The work is devoted to solving the problem of increasing the operational reliability of industrial thermal insulation, taking into account the prediction of changes in its properties during operation. A series of experiments was carried out with samples of mineral wool insulation made of basalt fiber of different density. The dependence of thermal conductivity λ of basalt fiber insulation on density and temperature in the range from 50 to 350 °С is presented.

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Summary Research is devoted to increase in system effectiveness of transportation of thermal energy. The control system of thermal insulation properties realized in the environment of LabVIEW is developed. Assessment of transport losses of heat taking into account real service conditions of pipelines and heterogeneity of thermal insulation properties is carried out. Influence of extent of aging of thermal isolation on increase in size of density of a thermal stream is shown. Calculation of specific thermal losses of an elevated steam line taking into account thermal destruction of isolation is carried out.

This paper investigates fibrous thermal insulation materials of various densities to assess the change in their thermophysical properties at high temperatures. The thermal conductivity of fibrous thermal insulation materials is discussed as a function of the temperature in the range from 50 °C to 500 °C. It is shown that the thermal insulating properties depend not only on the physical properties of the material (e.g., density or diameter of fibres), but also on the geometric parameters of the structure and on the orientation of the fibres. The influence of high temperatures on the mass change of fibrous materials associated with the burnout of synthetic binders is shown. These features should be taken into account during the design of thermal insulation operating at high temperatures to provide the optimal selection of the material and to guarantee the stability of their thermal properties.

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