Tube-sheet assembly for urea plant
AssigneeStamicarbon B.V.
InventorsAlexander Aleida Antonius SCHEERDER, Markus Theodorus Marie Michaël WAGEMANS
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Abstract
Disclosed is a tube-sheet suitable for holding a tube bundle of a shell-and tube heat exchanger adapted to withstand the pressure at the shell side. Said sheet comprises a carbon steel plate provided with a plurality of holes. Both surfaces of the tube-sheet are covered by a weld overlay, said weld overlay comprising a layer of duplex stainless steel on at least one surface thereof. The sleeves are fixed to the tube-sheet by means of a weld connection to either weld overlay. Hereby at least one such connection is on the inside of the holes.
Claims13
A tube-sheet assembly suitable for holding a tube bundle of a shell-and tube heat exchanger, said tube-sheet assembly comprising a carbon steel sheet having first and second sheet surfaces facing away from each other, said carbon steel sheet being covered on either sheet surface by a weld overlay comprising an outer layer made of duplex stainless steel, said tube-sheet assembly being provided with a plurality of holes defined by hole walls extending from one outer surface to the other, wherein said holes are provided on the inside with a sleeve made of duplex stainless steel, the sleeves protecting the carbon steel part of the hole walls in their entirety, wherein the sleeves are fixed to the tube-sheet assembly by means of a weld connection to either weld overlay, and wherein on at least one end of the sleeves said weld connection is on the inside of the hole.
Dependencies are inferred from the claim text.