Tores mailbox VIIC and VIIC/41 operation and technical details

[NZSnowman]

Tore, if you have time could you please check my pipes. Also I can not work out one of them.

Thanks, Simon.

[tore]

Simon.
As far as I can see you got  it allright. On the cross section shipyard drawing  "spant 26  von vorn gesehen" you shall find the luboil reducing valve ( 3>1.5 atu) spill off pipe P 14/17connecting to the pipe P 14/19 underneath the suction valve of the luboil pump. The pipe marked with yellow question marks is the main coolingwater supplypipe to the engine. Note the they have changed the original thermometers with smaller modern brass thermometer on several places.
Tore

[tore]

Simon.
The luboil pump being a gearpump would have a opposite inlet and outlet when the direction of rotation is reversed. As port and starboard engines have different direction of rotation  but using the same pump you`ll see the pipeconnections are placed on different sides of the pumps, that`s why you have  4 connections on the pumphousing and blanked off one of them. Another detail to be included is the revolution counter on the top of the pumphousing.
Tore

[NZSnowman]

Simon.
The pipe marked with yellow question marks is the main coolingwater supplypipe to the engine...

I have been trying to put lub oil in this pipe, no wonder why I can not get it to work

[tore]

Simon.
Mixing oil and water is OK if you use anticorrosion oil but not with lubeoil.
Tore

[NZSnowman]

Simon.
As far as I can see you got  it allright...

Thanks Tore! I should have some new drawings for you toworrow.

The number of pipes around the front of the engines is complex. It very hard to get all the different pipes to fit and also to get them to go correctly under or over the other pipes. I had to spited the engine drawing into two different layers today as you can have parts of the engine that are above the decking and parts of it that are below the decking. 

[tore]

Off  topics.
To day it is published by the Norwegian oilcompany Statoil looking for a underwater track to put a gasfield pipe, that they found an U boatwreck laying at 250 m only 2000 m from the famous U-864 ( the mercury boat). The wreck is assumed by the Norwegian Maritime museum to be of U-486 which was sunk by  the British submarine HMS Tapir April 12 1945. U 486 was delivered from Deutsche Werft March 22. 1944. She is reported to have sunk the troopcarrier Leopoldville where 800 US soliders lost their life 2 Royal Navy frigates were on her sinkinglist as well.
Tore

[NZSnowman]

Tore, extreme piping!

Here is the layout for just the 3 pipes that you can see below P14/13 = Orange; P14/5 = Red &  P14/6 = Blue)




Fig. 1. Three pipes and torsional vibration damper cover.


Fig. 2. Torsional vibration damper cover remove.


Fig. 3. I have remove the Orange pipe and some of the LO lines so you can see how the blue lines connects to the valves.


Fig. 4. I have remove all but the red lines.

[tore]

Simon.
Your pipe system seems to be OK to me. Just a matter of days before we can start up!
Tore

[tore]

Off topics.
U 486.
Further to my report of the find of U 486 follows a photo of the wreck and crew as well as SS Leopoldville which she torpedoed Christmas eve 1944. The troopship sank slowly (2 1/2 hours) in spite of that and due to holyday leaves,  rescue vessels without crew and mishandling almost 800 US troops lost unfortunately their lives.
Tore

[NZSnowman]

Next few pipes...

Pink = LO Cooler to Coll & Dist Manifold
Violet = Runs toward the pump (which I can not remember it name).
Green = from LO pump to pink line.
Yellow = from reducing valve to Green line.

[NZSnowman]

Simon.
Your pipe system seems to be OK to me. Just a matter of days before we can start up!
Tore

High pressure air starting system hookup and ready 

[tore]

Simon.
Don`t forget the handle on the starting air wheel!
Tore

[tore]

Simon.
Pipes.
Your new supply of spaghetti seems to me to be OK . One question though . On the pipe layout plate you have correctly placed the violet pipeline outboard and to the governorservo for the fuelrack. However before entering the servo you have two branch off to the Roots blower. Have you found these branch off pipes on some photos or drawings? The reason for the question is that this violet pipe is shortcutting the reducing valve 3>1.5 atu in order to supply the servo with oilpressure of 3 atu whereas the luboil pressure should be 1.5 atu. The lubrication points on the Roots blower are four bearings and the gear/timing gear,plus clutch which really do not need higher pressure than the rest of the lubrication points of the engine.
Tore

[NZSnowman]

Tore, yes I have a photo (below). You can clearly see the two lines to the Roots blower.