API 4638 : 1996

1 AN INTRODUCTION TO FUGITIVE HYDROCARBON EMISSIONS
    What are fugitive hydrocarbon emissions?
    What are emission factors?
    What are correlation equations?
    How are fugitive hydrocarbon emissions quantified?
    How do I calculate fugitive hydrocarbon emissions
    from my site
2 METHODS OF CALCULATING FUGITIVE HYDROCARBON EMISSIONS
    Method 1. The EPA Average Emission Factor Method
    Method 2. The EPA Screening Value Range Emission
                Factor Method
    Method 3. The EPA Default Zero Factor, Correlation
                Equation, and Pegged Source Factor Method
    Method 4. The Leak Quantification Method
Comparison of Results
3 METHOD 1 - USING EPA AVERAGE EMISSION FACTORS TO
    CALCULATE FUGITIVE HYDROCARBON EMISSIONS
4 METHOD 2 - USING EPA SCREENING VALUE RANGE EMISSION
    FACTORS TO CALCULATE FUGITIVE HYDROCARBON EMISSIONS
5 METHOD 3 - USING EPA DEFAULT ZERO FACTORS,
    CORRELATION EQUATIONS, AND PEGGED SOURCE FACTORS TO
    CALCULATE FUGITIVE HYDROCARBON EMISSIONS
6 METHOD 4 - USING LEAK QUANTIFICATIONS TO CALCULATE
    FUGITIVE HYDROCARBON EMISSIONS
7 COMPONENT SCREENING PROCEDURES
8 LEAK QUANTIFICATION PROCEDURES
    The Vacuum Technique
    The Blow-Through Technique
    The High Flow System
9 DEFINITIONS
10 LIST OF REFERENCES

Result of five years of field testing of equipment components at production facilities across the United States, is a valuable tool for petroleum producers who are interested in estimating fugitive emissions from their oil and gas production sites. Four methods of calculating fugitive emissions are presented: EPA Average Emission Factor Method, EPA Screening Value Range Emission Method, EPA Correlation Method, and Leak Quantification Method.