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Information × Registration Number 0218U000470, 0117U000722 , R & D reports Title Development of new methods for improving of reliability and durability of the flexible pipes for gas and oil extraction by the coiled tubing technologies popup.stage_title Head Syrotyuk Andriy, Registration Date 14-02-2018 Organization Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine popup.description2 The test series for investigation of specificity of the initial stages of damaging and surface cracks nucleation on the inner and outer surfaces of the flexible pipes were conducted in conditions which are modelling the real operation. The experimental dependences "lengths of surface crack-like defects - number of loading cycles" were determined in air and in special aqueous solution NS4 that is model of underground environments. The diagrams of cyclic crack growth resistance of pipe's steels, which establish the relationship between the surface corrosion fatigue crack growth rate and the number of loading cycles, were constructed. Product Description popup.authors Барна Роман Андрійович Вовк Роман Іванович popup.nrat_date 2020-04-02 Close