The issue of the minimum inner depth of the tube box
Thread Content
According to 5.2.2 b) of GB151, the inner depth of multi-pass tube banks shall ensure that the minimum flow area between two passes is not less than 1.3 times the flow area of the heat exchange tubes in each pass; when operation permits, it may also be equal to the flow area of the heat exchange tubes in each pass. Which dimension does the inner depth in it refer to?
I think it’s the part from the end cap short circuit to the flange
I think it’s the distance from the head or end cover to the tube sheet surface!
There is another issue: when calculating the area by multiplying the distance from the head or end cover to the tube sheet surface by a certain distance to ensure that this area is at least 1.3 times the flow area of the heat exchange tubes in each pass, which specific area needs to be guaranteed?
Multiply by the inner diameter of the tube bank short circuit (the area through which the shell-side fluid flows vertically through the tube bank).