Autoclave/Pressure cooker

[Belter]

I'm also on my phone am I talking to you from the future?

[Goulders]

Couldn't see you were from cornwall on tapatalk

Anyway - happy hunting for a pressure cooker

[Belter]

Managed to pick this little beauty up from the Carboot this morning. £6



Yeast ranching is a go

[Goulders]

Excellent! Good luck

[Belter]

Cheers! Holds pressure and is big enough for quite a bit. I've had a few rethinks after your advice above and watching videos on youtube about heating starters, equipment etc. Thanks for your help and advice mate.

[Belter]

As mentioned on my other thread the Pressure cooker needs to reach 15psi to autoclave. My pressure cooker will on reach 11.6psi.

Can I do it for longer... some sources say it isn't a case of just doing it for longer. Therefore is this not fit for purpose or perfectly serviceable?

Gregorach seems to think it will still be better than boiling alone?
viewtopic.php?f=12&t=56337&p=591891&hil ... si#p591891

[Lars]

As mentioned on my other thread the Pressure cooker needs to reach 15psi to autoclave. My pressure cooker will on reach 11.6psi.

Can I do it for longer... some sources say it isn't a case of just doing it for longer. Therefore is this not fit for purpose or perfectly serviceable?

Gregorach seems to think it will still be better than boiling alone?
viewtopic.php?f=12&t=56337&p=591891&hil ... si#p591891

I researched this quite a bit when setting myself up for yeast ranching and apparently 15psi is the magic number required for autoclaving. That said, I would certainly agree that 11psi is better than just boiling. I ended up paying about €60 in Argos for a prestige, this one I think http://www.argos.co.uk/m/static/Product ... 610351.htm
From what I've read, less than 15psi won't kill spores in the liquid. Storing a small yeast colony like a slant for a long time, you then have to nurse it back to full health by stepping up to starter size with an initially lower gravity wort, if theres any bacteria in there your going to be giving that every opportunity to grow as well. its not quite like making a starter with a vial of healthy yeast where any bacteria has to compete with a huge colony of healthy yeast. It would be a shame to go to all that trouble if your initial sterilisation failed.that said, you may never have a problem

[Matt12398]

What temperature will you get with with the psi you can reach?

[Belter]

What temperature will you get with with the psi you can reach?

117 degrees Celsius

[darkonnis]

I seem to recall from reading yeast (if you havent got it and are attempting this, then stop what you're doing and go and buy it or you're wasting your time) is that a pressure cooker is fine for any amount of slants starts etc that we may do as home brewers, sterilisation is a case of set heat pressure for a given time, it does give you the times in the book for a set temperature. I'll see if i can find it, but it is there i'm certain

[Goulders]

The times from yeast are 15 mins at 121c or 3 mins at 134c. You dont need the yeast book, alhough a good read. Wolfy's thread is great with some good links. He use to syerilise without a pressure cooker and while 15psi is supposedly best, on a small scale you will have success with the cooker you have. You may as well have a go with what you have and keep a look out in free ads or iher car boot sales and spend the 45 quid for a new one on getting vials etc

[darkonnis]

Each to their own of course, but the men started white labs. To not have their book which pretty much sums up every and all questions/problems you may encounter for the full process seems like madness. (considering if you bugger it up, it'll cost you a bit more than the £8 the book cost). Wolfies thread is pretty epic, but its one of the few thorough (and very accurate/good) threads on the subject.

[Goulders]

Not doubting what you say darkonnis; I have the book. But wolfie's thread as you say is 'epic'. I think there is a link to some guy who has his own lab and sets out what you need etc.

[Belter]

I have yeast and have read it. I'll get it back from my bro and have a re-read

[Belter]

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