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Author Topic: Oxygenating Wort with Oxygen  (Read 566 times)

August 13, 2020, 10:45:02 AM

DanWalters

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Oxygenating Wort with Oxygen
« on: August 13, 2020, 10:45:02 AM »
This information has been put together by Lee Immins from London Amateur Brewers and with his permission I thought it would be useful to share:

Dan and the team
Here are my notes on oxygen set up
Some background reading :
https:/byo.com/article/aerating-wort-techniques/
https://www.nationalhomebrewclub.ie/wordpress/2013/10/oxygenating-wort-with-pure-oxygen/

And notes comparing the two set ups Ive used

So for oxygenation you need an source of oxygen, a regulator, a connector, ideally a flow meter, some 3/8” beer line tubing (or metal) and a sintered stone (see pic 3485).

There are two options I’ve looked at/used

Oxyturbo disposable cylinders:
These are available in shops or online and can be posted by courier. They are single use. They are sold fairly widely (they are used for welding) and you can get them for about £20 if you buy a few at time and shop around. Here is one: https://www.welduk.com/product/oxyturbo-480300-oxygen-gas-cylinder/, They are 1 litre capacity and 110bars, so about 110 litres of oxygen.

Roughly – 5 (US) gallon brew of normal strength beer takes 1l/min for 1 minute, twice as long for strong beers. So this should do you 50-100 beers but in reality it was somewhat less than that. A good 30 at least (but I do make 33 litre batches). I did sometimes use it on starters, and for strong worts you can re oxygenate after 12-24 hours.

Regulators are £25: https://www.welduk.com/product/regulator-disposable-oxygen-cylinder/ or £35 with gauge: https://www.welduk.com/product/regulator-gauge-for-disposable-oxygen-cylinder/

They come with a small barb which you might fit some line on directly. Or, there is a JG fitting you can buy, cut off a little of the thread, and it screws on directly. See image 3483. I hear the guage one takes a JG fitting without any need to saw a bit off

You can just run the oxygen so you can just see bubbles when you dip the sintered stone in liquid. But its better to have a flow meter. There are ones that have a valve (£9) or ones that don’t (cheaper). You want it to show up to 2l/min (my first one went 0-5litres). It should be for oxygen, although Argon is close enough for what were doing. See pic 3486. The one on the right is much better than the one on the left in terms of build and the smaller range. Both available on E Bay

Plus – easy to order, no deposit, small and compact

Negatives – need something to hold the tank upright really (I used a sawn off measuring cylinder), expensive oxygen

Larger refillable tanks

Available from welding suppliers, I got mine via Adams here: https://www.adamsgas.co.uk/product-category/hobby-welding-gas/

So these cost £46 a refill. They are 10 litre 200 bar – the same as 18 disposable cylinders (for the price of 2 of them).
However, you have to stump up a (refundable) deposit (maybe £55) and delivery (£12 – but if youre getting CO2 anyway..)

A single stage regulator is sufficient and costs about £27 (so same as the disposable one): https://www.amazon.co.uk/Parweld-Oxygen-Gauge-Single-Regulator/dp/B00NQUSTFE/ref=sr_1_1_sspa?dchild=1&keywords=oxygen+regulator&qid=1594221946&sr=8-1-spons&psc=1&smid=A3Q5UZ2VG3Y2M5&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExR1dTTzc0RlBZVzNZJmVuY3J5cHRlZElkPUEwOTMzODI2Mk1GQ0sxM05XMkxXOSZlbmNyeXB0ZWRBZElkPUEwMjY1MTA5MUZQUDNEQjU1VDcyNiZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

The output is a 3/8 bsp thread so a simple JG connector to 3/8 line works nicely. You still need See pic 3482.

Again up to you if you use a flow meter but as the pressure is much higher I think you’d be wise to get one. You can skip that on the disposables (but then you might dump the whole bottle into a brew like Fraser did – so could be false economy). You can buy an Argon flow meter that will screw straight into the 3/8 thread so everything is neat and fixed to the regulator like this, but try and find one that has the right flow range (1-2 litres per minute): https://www.zoro.co.uk/shop/welding-brazing-and-soldering/flowmeters-and-economisers/1242-flowmeter-argon-0-14-lpm/p/ZT1000015X?utm_source=google&utm_campaign=pla%2B%7C%2BWelding%2C%20Brazing%20%26%20Soldering&utm_term=ZT1000015X&utm_medium=pla_css_3&mkwid=-dc&pcrid=314501950711&pkw=&pmt=&prodid=ZT1000015X&slid=&pgrid=%7bgroupid%7d&ptaid=pla-392640320780&gclid=EAIaIQobChMI47z1oLHR6gIViLbtCh08YASkEAQYAiABEgKYGvD_BwE

Plus – works out cheaper over maybe 3-5 years, even if you write off the deposit. Tank stands up

Negatives – takes up more room, higher initial outlay.

For both, the oxygen isn’t claimed as food grade, but it often comes from exact the same tank as medical oxygen, it just isn’t tested. Some say its worth fitting an inline filter just to catch any oil or particles etc.

I dip the sintered stone in some hot citric acid after each use to ensure it doesn’t clog up with chalk from the water (that did happen initial) and then sanitise the outside of that and the tubing with Starsan. The pure oxygen should kill anything on the inside.

Final point is that its easier with a conical to use flexible beer line and feed it in through the centre port on the lid, but you can use a metal wand for buckets or small plastic vessels etc.

I think I will try and find a place to site the tank and then run permanent tubing to where I need it, with the flow meter then fixed close to use. Then just plug in the flexible/detachable line/stone when needed.

Cheers

Dan
Fermenting: Session IPA
Conditioning: Milk Stout
Planning: All Together IPA, Dunkel Weiss, Belgian Dark Ale, West Coast IPA
Drinking: Old Speckled Hen Clone, Rum & Vanilla Imperial Porter

 

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