IMPULSE TEMPERATURE INFLUENCE ON STRESS-CORROSION CRACKING OF BIG-DIAMETER GAS MAINS
After solving the inverse task of heat conductivity on the basis of processed temperature fields of the initial part of 1420 mm gas pipeline Polyana-Moskovo the results were obtained that establish the fact of heat conductivity and ground humidity change not only along the pipe contour but in the course of time as well. During continuous observations impulse humidity change (1,5…2 times and more) in the zone of pipeline outer surface contact with the ground was fixed synchronous to the temperature change of the gas flow.
Based on the researches made it is possible to conclude that impulse change of pipe wall temperature causes synchronous change of the adjoining ground temperature and humidity. This fact may be regarded as the impellent that activates electrochemical corrosion and bio-corrosion. This phenomenon reveals itself in discrete stress cracking of metal and in the direction of maximum development of stress.
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