Fugitive Emission Study Rev0
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Fugitive Emissions StudySheet: 1 of 8
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Reference Documents# Drawing No. Title Sheet Rev1 PF020137 Process & Instrumentation Diagram 1 32 SF020137-22 Service Flow - L5790 GL Fuel & Start Gas System 1 23 SF020137-72 Service Flow - Building Heaters (Catadyne) 1 345 SF020137-70 Building Equipment 1 367 8000347 AGAT Laboratories Gas Analysis 1 May 5/1089
1011121314
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Building Data# Variable Qty Units
Average Temperature1 Building Interior (27 °C) 80 °F
2 Building Exterior (17 °C) 63 °FExterior Dimensions
3 Length (L) 32.20 Ft.4 Width (W) 10.80 Ft.
5 10.70 Ft.
6 12.48 Ft.Walls
7 Wall Thickness (Total) 3 In.Roof
8 Style Gable
9 Slope (4:12 = 0.33)* 4:12Ventilation Source Heights
Low Source 1.67 Ft.
High Source 15.63 Ft.
10 Ventilation Style Low Vent - Ridge Vent
Design Parameters# Variable Qty Units1 Area
2 326.51
Volume
3 3493.66
4 290.59
5 3784.25
Low Eave Height (HL)
High Eave Height (HH)
AFLOOR Ft.2
VMAIN Ft.3
VROOF Ft.3
VTOTAL Ft.3
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API 4332 Group DescriptionsGroup: Definition:
Group 1 C1 (Methane, Methane/Air)Group 2 C2 - C4 (Ethane, Propane, Butane, Mixtures)Group 3 Gas (Incoming from field prior to fractionation)Group 4 C5+ and Light Mixtures Group 5 C6+ and Heavier Mixtures
Group 6 Water+ (Water and Gas/Condensate/Glycol/etc.)
Stream 1 Predicted Emission Rates"Stream 1 Name"
ComponentGroup 1 Group 2 Group 3 Group 4 Group 5
Qty Factor Ext. Qty Factor Ext. Qty Factor Ext. Qty Factor Ext. Qty Factor Ext.
Gate Valve 1.72 0 0.684 0 0.492 0 0.347 0 0.0282 0
Multidirectional Valve 1.08 0 0.383 0 0.464 0 0.259 0 0.0437 0
Ball Valve 39 0.0708 2.76 0.0303 0 0.0158 0 0.0123 0 0.000755 0
Plug Valve 2.05 0 0.875 0 0.481 0 0.364 0 0.0247 0
Globe Valve 2 2.75 5.50 1.08 0 0.913 0 0.603 0 0.059 0
Needle Valve 5 0.117 0.59 0.0499 0 0.0248 0 0.0189 0 0.00117 0
Check Valve 10 0.0267 0.27 0.0115 0 0.00539 0 0.00431 0 0.00026 0
Butterfly Valve 2.77 0 1.11 0 0.804 0 0.539 0 0.0428 0
Relief Valve 1 0.423 0.42 0.195 0 0.0866 0 0.0697 0 0.00415 0
Flange Connection 74 0.0915 6.77 0.0204 0 0.0227 0 0.0497 0 0.000111 0
Ring Flange Connection 0.00198 0 0.000441 0 0.000478 0 0.00104 0 2.13E-06 0
Threaded Connection 108 0.0712 7.69 0.0157 0 0.0182 0 0.0388 0 8.34E-05 0
Gasket Connection 0.00591 0 0.0013 0 0.00146 0 0.00312 0 6.49E-06 0
Union Connection 3 0.45 1.35 0.0991 0 0.12 0 0.249 0 0.00057 0
Tubing Connection 3 0.0362 0.11 0.00798 0 0.00993 0 0.0201 0 4.55E-05 0
O-Ring Connection 0.989 0 0.217 0 0.427 0 0.66 0 0.00325 0
Sight Glass 1 0 0.00 7.17E-06 0 0 0 0.00851 0 0 0
Thief Hatch 0.426 0 0.425 0 0.213 0 0 0 0 0
Flat Faced Hatch 0.122 0 0.0533 0 0.000222 0 0 0 0 0
Recip. Rod Seal 4.64 0 1.95 0 1.11 0 0.00651 0 0.00296 0
Rotating Shaft Seal 2.87 0 1.49 0 1.14 0 0.337 0 0.128 0
Misc. Packing 4.88 0 1.51 0 0.569 0 0.00203 0 0.000928 0
Valve Operator Diaph. 0.978 0 0.113 0 2.19 0 0 0 0 0
Diff. Pressure Diaph. 0.339 0 0.0394 0 0.745 0 0 0 0 0
TOTAL (lb/day) 25.46 0.00 0.00 0.00 0.00* Predicted Emission Rates are taken from Table E-3 of API 4332 Fugitive Hydrocarbon Emissions from Petroleum Producing Operations
"Stream 1 Name"Group 6 Combined Total
Qty Factor Ext. Emissions
9.91E-06 0 0.0000
0.000016 0 0.0000
2.64E-07 0 2.7612
8.37E-06 0 0.0000
2.126E-05 0 5.5000
3.95E-07 0 0.5850
9.07E-08 0 0.2670
0.000015 0 0.0000
1.45E-06 0 0.4230
0 0 6.7710
0 0 0.0000
0 0 7.6896
0 0 0.0000
0 0 1.3500
0 0 0.1086
0 0 0.0000
0 0 0.0000
0 0 0.0000
0 0 0.0000
0 0 0.0000
0 0 0.0000
0 0 0.0000
0 0 0.0000
0 0 0.0000
0.00 25.46* Predicted Emission Rates are taken from Table E-3 of API 4332 Fugitive Hydrocarbon Emissions from Petroleum Producing Operations
Fugitive Emissions Study
Client: Rev Description0 0 Issued for Final Report
Stream 2 Predicted Emission Rates"Stream 2 Name"
ComponentGroup 1 Group 2
Qty Factor Ext. Qty Factor Ext.Gate Valve 1.72 0 0.684 0Multidirectional Valve 1.08 0 0.383 0Ball Valve 0.0708 0 0.0303 0Plug Valve 2.05 0 0.875 0Globe Valve 2.75 0 1.08 0Needle Valve 0.117 0 0.0499 0Check Valve 0.0267 0 0.0115 0Butterfly Valve 2.77 0 1.11 0Relief Valve 0.423 0 0.195 0Flange Connection 0.0915 0 0.0204 0Ring Flange Connection 0.00198 0 0.000441 0Threaded Connection 0.0712 0 0.0157 0Gasket Connection 0.00591 0 0.0013 0Union Connection 0.45 0 0.0991 0Tubing Connection 0.0362 0 0.00798 0O-Ring Connection 0.989 0 0.217 0Sight Glass 0 0 7.17E-06 0Thief Hatch 0.426 0 0.425 0Flat Faced Hatch 0.122 0 0.0533 0Recip. Rod Seal 4.64 0 1.95 0Rotating Shaft Seal 2.87 0 1.49 0Misc. Packing 4.88 0 1.51 0Valve Operator Diaph. 0.978 0 0.113 0
Diff. Pressure Diaph. 0.339 0 0.0394 0
TOTAL (lb/day) 0.00 0.00* Predicted Emission Rates are taken from Table E-3 of API 4332 Fugitive Hydrocarbon Emissions from Petroleum Producing Operations
Stream 3 Predicted Emission Rates"Stream 3 Name"
ComponentGroup 1 Group 2
Qty Factor Ext. Qty Factor Ext.Gate Valve 1.72 0 0.684 0Multidirectional Valve 1.08 0 0.383 0Ball Valve 0.0708 0 0.0303 0Plug Valve 2.05 0 0.875 0Globe Valve 2.75 0 1.08 0Needle Valve 0.117 0 0.0499 0Check Valve 0.0267 0 0.0115 0Butterfly Valve 2.77 0 1.11 0Relief Valve 0.423 0 0.195 0
Flange Connection 0.0915 0 0.0204 0Ring Flange Connection 0.00198 0 0.000441 0Threaded Connection 0.0712 0 0.0157 0Gasket Connection 0.00591 0 0.0013 0Union Connection 0.45 0 0.0991 0Tubing Connection 0.0362 0 0.00798 0O-Ring Connection 0.989 0 0.217 0Sight Glass 0 0 7.17E-06 0Thief Hatch 0.426 0 0.425 0Flat Faced Hatch 0.122 0 0.0533 0Recip. Rod Seal 4.64 0 1.95 0Rotating Shaft Seal 2.87 0 1.49 0Misc. Packing 4.88 0 1.51 0Valve Operator Diaph. 0.978 0 0.113 0
Diff. Pressure Diaph. 0.339 0 0.0394 0
TOTAL (lb/day) 0.00 0.00* Predicted Emission Rates are taken from Table E-3 of API 4332 Fugitive Hydrocarbon Emissions from Petroleum Producing Operations
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"Stream 2 Name"Group 3 Group 4 Group 5
Qty Factor Ext. Qty Factor Ext. Qty Factor Ext.0.492 0 0.347 0 0.0282 00.464 0 0.259 0 0.0437 0
0.0158 0 0.0123 0 0.000755 00.481 0 0.364 0 0.0247 00.913 0 0.603 0 0.059 0
0.0248 0 0.0189 0 0.00117 00.00539 0 0.00431 0 0.00026 0
0.804 0 0.539 0 0.0428 00.0866 0 0.0697 0 0.00415 00.0227 0 0.0497 0 0.000111 0
0.000478 0 0.00104 0 2.13E-06 00.0182 0 0.0388 0 8.34E-05 0
0.00146 0 0.00312 0 6.49E-06 00.12 0 0.249 0 0.00057 0
0.00993 0 0.0201 0 4.55E-05 00.427 0 0.66 0 0.00325 0
0 0 0.00851 0 0 00.213 0 0 0 0 0
0.000222 0 0 0 0 01.11 0 0.00651 0 0.00296 01.14 0 0.337 0 0.128 0
0.569 0 0.00203 0 0.000928 02.19 0 0 0 0 0
0.745 0 0 0 0 0
0.00 0.00 0.00* Predicted Emission Rates are taken from Table E-3 of API 4332 Fugitive Hydrocarbon Emissions from Petroleum Producing Operations
"Stream 3 Name"Group 3 Group 4 Group 5
Qty Factor Ext. Qty Factor Ext. Qty Factor Ext.0.492 0 0.347 0 0.0282 00.464 0 0.259 0 0.0437 0
0.0158 0 0.0123 0 0.000755 00.481 0 0.364 0 0.0247 00.913 0 0.603 0 0.059 0
0.0248 0 0.0189 0 0.00117 00.00539 0 0.00431 0 0.00026 0
0.804 0 0.539 0 0.0428 00.0866 0 0.0697 0 0.00415 0
0.0227 0 0.0497 0 0.000111 00.000478 0 0.00104 0 2.13E-06 0
0.0182 0 0.0388 0 8.34E-05 00.00146 0 0.00312 0 6.49E-06 0
0.12 0 0.249 0 0.00057 00.00993 0 0.0201 0 4.55E-05 0
0.427 0 0.66 0 0.00325 00 0 0.00851 0 0 0
0.213 0 0 0 0 00.000222 0 0 0 0 0
1.11 0 0.00651 0 0.00296 01.14 0 0.337 0 0.128 0
0.569 0 0.00203 0 0.000928 02.19 0 0 0 0 0
0.745 0 0 0 0 0
0.00 0.00 0.00* Predicted Emission Rates are taken from Table E-3 of API 4332 Fugitive Hydrocarbon Emissions from Petroleum Producing Operations
"Stream 2 Name"Group 6 Combined Total
Qty Factor Ext. Emissions9.91E-06 0 0.00000.000016 0 0.00002.64E-07 0 0.00008.37E-06 0 0.0000
2.126E-05 0 0.00003.95E-07 0 0.00009.07E-08 0 0.00000.000015 0 0.00001.45E-06 0 0.0000
0 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.0000
0 0 0.0000
0.00 0.00* Predicted Emission Rates are taken from Table E-3 of API 4332 Fugitive Hydrocarbon Emissions from Petroleum Producing Operations
"Stream 3 Name"Group 6 Combined Total
Qty Factor Ext. Emissions9.91E-06 0 0.00000.000016 0 0.00002.64E-07 0 0.00008.37E-06 0 0.0000
2.126E-05 0 0.00003.95E-07 0 0.00009.07E-08 0 0.00000.000015 0 0.00001.45E-06 0 0.0000
0 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.00000 0 0.0000
0 0 0.0000
0.00 0.00* Predicted Emission Rates are taken from Table E-3 of API 4332 Fugitive Hydrocarbon Emissions from Petroleum Producing Operations
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Location/Building Tag:
Facility Data
Facility Type: Gas Plant Gas Prod Offshore Blank
Connection 1.45E-02 1.70E-02 8.66E-03 4.22E-04 5.70E-03 0.00E+00 Flange 2.32E-02 6.23E-03 4.07E-03 1.16E-03 1.04E-02 0.00E+00 Open End 5.46E-02 3.63E-02 6.38E-02 8.18E-03 5.37E-02 0.00E+00 Pump Seal 6.09E-01 1.03E-02 1.68E-02 no data 1.03E-02 0.00E+00 Valve 2.04E-01 1.39E-01 7.00E-02 6.86E-04 2.72E-02 0.00E+00
Other 2.57E-01 4.86E-01 3.97E-01 3.70E-03 3.67E-01 0.00E+00
Predicted Emission Rates
Component
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Gas Prod Light Crude Gas Prod Gas Prod Gas ProdQty Factor Ext. Qty Factor Ext. Qty Factor Ext. Qty Factor Ext. Qty Factor Ext.
Connection 218 0.01700 3.706 162 0.00866 1.403 0.01700 0.000 0.01700 0.000 0.01700 0.000Flange 52 0.00623 0.324 0 0.00407 0.000 0.00623 0.000 0.00623 0.000 0.00623 0.000Open End 0 0.03630 0.000 0 0.06380 0.000 0.03630 0.000 0.03630 0.000 0.03630 0.000Pump Seal 14 0.01030 0.144 0 0.01680 0.000 0.01030 0.000 0.01030 0.000 0.01030 0.000Valve 43 0.13900 5.977 39 0.07000 2.730 0.13900 0.000 0.13900 0.000 0.13900 0.000
Other 4 0.48600 1.944 3 0.39700 1.191 0.48600 0.000 0.48600 0.000 0.48600 0.000
TOTAL (lb/day) 12.095 5.324 0.000 0.000 0.000
Light Crude Heavy Crude
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Ventilation Rate Required for Adequate VentilationComponent
MW LEL UELStream 1 Stream 2 Stream 3
Mol Fr. Avg. MW LEL Mol Fr. Avg. MW LEL Mol Fr. Avg. MW LELHydrogen 2.016 4 74.2 0.000 0.0 0.000 0.0 0.000 0.0Helium 4.003 0.0008 0.003 0.0 0.000 0.000Nitrogen 28.013 0.0457 1.280 0.0 0.000 0.000Carbon Dioxide 44.010 0.0010 0.044 0.0 0.000 0.000Hydrogen Sulfide 34.082 4.3 45.5 0.0000 0.000 0.0 0.000 0.0 0.000 0.0Methane 16.043 5 15 0.9500 15.241 4.8 1.0000 16.043 5.0 0.000 0.0Ethane 30.070 2.9 13 0.0022 0.066 0.0 0.000 0.0 0.000 0.0Propane 44.097 2 9.5 0.0002 0.009 0.0 0.000 0.0 0.000 0.0Iso Butane 58.123 1.8 8.5 0.0001 0.006 0.0 0.000 0.0 0.000 0.0Butane 58.123 1.5 9 0.000 0.0 0.000 0.0 0.000 0.0Iso Pentane 72.150 1.3 8 0.000 0.0 0.000 0.0 0.000 0.0Pentane 72.150 1.4 8.3 0.000 0.0 0.000 0.0 0.000 0.0Hexane 86.177 1.1 7.7 0.000 0.0 0.000 0.0 0.000 0.0Heptane 100.204 1 7 0.000 0.0 0.000 0.0 0.000 0.0Octane 114.231 0.8 6.5 0.000 0.0 0.000 0.0 0.000 0.0Nonane 128.258 0.7 5.6 0.000 0.0 0.000 0.0 0.000 0.0Decane+ 142.285 0.7 5.4 0.000 0.0 0.000 0.0 0.000 0.0
H20 18.015 0.0000 0.000 0.000
Total: 1.0000 16.649 4.8 1.0000 16.043 5.0 0.0000 0.000 0.0 TOTALEmissions Rate (lb/day): 25.455 0.000 0.000 25.455
Vol of gas at Std Press & Bldg Temp (cf/lb-mol): 394.024 394.024 394.024 394.024G - Volumetric Emissions Rate (cfm): 0.41836 0.000 0.000 0.418
Q, Adequate Ventilation Rate Required (cfm): 35.17886 0.000 0.000 35.179Q', Ventilation Rate with 4 x Safety Factor (cfm): 140.71544 0.000 0.000 140.715
Q', Ventilation Rate with 4 x Safety Factor (ACPH): 2.23107 0.00000 0.00000 2.23107
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Leakage Area
Infiltration Element Crack Length / Area Units Infiltration Factor Units Remarks
Double Door Ft 3.61 cm2/ Ft 0.0Single Door 40.0 Ft 3.61 cm2/ Ft 144.4Windows 36.9 Ft 3.61 cm2/ Ft 133.2Louvers - Open Ft^2 238.30 cm2/ Ft2 0.0Louvers - Closed Ft^2 4.65 cm2/ Ft2 0.0 Exhaust Fans Ft^2 29.00 cm2/ Ft2 0.0Ridge Vent - Open Ft^2 464.50 cm2/ Ft2 0.0
Ridge Vent - Closed Ft^2 46.50 cm2/ Ft2 0.0
TOTAL: 277.6
Specific Infiltration (from ASHRE Handbook, Chapter 26, Eq'n 40):
Q/L =
Q/L = 12.33333
A =∆T = temperature difference between indoor and outdoor (K).
B =v = average wind speed (m/s).
Building Infiltration Rate353.15 °K
336.15 °KAverage Temperature Difference, ∆T 17.00 °K
Stack Coefficient, A 0.00015Wind Coefficient, B 0.00319Average Wind Speed, v 1.00 m/s
Specific Infiltration, Q/L 0.0751997
Total Leakage Area, L 277.6
Building Volume 107.1
Estimated Air Changes Per Hour 0.1949 ACPH
Required Air Changes Per Hour 2.23107 ACPH
Additional Air Changes Required 2.03621 ACPH
Leakage Area (cm^2)
[(A*∆T + B* v2)]1/2
specific infiltration, m3/h*cm2
stack coefficent (m3/h)2 (cm)-4 (K); from Table 7.
wind coefficent (m3/h)2 (cm)-4 (m/s)-2; from Table 8 & Table 9.
Temperature of Indoor Air, Ti
Temperature of Outdoor Air, To
(m3/h)2 (cm)-4 (°K)(m3/h)2 (cm)-4 (m/s)-2
m3/(h.cm2)
cm2
m3
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Determine Louver Area Required to Create 1 ACPH:
Naturally Ventilated Enclosure Due to Thermal Forces (Stack Effect); API 505, Section 6.6.2.4.5
h = (Eq'n 2)
h = Height from the center of the louver opening to the NPL, ft
H =
A = (Eq'n 1 divided by 12)
A =h = See Eq'n 2
Louver Area Required for Adequate Ventilation540.0 °R
523.0 °RH, ft 2.17 ftEq'n 2, h 1.07 ft
Building Volume 3784.25
Free area of Inlet (or Outlet) Louvers, A 1.43 <---- Area required for 1 ACPH
Total Est. Louver Area Required 2.92 <---- Area required for Adequate Ventilation
H/[1+(A1/A2)2 (Ti/To)]
Vertical distance (center-to-center) between A1 and A2, ft
A1 = Free area of lower opening, ft2
A2 = Free area of upper opening, ft2
Ti = Temperature fo indoor air, oR
To = Temperature fo outdoor air, oR
V/[1200*12(h(Ti - To)/Ti)1/2]
Free area of inlet (or outlet) opening(s), ft2 (includes a 50% effectiveness factor)
Ti = Temperature fo indoor air, oR
To = Temperature fo outdoor air, oR
Temperature of Indoor Air, Ti
Temperature of Outdoor Air, To
ft3
ft2
ft2
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Louver Sizing & Opening Requirements (Type 2):
Naturally Ventilated Enclosure Due to Thermal Forces (Stack Effect); API 505, Section 6.6.2.4.5 Type 2 - Building:
h = (Eq'n 2)
h = Height from the center of the louver opening to the NPL, ft
H =
Q = (Eq'n 1, Q=V*12)
Q =h = See Eq'n 2
Louver Area Required for Adequate Ventilation Non-Identical Inlet & Outlet Areas540.0 °R Outlet Area : Inlet Area Delta Q (%)
523.0 °R 1.00 0.00
1.10 5.00Qty Length Width % Open Area 1.25 10.00
3 2.0 2.0 100% 12.00 1.50 18.00
4.10 1.75 22.50
2.00 26.50Qty Length Width % Open Area 2.25 28.50
3 2.0 2.0 100% 12.00 2.50 31.50
4.10 2.75 32.50
A2 4.10 3.00 34.00
Ratio of A1 & A2 1.00 3.25 35.00H 5.88 ft 3.50 36.00Eq'n 2, h 2.893 ft 4.00 37.00
0.0 %5.00 37.50
Air Flow, Q (corrected) 17,834.9 6.00 38.00
Ventilation Rate from Louvers 4.7129 ACPH * Data from Figure 1, Section 6.6.2.4.6
Total Bldg Ventilation Rate (Infiltration + Louvers) 4.9078 ACPH from API Recommended Practices 505
Total Required Ventilation Rate 2.2311 ACPH
H/[1+(A1/A2)2 (Ti/To)]
Vertical distance (center-to-center) between A1 and A2, ft
A1 = Free area of lower opening, ft2
A2 = Free area of upper opening, ft2
Ti = Temperature fo indoor air, oR
To = Temperature fo outdoor air, oR
1200*A*12(h(Ti - To)/Ti)1/2
Air Flow, ft3/hr
Ti = Temperature fo indoor air, oR
To = Temperature fo outdoor air, oR
Temperature of Indoor Air, Ti
Temperature of Outdoor Air, To
Lower Louver Area, A1
A1 ft2
Effective A1 (Worst case 0.342) ft2
Upper Louver (Ridge Vent) Area, A2
A2 ft2
Effective A2 (worst case 0.342) ft2
Smallest Area Out of A1 & A2 ft2
Increase in Flow Caused by Excess of One Opening over Anouther (Figure 1)
ft3/hr
A2
A1
H
1.00 2.00 3.00 4.00 5.00 6.000.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
f(x) = − 0.2908212 x⁴ + 4.9457045 x³ − 31.312251 x² + 89.24275 x − 61.730742
Increase in Flow Caused by Excess Area of One Opening over the Other API Recommended Prac-
tices 505 Section 6.6.2.4.6
Delta Q (%)Polynomial (Delta Q (%))
Ratio of Outlet to Inlet Area or Vice-Versa
Inc
rea
se
, Pe
rce
nt
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Client: Rev Description Date By Chk'd Appr.0 0 Issued for Final Report 10/7/6
Louver Sizing & Opening Requirements (Type 1):Type 1 - Building:
Naturally Ventilated Enclosure Due to Thermal Forces (Stack Effect); API 505, Section 6.6.2.4.5
h = (Eq'n 2)
h = Height from the center of the louver opening to the NPL, ft
H =
Q = (Eq'n 1, Q=V*12)
Q =h = See Eq'n 2
Louver Area Required for Adequate Ventilation Non-Identical Inlet & Outlet Areas540.0 °R Outlet Area : Inlet Area Delta Q (%)
523.0 °R 1.00 0.00
1.10 5.00Qty Length Width % Open Area 1.25 10.00
2 1.0 1.0 100% 2.00 1.50 18.00
0.68 1.75 22.50
2.00 26.50Qty Length Width % Open Area 2.25 28.50
1 32.2 0.8 100% 24.15 2.50 31.50
24.15 2.75 32.50
A1 0.68 3.00 34.00
Ratio of A1 & A2 35.31 3.25 35.00H 2.17 ft 3.50 36.00Eq'n 2, h 2.168 ft 4.00 37.00
38.0 %5.00 37.50
Air Flow, Q (corrected) 3,551.2 6.00 38.00
Ventilation Rate from Louvers 0.9384 ACPH * Data from Figure 1, Section 6.6.2.4.6
Total Bldg Ventilation Rate ( Louvers) 0.9384 ACPH from API Recommended Practices 505
Total Required Ventilation 2.2311 ACPH
H/[1+(A1/A2)2 (Ti/To)]
Vertical distance (center-to-center) between A1 and A2, ft
A1 = Free area of lower opening, ft2
A2 = Free area of upper opening, ft2
Ti = Temperature fo indoor air, oR
To = Temperature fo outdoor air, oR
1200*A*12(h(Ti - To)/Ti)1/2
Air Flow, ft3/hr
Ti = Temperature fo indoor air, oR
To = Temperature fo outdoor air, oR
Temperature of Indoor Air, Ti
Temperature of Outdoor Air, To
Lower Louver Area, A1
A1 ft2
Effective A1 (Worst case 0.342) ft2
Upper Louver (Ridge Vent) Area, A2
A2 ft2
Smallest Area Out of A1 & A2 ft2
Increase in Flow Caused by Excess of One Opening over Anouther (Figure 1)
ft3/hr
A1
H
A2
1.00 2.00 3.00 4.00 5.00 6.000.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
f(x) = − 0.2908212 x⁴ + 4.9457045 x³ − 31.312251 x² + 89.24275 x − 61.730742
Increase in Flow Caused by Excess Area of One Opening over the Other API Recommended Practices
505 Section 6.6.2.4.6
Delta Q (%)Polynomial (Delta Q (%))
Ratio of Outlet to Inlet Area or Vice-Versa
Inc
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