crude oil storage tank 8 internal inspection review
TRANSCRIPT
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CRUDE OIL STORAGE TANK 8 INTERNAL INSPECTION REVIEW
PWSRCAC Board Meeting January, 2021
STATUS AND PRELIMINARY FINDINGS
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Review Alyeska’s maintenance and inspection procedures, processes, inspection results and repairs for VMT Crude Tank 8, to identify opportunities to reduce the risk of damage to personel, property and the environment.
Primary Project Goal
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Background Tank 8 Information
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API 653 Inspections
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Initial Finding #1 – 2020 API 653 Report/Return to Temporary Service
Tank Floor Plate
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Initial Finding #1 – 2020 API 653 Report/Return to Temporary Service
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Initial Finding #1 – 2020 API 653 Report/Return to Temporary Service
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Initial Finding #1 – 2020 API 653 Report/Return to Temporary Service
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Initial Finding #1 – 2020 API 653 Report/Return to Temporary Service
• The corrosion rates utilized to justify a 4-year service interval were conservative and reasonable. There is very low risk of a corrosion failure during the current service interval.
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Initial Finding # 2 – Sub-Floor Water Build-up
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Initial Finding # 2 – Potential Causes: Annular Plate Extension Seal
Ringwall/Floorplate Extension without a seal
Typical Ringwall/Floorplate Extension Seal
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Initial Finding # 2 – Annular Plate Extension Seal Failure
2007 Condition of the Tank 8 Annular Plate Extension Seal
Typical Ringwall/Floorplate Extension Seal
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Initial Finding # 2 – Sub Floor Water Saturation Risk
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Initial Finding # 2 – Sub Floor Water Saturation Risk
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Initial Finding # 3 – Tank Cathodic Protection Monitoring
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Initial Finding # 3 – Tank Cathodic Protection Monitoring
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Initial Finding # 3 – Tank Cathodic Protection Monitoring
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Initial Finding # 3 – Tank Cathodic Protection MonitoringCathodic Protection System monitoring requirements are dictated by standards published by the National Association of Corrosion Engineers (NACE).
NACE defines two criteria for cathodic protection • IR Free potential of -850 mV • 100 mV of polarization
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Initial Finding # 3 – Tank Cathodic Protection Monitoring
Polarization “On”“Instant Off”
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Initial Finding # 3 – Tank Cathodic Protection Monitoring
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Initial Finding # 3 – Tank Cathodic Protection Monitoring
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Initial Finding # 3 – Tank Cathodic Protection Monitoring
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Initial Finding # 3 – Tank Cathodic Protection Monitoring
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Initial Finding # 4 – Tank Secondary Containment
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Summary
• Tank 8 Return to Temporary Service• Sub-Floor Water Accumulation• Tank Cathodic Protection Monitoring. • Tank Secondary Containment
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Next Steps
• Pending Data• Final Report Development • Report and Recommendations in May
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Questions?
Thank You for the opportunity to update you!
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Reference Slide