Double-walled barrel and method of its manufacture

摘要

A double-walled barrel and method of manufacture including a cylindrical barrel jacket with a first set of corrugations, having a top with barrel openings and a bottom attached to the cylindrical barrel jacket by a first set of folds forming an outer barrel. A steel container with an inner top with barrel openings and an inner bottom attached to the container by a second set of folds forming an inner barrel. The inner barrel is configured and dimensioned to closely fit within the outer barrel. The inner top is joined to the top.