§63.7765. What definitions apply to this subpart? — Inbound Citations

(iii) Method 9095A, “Paint Filter Liquids Test,” dated December 1996, IBR approved for §§ 63.7700(b) and 63.7765.

(g) For each cupola at a new or existing iron and steel foundry, you must reduce VOHAP emissions to the extent practicable during periods of off blast, as defined in § 63.7765, by meeting the applicable requirements in paragraph (g)(1) or (2) of this section.

(1) On and before March 9, 2021, you must comply with the requirements in § 63.7710 and the requirements specified in the startup, shutdown, and malfunction plan required at § 63.7720(c).

(2) After March 9, 2021, you must comply with the applicable requirements in paragraphs (g)(2)(i) through (iii) of this section.

(i) Except as provided in paragraphs (g)(2)(ii) and (iii) of this section, you must operate an afterburner or other thermal combustion control device with a flame present at all times while the cupola is off blast. This includes the latter portion of coke bed preparation step and the initial metallics charging step during cupola startup, the slag and residual metal removal step during cupola shutdown, and idling conditions when the blast air is turned off or down to the point that the cupola does not produce additional molten metal.

(ii) During cupola startup steps of refractory curing and cupola bed preparation and during the cupola shutdown steps of cupola cooling and banking or bottom drop, you must comply with the requirements in § 63.7710 and the opacity limit in § 63.7690(a)(7).

(iii) You must light the cupola afterburner or other thermal combustion control device as soon as practicable during the cupola startup step of coke bed preparation following the procedures included in the operation and maintenance plan required at § 63.7710(b), but no later than 30 minutes after the blast air is started to begin the coke bed burn-in.