API 4615 : 1994

EMISSION FACTORS FOR OIL AND GAS PRODUCTION OPERATIONS

American Petroleum Institute

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TABLE OF CONTENTS
EXECUTIVE SUMMARY
INTRODUCTION
API Report No. 4589
EPA August 1994 Correlation Equations
Current Study
COMBINED DATABASE
EPA CORRELATION EQUATIONS, DEFAULT ZERO FACTORS, AND PEGGED
SOURCE FACTORS
CALCULATION OF EMISSION FACTORS
Contribution from Non-emitters
Contribution from Emitters from 10 to 9,999 ppmv
Contribution from Emitters That Pegged Instrument at 10,000
ppmv
Average Emission Factors for Each Site and Each Type of
Component
Leak/No-Leak Emission Factors for Each Type of Facility
ANALYSIS OF EMISSION FACTORS
Site to Site Comparison of Average Emission Factors
Comparison of Leak/No-Leak Emission Factors
Sensitivity of Average Emission Factors to Screening Values
SPECIATION OF EMISSIONS
SUMMARY AND CONCLUSIONS
REFERENCES
LIST OF APPENDICES
APPENDIX A Field Inventory Sheet Data
APPENDIX B Emitter Data
APPENDIX C Leak Rates
LIST OF TABLES
TABLE
1 Sites used to develop new E&P Emission Factors
2 August 1994 EPA Correlation Equations and Factors
3 Intersection of default zeros and Correlation Equations
4 Emission rates used for "Non-emitters"
5 Assumptions for dividing API connections by type
6 Average Emission Factors by site (Ib/component-day)
7 Average Emission Factors by site (Kg/component-hr)
8 Average Emission Factors by facility type (Ib/component-day)
9 Average Emission Factors by facility type (Kg/component-hr)
10 Leak/No-Leak Emission Factors by facility type
     (Ib/component-day)
11 Leak/No-Leak Emission Factors by facility type
     (Kg/component-hr)
12 Average API 1993 THC Emissions Factors [Ib/component-day]
13 Average API 1993 THC Emissions Factors [Kg/component-hr]
14 Comparison of Average Emission Factors
15 Contribution of each screening range to Average Emission
     Factors
16 Specified fugitive Emission Factors
LIST OF FIGURES
FIGURE
1 Relationship of Default Zero, Correlation Equation, and
     Pegged Factors (Connection and Flange)
2 Relationship of Default Zero, Correlation Equation, and
     Pegged Factors (Valve and Open End Line)
3 Relationship of Default Zero, Correlation Equation, and
     Pegged Factors (Pumps and Others)
4 Average Emission Factors for Light Crude Production
     Facilities
5 Average Emission Factors for Heavy Crude Production
     Facilities
6 Average Emission Factors for Gas Production Facilities
7 Average Emission Factors for Gas Plants
8 Average Emission Factors for Offshore Production
     Facilities
9 Connection Emission Factors
10 Flange Emission Factors
11 Open End Line Emission Factors
12 Light Liquid Pump Emission Factors
13 Gas Valve Emission Factors

Abstract

Supplements information found in API 4589 and contains revised emission factors developed from 1993 API data using correlation equations established by EPA in 1994.