Superheat rules in place and documented for maximum superheat (+60C over tap temperature during holding) with reaction plan in place. Allowing to cool only is not an acceptable reaction plan, must address carbide risk. (Maximum furnace temperature specification and control - Maximum holding temperature should be 50C below tapping temperature - Should never exceed 1650C) Defined count measurement system or automatic temperature shut-off are acceptable to guarantee minimum superheat. [N/A for Cupola.]