be specified in documentation during the entire route, starting from manufacturers and finishing with fitting into the line.  Naturally, the highest purity grade of oil should be provided when it is filled into the equipment.

Table 1 Basic requirements for fuel cleanliness according to standards.

Table 1. Fuel cleanliness standards


Automobile gasolines

Diesel fuel

Maximum size of contaminants, microns, not more than



Content by weight, %:
contaminants, not more than





mechanical impurities

Ash content, %

not rated


Tar content, MGM, in 100 ml



Quality indicators of fuel may vary depending on the presence of contaminants also depending on oil properties, and on the conditions of storage, transportation, pumping and environmental pollution.

The main sources and causes of fuel contamination are:

  • ingress of contaminants from the atmosphere;
  • corrosion and oxidation;
  • pumping of fuel through contaminated pipelines;
  • sedimentation of impurities at the bottom of the tank;
  • unsatisfactory state of fueling facilities and sleeves;
  • refueling in an open manner;
  • assembly fuel oil purifier seal failure.

Depending on the state of aggregation, fuel contaminations are: solid, liquid and gaseous.

Solid contaminants are wear products, products of metal corrosion, unstable hydrocarbons condensation, atmospheric, road dust, etc.

Liquid contaminants are mostly water, synthetic-resin and surfactants.

Gaseous contaminations are air and various gases.

Chemical composition allows to divide fuel contamination into inorganic (minerals, water, air) and organic (compounds with hydrocarbon structure).

Also there is a common classification on the basis of origin, or the entry into fuel.  In accordance with this classification, fuel contaminations are:

  • industrial pollution;
  • operational pollution;
  • consumption pollution.

Given classification allows to  increase fuel purity by determining the causes and sources of pollution, as well as prevent their occurrence.

In general, the causes and sources of of pollution can be divided into three stages:

  1. Obtaining fuel from refineries already contaminated with corrosion products, soaps of naphthenic acids, atmospheric dust etc.
  2. Transportation in railway tanks containing atmospheric dust and corrosion products etc.
  3. Pumping on tank farms and  gas stations contacting with residual contaminants, wear products, dust and corrosion products.

Regardless of the source of pollution, fuel must be cleaned to the high purity grade before pouring it into the system.  For such operations the equipment must meet certain requirements.  One of the main criteria for this – is universality i.e. possibility to remove most of the harmful contaminants from fuel  and work with different types of petroleum products without significant technical re-equipment.

GlobeCore is one of the largest manufacturers of equipment for the purification and recovery of oil products, that has commercial relationships with more than 70 countries.

GlobeCore UVR plants clean and bleach furnace and diesel fuel, gas condensates, gasoline and other types of oil products.  For example,  when diesel fuel gone dark, oxidized by long-term storage with ingress of water and other fuel components, UVR plant can remove hydrogen sulfide compounds, reduce the concentration of sulfur and paraffins, and remove unsaturated hydrocarbons. After purification  refined fuel does not oxidize or darken again.

GlobeCore purification technology is a competent investment that prevents  fuel failure rather than fight with the consequences.  Clean fuel provides reliable operation of vehicles!



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