So I want to run my ideas passed you all for how I'm going to seal the cables in.
One concern I've had about this is that with mineral oil submersion builds a small amount of oil tracks out by capillarity, mainly from the monitor cable.
Obviously I'm concerned about the reverse happening and air being pulled into the chamber because of the negative pressure.
So I'm thinking of running cable extenders through the chamber wall, the cables will terminate in a secondary small chamber stuck on the outside of the main chamber wall.
This secondary chamber will be full of butane gas and attached by a hose to the butane filled collapsible purging sac and so at atmospheric pressure.
These cable extenders will be joined to the proper cables that then exit the secondary chamber and are sealed into that.
So basically the connection between the extenders and the main cable represents a break in the cable sheathing, no pull through will occur from the atmosphere into the secondary chamber as that is kept at atmospheric pressure by the butane filled collapsible purge sac and any pull through that occurs from the secondary chamber into the primary chamber will be butane and not air.
Sorry if that sounds complicated....I'll stick a sketch up shortly.
I'm not sure if I need to do this procedure with all the cables, certainly the monitor cable and lan/ehternet cable will require it. Not sure about usb, sata and fibre optic cables.
Also not sure about the power cables and similar cables with braided wire copper cores, I don't really want to do this with the psu cables as it will involve too many connections and voltage drop as a result ( that's why I was asking about putting the psu in the chamber). I would think that single braided core cables will probably be alright as the resistance to air movement along a length of those would be considerable and so any air entry minimal.
I think the main problems will come from cables that contain several smaller cables where the plastic sheathing around those may contain channels.......to save on too many connections....which may cause a problem with sata and usb I may consider just stripping away the outer sheath on a small section of the cable inside the secondary chamber so as to form a "break" instead of a connection?
Sorry for the edits but I am sound-boarding atm.....I could even dispense with the secondary chamber altogether and just strip the outer case off the cables at the point where they are sealed into the main chamber wall.....that would work...but I'll have to strip a few cables first to see if that is feasible....would certainly save a lot of work.
I may be being a little OTT but I think I'll try to inject the larger braided core power wires with something like this if I can get it to flow through a hypodermic needle.
http://www.ebay.co.uk/itm/CREEPING-CRACK-CURE-leaking-water-leak-sealer-caravan-boat-windows-decks-seals-/141031827140#vi-contentEdited by technogiant - 8/11/13 at 12:15am