Rolling conditioning BP grinder, equipped with a baghouse (No. 1 4 BP grinders share a common baghouse) GRACE CONSULTING, INC 80 tph 52 tph gr/dscf Permitted Maximum operating rate of 80 tph is based on all 4 grinders (BP grinders 14) operated at the same time. PE from the four grinders are captured and vented to a common baghouse.