Duplex stainless steel pipe and flange conforming to ASTM A790 2507 and ASTM A182 F51, failed after two years of service. It was a multiphase flow of natural gas, condensate and water. The conditions were severe: salinity was 12% and temperature was 57 to 75 C. The ferrite % in the weld root was low: 30-25% in some locations. The failures are seen in the attachments. Both damages occur at the 6 o'clock position. Installing dehydration units, as a remedy, seems impractical at this stage. I would appreciate if you can share some or your ideas and experience for solutions, solutions out of the box.
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Waleed Khalifa
Principal and CEO
Arabic Consultancy Center for Engineering Materials, Inspection
Maadi, Cairo
01098163293
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