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BOD's Easy AF how to use your pressure cooker for mycology TEK * 146
    #24180711 - 03/21/17 03:07 PM (6 years, 10 months ago)

This tek is part of bod's cultivation is easy as fuck link list



Bod's Pressure Cooker Use TEK
how to run a jiggle weight pressure cooker quietly and with littler water loss


Quote:

bodhisatta said:
Use of a Presto Pressure Cooker








Cultivation Videos

I strongly recommend the Presto 23 quart pressure cooker (pressure canner)
Presto 01781 23-Quart Pressure Canner and Cooker

It will hold 10 Quart jars
How you ask?
7 on the bottom and 3 on top
Wide mouth jars fit this way

Narrow mouth jars fit this way


The 16 quart Presto model will only hold 7 Quart jars.
Presto 01745 16-Quart pressure Canner and Cooker

The manual for the presto 23q says it only holds 7 jars. Because they would never tell you to put jars on their side. It's fine for our spawn jars and this way you can get 10 done in a run.


Other Pressure Cookers work, You can use All American brand stereoclave/autoclave/sterilizers/pressure cookers. Or any other size cooker of any brand mirro or presto, etc...

I personally would rather buy a few more 23q prestos than buying an AA. AA makes an amazing product that holds its value. They also look like bombs, are heavier, and cost a fortune up front. If you need the bling factor get an AA.

This TEK will cover the use of pressure cooker/canners that use a jiggle type weight on top.
Sterilizers use a toggle valve to release over-pressure. AA canners can be turned into sterilizers by replacing the jiggle weight with a toggle.(click for example)

Some sterilizers also have built in heating elements. Thus being able to be used anywhere that has a power outlet. AA makes sterilizers with built in elements. They're pretty fucking badass.

First Things First

Read the user manual for your pressure cooker

You can find the PDF for the presto models on their website
https://www.gopresto.com/products/products.php?stock=01781


Water Level

The presto 23q says to use 3 quarts of water. This may seem like a lot of water but it's fine, DO IT. Your pressure cooker may say to use more or less water depending how big or small it is.

In addition to the water you add you'll want to add 1-2 tablespoons of white distilled vinegar. This will make your jars come out looking sparkling clean rather than white and dingy from the hard water deposits.

Ideally you would use distilled water but who is going to buy jugs of distilled just to run their pressure cooker, Tap water works fine with the vinegar trick. I use very hot tap water to fill my cooker. Routine maintenance means I never worry about mineral deposits or hard water problems.

Obviously, The cleaner or more filtered your water the better, less mineral deposits, less corrosion that you'll have to clean etc...
you could also use an electric kettle or microwave to pre-heat the filtered or distilled water to speed things up


here's 3 quarts of water in a presto 23

here's where it comes up to on the first layer of jars

Later on I explain the importance of venting, it's very important. Because we do not want trapped air in the pressure cooker I ensure I leave no air bubbles from the space under the jars
here's how

put these jars in first leaving the 7th jar to go in on the side not the center.

tilt the jars into the water so there's no air bubble trapped beneath them. practice with empty jars if you have to see the bubble and how to get it out.

when you get to the 7th jar like in the above picture tilt that one as well and do your best to get the air bubble out.

then you can put the other 3 jars on top



The Trivet


every cooker should come with one of these, otherwise you'll want to buy one that fits in your cooker.

Above I said to use the recommended water level, With the presto 23 that's 3 quarts of water.

If you put 7 quart jars in the bottom the water will come just under half way up the side of the jar, This is fine.

As long as half of your jar is above water there's sufficient contact surface for STEAM. STEAM is what does the sterilization you want your jars to have at least 50% of their surface above the water so that steam can transfer energy to the jars.

Say you only want to sterilize a few jars or a bottle of agar. You put the jar(s) in your presto 23q cooker and put 3 quarts of water in. You'll find out the jar(s) start to float or wont sit on the trivet. This doesn't mean you should use less water. It means you need to raise your trivet up.

The best way to raise the trivet is to put some balls of foil, jar lids, etc... anything that wont melt and can stay in a pressure cooker during a cycle. With the trivet raised up your jars will not float away when you're only trying to sterilize a few things at once.

For example pasty plates(clickable link) will require you to raise the trivet up otherwise they'll float around and tip over during the cycle.

The Gasket

Most pressure cookers use a rubber gasket to seal the lid to the bottom.
These gaskets will easily last 3 or more years of routine weekly use if maintained. Regardless it's less than 10 dollars for a replacement so even if you destroy it after 2 years it's dirt cheap.

Every cycle remove the gasket and inspect it for cracks or other defects.

Stretch the gasket out a little bit using your hands by pulling on it. While you're gently stretching the gasket have a little mineral oil or petroleum jelly on your hands to slightly lubricate the gasket (Petroleum jelly isn't recommended for rubber but well it fucking works great)

The best option would be silicone oil which can be found in the plumbing section. This will not deteriorate the rubber at all.

Gently put the gasket back into the lid. Then put the lid on the cooker as per instructions.

Starting Up the Cycle: Venting


My thread dedicated to the importance of venting. Yes it deserved it's very own extra thread

I usually will use very hot tap water or near boiling water to fill the pressure cooker.

Once the lid is on MAKE SURE the weight is OFF. Turn the heat to high

Once it starts to boil you'll see steam coming out of the top of the lid. After a minute or two the safety plug and the locking mechanism will pop up, at this time you will not be able to remove the lid unless you kill the heat and let the safety valve drop back down.

Once steam comes out of the top set a timer for 10 minutes. NO LESS

https://en.wikipedia.org/wiki/Partial_pressure
You don't want to pressurize AIR you want to pressurize water vapor/steam

if you do not properly vent there will be air trapped in your jars still and in the void space in the cooker. Your gauge will eventually read 15psi but if you know anything about partial pressure you will not actually be at 15psi of steam pressure but X psi of steam and Y psi of air where X+Y=15. This means you're sterilizing at a lower temperature than expected. In a static volume each gas in a mixture exerts the pressure it would as if it were the only gas in that volume. All of these partial pressures add up to the total pressure you see on the gauge. This is Dalton's law of partial pressure.





as you can see from the graphs at 1bar or 15psig 100% steam is 121C or 250F

Say you still have 10% air left from improper venting. If your gauge reads 15psi you're actually at ~116.5C or ~242F. Not only that but it actually makes the steam transfer heat less effectively so it's a compounded problem

if you can imagine the jars are filled with air(let alone the volume of the PC), this needs a good 10 minutes to escape. As the heat increases in the cooker, the grains will start to evaporate/boil their moisture and push the air out through the filters/lids of your jars. The whole volume of void space in jars and in your PC needs to be filled with water vapor/steam. Since there's no way to test this we vent at least 10 minutes.

Starting Up the Cycle: Pressurizing


once you've vented for 10 minutes you may notice that you're at a few PSI on the gauge. That's no problem.

Put your weight on and you'll start to see the needle rise. I leave the cooker on high to medium-high during this stage.


There's many different shapes and kinds of weights, yours may not look like that one.

As soon as the pressure gets close to 15 you will need to turn the stove down to maintain pressure. If you leave the stove on too high the weight will jiggle, make noise, you'll lose water more quickly as well. You only need the stove hot enough to MAINTAIN the pressure.

I put 3 quarters (15-18 grams) of weight on top of my jiggle weight.
I simply used some tape and put them right on top

This is how I run my pressure cooker quietly and with very little water loss.

The cooker is designed so that the weight jiggles at 15psi and we're trying to sterilize at 15psi. So with no added weight the weight will jiggle and make noise the whole cycle. Fuck that.

If you add a little weight to the jiggle weight. Then you can leave your pressure cooker at 15psi by adjustment of the heat and it will not jiggle. The added weight makes jiggling at 18-19psi so as long as you run it at 15-18psi it will be nearly silent and you'll lose almost no water.



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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: JewishLawyer] * 10
    #24180836 - 03/21/17 03:51 PM (6 years, 10 months ago)

I'm the even if I had a million dollars I still wouldn't buy things that cost too much for what they're worth.


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: mushboy] * 4
    #24180924 - 03/21/17 04:19 PM (6 years, 10 months ago)

Petroleum jelly is like a solvent to rubber so it degrades them over time. Regardless the gaskets last a long time and are really cheap. And the jelly isn't destroying mine :shrug:

@ jewishlawyer
There's no way
Either you don't have a presto 23 or your jars are not quarts


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: JewishLawyer] * 2
    #24180989 - 03/21/17 04:41 PM (6 years, 10 months ago)

There's something up there's no way to get more than 7 quart jars per layer


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: JewishLawyer] * 2
    #24181009 - 03/21/17 04:48 PM (6 years, 10 months ago)

Pint and a half?

Looking at those pictures is like some David Blane shit


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: Germs] * 2
    #24181874 - 03/21/17 10:03 PM (6 years, 10 months ago)

If you have oring lube or any actual suitable rubber gasket lube use that. If not petroleum jelly, regardless of not being recommended, works just fine in my experience


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: Dactylium]
    #24182078 - 03/22/17 12:03 AM (6 years, 10 months ago)

Quote:

Dactylium said:
I've got a Mirro pressure cooker I didn't bother to read the instructions for because I was a stoner moron taking a PATHETIC stab at the PF tek. If this changes my contam rates when I use oats I'm gonna shit.



I imagine it will lol.


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: wowimflabbergasted]
    #24182443 - 03/22/17 07:47 AM (6 years, 10 months ago)

Quote:

TheMadHatter420 said:
Bodhi, how many years of this hobby you got under your belt?



4
Quote:

Sterben said:
& now i know the secret to getting that TC badge.:raisemyglass:



:cheers:

Quote:

wowimflabbergasted said:
Good stuff bod!! I like the breakdowns and especially the venting section. That's not explained often and I've been guilty of pressurizing too soon before :lol:





Dalton's partial pressure law


If you have say 50% air still trapped in the pressure cooker youll see 15 on the gauge but the temperature will only be 220F rather than 250F


Actually to sterilize a syringe that's filled with liquid and not have it all come out during the cycle they use an air steam mix cycle.

It will be 15psi of steam and 250F but they inject compressed air in to raise the pressure to 30+ then slowly lower the pressure at the end of the cycle.



Edited by bodhisatta (03/22/17 08:00 AM)


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: Chk]
    #24183352 - 03/22/17 01:40 PM (6 years, 10 months ago)

Yes it does. You can find it in the plumbing section of hardware stores


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: bodhisatta]
    #24184047 - 03/22/17 05:34 PM (6 years, 10 months ago)



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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: shumer44] * 1
    #24184586 - 03/22/17 09:46 PM (6 years, 10 months ago)

Quote:

shumer44 said:
Another video I found on Youtube with same canner..





Meh, no where near as awesome


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: georgeballer]
    #24211760 - 04/01/17 07:43 PM (6 years, 9 months ago)

I use foil so the lids stay sterile till i remove the foil in the sab

Rings loose enough to not piss you off later


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: The_breadsticks]
    #24237639 - 04/12/17 02:08 PM (6 years, 9 months ago)

:rofl:
Counter intuitive jar arrangements


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: The_breadsticks]
    #24237661 - 04/12/17 02:15 PM (6 years, 9 months ago)

Munch blenderless li?


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: Gorlami]
    #24254887 - 04/18/17 04:35 PM (6 years, 9 months ago)

updated with some info about how to load your jars without a bubble of air under them because I guess it's probably not common sense


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: OfTheVoid46]
    #24255380 - 04/18/17 08:32 PM (6 years, 9 months ago)

Hot water is fine. If your shit builds up that terrible that under a gallon of water causes you buildup so bad it warrants cleaning you got other issues.

I also say distilled is best just like your manual says. Furthermore This is how to use your cooker for mycology purpose not for canning or making food.

And lastly you can boil up distilled or cold water (because of your scale issues) in a microwave or electric kettle to speed things up.


Edited by bodhisatta (04/18/17 09:53 PM)


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: gphantom]
    #24259619 - 04/20/17 01:01 PM (6 years, 9 months ago)

Those numbers are in the teks for the things that go in the cooker. Like your cake tek, spawn grain teks, agar Tek, etc..


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: SuperLuigi]
    #24268078 - 04/24/17 08:56 AM (6 years, 9 months ago)

Yep already been said a few times


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: bodhisatta]
    #24271014 - 04/25/17 03:45 PM (6 years, 8 months ago)

bump


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Re: Bod's Easy AF how to use your pressure cooker for mycology TEK [Re: KKVguitarist]
    #24301993 - 05/07/17 10:12 AM (6 years, 8 months ago)

Quote:

KKVguitarist said:
Wow bod i just saw this for the first time i had no idea about venting. Thank you for providing this ill now know how to use my pc properly. I wish i could do your quarter trick but i dont have a pressure gauge on any of my pcs. I suppose i could start i get it to where its barely rattling at 15psi then put em on but i dont wanna chance popping the plug. What do you think



What's the plug rated for?
If in doubt don't mess with a kitchen bomb.


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