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FLUID FERTILIZER TECHNOLOGY WORKSHOP
STORAGE TANK MAINTENANCE & MONITORING INTERNAL TANK LINERS
December 8, 2015 - Louisville, Kentucky
Chris Brooks
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ABOVE GROUND STORAGE TANK MAINTENANCE & MONITORING
• Why owners should perform visual inspections on a regular basis
• Why owners should have an API-653 inspection
• When should owners have an API-653 inspection
• Who is an API-653 Inspector
• What is included in an API-653 inspection
• What CAN happen
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Shop built as well as field erected tanks should be inspected
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OWNER CONDUCTED INSPECTIONS
Regular on-site (owner performed) inspections provide a proactive way to minimize or prevent repair costs
Reduce down time for repairs
Prevent and/or reduce leakage into containment
Prevent potential product release into ground and water environments
Reduce down-time for repairs and prevent loss of product
Limit corrosion acceleration to external areas
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OWNER CONDUCTED INSPECTIONS
Monthly inspections should monitor the external coating on the tank shell and roof, the overall condition of the tank, piping, secondary containment and ancillary equipment.
Drainage issues or loss of foundation from washout
Weekly inspections should include stains on the steel, dead grass or other indications a leak may be present.
Testing of leak monitor valves
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Regular owner performed visual inspections could prevent down time and out-of-service issues that may arise.
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What a Liner Should Look Like
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Why API-653 Inspections
Establish a baseline of condition, corrosion rate and remaining life of steel
Provide detail on mandatory and discretionary repairs
Meets or exceeds state regulatory requirements for permit renewal
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When to have an API-653 Inspection Performed The Fertilizer Institute Recommendations
As an initial baseline a complete API 653 out-of-service internal and external inspection shall be performed to establish the condition of an existing AST and to determine the AST’s suitability for continued service.
For non coated tanks or tanks without bladders, an internal inspection using the API 653 checklist should be conducted by an API authorized inspector at frequencies recommended by API 653 or RBI assessment. The tank should be given an *inspection by an API authorized inspector at intervals not greater than the lesser of five years or the interval established by the corrosion rate in accordance with API-653
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What is Included in an API-653 Inspection
Ultrasonic Thickness (UT)testing of all shell, roof and floor plates
Vacuum testing of all floor weld seams unless coated
Visual inspection of plates, welds, appurtenances and ancillary equipment
Settlement Survey
Provide calculations for safe or maximum fill height
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Who is an API-653 Inspector
Must pass a written exam conducted by the American Petroleum Institute (API)
Recertification is required every six years • Inspectors must not only maintain a
minimum standard of knowledge but present an understanding of new codes and protocols.
Certified inspectors receive an individual
inspector number
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What is Included in an API-653 Inspection
Check for code violations including 4 way junctions, improperly installed shell inserts, and weld spacing
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Sludge and deep deposits may require sandblasting to remove
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Settlement issues created rafters twisting and required a full roof replacement
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Tanks that are not inspected are at risk for WHAT CAN HAPPEN
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Inspections provide a safety margin of security
Identify repairs before they become significant
Prevent delays and fines in permit renewal
Tanks without internal containment liners should be cleaned every 2-3 years
Full internal and external API-653 Inspections should be completed every 5 years
All repairs should be made to API-653 standards
Protecting Your ASSets
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Questions?