§ 129.123. Storage vessels.
(a) Applicability.
(1) Potential VOC emissions. Except as specified in subsections (c) and (d), this section applies to the owner or operator of a storage vessel subject to § 129.121(a)(1) (relating to general provisions and applicability) that has the potential to emit 2.7 TPY or greater VOC emissions.
(2) Calculation of potential VOC emissions.
(i) The potential VOC emissions in paragraph (1) must be calculated using a generally accepted model or calculation methodology, based on the maximum average daily throughput as defined in § 129.122 (relating to definitions, acronyms and EPA methods) prior to February 8, 2023, for an existing storage vessel.
(ii) The determination of potential VOC emissions may consider requirements under a legally and practically enforceable limit established in an operating permit or plan approval approved by the Department.
(iii) Vapor from the storage vessel that is recovered and routed to a process through a VRU is not required to be included in the determination of potential VOC emissions for purposes of determining applicability, if the owner or operator meets the following:
(A) The cover requirements in § 129.128(a) (relating to covers and closed vent systems).
(B) The closed vent system requirements in § 129.128(b).
(iv) If the apparatus that recovers and routes vapor to a process is removed from operation or is operated inconsistently with § 129.128, the owner or operator shall determine the storage vessel’s potential VOC emissions under this paragraph within 30 calendar days of the date of apparatus removal or inconsistent operation.
(b) VOC emissions limitations and control requirements. Except as specified in subsections (c) and (d), beginning December 10, 2023, the owner or operator of a storage vessel subject to this section shall reduce VOC emissions by 95.0% by weight or greater. The owner or operator shall comply with paragraph (1) or paragraph (2) as applicable.
(1) Route the VOC emissions to a control device. The owner or operator shall do the following:
(i) Equip the storage vessel with a cover that meets the requirements of § 129.128(a).
(ii) Connect the storage vessel to a control device or process through a closed vent system that meets the requirements of § 129.128(b).
(iii) Route the emissions from the storage vessel to a control device or a process that meets the applicable requirements of § 129.129 (relating to control devices).
(iv) Demonstrate that the VOC emissions are reduced as specified in § 129.129(k).
(2) Equip the storage vessel with a floating roof. The owner or operator shall install a floating roof that meets the requirements of 40 CFR 60.112b(a)(1) or (2) (relating to standard for volatile organic compounds (VOC)) and the relevant monitoring, inspection, recordkeeping and reporting requirements in 40 CFR Part 60, Subpart Kb (relating to standards of performance for volatile organic liquid storage vessels (including petroleum liquid storage vessels) for which construction, reconstruction, or modification commenced after July 23, 1984).
(c) Exceptions.
(1) The emissions limitations and control requirements in subsection (b) do not apply to the owner or operator of a storage vessel that maintains actual VOC emissions less than 2.7 TPY determined as a 12-month rolling sum. An owner or operator claiming this exception shall perform the compliance demonstration requirements under paragraph (2) and maintain the records under subsection (g), as applicable.
(2) The owner or operator of a storage vessel claiming exception under this subsection shall perform the following:
(i) Beginning on or before January 9, 2023, calculate the actual VOC emissions once per calendar month using a generally accepted model or calculation methodology. The monthly calculations must meet the following:
(A) Be separated by at least 15 calendar days but not more than 45 calendar days.
(B) Be based on the monthly average throughput for the previous 30 calendar days.
(ii) Comply with subsection (b) within 1 year of the date of the monthly calculation showing that actual VOC emissions from the storage vessel have increased to 2.7 TPY VOC or greater.
(d) Exemptions. The emissions limitations and control requirements in subsection (b) do not apply to the owner or operator of a storage vessel that meets one or more of the following:
(1) Is skid-mounted or permanently attached to something that is mobile for which records are available to document that it has been located at a site for less than 180 consecutive days. An owner or operator claiming this exemption shall maintain the records under subsection (g), as applicable.
(2) Is used in the natural gas distribution segment.
(3) Is controlled under 40 CFR Part 60, Subpart Kb or 40 CFR Part 63, Subpart G, Subpart CC, Subpart HH or Subpart WW.
(e) Requirements for a storage vessel removed from service. A storage vessel subject to this section that is removed from service is not an affected source for the period that it is removed from service if the owner or operator performs the following:
(1) Completely empties and degasses the storage vessel so that the storage vessel no longer contains crude oil, condensate, produced water or intermediate hydrocarbon liquids. A storage vessel where liquid is left on walls, as bottom clingage or in pools due to floor irregularity is considered to be completely empty.
(2) Submits a notification in the next annual report required under § 129.130(k)(1) (relating to recordkeeping and reporting) identifying each storage vessel removed from service during the reporting period and the date of its removal from service.
(f) Requirements for a storage vessel returned to service. The owner or operator of a storage vessel identified in subsection (e) that is returned to service shall submit a notification in the next annual report required under § 129.130(k)(1) identifying each storage vessel that has been returned to service during the reporting period and the date of its return to service.
(g) Recordkeeping and reporting requirements. The owner or operator of a storage vessel subject to this section shall maintain the records under § 129.130(b) and submit the reports under § 129.130(k)(3)(i).
Authority The provisions of this § 129.123 added under section 5(a)(1) and (8) of the Air Pollution Act (35 P.S. § 4005(a)(1) and (8)).
Source The provisions of this § 129.123 added December 9, 2022, effective December 10, 2022, 52 Pa.B. 7587.
Cross References This section cited in 25 Pa. Code § 129.121 (relating to general provisions and applicability); 25 Pa. Code § 129.122 (relating to definitions, acronyms and EPA methods); 25 Pa. Code § 129.127 (relating to fugitive emissions components); 25 Pa. Code § 129.128 (relating to covers and closed vent systems); 25 Pa. Code § 129.129 (relating to control devices); and 25 Pa. Code § 129.130 (relating to recordkeeping and reporting).
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