API 4589 : 1993

EXECUTIVE SUMMARY
1 STUDY METHODOLOGY
      INTRODUCTION
          Objectives
          Scope
      DESCRIPTION OF METHODOLOGY
          Study Site Selection
          Screening Procedures
          Bagging Procedures
          Laboratory Procedures
          Quality Assurance/Quality Control Procedures
      DATA MANAGEMENT
          Development of Correlation Equations
          Development of Emission Factors
2 ONSHORE RESULTS AND ANALYSIS
      DATA COLLECTION
      QUALITY ASSURANCE/QUALITY CONTROL
      CORRELATION EQUATIONS
      EMISSION FACTORS
          Average Emission Factors
          Leak/No Leak Emission Factors
          Stratified Emission Factors
      SPECIATION OF EMISSIONS
      REGIONAL DIFFERENCES IN FUGITIVE EMISSIONS
      CONTROL EFFICIENCY OF INSPECTION AND MAINTENANCE
      PROGRAMS
3 OFFSHORE RESULTS AND ANALYSIS
      DATA COLLECTION
      QUALITY ASSURANCE/QUALITY CONTROL
      CORRELATION EQUATIONS
      EMISSION FACTORS
          Average Emission Factors
          Leak/No Leak Emission Factors
          Stratified Emission Factors
      SPECIATION OF EMISSIONS
      REGIONAL DIFFERENCES IN FUGITIVE EMISSIONS
      CONTROL EFFICIENCY OF INSPECTION AND MAINTENANCE
      PROGRAMS
FUGITIVE EMISSIONS WORKBOOK
LIST OF APPENDICES
APPENDIX A STATISTICAL ANALYSIS OF DATA
APPENDIX B FIELD INVENTORY SHEET DATA
APPENDIX C EMITTER DATA
APPENDIX D NONAROMATIC SPECIATION DATA
APPENDIX E AROMATIC SPECIATION DATA
TABLES
ES-1 Number of Components Screened, Emitters Found, and
      Samples Collected and Analyzed during API/GRI
      Study
ES-2 Correlation Equations
ES-3 Default Zero THC Emission Factors
ES-4 Average THC Emission Factors (Overall)
ES-5 Average THC Emission Factors (Component Specific)
ES-6 Leak/No Leak THC Emission Factors
ES-7 Stratified THC Emission Factors
ES-8 Speciated Hydrocarbon Factors
1-1 Sites included in the 1993 API/GRI Study
2-1 Components Screened and Emitters Found at Onshore
      Sites
2-2 Onshore Emitters by Screening Range
2-3 Contribution of Each Screening Range to Total
      Emissions
2-4 First and Second Analyses for Nonaromatic
      Hydrocarbons
2-5 First and Second Analyses for Aromatic Hydrocarbons
2-6 Correlation of Repeated Laboratory Analyses
2-7 Correlation Equations
2-8 Default Zero THC Emission Factors
2-9 Average THC Emission Factors (Overall)
2-10 Average THC Emission Factors (Component specific)
2-11 Leak/No Leak THC Emission Factors
2-12 Stratified THC Emission Factors
2-13 Weight Fraction of Emissions by Number of Carbons
2-14 Average Emission Rate of Components with ISVs of
      100,000 ppmv (By region)
3-1 Components Screened and Emitters Found at Offshore
      Platforms
3-2 Offshore Emitters by Screening Range
3-3 Contribution of Each Screening Range to Total
      Emissions
3-4 Correlation Equations
3-5 Default Zero THC Emission Factors
3-6 Average THC Emission Factors (Overall)
3-7 Average THC Emission Factors (Component specific)
3-8 Leak/No-Leak THC Emission Factors
3-9 Stratified THC Emission Factors
3-10 Weight Fraction of Emissions by Number of Carbons
3-11 Number of Components Installed on Pacific OCS
      Platforms Monitored by the MMS, and the Average
      Leak Rates
3-12 Fugitive Hydrocarbon Emissions Predicted by MMS
      and API/GRI Correlation Equations
FIGURE
Various

The emissions factors derived in this report indicate that fugitive emissions from production facilities are considerably lower than they were in the late 1970s.