METHOD FOR DETERMINING CHANGE IN QUALITY CHARACTERISTICS OF FUELS FOR JET ENGINES WHEN INTERACTING WITH ANTICORROSION COATINGS IN STORAGE CONDITIONS Russian patent published in 2024 - IPC G01N33/22 C10L1/16 

FIELD: measuring.

SUBSTANCE: invention relates to investigation of the effect of anticorrosion coating applied on inner walls of a tank on jet fuel. Method of determining change in quality characteristics of fuels for jet engines when interacting with anticorrosion coatings under storage conditions for up to 5 years involves dividing a sample of the test fuel for jet engines into five samples of not more than 1.0 dm³ each. Determination of the following physical and chemical properties for the first sample: concentration of actual resins, thermal-oxidative stability, ash content, acidity, iodine number, optical density at wave length 400 nm. Remaining samples of jet fuel are placed in sealed vessels made of inert material. Immersion into the second and third samples of steel plates with dimensions of 150*70*4 mm, on which the investigated anticorrosion coating with a protected edge is applied. Exposure of the second, third, fourth and fifth samples to accelerated aging in a climatic chamber at temperature of 40 °C. Holding for anticorrosion coatings of normal type in a climatic chamber for 1,080 hours, of reinforced type – 1,440 hours, of especially reinforced type – 1,800 hours. Removal of samples after holding in a climatic chamber and settling for 24 hours, determination for the second, third, fourth and fifth fuel samples of the same physical and chemical properties as for the first sample. Evaluation of test results by comparing differences of averaged values of indicators after accelerated aging of the second and third samples and values of corresponding indices of the first sample with differences of averaged values of indices after accelerated aging of the fourth and fifth samples and values of corresponding indices of the first sample. At that, the anticorrosion coating is considered to have failed the tests and is not suitable for use as an anticorrosion coating of fuel storage facilities for jet engines for up to 5 years, if changes in indicators after accelerated aging of the second and third samples compared to changes in values of indicators after accelerated aging of the fourth and fifth samples exceed the following values for: concentration of actual resins – 2.5 mg/100 cm³ of fuel; thermal oxidative stability – 3.0 mg/100 cm³ of fuel; ash content – 0.002 %; acidity – 0.2 mg KOH/100 cm³ of fuel; iodine number – 0.5 g I/100 g of fuel; optical density at wavelength of 400 nm is 0.1 B.

EFFECT: possibility of determining the effect of anticorrosion coating of storage facilities on jet fuel under storage conditions for up to 5 years.

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