Techniques and instrumentation for sampling strategies to measure particulate emissions from 'atypical' stationary sources were developed. The four atypical source categories are low effluent streams, extended dimensions, partially or totally unconfined flow, and saturated gas streams or gas streams with entrained liquid droplets. The research program included literature surveys, laboratory model testing, and field testing of several atypical stationary sources. Techniques and instruments were evaluated as to the degree of reliability of measured emissions and applicability to general situations. Three specific sources--gravity roof ventilators, grain dryers, and wet scrubbers--were selected to provide the basis for the research program of the four atypical source categories. Basic characteristics of these sources were identified through literature and personal contact surveys. A program of model testing and field testing of roof ventilator emissions was completed, and a similar program was undertaken for wet scrubbers. The sampling strategy recommended for roof ventilator emission measurement on the basis of the test program includes a high volume particulate sampler and a heated thermopile anemometer deployed near the base of the ventilator.

"EPA-600/2-77-036." "Project Officer: Thomas E. Ward." Includes Appendix: Velocity instrumentation for low velocity, partially confined source particulate sampling, by H.A. Hanson and D.P. Saari. Includes references, p. 119. Includes bibliographical references (pages 93-96).