NR 440.43(2)(t)(t) “Silvery iron” means any ferrosilicon, as defined by ASTM A100-93 incorporated by reference in s. NR 440.17 (2) (a) 2., which contains less than 30% silicon.
NR 440.43(2)(u)(u) “Slag” means the more or less completely fused and vitrified matter separated during the reduction of a metal from its ore.
NR 440.43(2)(v)(v) “Standard ferromanganese” means that alloy as defined by ASTM A99-82 (reapproved 1987), incorporated by reference in s. NR 440.17 (2) (a) 1.
NR 440.43(2)(w)(w) “Tapping” means the removal of slag or product from the electric submerged arc furnace under normal operating conditions such as removal of metal under normal pressure and movement by gravity down the spout into the ladle.
NR 440.43(2)(x)(x) “Tapping period” means the time duration from initiation of the process of opening the tap hole until plugging of the tap hole is complete.
NR 440.43(2)(y)(y) “Tapping station” means that general area where molten product or slag is removed from the electric submerged arc furnace.
NR 440.43(3)(3)Standard for particulate matter.
NR 440.43(3)(a)(a) On and after the date on which the performance test required to be conducted by s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any electric submerged arc furnace any gases which:
NR 440.43(3)(a)1.1. Exit from a control device and contain particulate matter in excess of 0.45 kg/MW-hr (0.99 lb/MW-hr) while silicon metal, ferrosilicon, calcium silicon or silicomanganese zirconium is being produced.
NR 440.43(3)(a)2.2. Exit from a control device and contain particulate matter in excess of 0.23 kg/MW-hr (0.51 lb/MW-hr) while high-carbon ferrochrome, charge chrome, standard ferromanganese, silicomanganese, calcium carbide, ferrochrome silicon, ferromanganese silicon or silvery iron is being produced.
NR 440.43(3)(a)3.3. Exit from a control device and exhibit 15% opacity or greater.
NR 440.43(3)(a)4.4. Exit from an electric submerged arc furnace and escape the capture system and are visible without the aid of instruments. The requirements of this subdivision apply only during periods when flow rates are being established under sub. (6) (d).
NR 440.43(3)(a)5.5. Escape the capture system at the tapping station and are visible without the aid of instruments for more than 40% of each tapping period. There are no limitations on visible emissions under this subdivision when a blowing tap occurs. The requirements of this subdivision apply only during periods when flow rates are being established under sub. (6) (d).
NR 440.43(3)(b)(b) On and after the date on which the performance test required to be conducted by s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any dust-handling equipment any gases which exhibit 10% opacity or greater.
NR 440.43(4)(4)Standard for carbon monoxide.
NR 440.43(4)(a)(a) On and after the date on which the performance test required to be conducted by s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any electric submerged arc furnace any gases which contain, on a dry basis, 20 or greater volume % of carbon monoxide. Combustion of such gases under conditions acceptable to the department constitutes compliance with this subsection. Acceptable conditions include, but are not limited to, flaring of gases or use of gases as fuel for other processes.
NR 440.43(5)(5)Emission monitoring.
NR 440.43(5)(a)(a) The owner or operator subject to the provisions of this section shall install, calibrate, maintain and operate a continuous monitoring system for measurement of the opacity of emissions discharged into the atmosphere from control devices.
NR 440.43(5)(b)(b) For the purpose of reports required under s. NR 440.07 (3), the owner or operator shall report as excess emissions all 6-minute periods in which the average opacity is 15% or greater.
NR 440.43(5)(c)(c) The owner or operator subject to the provisions of this section shall submit a written report of any product change to the department. Reports of product changes shall be postmarked not later than 30 days after implementation of the product change.
NR 440.43(6)(6)Monitoring of operations.
NR 440.43(6)(a)(a) The owner or operator of any electric submerged arc furnace subject to the provisions of this section shall maintain daily records of the following information:
NR 440.43(6)(a)1.1. Product being produced.
NR 440.43(6)(a)2.2. Description of constituents of furnace charge, including the quantity, by weight.
NR 440.43(6)(a)3.3. Time and duration of each tapping period and the identification of material tapped (slag or product).
NR 440.43(6)(a)4.4. All furnace power input data obtained under par. (b).
NR 440.43(6)(a)5.5. All flow rate data obtained under par. (c) or all fan motor power consumption and pressure drop data obtained under par. (e).
NR 440.43(6)(b)(b) The owner or operator subject to the provisions of this section shall install, calibrate, maintain and operate a device to measure and continuously record the furnace power input. The furnace power input may be measured at the output or input side of the transformer. The device must have an accuracy of ±5% over its operating range.
NR 440.43(6)(c)(c) The owner or operator subject to the provisions of this section shall install, calibrate and maintain a monitoring device that continuously measures and records the volumetric flow rate through each separately ducted hood of the capture system, except as provided under par. (e). The owner or operator of an electric submerged arc furnace that is equipped with a water cooled cover which is designed to contain and prevent escape of the generated gas and particulate matter shall monitor only the volumetric flow rate through the capture system for control of emissions from the tapping station. The owner or operator may install monitoring devices in any appropriate location in the exhaust duct such that reproducible flow rate monitoring will result. The flow rate monitoring device shall have an accuracy of ±10% over its normal operating range and shall be calibrated according to the manufacturer’s instructions. The department may require the owner or operator to demonstrate the accuracy of the monitoring device relative to Methods 1 and 2 of 40 CFR part 60, Appendix A, incorporated by reference in s. NR 440.17.