[PSUBS-MAILIST] right side up compensator

[Øystein Skarholm via Personal_Submersibles]

For info if any interest
[image: image.png]
Hope I used the correct feet to meter conversion :-)

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lør. 28. mar. 2020 kl. 19:57 skrev Øystein Skarholm <skarholm at gmail.com>:

> 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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>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>
>
>
> --
> Vennlig hilsen
> Øystein Skarholm
> 91369599
>


-- 
Vennlig hilsen
Øystein Skarholm
91369599
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