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OfflineKillaFromManilla
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Registered: 06/15/16
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Re: Mirro pressure cooker [Re: The_breadsticks]
    #24039231 - 01/25/17 04:44 PM (7 years, 5 days ago)

I have had jars crack as I was putting them in the pressure cooker.  I believe they were slightly damaged however, and the temperature change blew them out.  Any large temperature swing between the water and glass can cause shock to the glass, that's why we don't throw warm water on our car windows to clean them off.  However it's got to be a large swing of temperature for intact glass to give out.  Basically, if you don't let it vent the air out it may read 15psi on a gauge or it may even rock your 15lb weight, but the psi inside the pressure cooker will not be that high.  Your temperature won't be as high as you were intending.  You may still have success at sterilization, you may not.


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InvisiblebodhisattaMDiscordReddit
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Re: Mirro pressure cooker [Re: KillaFromManilla]
    #24039429 - 01/25/17 06:07 PM (7 years, 5 days ago)

It will be that high in the PC if the gauge says it is or the rocker moves, 15 is 15 is 15. the partial pressure of steam will be less than 15 as some of that 15psi is made up of the dry air's pressure.

Pretend you have a balloon of 20% N2 and 80% O2 at 10psi
The o2 contribute 8 psi the n2 contribution is 2psi.
This is an oversimplified version and assumed ideal gas laws in effect.

Look up the gas law, ideal gas law, and partial pressure


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OfflineKillaFromManilla
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Re: Mirro pressure cooker [Re: bodhisatta]
    #24039541 - 01/25/17 06:48 PM (7 years, 5 days ago)
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You're right about the pressure, I was mixed up obviously. I apologize, been a few years since college. However, the temperature portion is correct.  Here's a very interesting experiment on several bacteria that shows the time increase needed to reach sterilization is greatly increased if air isn't evacuated.  Just 25% air volume can double sterilization time of wet cotton swabs inoculated with two species of clostridium.  It's really an interesting read.


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InvisibleLoveshroomz777


Registered: 11/19/16
Posts: 616
Re: Mirro pressure cooker [Re: KillaFromManilla]
    #24047237 - 01/28/17 06:54 PM (7 years, 2 days ago)

Any suggestions as to how high I should have my jars off the bottom of the PC I was thinking 1 inch and a half from what I have read what do you guys think


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InvisiblePipefitter537
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Re: Mirro pressure cooker [Re: Loveshroomz777]
    #24047252 - 01/28/17 07:00 PM (7 years, 2 days ago)

That should be fine. How long of a cycle are you running?


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"You should never underestimate the predictability of stupidity"-Bullet Tooth Tony




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InvisibleLoveshroomz777


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Re: Mirro pressure cooker [Re: Pipefitter537]
    #24047414 - 01/28/17 08:07 PM (7 years, 2 days ago)

Ninety minutes and thanks for the help


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Edited by Loveshroomz777 (01/28/17 08:10 PM)


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InvisiblebodhisattaMDiscordReddit
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Re: Mirro pressure cooker [Re: Loveshroomz777]
    #24047442 - 01/28/17 08:27 PM (7 years, 2 days ago)

Quote:

Loveshroomz777 said:
Any suggestions as to how high I should have my jars off the bottom of the PC I was thinking 1 inch and a half from what I have read what do you guys think



Use the trivet it comes with


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InvisibleLoveshroomz777


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Re: Mirro pressure cooker [Re: bodhisatta]
    #24047463 - 01/28/17 08:41 PM (7 years, 2 days ago)

Ok thanks bodhisatta for the help! :smile:


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InvisibleLoveshroomz777


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Re: Mirro pressure cooker [Re: Loveshroomz777]
    #24049721 - 01/29/17 05:56 PM (7 years, 1 day ago)

So my PC comes with two trivets I am going to use one for the bottom and the second one to stack my second row of jars on top of my question is my trivet only sits about an inch above the pot will this be ok
Can I fill the water a half inch up past trivet so that I have a inch and a half of water? Also this would mean that the jars will be in a half inch of water should this be fine thanks guys


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InvisiblebodhisattaMDiscordReddit
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Re: Mirro pressure cooker [Re: Loveshroomz777]
    #24049817 - 01/29/17 06:27 PM (7 years, 1 day ago)

Yes the trivet is only a half inch tall. I use 3-4 quarts of water it goes half way up the side of the first layer of jars


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InvisibleLoveshroomz777


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Re: Mirro pressure cooker [Re: bodhisatta] * 1
    #24049823 - 01/29/17 06:30 PM (7 years, 1 day ago)

Ok bodhisatta I will do it like you said thanks

I am so excited I just got the pressure cooker today I will be starting my grow on the 1st of February I will post pictures


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PEACE, LOVE AND PSYCHEDELICS



Edited by Loveshroomz777 (01/29/17 06:45 PM)


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OfflineOrbit
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Re: Mirro pressure cooker [Re: Loveshroomz777] * 1
    #24050293 - 01/29/17 09:20 PM (7 years, 1 day ago)

A pc is not really that complicated. Hears some simple stuff that may shed some light for some.

Steam transfers heat better than air so you vent the air, venting times very depending on what you have in the PC. The PC vents the entire time so im not too concerned with venting. I see good steam i put the rocker on. You could do the same thing with air inside but it would take longer.

At seal level water boils at 100c.
By raising the pressure 15psi you are raising the boiling point of water 15psi 121c. Killing temp.
So you are basically raising the internal temp of the PC without boilng the water out of your media. The steam comes from the water you add. If you run your PC dry guess where the steam comes from. Media, not good,  plus you are overheating the bottom of your PC.

All the rocker does is relieves exess pressure. So if the rocker is slowly rocking (good) you have 15 psi. If it is rocking crazy you have 15psi slightly more, but are wasting energy on creating more steam. If you really overheat, the safety will blow out preventing an explosion. If the rocker has stopped you are below 15psi 121c.
Hope this sheds a little light.


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OnlineLogicaL ChaosM
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Re: Mirro pressure cooker [Re: Orbit]
    #24050653 - 01/30/17 12:43 AM (7 years, 21 hours ago)

Well said :thumbup:


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OfflineHaywire
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Re: Mirro pressure cooker [Re: LogicaL Chaos]
    #24050873 - 01/30/17 07:10 AM (7 years, 14 hours ago)

dammit, bodhi, you should get your trusted tag just for this thread alone!
talking about composure!


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InvisibleLoveshroomz777


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Re: Mirro pressure cooker [Re: Haywire]
    #24054535 - 01/31/17 01:19 PM (6 years, 11 months ago)

So I vented my PC and now I have the heat on medium and the weight is rocking gently but ever so often it lets out a bunch of steam and the weight rocks a lot for like three seconds then it goes back to a slow gentle rock is my temperature too high


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InvisibleLoveshroomz777


Registered: 11/19/16
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Re: Mirro pressure cooker [Re: Loveshroomz777]
    #24054557 - 01/31/17 01:27 PM (6 years, 11 months ago)

Nvm guys I lowered my heat and it fixed the problem


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OfflineOrbit
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Re: Mirro pressure cooker [Re: Loveshroomz777]
    #24055524 - 01/31/17 07:19 PM (6 years, 11 months ago)

The pressure physically can't change too quick, maybe its just some water causing it. Some electric elements turn on and off and can cause a slight swing in pressure. Sounds like you found a happy medium.:thumbup:


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OfflineThe_breadsticks
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Re: Mirro pressure cooker [Re: Loveshroomz777]
    #24056658 - 02/01/17 09:01 AM (6 years, 11 months ago)

Quote:

Loveshroomz777 said:
So I vented my PC and now I have the heat on medium and the weight is rocking gently but ever so often it lets out a bunch of steam and the weight rocks a lot for like three seconds then it goes back to a slow gentle rock is my temperature too high


it's supposed to do that, set your heat to make it happen every 2 mins or so. If not, you're under pressure.


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InvisibleLoveshroomz777


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Re: Mirro pressure cooker [Re: The_breadsticks]
    #24057420 - 02/01/17 02:11 PM (6 years, 11 months ago)

After I adjusted my heat the weight was just rocking back and forth gently without it going out of control for a couple seconds every two minutes do you guys think my jars still got sterelized


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InvisiblebodhisattaMDiscordReddit
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Re: Mirro pressure cooker [Re: Loveshroomz777]
    #24057422 - 02/01/17 02:11 PM (6 years, 11 months ago)

15psi is 15psi


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