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Vapor recovery, vacuums and you

Vapor recovery, vacuums and you. Heather Peters, Environmental Specialist. How is the vacuum created?. Tanks are “tight” Product is dispensed No air ingress or vapor return. Vacuum and the Drop Tube. The “stick reading” at the drop tube may not be accurate!

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Vapor recovery, vacuums and you

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  1. Vapor recovery, vacuums and you Heather Peters, Environmental Specialist

  2. How is the vacuum created? • Tanks are “tight” • Product is dispensed • No air ingress or vapor return

  3. Vacuum and the Drop Tube • The “stick reading” at the drop tube may not be accurate! • Are you sticking your tanks for SIR? • Compare to the ATG product level • ‘Equalize’ the tank

  4. Vacuum and the ATG • With vacuum, same amount of product but “level” is higher • CSLD uses data over time • Some data: • Under vacuum (reads high) • Not under vacuum (reads normal/lower)

  5. Is this happening in all of my tanks? • High throughput • “Tight” tanks • P/V valve not functioning • P/V valve cracking under greater vacuum

  6. Are my tests valid? • Static testing should be okay • Standard tank tests with ATG • Tank tightness tests • No reports of problems with interstitial monitoring and double wall tanks

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