Gas Release During Saltwell Pumping: Interpretation of Operational Data

Huckaby, J L; Peurrung, L M; Gauglitz, P A

doi:10.2172/10723

Cited by 6 publications

(9 citation statements)

References 13 publications

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“…Similar correlations between pumping and gas release are also observed in headspace gas monitoring data in other tanks (Huckaby et al 1999). (a) The highest gas release rates occur shortly after the onset of pumping, when the waste drains rapidly and pumping rates tend to be high.…”

Section: Expected Gas Releases During Saltwell Pumpingsupporting

confidence: 77%

Effects of Globally Waste Disturbing Activities on Gas Generation, Retention, and Release in Hanford Waste Tanks

Stewart¹,

Fountain²,

Huckaby³

et al. 2005

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Various operations are authorized in Hanford single-and double-shell tanks that disturb all or a large fraction of the waste. These globally waste-disturbing activities have the potential to release a large fraction of the retained flammable gas and to affect future gas generation, retention, and release behavior. This report presents analyses of the expected flammable gas release mechanisms and the potential release rates and volumes resulting from these activities. The background of the flammable gas safety issue at Hanford is summarized, as is the current understanding of gas generation, retention, and release phenomena. Considerations for gas monitoring and assessment of the potential for changes in tank classification and steady-state flammability are given.

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Section: Expected Gas Releases During Saltwell Pumpingsupporting

confidence: 77%

Effects of Globally Waste Disturbing Activities on Gas Generation, Retention, and Release in Hanford Waste Tanks

Stewart¹,

Fountain²,

Huckaby³

et al. 2005

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show abstract

“…Saltwell pumping decreases the region of waste wherein retained gases can reside. It also lowers the hydrostatic pressure experienced by the retained gas, causing it to expand, which in turn enhances the rate of upward bubble migration through the saltcake (Huckaby et al 1999). Headspace hydrogen concentration monitoring data clearly show 2.3 that saltwell pumping causes a significant fraction of retained gases to be released into the headspace (Huckaby et al 1999).…”

Section: Retained Gas Inventories and Compositionmentioning

confidence: 99%

“…It also lowers the hydrostatic pressure experienced by the retained gas, causing it to expand, which in turn enhances the rate of upward bubble migration through the saltcake (Huckaby et al 1999). Headspace hydrogen concentration monitoring data clearly show 2.3 that saltwell pumping causes a significant fraction of retained gases to be released into the headspace (Huckaby et al 1999). (a) To maintain consistency with the safety documentation of and serve as a bounding analysis, this study uses the 95 th percentile void fraction in Table 2.1 as the bounding value to calculate the current retained gas inventory.…”

Section: Retained Gas Inventories and Compositionmentioning

confidence: 99%

Flammable Gas Release Estimates for Modified Sluicing Retrieval of Waste from Selected Hanford Single-Shell Tanks

Huckaby¹,

Wells²

2004

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“…Saltwell pumping decreases the region of waste wherein retained gases can reside. It also lowers the hydrostatic pressure experienced by the retained gas, causing it to expand, which in turn enhances the rate of upward bubble migration through the saltcake (Huckaby et al 1999). Headspace hydrogen concentration monitoring data clearly show that saltwell pumping causes a significant fraction of retained gases to be released into the headspace (Huckaby et al 1999).…”

Section: Retained Gas Inventories and Compositionmentioning

confidence: 99%

Flammable Gas Release Estimates for Modified Sluicing Retrieval of Waste from Selected Hanford Single-Shell Tanks

Huckaby¹,

Wells²

2004

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Mass of solids per bulk waste volume P HS Tank headspace pressure P W Average hydrostatic pressure on retained gas P W* Average hydrostatic pressure on retained gas after drainage of interstitial liquid Q BOUT Volumetric flow of waste out via the retrieval pump Q FG Volumetric flammable gas release rate Q H2O Volumetric water application rate Q RG Volumetric retained gas release rate Q VOUT Volumetric flow of air out via ventilation system Q WIN Volumetric flow of water into the tank R Radius of the tank r Effective radius of central pit T HS Temperature of the headspace T W Temperature of the retained gas T W* Temperature of the retained gas after drainage of interstitial liquid V B Volume of bulk waste disturbed per volume of water applied V G Volume of retained gas at in situ (waste) pressure and temperature V G75% Volume of retained gas at in situ (waste) pressure and temperature required to raise the headspace flammability by 75% of the LFL V GHS Volume of retained gas at atmospheric pressure and headspace temperature V H2O Volume of water available for saltcake dissolution in tank V HS Volume of tank headspace V HS* Volume of tank headspace after drainage of interstitial liquid V HS0 Volume of tank headspace at time zero V IL Volume of interstitial liquid V S Volume of dry void-free solids in the tank V T Volume of waste V TANK Volume of (empty) tank V W

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Gas Release During Saltwell Pumping: Interpretation of Operational Data

Cited by 6 publications

References 13 publications

Effects of Globally Waste Disturbing Activities on Gas Generation, Retention, and Release in Hanford Waste Tanks

Effects of Globally Waste Disturbing Activities on Gas Generation, Retention, and Release in Hanford Waste Tanks

Flammable Gas Release Estimates for Modified Sluicing Retrieval of Waste from Selected Hanford Single-Shell Tanks

Flammable Gas Release Estimates for Modified Sluicing Retrieval of Waste from Selected Hanford Single-Shell Tanks

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