Stress corrosion cracking (SCC) can occur on the soil side of buried natural gas pipelines when the coating breaks down and ground water comes into contact with the pipe surface. A neutral solution and a transgranular crack morphology have been identified with recent field cracking in Canada. A series of experiments have been conducted on fatigue pre-cracked specimens to investigate this type of SCC. Crack growth has been monitored with a direct current potential drop system and fractographic examination. The experimental system developed to investigate the growth of large stress corrosion cracks under relevant field conditions is presented and discussed.

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