Flammable gas tank safety program: Technical basis for gas analysis and monitoring

Estey, S.D.

doi:10.2172/362478

Cited by 1 publication

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“…This mixture would be just flammable (100% LFL) on the conservative assumptions that the LFLs for pure hydrogen and ammonia were, respectively, 3.5 vol% (35,000 ppm) and 8 vol% (80,000 ppm). These are the LFLs that were assumed in an earlier document (Estey 1998).…”

Section: 2mentioning

confidence: 99%

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Review of the Technical Basis of the Hydrogen Control Limit for Operations in Hanford Tank Farms

Mahoney¹,

Stewart²

2002

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The radioactive waste in Hanford tanks generates a flammable gas mixture and releases it into the tank headspace. The potential hazard resulting from flammable gas generation requires that controls be established to prevent ignition and halt operations if gas concentrations reach levels of concern. A control limit of 6,250 ppm hydrogen has been in use at Hanford for several years when only hydrogen is monitored. The hydrogen-based control limit is intended to conservatively represent 25% of the lower flammability limit of a gas mixture, accounting for the presence of flammable gases other than hydrogen, with ammonia being the primary concern. This report reviews the technical basis of the current control limit based on observed and projected concentrations of hydrogen and ammonia representing a range of gas release scenarios. The conclusion supports the continued use of the current 6,250-ppm hydrogen control limit.iv v

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Section: 2mentioning

confidence: 99%

“…The control limit was set at 6,250 ppm of hydrogen (Estey 1998). This limit is 25% of the hydrogen concentration of a mixture containing 2.5 vol% hydrogen and 2 vol% ammonia (an ammonia/hydrogen ratio of 0.8).…”

Section: Observationsmentioning

confidence: 99%

Review of the Technical Basis of the Hydrogen Control Limit for Operations in Hanford Tank Farms

Mahoney¹,

Stewart²

2002

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show abstract

Flammable gas tank safety program: Technical basis for gas analysis and monitoring

Cited by 1 publication

References 2 publications

Review of the Technical Basis of the Hydrogen Control Limit for Operations in Hanford Tank Farms

Review of the Technical Basis of the Hydrogen Control Limit for Operations in Hanford Tank Farms

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