NR 463.21(1)(1) What is the purpose of this subchapter? This subchapter establishes national emission standards for hazardous air pollutants (NESHAP) for iron and steel foundries. This subchapter also establishes requirements to demonstrate initial and continuous compliance with the emissions limitations, work practice standards and operation and maintenance requirements in this subchapter.

NR 463.21(2)(2) Am I subject to this subchapter? You are subject to this subchapter if you own or operate an iron and steel foundry that is, or is part of, a major source of hazardous air pollutant (HAP) emissions. Your iron and steel foundry is a major source of HAP for purposes of this subchapter if it emits or has the potential to emit any single HAP at a rate of 10 tons or more per year or any combination of HAP at a rate of 25 tons or more per year or if it is located at a facility that emits or has the potential to emit any single HAP at a rate of 10 tons or more per year or any combination of HAP at a rate of 25 tons or more per year.

NR 463.21(3)(3) What parts of my foundry does this subchapter cover?

NR 463.21(3)(b)(b) This subchapter covers emissions from metal melting furnaces, scrap pre-heaters, pouring areas, pouring stations, automated conveyor and pallet cooling lines, automated shakeout lines and mold and core making lines. This subchapter also covers fugitive emissions from foundry operations.

NR 463.21(3)(c)(c) An affected source is existing if you commenced construction or reconstruction of the affected source before December 23, 2002.

NR 463.21(3)(d)(d) An affected source is new if you commenced construction or reconstruction of the affected source on or after December 23, 2002. An affected source is reconstructed if it meets the definition of “reconstruction’’ in s. NR 463.22.

NR 463.21(4)(4) When do I have to comply with this subchapter?

NR 463.21(4)(a)(a) Except as specified in par. (b), if you have an existing affected source, you shall comply with each emissions limitation, work practice standard and operation and maintenance requirement in this subchapter that applies to you no later than April 23, 2007. Major source status for existing affected sources shall be determined no later than April 23, 2007.

NR 463.21(4)(b)(b) If you have an existing affected source, you shall comply with the work practice standards in s. NR 463.23 (2) (b) or (c), as applicable, no later than April 22, 2005.

NR 463.21(4)(c)(c) If you have a new affected source for which the initial startup date is on or before April 22, 2004, you shall comply with each emissions limitation, work practice standard and operation and maintenance requirement in this subchapter that applies to you by April 22, 2004.

NR 463.21(4)(d)(d) If you have a new affected source for which the initial startup date is after April 22, 2004, you shall comply with each emissions limitation, work practice standard and operation and maintenance requirement in this subchapter that applies to you upon initial startup.

NR 463.21(4)(e)(e) If your iron and steel foundry is an area source that becomes a major source of HAP, you shall meet the requirements of s. NR 460.05 (3) (c).

NR 463.22NR 463.22 What definitions apply to this subchapter? For terms not defined in this section, the definitions contained in chs. NR 400 and 460 apply to the terms in this subchapter, with definitions in ch. NR 460 taking precedence over definitions in ch. NR 400. If this section defines a term which is also defined in ch. NR 400 or 460, the definition in this section applies in this subchapter. In this subchapter:

NR 463.22(1)(1) “Automated conveyor and pallet cooling line” means any dedicated conveyor line or area used for cooling molds received from pouring stations.

NR 463.22(2)(2) “Automated shakeout line” means any mechanical process unit designed for and dedicated to separating a casting from a mold. These mechanical processes include shaker decks, rotary separators and high-frequency vibration units. Automated shakeout lines do not include manual processes for separating a casting from a mold, such as personnel using a hammer, chisel, pick ax, sledge hammer or jackhammer.

NR 463.22(3)(3) “Bag leak detection system” means a system that is capable of continuously monitoring relative particulate matter loadings in the exhaust of a baghouse to detect bag leaks and other upset conditions. A bag leak detection system includes an instrument that operates on triboelectric, electrodynamic, light scattering, light transmittance or other effect to continuously monitor relative particulate matter loadings.

NR 463.22(4)(4) “Binder chemical” means a component of a system of chemicals used to bind sand together into molds, mold sections and cores through chemical reaction as opposed to pressure.

NR 463.22(5)(5) “Capture system” means the collection of components used to capture gases and fumes released from one or more emissions points and then convey the captured gas stream to a control device or to the atmosphere. A capture system may include the following components as applicable to a given capture system design: duct intake devices, hoods, enclosures, ductwork, dampers, manifolds, plenums and fans.

NR 463.22(6)(6) “Cold box mold or core making line” means a mold or core making line in which the formed aggregate is hardened by catalysis with a gas.

NR 463.22(7)(7) “Combustion device” means an afterburner, thermal incinerator or scrap preheater.

NR 463.22(8)(8) “Conveyance” means the system of equipment that is designed to capture pollutants at the source, convey them through ductwork and exhaust them using forced ventilation. A conveyance may include control equipment designed to reduce emissions of the pollutants. Emissions that are released through windows, vents or other general building ventilation or exhaust systems are not considered to be discharged through a conveyance.

NR 463.22(9)(9) “Cooling” means the process of molten metal solidification within the mold and subsequent temperature reduction prior to shakeout.

NR 463.22(10)(10) “Cupola” means a vertical cylindrical shaft furnace that uses coke and forms of iron and steel such as scrap and foundry returns as the primary charge components and melts the iron and steel through combustion of the coke by a forced upward flow of heated air.