Abstract
Tracer experiments were carried out to quantify the diffuse leakages of hydrocarbons at two petrochemical complexes in Norway. Single tracer (SF6) and dual tracer (SF6/CBrF3) experiments were performed for different test designs and different meteorological conditions. A simple proportionality model was applied to estimate leakage rates of ethylene, propylene, ethane, propane and isobutane from different parts of the plants. A discussion of uncertainties in the release rate estimates is also included. Dispersion models were applied to verify concentration profiles and to identify leakage areas. A model using Kz for estimating vertical spread and σθ for estimating horizontal spread, including building size parameters as initial dilution factors, was best correlated to measured tracer concentrations.
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