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Offlinek4ge
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Jars touching in pressure cooker.
    #13071169 - 08/18/10 09:28 PM (14 years, 4 months ago)

I know if jars touch in the pressure cooker they will crack.... but if I put a cloth or tinfoil between them will that act enough of a barrier to stop the cracking?


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OfflineMaharishi_2_U
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Re: Jars touching in pressure cooker. [Re: k4ge]
    #13071204 - 08/18/10 09:36 PM (14 years, 4 months ago)

Y jars almost always touch, never cracked ONE.

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OfflineMycjunky
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Re: Jars touching in pressure cooker. [Re: k4ge]
    #13071208 - 08/18/10 09:37 PM (14 years, 4 months ago)

I always used to just put my jars in with nothing in between them. Don't know where you heard this but I've never had a single jar crack out of like 300+

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OfflineScavengerType
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Re: Jars touching in pressure cooker. [Re: k4ge]
    #13071209 - 08/18/10 09:37 PM (14 years, 4 months ago)

it shouldn't cause them to crack. My jars touch all the time. It' no big deal.


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"Have you ever seen what happens when a grenade goes off in a school? Do you really know what you’re doing when you order shock and awe? Are you prepared to kneel beside a dying soldier and tell him why he went to Iraq, or why he went to any war?"
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Invisiblefreespeech
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Re: Jars touching in pressure cooker. [Re: Maharishi_2_U]
    #13071212 - 08/18/10 09:37 PM (14 years, 4 months ago)

Quote:

boredcertified said:
Y jars almost always touch, never cracked ONE.




:thumbup::thumbup:

Jars can be touching, stacked, laying on top of each other... it doesn't matter as long as there is space for steam to permeate most of the surface area. Not a problem since the jars are rounded.

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Offlinek4ge
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Re: Jars touching in pressure cooker. [Re: freespeech]
    #13071232 - 08/18/10 09:42 PM (14 years, 4 months ago)

:S strange, In my last batch I had 3 jars crack, first jars ever and my first time to ever have jars touching.  What would have caused my cracked jars?


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OfflineScavengerType
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Re: Jars touching in pressure cooker. [Re: k4ge]
    #13071240 - 08/18/10 09:45 PM (14 years, 4 months ago)

if you vented the pressure rather than letting it cool to 0 it could cause this. Using non-canning jars could do it too.


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"Have you ever seen what happens when a grenade goes off in a school? Do you really know what you’re doing when you order shock and awe? Are you prepared to kneel beside a dying soldier and tell him why he went to Iraq, or why he went to any war?"
"The things that are done in the name of the shareholder are, to me, as terrifying as the things that are done—dare I say it—in the name of God. Montesquieu said, "There have never been so many civil wars as in the Kingdom of God." And I begin to feel that’s true. The shareholder is the excuse for everything."
- Author and former M6/M5 agent John le Carré on Democracy Now.
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OfflinehamloafM
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Re: Jars touching in pressure cooker. [Re: k4ge]
    #13071261 - 08/18/10 09:50 PM (14 years, 4 months ago)

When you pulled your jars out of the PC and noticed they were cracked, did you happen to notice the water content inside of your PC?  Was there water left inside the PC or was it dry.  Did you notice towards the end of the PC cycle if your PC became quieter than normal?
LM


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How I Get Stuff done. - My Reference Guide. - My Grows.

Edited by LiquidMyce (08/18/10 09:57 PM)

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Offlinerustycobwebs
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Re: Jars touching in pressure cooker. [Re: hamloaf]
    #13071287 - 08/18/10 09:55 PM (14 years, 4 months ago)

i hate to ask but did you elevate your jars off the bottom of the pc/pot? Had to ask.

Yea, quick cooling is a bad idea.


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and let it be so Praise Psilocybe

Edited by rustycobwebs (08/18/10 09:56 PM)

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Offlinek4ge
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Re: Jars touching in pressure cooker. [Re: hamloaf]
    #13071336 - 08/18/10 10:07 PM (14 years, 4 months ago)

I had a rack, there was water left after PCing, and I didn't speed cool my pressure cooker.  After pressure cooking U just put it outside overnight.


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Offlinerustycobwebs
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Re: Jars touching in pressure cooker. [Re: rustycobwebs]
    #13071355 - 08/18/10 10:10 PM (14 years, 4 months ago)

odd.  proper canning jars everything good there? Maybe they were extra old? Don't know if they really wear out though....

You usually separate your jars? Maybe it's some freak OCD pressure cooker?


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and let it be so Praise Psilocybe

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Offlinecloudwalker
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Re: Jars touching in pressure cooker. [Re: rustycobwebs]
    #13071383 - 08/18/10 10:17 PM (14 years, 4 months ago)

Maybe they were just bad jars?  :shrug:

Edited by cloudwalker (08/18/10 10:35 PM)

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Invisiblefreespeech
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Re: Jars touching in pressure cooker. [Re: k4ge]
    #13071441 - 08/18/10 10:30 PM (14 years, 4 months ago)

Quote:

k4ge said:
I had a rack, there was water left after PCing, and I didn't speed cool my pressure cooker.  After pressure cooking U just put it outside overnight.




You put it outside overnight? Why? Maybe that is a problem. How cold does it get at night?

When you're done PCing, just turn off the stove and walk away.

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Offlinerave420
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Re: Jars touching in pressure cooker. [Re: freespeech]
    #13071897 - 08/19/10 12:56 AM (14 years, 4 months ago)

listen to all these guys here :laugh:

now i don't recommend anybody to follow my examples here but...
When i cook jars of any kind, as soon as the time is up i take the pressure cooker off the stove and place it on my linoleum concrete floor. 10 - 30 minutes from that point on the pressure returns to zero and the valve that seals the pressure cooker drops. It's now safe to open (according to my German manual that came with it, and they know what they're talking about :wink:) . I put on some silicone gloves and place the jars into a safe place to cool, such as a shelf. I also immediately remove the foil from the jars. I then load up more jars and cook another batch.

The whole cooling down thing overnight etc. is overrated in my opinion. As long as the pressure cooker can SLOWLY drop below 100C and you wait until pressure returns to normal (it should stop boiling a while ago) there is nothing you have to be afraid of. Be mindful that when working with closed jars that the jars themselves might be under pressure, and that they can continue to boil long after they are out of the pressure cooker. This is due to the vacuum inside the jars which lowers the boiling point of liquid. I get this when making LC's a lot.

And of course everything you are handling is HOT. Jars for canning are made to withstand pressures that are created by pressure cookers. Furthermore, a jar comming out of a pressure cooker would not explode "and rain hell all over you", it would merely implode if still under vacuum. This can still suck when you spill hot liquid on yourself. I always wear a wax apron for that very reason when doing PC orgy's.

I aid my pressure cooker in cooling down by placing it on a deep concrete floor, which transfers heat away from the large metal base a lot better than a stove top element. I feel that this is a safe process. Anything involving cooling the PC with water etc. just screams for trouble though.

The only time i had a jar crack was when i placed jars into the PC in the 2nd cycle when the PC was still hot. It would hit boiling way too fast, and my LC jars just died right there. I now avoid this by placing the jars into the PC and waiting 15 minutes before starting up again.

Then again, i grew up in a household where the pressure cooker was used extensively for canning and food preparation, and my parents NEVER EVER let their food from the pressure cooker cool down before serving it :wink: They would even forcefully release the steam, slowly, but they would. They'd call us to table, we would sit down and dad hauled a whistling pressure cooker from the stove to the table. We would wait a bit and then mom would release the steam and serve us all a portion. So much for exploding pressure cookers.


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Offlinecookie dude
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Re: Jars touching in pressure cooker. [Re: rave420]
    #13072326 - 08/19/10 06:21 AM (14 years, 4 months ago)

The instructions for my pressure cooker tell you to "Quick cool"  it by  placing it under a running tap, After about 20 seconds the valve drops down letting you know all the pressure has been released and its safe to open.

My Mom has cooked our Sunday dinner like this for over 30 year with the same pressure cooker and never had any problems.

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InvisibleDoc_T
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Re: Jars touching in pressure cooker. [Re: cookie dude]
    #13072334 - 08/19/10 06:26 AM (14 years, 4 months ago)

Never, ever do that when sterilizing jars. Always allow the device to cool to zero pressure naturally.


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OfflineJonnyBtreed
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Re: Jars touching in pressure cooker. [Re: rave420]
    #13072383 - 08/19/10 06:53 AM (14 years, 4 months ago)

Quote:

rave420 said:
listen to all these guys here :laugh:


Then again, i grew up in a household where the pressure cooker was used extensively for canning and food preparation, and my parents NEVER EVER let their food from the pressure cooker cool down before serving it :wink: They would even forcefully release the steam, slowly, but they would. They'd call us to table, we would sit down and dad hauled a whistling pressure cooker from the stove to the table. We would wait a bit and then mom would release the steam and serve us all a portion. So much for exploding pressure cookers.





A quick cool is fine as long as you have food directly in the pressure cooker. I think letting it cool naturally has more to do with the equilibrium of the jars and the possibility of implosion if you change that too quickly. I know when canning they say the same thing, so I'm sure it has to do with the jars. When foods are cooked openly in a pressure cooker you don't have to worry about it, as the pressure is the same everywhere inside the cooker. But if you have sealed jars in there, let it cool naturally so the jars can depressurize/cool down slowly.

Edited by JonnyBtreed (08/19/10 07:01 AM)

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OfflinehamloafM
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Re: Jars touching in pressure cooker. [Re: cookie dude]
    #13072397 - 08/19/10 07:05 AM (14 years, 4 months ago)

Quote:

The instructions for my pressure cooker tell you to "Quick cool"  it by  placing it under a running tap, After about 20 seconds the valve drops down letting you know all the pressure has been released and its safe to open.




The instructions on your pressure cooker are for canning preservatives not sterilizing grain jars.  As a Mycologist, I never quick cool my PC after grain sterilization.  When sterilizing grains in jars with your PC once they are done turn off the stove and let cool naturally.  If you are in that much of a hurry, don't be.  Your jars are still going to be hot but the lid is safe to remove from your PC once the pressure regulator reads 0 and the inter locking assembly has gone back down.
LM


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Offlinek4ge
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Re: Jars touching in pressure cooker. [Re: freespeech]
    #13073027 - 08/19/10 10:46 AM (14 years, 4 months ago)

Quote:

freespeech said:
Quote:

k4ge said:
I had a rack, there was water left after PCing, and I didn't speed cool my pressure cooker.  After pressure cooking U just put it outside overnight.




You put it outside overnight? Why? Maybe that is a problem. How cold does it get at night?

When you're done PCing, just turn off the stove and walk away.





I put it outside because I have room mates that cook at like 2 am.

It doesn't really get cold at night though... prob like 5 c


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OfflineDrasman123
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Re: Jars touching in pressure cooker. [Re: k4ge]
    #13073038 - 08/19/10 10:50 AM (14 years, 4 months ago)

I have put probably 100 jars into my pressure cooker including stacking my petri dishes on top of one another and they are made of pyrex glass. I dont think you need a barrier between jars just the bottom of the pc and the glass.

Just dont put your moms corell dishes in the pressure cooker haha!


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