Abstract
A hybrid (gas/induction) furnace for preheating hollows up to 120 m in length for processing in a stretch reducing mill (SRM) has recently been installed at BSC's Tubes Division Works at Corby, Northants. The control system needed to ensure that tube is presented to the SRM at the required temperature within close tolerance has posed some interesting problems. Two of these problems: the feed-forward system for the control of the induction section, and the logic requirements of that part of the safety system concerned with tube stoppage within the furnace; are described in some detail. The control system employed is the Babcock-Bristol Micro-B, and the software language used is ACCOLG.
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