FAQs > Rule Subparts > Subpart W. Petroleum and Natural Gas Systems > Other - Dehydrators > 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).
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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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