Q557. For blowdown vent stacks does the 98.233.i reference to containers less than 50 cubic feet total physical volume refer to a gas volume or a physical container volume?
A557. The unique physical volume between isolation valves should be considered against the 50 cubic feet threshold for blowdown vent stacks. As stated in 40 CRF § 98.233(i)(2), unique physical volumes smaller than 50 cubic feet are exempt from reporting under § 98.233(i). Please see EPA-HQ-OAR-2009-0923-1018-27 in Response to Comments (pages 1464-1465) (http://www.epa.gov/ghgreporting/documents/pdf/2010/Subpart-W_RTC_part2.pdf).
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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]. Modified by M. Eaddy 7/26/2012
Approval / Publishing History: Version 3, Revised to update URLs per direction from K. Sibold, 9/27/2012
Expiration: none
Relevant Subpart: W
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