ABSTRACT
Data from emission measurements benefit a company in many ways. Companies use these data for permits and compliance audits, for determining the effectiveness of control equipment, for the design of pollution control strategies, and for implementation of waste minimization and pollution prevention programs. To detect fugitive emissions from equipment, such as valves, flanges, pumps, or motors, screening or bagging tests are used, in which the device is enclosed to capture leaks. Equipment emission measurements are made by a portable hydrocarbon analyzer at potential leak points. The stack gas is withdrawn isokinetically from the source with the particulate emissions collected in a probe and on heated filters and the gaseous emissions collected in a series of chilled impingers. Indirect methods are best suited for the measurement of emission rates from large, heterogeneous sources. The environmental engineer measures the emission flux indirectly by collecting ambient concentrations upwind and downwind of the emission source.
