Heat exchanger piping
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How should the relationship between piping configuration and flow direction be understood?
The standards have already made it clear.
1. The flow direction shown in the diagram refers to the lateral movement of the fluid, not the vertical flow velocity； 2. For better understanding, the gaps in the baffle plates can be indicated during piping, which makes things clear at a glance.
The fluid flow direction refers to the direction in which the shell-side medium flows toward the gaps in the baffle
The flow arrows in the diagram indicate that the fluid is flowing outside the heat exchange tubes; if it were inside the tubes, small circles or dots would be drawn at the center of the tubes to show the direction of flow of the fluid within those tubes. You can understand this better by referring to the diagram showing the flow direction of the fluid on the shell side on page 147.