NR 440.18(5) (5) Flares used to comply with provisions of this section shall be operated at all times when emissions may be vented to them.

NR 440.18(6) (6) 

NR 440.18(6)(a) (a) Method 22 of Appendix A, 40 CFR part 60, incorporated by reference in s. NR 440.17 (1), shall be used to determine the compliance of flares with the visible emission provisions of this section. The observation period is 2 hours and shall be used according to Method 22.

NR 440.18(6)(b) (b) The presence of a flare pilot flame shall be monitored using a thermocouple or any other equivalent device to detect the presence of a flame.

NR 440.18(6)(c) (c) The net heating value of the gas being combusted in a flare shall be calculated using the following equation:

where:

HT is the net heating value of the sample, MJ/scm; where the net enthalpy per mole of offgas is based on combustion at 25°C and 700 mm Hg, but the standard temperature for determining the volume corresponding to one mole is 20°C;

K is the conversion constant, 1.740 × 10-7

where the standard temperature for (g-mole)/scm is 20°C;

Ci is the concentration of sample component i in ppm on a wet basis, as measured for organics by Method 18 in 40 CFR part 60, Appendix A, incorporated by reference in s. NR 440.17 (1), and measured for hydrogen and carbon monoxide by ASTM D1946-90, incorporated by reference in s. NR 440.17 (2) (a) 24.

Hi is the net heat of combustion of sample component i, kcal/(g-mole) at 25°C and 760 mm Hg. The heats of combustion may be determined using ASTM D2382-88 or D4809-95, incorporated by reference in s. NR 440.17 (2) (a) 30. and 61., if published values are not available or cannot be calculated.

NR 440.18(6)(d) (d) 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 as appropriate by Reference Method 2, 2A, 2C, or 2D of Appendix A, 40 CFR part 60, incorporated by reference in s. NR 440.17, by the unobstructed (free) cross sectional area of the flare tip.

NR 440.18(6)(e) (e) The maximum permitted velocity, Vmax, for flares complying with sub. (3) (d) 3. shall be determined by the following equation:

Log10 (Vmax) = (HT + 28.8)/31.7

where:

Vmax is the maximum permitted velocity, m/sec

28.8 = constant

31.7 = constant

HT is the net heating value as determined in par. (c)

NR 440.18(6)(f) (f) The maximum permitted velocity, Vmax , for air-assisted flares shall be determined by the following equation:

Vmax = 8.706 + 0.7084 (HT)

where:

Vmax is the maximum permitted velocity, m/sec

8.706 = constant

0.7084 = constant

HT is the net heating value as determined in par. (c)

NR 440.18 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90; am. (6) (a), (c), (e) and (f), Register, July, 1993, No. 451, eff. 8-1-93; am. (6) (c), Register, December, 1995, No. 480, eff. 1-1-96; CR 06-109: am. (6) (a) and (c) Register May 2008 No. 629, eff. 6-1-08.

NR 440.185 NR 440.185 General notification and reporting requirements.

NR 440.185(1) (1) For the purposes of this chapter, time periods specified in days shall be measured in calendar days, even if the word ‘calendar’ is absent, unless otherwise specified in an applicable requirement.