Type 2G heat exchanger can be mounted at the top of a column. The steam enters into the unit through the lower cone, goes up and travels through the center of the exchanger body, which is open at the top and bottom, and comes out in the upper shell, where it changes direction. Fluid condenses through the exchanger body from the top down in the crossing flow.
See the user manual alfa-laval-spiral-instruction-manual-en.pdf for more details.