Hi Tore
A big redrawing of the piping under the decking!
There is little detail we know about this piping outside the pressure hull. The only thing we know for sure is the pressure hull opening (Figure 4). I initially imagine the piping run just above pressure hull but I now know there is just not enough room to do this.
Next I needed to workout where the pipes enter the saddle tanks. I did this by matching deck hatches. I ended up using the four hatch covers for the exhaust gas and emergency blowing systems.
I also initially imagine the piping for the exhaust gas and emergency blowing systems run just above pressure hull but now I know there is just no room. So I move most of the exhaust gas and emergency blowing piping and Fuel oil compensating piping to just under the wooden deck. This was confirmed in a photo in the book
The U-boat By
Eberhard Rossler, where you can see one of the exhaust gas and emergency blowing systems pipe just below the deck.
Fig. 1. Openings.
Fig. 2. Piping.
Fig. 3. Hatch covers.
Fig. 4. Pressure Hull opening.
Fig. 5. Close-up.