Tubesheets for U-Tube Heat Exchangers
The tubesheet constitutes a structurally important and economically significant element in a tubular heat exchanger. The thickness of the tubesheet affects the hardware cost in a number of ways. The time spent to drill and to ream the tube holes is directly related to the tubesheet thickness. The portion of the tube length lying within the tubesheet is effectively lost for heat transfer and must be replaced by increasing the tube (and hence the unit) overall length. The depth of the tube roll is also dependent on the tubesheet thickness; typically, the depth of the roll is specified as the tubesheet thickness less 1/8 in. Although some industry standards provide for limiting the maximum roll depth to 2 in., many process conditions warrant complete elimination of the stagnant annulus between the tube and the tubesheet on the shellside which necessitates a full depth roll. All of these factors pertaining to the tubesheet have a bearing on equipment cost.
KeywordsWelding Drilling Perforation Flange Allo
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