Ms. Danae Smith, NAVSUP Energy Ms. Diane Parks, Defense Logistics Agency Energy

DoD Field Constructed Underground Storage Tanks

Agenda

• Tank Construction • Site Operations & Impacts • Inspections • Leak Detection Program • Testing Methods • Testing Considerations &

Challenges • Regulatory Change

Consequences

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Tank Construction

• ~330 Tanks* in DoD** • Scale

– 25K-12.6M gallons • Construction

– WWII Era – National security

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*Tanks: Field Constructed Underground Storage Tanks **U.S. & U.S. Territories

Tank Construction

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< 1940: Digging the lower access tunnels and installing rail lines for debris removal.

> 1943: Slowly filled tanks with water to test for leaks; re-welded if leaks were found.

Tank Construction

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Tank Construction

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250ft tall = Big Ben Clock Tower in London

Red Hill Construction Video: http://www.youtube.com/watch?v=lIz8IstwnWU

Tank Construction

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Scale - Unique

^ Original 1942 design drawing

< 2014 replica of 1942 design

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On Site Impacts

• Operator Training – A, B, & C

• Walkthroughs – Monthly/Weekly – Tanks/Pipeline – Leak Detection

• Increased Hours

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CA DUSTO Checklist

Cathodic Protection

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Inspections

• Documentation/Records • Top of the tank, sumps, possibly ports

– Will not see inside the tank • Want to know more?

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Red Hill Construction Video: http://www.youtube.com/watch?v=lIz8IstwnWU

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Leak Detection Program

• Established in 2006 • What and Why We Test:

– Leak Testing of Field Constructed USTs to comply with state and federal regulations

– Best Management Practice testing • Leak Detection Testing of Field Constructed

USTs of all sizes • Performed thousands of tests since 2006

• National Work Group on Leak Detection Evaluations listed methods – Automatic Tank Gauging – Point in time

• Minimum Detectable Leak Rates

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Testing Methods

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Testing Considerations & Challenges

• Coordination with mission

• System down time several days

• Set up and isolation

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Testing Considerations & Challenges

• Tank isolation – Big valves have big challenges

• Skilleting/blind flanging • System siphoning effects • Pressurization of in service piping • No product movement • Point in time method sensitivity

– Based on tank surface area – Lower leak rate means longer test period

• Aborting tests • Leak location

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Regulator Change Consequences

• Increased testing frequency • Longer testing events • Tester availability • Increased fuel facility shutdown • Budget considerations

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Questions?