Sample ID: 4-30-13 428/429 Line3 Run2 Lab ID:



### Value 0.7208 0.84 28.84 28.7628592 0.00711631 529.5 551 30.2 60 1.8 1 30.2 240 1.37 152.456 23.4 29.8 0.223 0.00027122962 3.655 37.007 Vd = Desired Velocity in stack for Isokinetic sampling 112.145



### Value
153.9586369 41.50123501 -2 -0.09414 25.4 1.19761 0.00711631 100.2315228 

### 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)



# 4/30/2013

Bws = Stack gas moisture content  p = Stack gas v elocity pressure (av g. 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)

 Hav g= 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 v elocity Total impinger catch (ml) Vwc (std) = conv erted water v olume Total silica gel catch (ml) Vwsg (std) = conv erted silica gel water v olume



### 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 collectedTest ID: 4-30-13 428/429 Line3 Run2 Lab ID: 0



## Value
153.9586369 Vm(std) Volume of Air Sampled by DGM (dscf) 3.655 Vr Velocity of Roof Vent Emissions During Test (ft/s) 102.05 Tr Average Temperature of Roof Vent During Test (°F) 30.2 Pbar Barometric Pressure During Test (in Hg) 8836.65 Area of Potroom Roof Vent (ft2) 122.5519333 Month Av erage Tons of Aluminum Produced per day (Line 3) 0.00711631 Bws Moisture in Roof Emissions 109466249 Qstd Flow of Roof Vent Emissions (dscf/hr) 

# Potroom Roof Vent Emission Calculations Line 3

**4/30/2013**

**Combined Method 5 Parameter and Analytical**

### Ep

### = 2[(C s2 

### Q sd

### ) / (PK)] Value Units

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

### = volumetric flow rate of roof vent effluent gas (dscf/hr) 109,466,249 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 V v = 

### volume of roof vent sample gas (dscf) 153.96 dscf Line 3 total volumetric flow rate (dscf/min) 3648875 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) 109,466,249 dscf/hr

528 = standard temperature (R) 528 R vv = average velocity of roof vent effluent gas (ft/hr) 13,158 ft/hr Pv = barometric pressure in the roof vent (in Hg) 30.2 in Hg A = area of potroom roof vent (ft2) 8,837 ft2 Md = mole fraction of dry gas 0.9929 Tv = roof vent temperature (°F) 102.05 °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 -April 30, 2013 Method 428/429 Run 2**