§ 63.11497 — What Are The Standards And Compliance Requirements For Storage Tanks?

(a) Organic HAP emissions from storage tanks. You must comply with the emission limits and other requirements in table 5 to this subpart and in paragraphs (b) through (f) of this section for organic HAP emissions from each of your storage tanks that meet the applicability criteria in table 5 to this subpart.

(b) Planned routine maintenance for a control device. Operate in accordance with paragraphs (b)(1) through (3) of this section for periods of planned routine maintenance of a control device for storage tanks.

(1) Add no material to the storage tank during periods of planned routine maintenance.

(2) Limit periods of planned routine maintenance for each control device (or series of control devices) to no more than 240 hours per year (hr/yr), or submit an application to the Administrator requesting an extension of this time limit to a total of 360 hr/yr. The application must explain why the extension is needed and it must be submitted at least 60 days before the 240-hour limit will be exceeded.

(3) Keep records of the day and time at which planned routine maintenance periods begin and end, and keep a record of the type of maintenance performed.

(c) SSM provisions. References to SSM provisions in subparts that are referenced in paragraphs (a) or (b) of this section or table 5 to this subpart do not apply.

(d) Combustion of halogenated streams. If you use a combustion device to comply with the emission limits for organic HAP from a halogenated vent stream from a storage tank, you must reduce emissions in accordance with § 63.11496(d) and the requirements referenced therein.

(e) Pressure vessels. If you are required to comply with this paragraph (e) as specified in item 5 of table 5 to this subpart (for each pressure vessel with a design capacity greater than or equal to 20,000 gallons), you must operate and maintain the pressure vessel, as specified in paragraphs (e)(1) through (5) of this section.

(1) The pressure vessel must be designed to operate with no detectable emissions at all times.

(2) Except for equipment that meet the criteria specified in § 63.11495(a)(6)(ii)(A) (for valves, connectors, and pumps in gas/vapor service and in light liquid service that are unsafe to monitor), § 63.11495(a)(6)(ii)(C) (for valves in gas/vapor service and in light liquid service that are difficult-to-monitor), and § 63.11495(a)(6)(ii)(E) (for connectors in gas/vapor service and in light liquid service that are inaccessible or ceramic or ceramic-lined), you must monitor each point on the pressure vessel through which organic HAP could potentially be emitted by conducting initial and annual performance tests using Method 21 of appendix A-7 to part 60 of this chapter.

(3) Each instrument reading greater than 500 ppmv is a deviation.

(4) Estimate the flow rate and total regulated material emissions from the defect. Assume the pressure vessel has been emitting for half of the time since the last performance test, unless other information supports a different assumption.

(5) Whenever organic HAP are in the pressure vessel, you must operate the pressure vessel as a closed system that vents through a closed vent system to either a control device (other than a flare) in accordance with § 63.982(c); or a flare in accordance with § 63.982(b). For purposes of compliance with this paragraph, a release of organic HAP through a pressure vessel's pressure relief device to the atmosphere is a deviation.

(f) Exceptions and alternatives to subpart SS of this part. If you are complying with a percent reduction, mass emission limit, or outlet concertation performance standard in table 5 to this subpart for storage tanks, then the provisions in paragraphs (f)(1) and (2) of this section apply in addition to the provisions in subpart SS of this part.

(1) Requirements for performance tests. (i) The requirements specified in paragraphs (f)(1)(ii) through (iv) of this section apply instead of, or in addition to, the requirements specified in subpart SS of this part.

(ii) Upon request, you shall make available to the Administrator, such records as may be necessary to determine the conditions of performance tests.

(iii) If a performance test has never been conducted, conduct an initial performance test no later than 180 days after the compliance dates specified in § 63.11494(i). Begin conducting subsequent performance tests no later than 180 days after the compliance dates specified in § 63.11494(i) or 60 calendar months after the previous performance test, whichever is later. You must record the process information that is necessary to document operating conditions during the test and include in such record an explanation to support that such conditions represent the entire range of normal operation, including operational conditions for maximum emissions if such emissions are not expected during maximum production.

(iv) Beginning on June 1, 2026, within 60 days after the date of completing each performance test required by this subpart, you must submit the results of the performance test following the procedure specified in § 63.9(k). Submit the data in a file format generated using the EPA's Electronic Reporting Tool (ERT). Alternatively, you may submit an electronic file consistent with the extensible markup language (XML) schema listed on the EPA's ERT website (https://www.epa.gov/electronic-reporting-air-emissions/electronic-reporting-tool-ert) accompanied by the other information required by § 63.7(g)(2) in PDF format.

(2) Design evaluation. Beginning on the compliance dates specified in § 63.11494(i), the option to use a design evaluation to demonstrate compliance in § 63.985(b)(1)(i) does not apply. Instead, the owner or operator must comply with the performance test requirements in § 63.985(b)(1)(ii) and paragraph (f)(1) of this section.