secondary containment - double trouble · kevin henderson (601) 961-5283...
TRANSCRIPT
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SECONDARY CONTAINMENT -DOUBLE TROUBLE ?
KEVIN HENDERSON17th ANNUAL UST/LUST NATIONAL CONFERENCE
SEATTLE, WASHINGTON
MARCH 15, 2005
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What is it?
How is it performing?
How is it repaired?
What is the future?
SECONDARY CONTAINMENT
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Broad gulf separating manufacturer’s and typical end user’s expectations
Typical end user expects that system will catch and store spills for long
periods of time (until I can get to it)
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Manufacturers expect systems to “temporarily” contain fuel only until leak
is detected and cleaned-up
Temporary storage normally considered to be 72 hours or less
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Temporary storage means close monitoring
is necessary
Continuous leak detection
Sumps must be cleaned-up whenever
a spill occurs
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Should leak detection be relied on to ensure integrity of secondary
containment?
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Manufacturers don’t expect long term fuel exposure but ...
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Catastrophic Leaks Occur
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“Routine” Leaks Occur
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Maintenance Activities Occur
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Material behavior is not understood by
most end users
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When secondary containment works but leak detection does not
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When secondary containment and leak
detection both fail
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SECONDARY CONTAINMENT
EXCAVATION LINERS
DOUBLE-WALLED TANKS
DOUBLE-WALLED PIPING
SUMPS
BULKHEAD FITTINGS
BOOTS
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EXCAVATION LINER
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DOUBLE-WALLED FRP TANKS
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DOUBLE-WALLED STEEL TANKS
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DOUBLE-WALLED COMPOSITE TANKS
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COMPOSITE - STEEL WITH THERMOPLASTIC
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Test Requirements• Vacuum Minimum = 15” Hg• Test Period = 12 Hours• Decrease > 5” = Fail
PERIODIC TANK TEST FORINTERSTITIAL TIGHTNESS
CALIFORNIA INTEGRITY TESTING
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SECONDARY INTEGRITY ?
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REPAIRS ?
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DOUBLE WALLED FRP - 3 OVER 2
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DOUBLE WALLED FRP - INTEGRAL
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SECONDARY INTEGRITY ?
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DOUBLE WALLED - THERMOPLASTIC OVER FRP
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SECONDARY CONTAINMENT ?
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DOUBLE WALLED - SEMIRIGID THERMOPLASTIC
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DOUBLE WALLED - COAXIAL THERMOPLASTIC
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SECONDARY INTEGRITY ?
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SECONDARY INTEGRITY ?
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SECONDARY INTEGRITY ?
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SECONDARY INTEGRITY ?
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tennesseeREPAIRS ?
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THERMOPLASTIC SUMPS
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FRP SUMPS
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STEEL SUMPS
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SHALLOW DISPENSER PANS
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SECONDARY CONTAINMENT - CAJUN
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CAJUN LEAK DETECTOR
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SECONDARY CONTAINMENT - REDNECK
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MISSISSIPPI LEAK DETECTOR
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TERTIARY CONTAINMENT ?
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FRP SUMP INTEGRITY
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THERMOPLASTIC SUMP INTEGRITY
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THERMOPLASTIC SUMP INTEGRITY ?
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STEEL SUMP INTEGRITY
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SUMP BRACING
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SUMP BRACING ?
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SUMP INTEGRITY TESTING
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SUMP INTEGRITY
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SUMP INTEGRITY
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SUMP INTEGRITY
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SUMP INTEGRITY
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SUMP INTEGRITY
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SUMP INTEGRITY
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REPAIRS
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REPAIRS
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REPAIRS
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REPAIRS ?
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SECONDARY CONTAINMENT - “CHASE” PIPE
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SECONDARY CONTAINMENT ?
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SECONDARY CONTAINMENT ?
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SECONDARY CONTAINMENT ?
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“CHASE” PIPE INTEGRITY
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“CHASE” PIPE INTEGRITY
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SECONDARY CONTAINMENT - BULKHEAD FITTINGS
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BOOT SEAL INTEGRITY
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CONDUIT BOOT INTEGRITY
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CONDUIT BOOT INTEGRITY
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PIPE BOOT INTEGRITY
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PIPE BOOT INTEGRITY
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REPAIRS ?
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REPAIRS ?
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REPAIRS
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• Under dispenser containment (UDCs)– 79% of all UDCs failed
in 2001 and 50% of all UDCs failed in 2004
– Penetration fittings were determined to be the primary cause of failure
CALIFORNIA TESTING
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• Tank top containment sumps– 53% of all containment
sumps failed in 2001 and 28% in 2004
– Penetration fittings were determined to be the primary cause of failure
– 100% of HDPE sumps failed the testing in 2001
CALIFORNIA TESTING
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• SB898 (2001) & AB2481 (2003) test results:– 93% of all locations tested
failed at least one secondary containment component
CALIFORNIA CONCLUSIONS
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SECONDARY CONTAINMENT
What is it?Practically anything
What is it intended to be?Remains to be answered
How is it performing?Things could be better
How is it repaired?No clear standards
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Double-walled everything- Sumps; Spill buckets; Vents
Continuous monitoring- Not just electronic sensors- “European” monitoring has
pressurized interstice or vacuum applied
What Does the Future Hold?
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DOUBLE-WALLED SUMPS
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DOUBLE-WALLED SPILL BUCKET
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“SECONDARILY CONTAINED” VENT LINES
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IS THERE ANY HOPE?
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SECONDARY CONTAINMENT MUST BE:Tighter - withstand groundwater intrusion
Stronger - withstand burial and traffic conditions
Compatible - withstand long term fuel exposure
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Changes to UL 971 standard
Create UL standard for sumps (2447)
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