§ 60.271 - Definitions.

§ 60.271 Definitions.

As used in this subpart, all terms not defined herein shall have the meaning given them in the Act and in subpart A of this part.

(a) Electric arc furnace (EAF) means a furnace that produces molten steel and heats the charge materials with electric arcs from electricity using carbon electrodes. Furnaces that continuously feed direct-reduced iron ore pellets as the primary source of iron are not affected facilities within the scope of this definition.

(b) Dust-handling equipment means any equipment used to handle particulate matter collected by the control device and located at or near the control device for an EAF subject to this subpart.

(c) Control device means the air pollution control equipment used to remove particulate matter generated by an EAF(s) from the effluent gas stream.

(d) Capture system means the equipment (including ducts, hoods, fans, dampers, etc.) used to capture or transport particulate matter generated by the operation of an EAF and transport captured particulate matter to the air pollution control device.

(e) Charge means the addition of iron and steel scrap or other materials into the top shell of an electric arc furnace.

(f) Charging period means the time period commencing at the moment an EAF starts to open and ending either three minutes after the EAF roof is returned to its closed position or six minutes after commencement of opening of the roof, whichever is longerwhen iron and steel scrap or other materials are added into the top of an EAF until the melting and refining period commences.

(g) Tap means the pouring of molten steel from an EAF.

(h) Tapping period means the time period commencing at the moment an EAF begins to pour molten steel and ending either three minutes after steel ceases to flow from an EAF, or six minutes after steel begins to flow, whichever is longer.

(i) Meltdown Melting and refining means that phase of the steel production cycle when charge material is melted and undesirable elements are removed from the metal.

(j) Meltdown Melting and refining period means the time period commencing at the termination initial energizing of the initial charging period electrode to begin the melting process and ending at the initiation of the tapping period, excluding any intermediate charging periods and times when power to the EAF is offthe electrodes are not energized as part of the melting process.

(k) Shop opacity means the arithmetic average of 24 or more opacity observations of any EAF emissions emanating from, and not within, the shop, taken in accordance with EPA Method 9 of appendix A of this part for the applicable time periods.

(

. Alternatively, ASTM D7520–16 (incorporated by reference, see § 60.17), may be used with the following five conditions:

(1) During the digital camera opacity technique (DCOT) certification procedure outlined in Section 9.2 of ASTM D7520–16 (incorporated by reference, see § 60.17), the owner or operator or the DCOT vendor must present the plumes in front of various backgrounds of color and contrast representing conditions anticipated during field use such as blue sky, trees, and mixed backgrounds (clouds and/or a sparse tree stand);

(2) The owner or operator must also have standard operating procedures in place including daily or other frequency quality checks to ensure the equipment is within manufacturing specifications as outlined in Section 8.1 of ASTM D7520–16 (incorporated by reference, see § 60.17);

(3) The owner or operator must follow the recordkeeping procedures outlined in § 60.7(f) for the DCOT certification, compliance report, data sheets, and all raw unaltered JPEGs used for opacity and certification determination;

(4) The owner or operator or the DCOT vendor must have a minimum of four independent technology users apply the software to determine the visible opacity of the 300 certification plumes. For each set of 25 plumes, the user may not exceed 15 percent opacity of anyone reading and the average error must not exceed 7.5 percent opacity;

(5) Use of this approved alternative does not provide or imply a certification or validation of any vendor's hardware or software. The onus to maintain and verify the certification and/or training of the DCOT camera, software, and operator in accordance with ASTM D7520–16 (incorporated by reference, see § 60.17) and these requirements is on the facility, DCOT operator, and DCOT vendor.

(l) Heat time means the period commencing when scrap is charged to an empty EAF and terminating when the EAF tap is completed.

(m) Shop means the building which that houses one or more EAF's and serves as the point from which compliance with § 60.272(a)(3), “Standard for Particulate Matter,” is measured.

(n) Direct shell evacuation system means any system that creates and maintains a negative pressure within the EAF above the slag or metal and ducts these shell during melting and refining, and transports emissions to the control device.

(o) Bag leak detection system means a system that is capable of continuously monitoring relative particulate matter (dust) loadings in the exhaust of a baghouse to detect bag leaks and other conditions that result in increases in particulate loadings. A bag leak detection system includes, but is not limited to, an instrument that operates on triboelectric, electrodynamic, light scattering, light transmittance, or other effect to continuously monitor relative particulate matter loadings.

(p) Damper means any device used to open, close or throttle a DEC system or hood designed to capture emissions from an EAF and route them to the associated control device(s). It does not include isolation dampers used to isolate a fan or baghouse compartment for repair or cleaning, or dampers controlling collection of emissions from equipment other than an EAF.

(q) Negative-pressure fabric filter means a fabric filter with the fans on the downstream side of the filter bags.

(r) Positive-pressure fabric filter means a fabric filter with the fans on the upstream side of the filter bags.

[40 FR 43852, Sept. 23, 1975, as amended at 49 FR 43843, Oct. 31, 1984; 64 FR 10109, Mar. 2, 1999; 70 FR 8530, Feb. 22, 2005; 88 FR 58475, Aug. 25, 2023]