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Q543. This question relates to subpart W, Acid Gas Removal Vents, using Calculation Methodology 3 (98.233.d). In 98.233.d.8 are we allowed to assume that volume fraction of CO2 content in natural gas out of the AGR unit is zero? This will result in a conservative estimate of AGR vent emissions.
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A543. No. §98.233(d)(8) does not instruct reporters to assume a volumetric fraction of zero for Vol{~}0~ . Reporters must use one of the methodsologiesmethods specifiedprescribedspecified in §98.233(d)(8) to determine the CO{~}2~ contentcompositioncontent of the natural gas exiting the AGR unit (Vol{~}0~ ).

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Source: EPA, Frequently Asked Questions, Petroleum and Natural Gas Systems, July 2011, [http://www.epa.gov/climatechange/emissions/downloads11/documents/Subpart-W-additional-faq.pdf].  Updated to clarify subscripts

Approval / Publishing History: Version 2, approved by M. Eaddy, 6/4/2012

Expiration : none

Relevant Subpart: W, Acid Gas Removal
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