§ 63.1253 Standards: Storage tanks.
(a) Except as provided in paragraphs (d), (e), and (f) of this section, the owner or operator of a storage tank meeting the criteria of paragraph (a)(1) of this section is subject to the requirements of paragraph (b) of this section. Except as provided in paragraphs (d), (e), and (f) of this section, the owner or operator of a storage tank meeting the criteria of paragraph (a)(2) of this section is subject to the requirements of paragraph (c) of this section. Compliance with the provisions of paragraphs (b) and (c) of this section is demonstrated using the initial compliance procedures in § 63.1257(c) and the monitoring requirements in § 63.1258.
(1) A storage tank with a design capacity greater than or equal to 38 m but less than 75 m storing a liquid for which the maximum true vapor pressure of total HAP is greater than or equal to 13.1 kPa.
(2) A storage tank with a design capacity greater than or equal to 75 m storing a liquid for which the maximum true vapor pressure of total HAP is greater than or equal to 13.1 kPa.
(b) The owner or operator of a storage tank shall equip the affected storage tank with either a fixed roof with internal floating roof, an external floating roof, an external floating roof converted to an internal floating roof, or a closed-vent system meeting the conditions of § 63.1252(b) with a control device that meets any of the following conditions:
(1) Reduces inlet emissions of total HAP by 90 percent by weight or greater;
(2) Reduces emissions to outlet concentrations less than or equal to 20 ppmv as TOC and less than or equal to 20 ppmv as hydrogen halides and halogens;
(3) Is an enclosed combustion device that provides a minimum residence time of 0.5 seconds at a minimum temperature of 760 °C;
(4) Is a flare that meets the requirements of § 63.11(b); or