API 2525 : 1992

Section
1.0 Introduction
2.0 Results of method review
2.1 Summary of EPA's estimation procedures
2.2 Comments on procedures for estimating total
     emissions
2.3 Comments on procedures for estimating emissions of
     individual air toxics
2.4 Conclusions
3.0 Alternate approaches for estimating air toxics
     emissions
3.1 Henry's Law
3.2 Petroleum K-values
3.3 Activity coefficients
3.4 Equations of state
4.0 Validity assessment
4.1 Methodology for estimating vapor compositions
4.2 Discussion of results
4.3 Limitations
5.0 Conclusions and recommendations
5.1 Conclusions
5.2 Recommendations
6.0 References
Appendix: Detailed comparisons of measured and
           predicted vapor compositions for summer and
           winter blend gasolines
Figures
4-1 Measured versus predicted vapor-phase air toxics
     concentrations for summer blend unleaded gasoline
4-2 Impact of assumed temperature on vapor-phase air
     toxics concentrations for summer blend gasoline
4-3 Measured versus predicted vapor-phase air toxics
     concentrations for winter blend unleaded gasoline
4-4 Impact of assumed temperature on vapor-phase air
     toxics concentrations for winter blend gasoline
Tables
4-1 List of components potentially reportable by
     refiners under SARA Title III, Section 313
4-2 Summary of results for summer blend unleaded
     gasoline
4-3 Summary of results for winter blend unleaded
     gasoline

Gives the results of two studies commissioned by API. The purpose of Phase I was to review and assess the validity of the methodology proposed by the Environmental Protection Agency (EPA) for estimating toxic species emissions from storage tanks. The purpose of Phase II was to investigate the validity of assuming ideal liquid behavior (Raoults Law) in predicting hazardous air pollutant emissions from petroleum storage tanks.