Abstract
Damage mechanism on carbon steel pipeline due to hydrogen attack (HA) in refinery was identified using magnetic particle inspection (MPI). Visual inspection at external do not reveals any failure which may cause catastrophic accidents. Non-destructive evaluation (NDE) using MPI reveals some fissuring contribute to cracks penetrate from internal to the surface of pipeline caused the leak to propagate. MPI technique also may detect closely up to 20mm of crack length and proven can be one of the best NDE to identify corrosion attack in high temperature process. The findings also revealed HA not only affected at welded area, but also on base metal. Visual observation was continued with microscopic analysis reveals fissuring crack initiate from intergranular corrosion. Mechanical properties analysed using hardness test revealed that, the steel toughness cannot be rely as a guideline to assume pipeline integrity even though decreasing the amount of carbon at elevated process temperature due to HA reactions. The conclusion is, MPI technique can be relied as one of the NDE tools to identify corrosion failure due to HA.
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