Tores mailbox VIIC and VIIC/41 operation and technical details

[tore]

Simon.
Airstarting system.
This just the way it is, well done I guess it is an extra  small pipe from the forward end of the starting airvessel probably going  up to the pressuregauge.
Tore

[tore]

To all friends in US happy Thanksgiving!  to Simon good morning and  friends in Europe good night, I think it was an interesting day and I`m hitting the sack.
Tore

[TopherVIIC]

Thanks Tore from the U.S. ! I am thankful that you are able to give us so much new information and help us with our studies!
Christopher

[NZSnowman]

Gruetzner lubricator

[NZSnowman]

Hi Tore/Maciek

On Plate 10:  Fuel oil compensating system (circulating water under pressure), the handle for valve 'B' are located within the engine room?

http://www.uboatarchive.net/U-570Plate10.htm

[tore]

Simon.
Your drawings are getting more and more details. Knowing your likings for details, have a look at my bad picture below. The knife filters have usually a wheel or a handle at the top which is connected to a "brush" inside the filter cleaning the filterelement by turning the handle. I believe on the picture below it is a T-handle. I don`t fully understand the two smaller pipes coming from the top.
Tore

[tore]

Simon.
Fueloil compensating valves fuel oil saddle tanks.
The upper drawing you are showing is the system outside the pressurehull and I don`t believe the valves are operated from inside the pressurehull. The fuel/ballast saddletank 2 and 4 starboard and port are just made of light steel sheets and do not withstand any large pressure. They are equipped both as full fueloil bunkertanks and  full ballast tanks with all the connections required. The encircled valves have two positions either in direct connection with the head/buffertank in the tower or in contact with the sea via a small compensatingbox in the bottom of the tank. As fueltank the first position shall be used to ensure the compensating head is allways positive but not exceeding the differential pressure (the hight difference between the headtank in the tower and the fueltank). Eg. irrelevant of the ambient pressure regardless the diving depth. 
Tore

[tore]

Simon-
Side view engine drawing.
I just had another look on the fuelsupply/drainpipes realizing it is not yet finished but nevertheless I put forward a few remarks. It looks to me that the drain from the knife filter driptray is hooked up to the suctionside of the engine driven fuel supplypump instead of a funnel/collectingtank and what I presume is the supplyline to the knife filter seems to go up and not horizontally to the filter. See my picture.
Tore

[NZSnowman]

Hi Tore

I am trying to update my fuel lines now (the copper colour piping).

• I noted that I have miss the outlet pipe from the fuel filter.
• I seen to also missing the inlet piping to the fuel filter. Does it enter into the back of the filter? Where does the fuel come from?

[tore]

Simon.
It is a bit difficult to explain without the supply pipe from the daytank and the next cock so I introduce them as well. Fuel comes from the overhead daytank to cock 1 violet pipe. normally it goes to the fuel supplypump suction pressure boosted an goes from the pump (red) to a cock directing the fuel to the dual filter comes from the filter to the next cock from there to the knifefilter and the HP fuelpumps (still red). The cocks makes it possible to shut off either pump or the dualfilter or both. then you can operate for emergency the engine by the gravity supply of the overheadtank and filter the fuel by the knife filter. The yellow drain from the knifefilter is not connected to the system.
Tore

[tore]

Simon the above picture was lousy I am trying a better quality below.
Tore

[tore]

Simon .
Just another try to see if I can produce a better quality picture of the system.
Tore

[NZSnowman]

Thanks Tore

Don't do any drawing today, so will have a look tomorrow.

Off to bed now 

[NZSnowman]

The yellow drain from the knifefilter is not connected to the system.

Hi Tore

The drain line is this drawing may look like its connected to this system, but I have the fuel system on a different layer. I will add this layer to the drawing and post pictures for you.

Simon

[NZSnowman]

New fuel oil filter and now including inlet piping