I have a question regarding the design pressure for shell and tube heat exchangers
Thread Content
While reviewing the equipment inventory of the design institute, it was found that for some shell-and-tube heat exchangers, the design pressure is indicated as 2.08/2.6 (for the tube side and shell side respectively), but the heat exchanger specifications show BES1100-4.0-325-6/25-4I; isn’t 4.0 referring to the design pressure? Why is it different from what was filled in later? I seek guidance; thank you! (Most heat exchangers have corresponding parts at the front and back; this issue occurred in a few of them.)
1100 denotes that the inner diameter of the heat exchanger shell is 1100 mm; 325 indicates that the heat exchange area of the heat exchanger is 325 m2. The number 6 represents a tube bundle length of 6 m, 4I signifies that there are 4 tube passes, and 25 indicates that the inner diameter of the tubes is 25 mm. 4.0 represents pressure.
I understand this; 4.0 should refer to the design pressure of the heat exchangers being 4.0 in all cases. But I don’t know why 2.08/2.6 is written there
Is it possible that there is a mistake in the specifications of the heat exchanger?
The pressure of the flange on the selected equipment :)
This shouldn’t be possible; the flange pressure shouldn’t be specified there
This is a gauge pressure; 4.0 represents the nominal pressure of the gauge
Could you please explain in detail? Then, which standard is used to determine this design pressure?
The design pressure can only be 2.08/2.6; it’s definitely incorrect to specify 4.0 for the heat exchanger of the same model.
One is the selected specification, and the other is the design pressure. For the standard heat exchanger chosen, it is 4.0; just as with flanges, those designed for high pressures can also be used for low pressures. The designed pressure for this equipment is 2.6, but a heat exchanger of grade 4.0 has been chosen; it seems that the petrochemical industry likes to do this.