[PSUBS-MAILIST] right side up compensator

[Øystein Skarholm via Personal_Submersibles]

Again, NEVER open the oil to contact the seawater. You WILL get water into
the oil! Have the oil closed. Unless you have a piston in your riser tube,
the air will flow straight out and water will come i.
[image: image.png]
The idea to the left.....and the result to the right. Just trust me on
this.
The below picture shows one of the ROV I have built. The canister in the
center contains computers and power supply ++ 600Volt DC
The whole canister is filled with Shell Diala S4 oil (In the progress of
changing to MIDEL ( Not so aggressive to the rubber and plastic parts.
I use a small bladder compensator for this (its far too big really, but
came cheap off the shelve from an auto dealer shop) The little tee lets me
inject oil through a check valve
until I get 0,2bar overpressure. The red cap in the end lid is the main
filling bulkhead.



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lør. 28. mar. 2020 kl. 15:14 skrev Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org>:

> I'm thinking we need someone to give a technical talk on this at our next
> convention.  I'm not only confused but I guessing others are as well.  I
> thought the simplest approach, from previous discussions, was just to use a
> length of hose connected to the oil filled motor on one end and open to
> water on the other end.  See attachment.  This allows expansion of oil into
> the hose (blue), but traps a gap of air (white) as water (green) enters the
> hose during a dive.  Water compresses the trapped air the deeper you go, so
> designing a large enough gap is important because that air gap can get
> quite small and potentially result in mixing of the oil and water.  At 300
> feet for example, the air gap is only .652 inches (16.5mm) when using a 30
> foot (9 meter) hose.
>
> My understanding for the need of a bladder is in a closed system, meaning
> no hose open to the water, to have an expansion point (the bladder) for any
> increased oil volume due to heat whether it be motor operation or just
> sitting in the sun while out of the water.
>
> Jon
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>


-- 
Vennlig hilsen
Øystein Skarholm
91369599
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