valdez marine terminal status of crude oil storage tank
TRANSCRIPT
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Valdez Marine Terminal Status of Crude Oil Storage Tank Inspections
OSPR, TOEM Committees PWSRCAC Staff: Tom Kuckertz, Linda Swiss Contractor: Harvey Consulting
May 2012 Board Meeting
Why Are Internal Tank Inspections Important?
1. Critical Oil Spill Prevention Measure
2. Collects Data that External Inspections Do Not
3. Evaluates Tank Foundation, Bottom, Shell, Structure, Roof, Nozzles, and Fire System
4. Protects Environment
5. Protects Personnel
6. Protects Asset
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External Inspections Completed Every 5 Years
1. Shell Exterior
2. Roof Exterior
3. Foundation Exterior
Internal Inspections Evaluate Additional Factors
1. Tank Floor
2. Annular Ring Plates
3. Shell Interior
4. Roof Interior
5. Roof Support Structure
6. Fire Protection System
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Tank Floor
Roof and Roof Support System
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Fire Protection System
API 653 Tank Inspection Industry Standard
Recommends minimum 10-Year Internal Inspection Interval unless:
1. There is corrosion data from that tank to support a longer inspection interval
or 2. There is similar service data (from another
equivalent tank) to support a longer inspection interval
ADEC Regulations do not allow similar service
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Considerations in Setting Internal Tank Inspection Interval
6. Cathodic Protection
7. Leak Detection
8. Modifications
9. Change in Service
10. Change in Operation
1. Floor integrity
2. Shell integrity
3. Roof integrity
4. Fire system
5. Pollution Risk Tank Floor Integrity Drives the API Inspection Interval
Other factors are important but not included in the calculation.
PWSRCAC Board Meeting
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ADEC Regulations on Tank Inspections Intervals
18 AAC 75.065 Field-Constructed Aboveground Oil Storage Tank Requirements. (b) inspection intervals . . .
(1) may be reduced by the department for tanks (A) over 30 years old (B) that is riveted
(C) with demonstrated structural, corrosion or foundation problem, or (D) after a seismic event
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ADEC Regulations on Tank Inspections Intervals
Meaning that to extend a tank inspection interval beyond 10 years there must be tank floor corrosion data for that tank
18 AAC 75.065
Field-Constructed Aboveground Oil Storage Tank Requirements. (a) Must follow API 653 inspection standard (b) may not be based on similar service
ADEC Regulations on Tank Inspections Intervals
18 AAC 75.065
Inspection intervals for a field constructed aboveground oil storage tank (3) may be based upon risk-based inspection . . . assessment must include
(A) a quantitative risk assessment, signed by a registered engineer and conducted in accordance with the American Petroleum Institute’s Risk Based Inspection . . . (API RP 580).
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ADEC Regulations on Tank Inspections Intervals
18 AAC 75.015
Waiver. (a) The dept may waive a requirement . . . if the owner . . . demonstrates to the dept’s satisfaction that an equivalent level of protection will be achieved by using a technology or procedure other than the technology or procedure required by 18 AAC 75.005-18 AAC 75.085.
Current Tank Status
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Table 2-7 VMT C-Plan Sets Inspection Dates
2
Tanks Currently Out of Service
West Tank Farm East Tank Farm
17 15
18 16 13 11 9 7 5 3 1
14 12 10 8 6 4 2
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2 West Tank Farm East Tank Farm
Tanks with 1 API 653 internal inspections
Tanks with 2 API 653 internal inspections
17 15
18 16 13 11 9 7 5 3 1
14 12 10 8 6 4 2
2
Tanks with 20 year extensions
West Tank Farm East Tank Farm
17 15
18 16 13 11 9 7 5 3 1
14 12 10 8 6 4 2
1
2
3
4612
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2
Tanks Requiring Inspection in 2012
West Tank Farm East Tank Farm
17 15
18 16 13 11 9 7 5 3 1
14 12 10 8 6 4 2
Recently Extended to 2014 Extension Rejected
Valdez Marine Terminal Status of Crude Oil Storage Tank Inspections
Questions and Answers
May 2012 Board Meeting