>In some hospitals that pipe oxygen to patients’ rooms, the massive volume of cold liquid oxygen is freezing the equipment needed to deliver it, which can block the system.

So the oxygen systems in hospitals are never stress tested at maximum flow? I see a brisk business in adding a heat exchanger before putting it in the pipes.

The EE department at Cornell has two vaporizers for liquid nitrogen (15% warmer than LOX) that are often iced up. When the icing on one of them gets to be a problem, they switch to the other one.