Dirt

The condenser of the turbine feedwaterpump of Eems 20.
The differential pressure between seacoolingwater in- and outlet was going up so the condenser had to be inspected.
Yes, plenty seaweeed (grasses) were clogging the upper part of the piping.
A special firm is hired to clean this with high pressure equipment.
The cooling water flows through the pipes thus cooling down the steam from the turbine and making water (condensate) of it again.
On the insert you can see a detail of the pipes.

This is a backblip, see also the Blip of sunday.