Abstract: In a chemical plant, a fixed tube-sheet heat exchanger with a shell diameter of 4 000 mm has higher pressure, higher temperature and low-temperature operation requirements, larger diameter, and larger temperature differences in accident conditions. So, there are certain difficulties in material selection, tube sheet structure design and manufacturing plan. This paper introduces the design process of the heat exchanger in detail from such design links as material selection of the tube side and shell side cylinder, strength calculation, tube sheet forging scheme, material and manufacturing technical requirements, non-destructive testing and so forth. In order to meet the requirements of higher pressure and low temperature, 09MnNiD forge pieces plus surfacing material were selected as the tube box material, the tube sheet selected tube side and shell side ends with shoulder bolts made of 09MnNiD forge pieces and solid forging was chosen in the manufacturing plan; meanwhile, detailed test and inspection technical requirements were put forward for the entire manufacturing process.

Key words: heat exchanger, material selection, forging piece, design plan, material technical requirements, manufacturing technical requirements