Pumping concentrated brown grease at 180 degrees F into a heated 10,000-gallon storage tank at the Easterly Wastewater Treatment Plant in Cleveland, Ohio, occasionally tricked the ultrasonic level sensor when steam affected the return signal to the transducer. Overflows looked like liquid peanut butter oozing down the sides of the tank and pooling on the floor.
Water in the grease seeped behind the external electric heating jacket on the tank, shorting out elements, corroding the metal, and causing leaks. As the pads lost heating capacity, the oil cooled enough to cake on the
