Clever priming sugar required

[RoomWithABrew]

Fill one corny keg with sanitiser, use the ferment gas to purge the sanitiser out of one corny into the other and then purge that one as well.
You then have two kegs with no oxygen in.
Bringing another option into the room closed inject sugar mix ( half the amount for bottling carbonation ) and one gramme of Ascorbic acid into each keg.
Then closed transfer of beer into each keg.

Result two half filled kegs, no oxidation, building pressure from priming and only a need to supplement the volume of beer lost with equal CO2.

If you are trying to get rid of the CO2 cylinder you could fill one keg fully with the above method and then the other keg with some sugar, yeast nutrient and then use this ferment gas connected gas to gas periodically as your source of clean CO2.
Use an inline mini reg between the two kegs as your pressure control system or wing it using a simple connection and check with a pressure gauge.

 

[RoomWithABrew]

And I've proven that calculator to be inaccurate. There should be a discussion on there between me and the site owner. For my calculation and actual result, it was out by over 100%.

For a 12psi 10 second pour, it gave me 0.9m of 4mm ID hose. I'm actually using 2.5m.

I'd take it up with https://www.mikesoltys.com/

It's his PhD that calculator is based on.

You don't say what temperature your beer is at for your 12 psi.

But this thread might be a good starting point for your issues,

https://www.homebrewtalk.com/threads/critique-of-mike-soltys-hose-length-calculator.652483/

 

[Davegase]

I do now, from your links, know how to work out the required pressure. Then some smartass started on about oxidisation which lead to venting. So need more fermentation gas fot that too now.

I don't believe you have a pressure fermenter.
I've used fermentation gas during pressurized fermentation to purge kegs filled with sanitizer.
Then do a closed transfer oxygen free.
Pressure fermentation is another rabbit hole to go down.

 

[Buffers brewery]

I do like a good rabbit hole

 

[Larse]

I'd take it up with https://www.mikesoltys.com/

It's his PhD that calculator is based on.

You don't say what temperature your beer is at for your 12 psi.

But this thread might be a good starting point for your issues,

https://www.homebrewtalk.com/threads/critique-of-mike-soltys-hose-length-calculator.652483/

Temperature doesn't matter if it's the same in both scenarios. But for the record it was 2°.

And the calculator is definitely wrong. I tested against it with two different hose IDs. There are other calculators out there that are closer to reality. The one on kegerators.com for instance.

Replacing all the beer lines on your kegerator isn't a fun task. I was spitting feathers when I had to do it a second time. I did it twice in a month because that calculator was wrong. So Mike Soltys can take his PhD and put it where the sun don't shine.