Tube sheet assembly

摘要

THIS invention relates to a tube sheet assembly. In particular the invention is concerned with a tube sheet assembly for a waste heat boiler employed in a chemical process plant and which makes use of metal ferrules for protecting the inlets of the exchange tubes of the tube sheet. The tube sheet assembly is characterized therein that at least one thermal insulator is located inside an inlet opening of a tube sheet of the tube sheet assembly, and covers a portion of a respective ferrule of the tube sheet assembly, thereby providing thermal insulation between the tube sheet and the ferrule.