METHOD OF DETERMINING DURATION OF PERIOD BEFORE FORMATION OF STRESS-CORROSION CRACKS IN STEEL PIPELINES Russian patent published in 2008 - IPC C23F13/02 G01N17/00 

FIELD: chemistry.

SUBSTANCE: method includes cathode protection of samples from pipe steel, change of inner sample stress and metallographic analysis of pipe steel microstructure, additionally determined is increase of hydrogen pressure in near-surface layer of samples ΔP_H2 in atm/24 hours, taking into account operation pressure of transported product in pipelines on tearing force from hydrogen pressure and cathode protection mode, critical hydrogen pressure in near-surface layer of P_H2 samples in atm is determined taking into account operation pressure of transported product in pipelines, after which duration of period in years before formation of stress-corrosion cracks is determined by formula P_H2/365*ΔP_H2, where 365 is number of days (24 hour periods).

EFFECT: increasing accuracy of predicting pipeline tears taking into account reduction of duration of stress-corrosion cracks period.

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