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Verification of the ASTM G-124 Purge Equation

Author
Robbins, Katherine E.
Published
October 07, 2009.
Physical Description
1 electronic document
Additional Creators
Davis, Samuel Eddie
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
ASTM G-124 seeks to evaluate combustion characteristics of metals in high-purity (greater than 99%) oxygen atmospheres. ASTM G-124 provides the following equation to determine the minimum number of purges required to reach this level of purity in a test chamber: n = -4/log10(Pa/Ph), where "n" is the total number of purge cycles required, Ph is the absolute pressure used for the purge on each cycle and Pa is the atmospheric pressure or the vent pressure. The origin of this equation is not known and has been the source of frequent questions as to its accuracy and reliability. This paper shows the derivation of the G-124 purge equation, and experimentally explores the equation to determine if it accurately predicts the number of cycles required.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20090042868.
M09-0198.
Twelfth International Symposium on Flammability and Sensitivity of Materials in Oxygen Enriched Atmospheres; 7-9 Oct. 2009; Berlin; Germany.
Terms of Use and Reproduction
Copyright, Distribution as joint owner in the copyright.
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