Ill. Admin. Code tit. 35 § 211.5250
"Process weight rate" means the actual weight or engineering approximation thereof of all materials except liquid and gaseous fuels and combustion air introduced into any process per hour. For a cyclical or batch operation, the process weight rate shall be determined by dividing such actual weight or engineering approximation thereof by the number of hours of operation excluding any time during which the equipment is idle. For continuous processes, the process weight rate shall be determined by dividing such actual weight or engineering approximation thereof by the number of hours in one complete operation, excluding any time during which the equipment is idle.
Ill. Admin. Code tit. 35, § 211.5250
Added at 17 Ill. Reg. 16504, effective September 27, 1993