Abstract
To identify the effects of the stress concentration at the pit on the fracture of the district heating (DH) pipeline, the stress increase with the wall thickness reduction was formulated. The formula includes the stress intensity factor with the pitting corrosion. As a result of the application of the DH pipeline conditions to the ASME B31.3 code formula and corrosion test, the interplay with only uniform corrosion and stress due to the internal pressure can not be an immediate reason for the DH pipeline fracture. The KI value which is calculated by loss of thickness due to both uniform and localized corrosion exceeded fracture toughness value (42 MPa√m) of the weldment pipeline steel (ASTM A106 Gr. B) under all of the studied conditions. Change of the stress intensity factor caused by internal hoop stress with the corrosion process
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