IMPROVEMENT OF THE METHOD FOR DETERMINING THE CONTENT OF DISSOLVED GASES IN MOISTENED TURBINE OILS

Abstract

The paper presents the results of a study on improving the method for determining the content of dissolved diagnostic gases CH₄, C₂H₆, C₂H₄, C₂H₂, C₃H₆, C₃H₈, H₂, CO, CO₂, O₂, N₂, H₂S in moistened mineral oils "Agrinol Tp-30", "Azmol Tp-22c", "Tp-22 (grade 1)" and in synthetic fire-resistant turbine oil "Fyrquel^®L" using gas chromatography techniques. Purpose: ensuring the reliability of the results of the study of the content of diagnostic dissolved gases in samples of moistened mineral and synthetic fire-resistant turbine oils for further diagnosis of bearings with forced circulation of these oils. Methods: a) determination of the moisture content of energy oils by coulometric titration; b) gas chromatographic determination of: concentrations of dissolved gases in energy oils; concentrations of gases in gas mixtures; distribution coefficients for gases dissolved in energy oils in the system "energy oil – dissolved gas – gaseous extractant". Results: the solubility of these gases in mineral turbine oil "Tp-22с (grade 1)" and in synthetic fire-resistant turbine oil "Fyrquel^®L" with a moisture content of 0.002 % by weight (homogeneous liquids) at a temperature of 25 ⁰C; the dependence of solubility values for H₂S on temperature in the system "mineral turbine oil – dissolved H₂S gas" in the temperature range of 15–80 ⁰C; distribution coefficients for these dissolved gases in liquids at a temperature of 20 ⁰C in the systems "turbine oil – dissolved gas – gaseous extractant (argon)" or "turbine oil – dissolved gas – water"; content of dissolved diagnostic gases in model synthetic fire-resistant turbine oils "Fyrquel^®L" by the method of the appendix. Conclusions: a) the values of the distribution coefficients for the corresponding dissolved i-th gases (or their solubility) in the studied liquids practically do not depend on the nature of turbine oils (mineral or fire-resistant synthetic turbine oils), or the content of water in them in the range of its concentrations of 0.002–0.05 % by weight; b) for the turbine oil "Tp-22с (grade 1)", an increase in temperature leads to a decrease in the values of the distribution coefficients (or solubility) for H₂S; c) the possibility of determining the content of dissolved diagnostic gases in model synthetic fire-resistant turbine oils "Fyrquel^®L" by the application method is shown.