Hj is the net heat of combustion of compound j, kcal/g-mole (kcal/lb-mole), based on combustion at 25°C and 760 mm Hg (77°F and 30 in Hg)

NR 440.647(6)(f)1. 1. Method 18 shall be used to determine the concentration of each individual organic component (Cj) in the gas stream. Method 1 or 1A, as appropriate, shall be used to determine the sampling site to the inlet of the flare. Using this same sample, ASTM D1946-90 (reapproved 1994), incorporated by reference in s. NR 440.17 (2) (a) 24., shall be used to determine the hydrogen and carbon monoxide content.

NR 440.647(6)(f)2. 2. The sampling time for each run shall be 1 hour in which either an integrated sample or 4 grab samples shall be taken. If grab sampling is used, then the samples shall be taken at 15 minute intervals.

NR 440.647(6)(f)3. 3. Published or calculated values shall be used for the net heats of combustion of the sample components. If values are not published or cannot be calculated, ASTM D2382-88 or D4809-95, incorporated by reference in s. NR 440.17 (2) (a) 30. and 61., may be used to determine the net heat of combustion of component “j”.

NR 440.647(6)(g) (g) The owner or operator shall determine compliance with the exit velocity provisions in s. NR 440.18 as referenced by sub. (3) (a) 1. a. 3) as follows:

NR 440.647(6)(g)1. 1. If applicable, the net heating value (HT) of the process vent shall be determined according to the procedures in par. (f) to determine the applicable velocity requirements.

NR 440.647(6)(g)2. 2. If applicable, the maximum permitted velocity (Vmax) for steam-assisted and nonassisted flares shall be computed using the following equation:

where:

Vmax is the maximum permitted velocity, m/sec (ft/sec)

K4 is 28.8 for metric units and 1212 for English units

K5 is 31.7 for metric units and 850.8 for English units

HT is the net heating value as determined in par. (f), MJ/scm (Btu/scf)

NR 440.647(6)(g)3. 3. The maximum permitted velocity, Vmax, for air-assisted flares shall be determined by the following equation:

+

=

where:

Vmax is the maximum permitted velocity, m/sec (ft/sec)

K6 is 8.706 m/sec for metric units and 28.56 ft/sec for English units

K7 is 0.7084 [(m/sec)/(MJ/scm)] for metric units and 0.00245 [(ft/sec)/(Btu/scf)] for English units

HT is the net heating value as determined in par. (f), MJ/scm (Btu/scf)

NR 440.647(6)(g)4. 4. 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 Method 2, 2A, 2C or 2D as appropriate, by the unobstructed (free) cross sectional area of the flare tip.

NR 440.647(6)(h) (h) The owner or operator shall determine compliance with the mass emission per mass product standards in sub. (1) (d) and (e) and in sub. (3) (b) 1. a., (c) 1. a. 1), b. 1), 2. a. and b. 1).

NR 440.647(6)(h)1. 1. The emission rate of TOC shall be computed using the following equation:

=

where:

ERTOC is the emission rate of total organic compounds, minus methane and ethane, kg TOC/Mg product (lb TOC/ton)

ETOC is the emission rate of total organic compounds, minus methane and ethane, in the sample, kg/hr (lb/hr)

Pp is the rate of polymer production, kg/hr (lb/hr)

K5 is 1,000 kg/Mg for metric units and 2,000 lb/ton for English units