NR 661.1032 HistoryHistory: CR 19-082: cr. Register August 2020 No. 776, eff. 9-1-20.
NR 661.1033NR 661.1033Standards: closed-vent systems and control devices.
NR 661.1033(1)(1)A remanufacturer or other person that stores or treats hazardous secondary material in hazardous secondary material management units using closed-vent systems and control devices used to comply with provisions of this part shall comply with the provisions of this section.
NR 661.1033(2)(2)A control device involving vapor recovery, such as a condenser or adsorber, shall be designed and operated to recover the organic vapors vented to it with an efficiency of 95 weight percent or greater unless the total organic emission limits specified in s. NR 661.1032 (1) (a) for all affected process vents can be attained at an efficiency less than 95 weight percent.
NR 661.1033(3)(3)An enclosed combustion device, such as a vapor incinerator, boiler, or process heater, shall be designed and operated to reduce the organic emissions vented to it by 95 weight percent or greater; to achieve a total organic compound concentration of 20 ppmv, expressed as the sum of the actual compounds, not carbon equivalents, on a dry basis corrected to 3 percent oxygen; or to provide a minimum residence time of 0.50 seconds at a minimum temperature of 760°C. If a boiler or process heater is used as the control device, the vent stream shall be introduced into the flame zone of the boiler or process heater.
NR 661.1033(4)(4)
NR 661.1033(4)(a)(a) A flare shall be designed for and operated with no visible emissions as determined by the methods specified in sub. (5) (a), except for periods not to exceed a total of 5 minutes during any 2 consecutive hours.
NR 661.1033(4)(b)(b) A flare shall be operated with a flame present at all times, as determined by the methods specified in sub. (6) (b) 3.
NR 661.1033(4)(c)(c) A flare shall be used only if the net heating value of the gas being combusted is 11.2 MJ/scm or greater if the flare is steam-assisted or air-assisted; or if the net heating value of the gas being combusted is 7.45 MJ/scm or greater if the flare is non-assisted. The net heating value of the gas being combusted shall be determined by the methods specified in sub. (5) (b).
NR 661.1033 NoteNote: 1 megajoule/meter3 [MJ/m3] = 26.8391919932 Btu (IT)/foot3 [Btu/ft3].
NR 661.1033(4)(d)(d)
NR 661.1033(4)(d)1.1. Except as provided in subs. (4) (d) 2. and 3., a steam-assisted or nonassisted flare shall be designed for and operated with an exit velocity, as determined by the methods specified in sub. (5) (c), less than 18.3 m/s.
NR 661.1033(4)(d)2.2. A steam-assisted or nonassisted flare designed for and operated with an exit velocity, as determined by the methods specified in sub. (5) (c), equal to or greater than 18.3 m/s but less than 122 m/s is allowed if the net heating value of the gas being combusted is greater than 37.3 MJ/scm.
NR 661.1033(4)(d)3.3. A steam-assisted or nonassisted flare designed for and operated with an exit velocity, as determined by the methods specified in sub. (5) (c), less than the velocity, Vmax, as determined by the method specified in sub. (5) (d) and less than 122 m/s is allowed.
NR 661.1033(4)(e)(e) An air-assisted flare shall be designed and operated with an exit velocity less than the velocity, Vmax, as determined by the method specified in sub. (5) (e).
NR 661.1033(4)(f)(f) A flare used to comply with this section shall be steam-assisted, air-assisted, or nonassisted.
NR 661.1033(5)(5)
NR 661.1033(5)(a)(a) Reference Method 22 in 40 CFR part 60, incorporated by reference in s. NR 660.11, shall be used to determine the compliance of a flare with the visible emission provisions of this subchapter. The observation period is 2 hours and shall be used according to Method 22.
NR 661.1033(5)(b)(b) The net heating value of the gas being combusted in a flare shall be calculated using the following equation:
Where:
H= Net heating value of the sample, MJ/scm; where the net enthalpy per mole of offgas is based on combustion at 25°C and 760 mm Hg, but the standard temperature for determining the volume corresponding to 1 mol is 20°C.
K = Constant, 1.74 x 10-(1/ppm) (g mol/scm) (MJ/kcal) where standard temperature for (g mol/scm) is 20°C.
C= Concentration of sample component i in ppm on a wet basis, as measured for organics by Reference Method 18 in chapter 60 and measured for hydrogen and carbon monoxide by ASTM D 1946-82, incorporated by reference in s. NR 660.11.
H= Net heat of combustion of sample component i, kcal/9 mol at 25°C and 760 mm Hg. The heats of combustion may be determined using ASTM D 2382-83, incorporated by reference in s. NR 660.11, if published values are not available or cannot be calculated.
NR 661.1033(5)(c)(c) The actual exit velocity of a flare shall be determined by dividing the volumetric flow rate, in units of standard temperature and pressure, as determined by Reference Methods 2, 2A, 2C or 2D in appendix A of 40 CFR part 60, incorporated by reference in s. NR 660.11, as appropriate, by the unobstructed, free, cross-sectional area of the flare tip.
NR 661.1033(5)(d)(d) The maximum allowed velocity in m/s, Vmax, for a flare complying with sub. (4) (d) 3. shall be determined by the following equation:
Where: