Which saltwater-cooled heat exchanger arrangement and location would be MOST problematic in terms of keeping the seawater side filled?

Correct Answer: Option B — Horizontally arranged cooler located above the water line.

A horizontal cooler located above the waterline is prone to air binding because air naturally collects at the highest point of the shell. Without a constant positive head of water, air can easily displace the cooling medium, leading to poor heat transfer and potential overheating of the process fluid.