Sample ID: 5-1-13 428/429 Line3 Run3 Lab ID:

Value

0.7061

0.84

28.84

28.76759817

0.006679135

530.2

553.8

30.3

60

1.8

1

30.3

240

1.31

150.462

21.7

29.75

0.223

0.00027122962

4.122

41.735 Vd = Desired Velocity in stack for Isokinetic sampling

97.732

Value

152.2230778

40.78890094

-5

-0.23535

26.7

1.258905

0.006679135

101.4702591

Method 5 Parameter

 Potroom Roof Vent Emission Calculations Line 3

Pm = Pressure at orifice meter (in. Hg)

Vm = Total sample volume from dry gas meter (dcf)

Total sampling time required for test (min)*

Tm = Absolute average dry gas meter temp (R).

Ts = Stack gas absolute average temperature (R)

5/1/2013

Bws = Stack gas moisture content

p = Stack gas velocity pressure (avg. sqrt p - in. water)

Cp = Pitot tube calibration coefficient

Ta = Sampling site ambient temperature, (°F)

H@ = Orifice meter calibration factor, (in. water)

Y = Dry gas meter calibration factor

Pbar = Barometric pressure, (in. Hg)

Havg = average orifice meter differential

Bws = fraction of gas that is moisture

I = % Isokinetic variation

Vm (std) = Volume of sample measured by DGM (dscf) 

Vs = Average stack gas velocity

Total impinger catch (ml)

Vwc (std) = converted water volume 

Total silica gel catch (ml)

Vwsg (std) = converted silica gel water volume 

Air Test Calculations

Ratio of Vs/Vd*100 (Must be less than 120%)

Md = Stack gas dry molecular weight, (lb/lb-mole)

Ms = Stack gas (wet) molecular weight (lb/lb-mole)

Vr = Average Anemometer Velocity during test.

Ps = Absolute stack gas pressure (in Hg)

Nozzle diameter (in)

Area of Nozzle (ft^2)

Vlc Volume collected
Test ID: 5-1-13 428/429 Line3 Run3 Lab ID: 0

Value

152.2230778 Vm(std) Volume of Air Sampled by DGM (dscf)

4.122 Vr Velocity of Roof Vent Emissions During Test (ft/s)

100.34 Tr Average Temperature of Roof Vent During Test (°F)

30.3 Pbar Barometric Pressure During Test (in Hg)

8836.65 Area of Potroom Roof Vent (ft2)

122.5519333 Month Average Tons of Aluminum Produced per day (Line 3)

0.006679135 Bws Moisture in Roof Emissions

124294249.4 Qstd Flow of Roof Vent Emissions (dscf/hr)

 Potroom Roof Vent Emission Calculations Line 3

5/1/2013

Combined Method 5 Parameter and Analytical

Ep

 = 2[(Cs2Qsd) / (PK)]

Value Units

2 = conversion factor to account for two potrooms per potline 2

Qsd = volumetric flow rate of roof vent effluent gas (dscf/hr) 124,294,249 dscf/hr

P = potline III aluminum production rate (ton/hr) 5.11 ton/hr

K = conversion factor (453,600 mg/lb) 453,600 mg/lb

Vv = volume of roof vent sample gas (dscf) 152.22 dscf

Line 3 total volumetric flow rate (dscf/min) 4143142 dscf/min

Volumetric Flow Rate of Roof Vent Effluent Gas

Qsd = 3600 (1-Bws) Vv As (528/Ts) (Ps/29.92)

Value Units

where Qsd = volumetric flow rate of roof vent effluent gas (dscf/hr) 124,294,249 dscf/hr

528 = standard temperature (R) 528 R

vv = average velocity of roof vent effluent gas (ft/hr) 14,839 ft/hr

Pv = barometric pressure in the roof vent (in Hg) 30.3 in Hg

A = area of potroom roof vent (ft2) 8,837 ft2

Md = mole fraction of dry gas 0.9933

Tv = roof vent temperature (°F) 100.34 °F

460 = conversion factor (°F toR) 460 R

29.92 = standard pressure (in Hg) 29.92 in Hg

40 CFR Part 63 Subpart LL - NESHAP for Primary Aluminum Reduction Plants

§ 63.847(d)(1) - Roof Vent Emissions from Potlines

Roof Vent Emission Rate of Potline III - May 1, 2013 Method 428/429 Run 3