Seeking guidance on heat exchanger material selection issues
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Yesterday, this post was accidentally posted in the container section; I’m posting it again today, hoping that someone with expertise can offer some guidance. It’s a vertical type heat exchanger, with heat exchange tubes made of 316 material. The upper part of these tubes is 300 mm long, and the material required for the upper tube box is NS312. Some manufacturers design the tube box using Q345R material with NS312 welded on top, while others use an NS312-lined structure for the tube box. Which approach is better? Design parameters: Design pressure of the shell side is 5.45 MPa, and the design pressure of the tube side is 0.25 MPa ； Design temperature: 125°C at the shell side inlet, 205°C at the outlet℃ ； The inlet temperature of the tube side is 270°C, and the outlet temperature is 135°C; boiler water flows in the shell side, while the reaction gas flows in the tube side. Thank you!
#Reply quickly here: #The tube sheet is Q345R with NS312 surfacing
Friend upstairs, regarding the material choice for the tube box: should it be Q345R with NS312 surfacing, or an NS312 lined structure? Which option is better and what are the reasons? Thank you!