Section 63.508 - Flare requirements(a) For any flare that is used to reduce organic HAP emissions from an EPPU, the owner or operator may elect to comply with the requirements in this section in lieu of the requirements of § 63.11(b) and the requirements referenced therein. The owner or operator may also elect to comply with the requirements in this section pursuant to the overlap provisions provided in § 63.481(k)(2) . However, beginning no later than the compliance dates specified in § 63.481(n) , the provisions specified in paragraphs (a)(1) through (32) of this section no longer apply. Instead, if an owner or operator reduces organic HAP emissions from an EPPU by venting emissions through a closed-vent system to a steam-assisted, air-assisted, or non-assisted flare, then the owner or operator must meet the applicable requirements for flares as specified in §§ 63.670 and 63.671 , including the provisions in tables 12 and 13 to subpart CC of this part, except as specified in paragraph (b) of this section. This requirement also applies to any flare using fuel gas from a fuel gas system, of which 50 percent or more of the fuel gas is derived from a EPPU, as determined on an annual average basis. For purposes of compliance with this paragraph, the following terms are defined in § 63.641 of subpart CC of this part: Assist air, assist steam, center steam, combustion zone, combustion zone gas, flare, flare purge gas, flare supplemental gas, flare sweep gas, flare vent gas, lower steam, net heating value, perimeter assist air, pilot gas, premix assist air, total steam, and upper steam.(1) §§ 63.487(a)(1)(i) and (b)(1)(i) ;(4) §§ 63.491(b)(3)(i) through (b)(3)(iii) ;(6) § 63.496(b)(7)(i)(A) ;(8) § 63.498(d)(5)(ii)(E) ;(10) §§ 63.504(c)(1) through (c)(3) ;(11) § 63.107(h)(9)(i) related to criteria in § 63.11(b) ;(14) §§ 63.116(a)(1) through (a)(3) ;(15) §§ 63.117(a)(5)(i) through (a)(5)(iii) ;(17) The last sentence in § 63.119(e)(1) ;(18) §§ 63.120(e)(1) through (e)(6) ;(19) §§ 63.122(c)(2) and (g)(3) ;(22) §§ 63.128(b)(1) through (b)(3) ;(23) §§ 63.129(a)(5)(i) through (a)(5)(iii) ;(24) §§ 63.130(a)(2)(i), (c), and (d)(5) ;(25) §§ 63.139(c)(3) and (d)(3) ;(26) §§ 63.145(j)(1) through (j)(3) ;(27) §§ 63.146(b)(7)(i)(A) through (b)(7)(i)(C) ;(30) §§ 63.180(e)(1) through (e)(3) ;(31) § 63.181(g)(1)(iii) ; and(32) The phrase "including periods when a flare pilot light system does not have a flame" in § 63.181(g)(2)(i) .(b) The exceptions specified in paragraphs (b) through (o) of § 63.108 apply, except as specified in paragraphs (b)(1) through (5) of this section. (1) Where the term "chemical manufacturing process unit" is used, the term "EPPU" applies instead for the purposes of this subpart.(2) Where the reference "§ 63.100(k)(10) " is used, the reference § 63.481(n) applies instead for the purposes of this subpart.(3) Where the phrase "Hazardous Organic Chemical Manufacturing" is used, the phrase "Polymers and Resins" applies instead for the purposes of this subpart.(4) Where the reference "§ 63.152(b)(7) of subpart G of this part" is used, the reference "§ 63.506(e)(5) (xiii)" applies instead for the purposes of this subpart.(5) Section 63.108(i) does not apply.