Executive Summary

Multiple combinations of wired and wireless monitoring of existing controlled tank top equipment, including replacement of some overpressure protection technologies, were deployed to help industry continuously monitor emissions from near atmospheric controlled tanks and to make informed decisions associated with the business impact of lost fugitive and vented emissions. Insights were also gained on their relative contribution towards the total emissions released. Non intentional (i.e., fugitive) emissions across seals of overpressure protection devices in the closed position typically resulted in lower emissions by relative magnitude than emissions through overpressure protection devices opening to relieve pressure by design.