I saw this technique used at a steel rolling mill I toured. There were accumulators on both ends of the line. The output-side accumulator served the same purpos

I saw this technique used at a steel rolling mill I toured. There were accumulators on both ends of the line. The output-side accumulator served the same purpose as in this video. On the "input" end a new roll's would be welded to end of the running roll as it emptied.