Abstract
Every year the length of polyethylene (PE) pipelines with service life of 40–50 years are growing, wherein the limiting amount of service life is 50 years. Operating and state organizations responsible for industrial safety face an important question: is it possible to continue the safe operation of pipelines with an expired service life, or is it necessary to replace pipelines, which will require large investments. Studies were carried out to assess the prospects of using test methods in the technical diagnostics of polyethylene gas pipelines. The article presents the results of a study of small-sized samples of PE pipes of gas pipelines with various service life (from 24 to 55 years) using differential scanning calorimetry, X-ray diffraction analysis and infrared spectroscopy. The time and temperature of oxidative induction, the degree of crystallinity of the samples, and the size of the crystals were studied, and the IR spectra of each sample were obtained and analyzed. Based on the results of the study, it was concluded that the method of differential scanning calorimetry and X-ray diffraction analysis are informative in the study of the physicochemical properties of polyethylene pipelines with different service lives.
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