Tube Sheet Questions (II)
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2. For U-tube plate heat exchangers and fixed-plate heat exchangers that use the type e connection between the plate, the shell, and the tube box as specified in Figure 7-3 of GB/T 151-2014: 1) In the case of a U-tube plate heat exchanger under the influence of Pt(+) alone, which of the following statements is correct? (2.0 points) A. An increase in the flange torque on the shell side leads to an increase in the maximum stress in the plate. B. A decrease in the flange torque on the shell side leads to a decrease in the maximum stress in the plate. C. The maximum stress occurs at the center of the plate. D. The maximum stress occurs at the edge of the plate. Answers: A, C. 2) In the case of a U-tube plate heat exchanger under the influence of Ps(+) alone, which of the following statements is correct? (2.0 points) A. An increase in the flange torque on the shell side leads to an increase in the maximum stress in the plate. B. A decrease in the flange torque on the shell side leads to a decrease in the maximum stress in the plate. C. The maximum stress occurs at the center of the plate. D. The maximum stress occurs at the edge of the plate. Answers: B, C. 3) For fixed-plate heat exchangers under the influence of Pt(+) alone, which of the following statements is correct? (2.0 points) A. An increase in the flange torque on the shell side leads to an increase in the maximum stress in the plate. B. A decrease in the flange torque on the shell side leads to a decrease in the maximum stress in the plate. C. The maximum stress occurs at the center of the plate. D. The maximum stress occurs at the edge of the plate. Answers: B, D. 4) For fixed-plate heat exchangers under the influence of Ps(+) alone, which of the following statements is correct? (2.0 points) A. An increase in the flange torque on the shell side leads to an increase in the maximum stress in the plate. B. A decrease in the flange torque on the shell side leads to a decrease in the maximum stress in the plate. C. The maximum stress occurs at the center of the plate. D. The maximum stress occurs at the edge of the plate. Answers: A, D
2) Under the sole effect of Pt(+), the correct descriptions regarding the U-tube sheet heat exchanger are: A. The shell-side flange moment increases the maximum stress on the tube sheet; C. The maximum stress on the tube sheet occurs at its center. 3) For a U-tube sheet heat exchanger under the sole influence of Ps(+), the correct description is: B. The flange torque on the shell side reduces the maximum stress in the sheet; C. The maximum stress in the sheet occurs at the center of the sheet. 4) For a fixed-tube-sheet heat exchanger under the sole effect of Pt(+), the correct descriptions are: B. The shell-side flange torque reduces the maximum stress in the tube sheet, and D. The maximum stress in the tube sheet occurs at the edge of the tube sheet. 4) For a fixed-tube-sheet heat exchanger under the sole action of P(+), the correct description is: A. The flange force on the shell side increases the maximum stress in the tube sheet; D. The maximum stress in the tube sheet occurs at its edges. .
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