Sampling techniques for measuring particulate emissions from four 'atypical' stationary source categories were developed and evaluated. The categories include low effluent velocity streams, extended dimensions, partially or totally unconfined flow, and saturated gas streams or gas streams with entrained liquid droplets. Research included literature surveys, laboratory model testing, and field testing of instruments and techniques on three specific sources -- gravity roof ventilators, grain dryers, and wet scrubbers. These three sources served as representative examples of the four atypical source categories. The sampling techniques recommended for roof ventilator emission measurements include a high volume particulate sampler and a heated thermopile anemometer deployed near the base of the ventilator. The same instruments, deployed at the lower exhaust, are recommended for grain dryer emission measurements. An EPA Method 5 type sampling train, an inertial droplet separator, and a Fecheimer probe are recommended for use in wet scrubber emission measurements.

Final report; "Performing organization, Fluidyne Engineering Corporation"--Technical report data page Sponsored by the Environmental Sciences Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency Contract Number: 68-02-1796 "January 1980." "EPA/600-2-80-034."