Detailed installation structure of the bypass baffle
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GB151 specifies that bypass baffles are welded between the baffles; then, should bypass baffles (between the baffles and the tube sheet) also be welded within the space at the inlet and outlet of the heat exchanger? What about U-tube heat exchangers? Generally, bypass baffles are installed in pairs. Can the term “a pair” be understood as meaning “the number of bypass baffles is 2”? Thank you!
Those who know, please reply. The length of your post does not meet the requirements.
There is no need to install bypass baffles between the baffle plates and the tube sheet; the same principle should apply to U-tubes as well. The term \"a pair\" refers to 2
Won’t the bypass flow at the inlet and outlet sections be very large then?
Reply to 4# tank528: The bypass baffle is used to prevent the medium from taking a short circuit, avoiding flow through the middle of the pipes; this issue does not exist at the inlet and outlet points
How long have you been working in design? The bypass baffle is used to prevent fluid short-circuiting between the tube bundle and the shell; please refer to the legend on the first floor.
Reply to 4# tank528: You are absolutely right. The bypass baffles are used to prevent fluid short circuits between the tube bundle and the shell. The diagrams on the first floor are also correct; the bypass baffles shown in those diagrams are intended to prevent short circuits in the flow of the medium when it bends back and forth inside the shell, and there is no sense in installing them at the inlet and outlet areas.
Bypass baffles are based on logarithms, not on a fixed count; three pairs are required for DN>1000!
Between the baffle and the tube sheet, there is actually a passage through which the fluid enters and exits the tube bundle; if a bypass baffle is added, a heat exchange dead zone will naturally be created, meaning that the fluid flowing through the heat exchange tubes near the bypass baffle between the baffle and the tube sheet no longer passes through it.
Are the bypass baffles welded in pairs symmetrically about the axis on the baffle plate? Is each baffle welded in pairs? Should we still weld only one baffle?