Method for Determining Mass Participate Emissions from Roof Monitors

Abstract

Standard procedures are widely employed for the determination of mass emissions of industrial stack effluents. These procedures, however, are not applicable to the measurement of particulate concentration at most industrial roof monitors (gravity-induced ventilating devices) where low particle concentration and low exit velocity prevail. Also, sampling problems are often complicated by difficult roof access, large monitor size, and the absence of electrical power. United States Steel Research has therefore developed a roof monitor sampling technique which utilizes battery-powered personal samplers and a portable velocity meter and which is applicable to low particle concentrations and low exit velocity. Tests with this technique have been successfully completed on a Basic Oxygen Process (BOP) shop. This technique allows a four to six man crew to complete most surveys in six days or less. Some typical sampling problems for closed roof monitors are outlined. The rationale for the sampling strategy is described and the reduction of raw field data is discussed. The results of a field survey for a BOP shop are described including a detailed look at sampling methodology. Finally, a statistical analysis of various sampling data is presented.