U.S. EPA Updates Air Standards for Tanks Used in Oil and Natural Gas Sector

Posted on October 4, 2013 by Chester Babst

EPA is still working the kinks out of its New Source Performance Standards (NSPS) for the Oil and Natural Gas Sector, i.e., 40 C.F.R. 60 Subpart OOOO, referred to by many as the “Oil and Gas NSPS” and by some as simply “Quad O”.  EPA first published the proposed Oil and Gas NSPS on August 23, 2011, in conjunction with proposed revisions to three other air regulations affecting various segments of oil and natural gas operations.  The proposal prompted more than 150,000 public comments and kindled a national discussion on emissions at natural gas well sites.  The final Oil and Gas NSPS rule was published in August 2012.  Although the rule is most famous for establishing the first federal air standards for hydraulically-fractured natural gas wells, the rule also set significant volatile organic compound (VOC) standards for “storage vessels” used by the oil and natural gas industries.

Several stakeholders responded to the August 2012 rulemaking by filing petitions for administrative reconsideration of the Oil and Gas NSPS.  On April 12, 2013, EPA published a notice granting reconsideration for a number of issues and proposing revisions to the storage vessel standards, in particular.  Evidently, EPA significantly underestimated the number of storage vessels coming online in the field when it developed the August 2012 final rule, which required individual storage tanks with VOC emissions of 6 tons or more per year to achieve at least 95% reduction in VOC emissions.  Tanks are commonly used at natural gas well sites, for example, to store condensate, crude oil, and produced water.  In light of an updated tank estimate, EPA recognized that additional time would be needed for manufacturers to produce a sufficient number of VOC control devices. 

Most recently, on September 23, 2013, EPA published final revisions to the storage vessel requirements in the 2012 Oil and Gas NSPS.  Per the revised rule, which was immediately effective, an individual tank may be considered an affected facility if its construction, modification or reconstruction commenced after August 23, 2011; it has potential VOC emissions of 6 tons or more per year; and it contains crude oil, condensate, intermediate hydrocarbon liquids, or produced water.  EPA made a number of important adjustments in the revised rule, chief among them an extension of the compliance date to give tank owners and operators more time to purchase and install controls.  For the so-called “Group 1” storage vessels (which were constructed, modified or reconstructed between the August 2011 original proposal and the April 2013 proposal), the deadline to control VOC emissions is now April 15, 2015.  For “Group 2” storage vessels (i.e., vessels that come online after April 12, 2013), the compliance deadline is April 15, 2014.  Notably, pursuant to the revised Oil and Gas NSPS, operators only have until October 15, 2013 to estimate potential VOC emissions of Group 1 storage vessels for purposes of determining whether the rule applies.

Meanwhile, the agency is continuing to evaluate other issues raised in the reconsideration petitions that were submitted in response to the August 2012 rulemaking.  EPA has stated in the past that it intends to address the remaining issues by the end of 2014.



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