Storage Vessel Reference Control Technology

{
  "id": "MLC-T-ENV-026872",
  "term": "Storage Vessel Reference Control Technology",
  "field": "Environment",
  "definition": "1. Either:(1) For Group 1 storage vessels complying with § 63.660:(i) An internal floating roof, including an external floating roof converted to an internal floating roof, meeting the specifications of § .1063(a)(1)(i) and (b);(ii) An external floating roof meeting the specifications of 63.1063(a)(1)(ii), (a)(2), and (b); or (iv) A closed-vent system to a control device that reduces organic HAP emissions by 95 percent, or to an outlet concentration of 20 parts per million by volume (ppmv).(v) For purposes of emissions averaging, these four technologies are considered equivalent.(2) For all other storage vessels:(i) An internal floating roof meeting the specifications of § 63.119(b) of subpart G except for § 63.119(b)(5) and (6);(ii) An external floating roof meeting the specifications of § 63.119(c) of subpart G except for § 63.119(c)(2);(iii) An external floating roof converted to an internal floating roof meeting the specifications of § 63.119(d) of subpart G except for § 63.119(d)(2); or(iv) A closed-vent system to a control device that reduces organic HAP emissions by 95 percent, or to an outlet concentration of 20 parts per million by volume.(v) For purposes of emissions averaging, these four technologies are considered equivalent.\n\n2. (1) For Group 1 storage vessels complying with § 63.660: (i) An internal floating roof, including an external floating roof converted to an internal floating roof, meeting the (ii) An external floating roof meeting the specifications of § 63.1063(a)(1)(ii), (a)(2), and (b); or specifications of § 63.1063(a)(1)(i) and (b); (iii) [Reserved] (iv) A closed-vent system to a control device that reduces organic HAP emissions by 95 percent, or to an outlet concentrationof 20 parts per million by volume (ppmv). (v) For purposes of emissions averaging, these four technologies are considered equivalent. (2) For all other storage vessels: (i) An internal floating roof meeting the specifications of § 63.119(b) of subpart G except for § 63.119(b)(5) and (6);\n\n3. For Group 1 storage vessels complying with § 63.660: (i) An internal floating roof, including an external floating roof converted to an internal floating roof, meeting the specifications of §§ 63.1063(a)(1)(i), (a)(2), and (b) and 63.660(b)(2); (ii) An external floating roof meeting the specifications of §§ 63.1063(a)(1)(ii), (a)(2), and (b) and 63.660(b)(2); or (iii) [Reserved] (iv) A closed-vent system to a control device that reduces organic HAP emissions by 95 percent, or to an outlet concentration of 20 parts per million by volume (ppmv). (v) For purposes of emissions averaging, these four technologies are considered equivalent. (2) For all other storage vessels: (i) An internal floating roof meeting the specifications of § 63.119(b) of subpart G except for § 63.119(b)(5) and (6); (ii) An external floating roof meeting the specifications of § 63.119(c) of subpart G except for § 63.119(c)(2); (iii) An external floating roof converted to an internal floating roof meeting the specifications of § 63.119(d) of subpart G except for § 63.119(d)(2); or (iv) A closed-vent system to a control device that reduces organic HAP emissions by 95 percent, or to an outlet concentration of 20 parts per million by volume. (v) For purposes of emissions averaging, these four technologies are considered equivalent.\n\n4. internal floating roof meeting the specifications of § 63.119(b), an external floating roof meeting the specifications of § 63.119(c), an external floating roof converted to an internal floating roof meeting the specifications of § 63.119(d), or a closed-vent system to a control device achieving 95-percent reduction in organic HAP emissions. For purposes of emissions averaging, these four technologies are considered equivalent.",
  "references": [
    "40 CFR 63.641 (CFR 2016)",
    "Definition truncated. For full definition see 40 CFR 63.641 (CFR 2016)",
    "40 CFR 63.8665 (CFR 2020)",
    "40 CFR 63.101 (CFR 2024)"
  ],
  "url": "https://mlchart.com/terminology/environment/storage-vessel-reference-control-technology/"
}