Sample ID: 4-30-13 0061 Line1 Run1 Lab ID:



### Value 0.7407 0.84 28.84 28.76267064 0.007133705 536.4 542.5 30.2 60 1.67 1.005 30.2 240 1.46 164.263 25.1 29.63 0.225 0.00027611654 3.972 40.216 Vd = Desired Velocity in stack for Isokinetic sampling 105.524



### Value
164.6028622 42.43814469 10 0.4707 15.1 0.711965 0.007133705 101.9365366 

### Method 5 Parameter 

# Potroom Roof Vent Emission Calculations Line 1

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 0061 Line1 Run1 Lab ID: 0



## Value
164.6028622 Vm(std) Volume of Air Sampled by DGM (dscf) 3.972 Vr Velocity of Roof Vent Emissions During Test (ft/s) 101.64 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) 122.8908333 Month Av erage Tons of Aluminum Produced per day (Line 3) 0.007133705 Bws Moisture in Roof Emissions 119045068.2 Qstd Flow of Roof Vent Emissions (dscf/hr) 

# Potroom Roof Vent Emission Calculations Line 1

**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) 119,045,068 dscf/hr P = potline III aluminum production rate (ton/hr) 5.12 ton/hr K = conversion factor (453,600 mg/lb) 453,600 mg/lb V v = 

### volume of roof vent sample gas (dscf) 164.60 dscf Line 1 total volumetric flow rate (dscf/min) 3968169 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) 119,045,068 dscf/hr

528 = standard temperature (R) 528 R vv = average velocity of roof vent effluent gas (ft/hr) 14,299 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) 101.64 °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 I -April 30, 2013 Method 0061 Run 1**