ARSD 74:36:01:13. Process weight rate defined

Process weight per hour is the total weight of all raw materials and other materials introduced into any specific process that may cause an emission of a regulated pollutant. Solid fuels charged are considered as part of the process weight, but liquid and gaseous fuels and combustion air are not. The process weight rate for continuous or long-run steady-state operations is the total process weight for the entire period of continuous operation or for a typical portion divided by the number of hours of the period or portion. The process weight rate for cyclical or batch operation is the total process weight for a period that covers a complete operation or an integral number of cycles divided by the hours of actual process operation during such a period. If the nature of a process or operation or the design of equipment permits more than one interpretation of data, the interpretation that results in the minimum value for allowable emissions applies.