Q579. The emission methods for dehydrator vents with daily throughputs less than 0.4 MMscfd in the preamble (use flow rate of wet NG and EF) contradict the requirements in the rule (use dehydrator count and EF).
A579. Reporters with dehydrators with annual average daily throughputs less than 0.4 million standard cubic feet per day (MMscfd) must count the total number of such dehydrators and apply an emission factors, as provided in §98.233(e)(2) and Equation W-5, to estimate emissions. Where inconsistencies occur, rule language supersedes preamble language.
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Source: EPA, Frequently Asked Questions, Petroleum and Natural Gas Systems, July 2011, http://www.epa.gov/ghgreporting/documents/pdf/2011/documents/Subpart-W-additional-faq.pdf
. Clarified
Approval / Publishing History: Version 1, Approved by M. Eaddy, 6/4/2012
Expiration : none
Relevant Subpart: W, Dehydrators
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