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Amazon Shop for: ½ Pint Jars, Pressure Cooker

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Offlinedoc34
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Pressure Cooker Altitude Adjustments
    #2777684 - 06/09/04 12:50 PM (12 years, 5 months ago)

Some of us have problems with contams and we just can't figure out what went wrong and where. :mad:

Well,has anyone taken this into consideration?



Damn,that pic sucks! :thumbdown:

It say's first paragraph VVVVV


          Canning Foods In High Altitude Areas

    In high altitude areas adjustments must be made in the length of time food is processed in a  boiling water bath   and in the amount of pressure foods are subjected to in  pressure canning.The higher the altitude,the longer the processing time in  boiling water canning,and the greater the pounds of pressure in  pressure canning .


I hope you can read the rest.


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InvisiblePrisoner#1M
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Re: Pressure Cooker Altitude Adjustments [Re: doc34]
    #2778075 - 06/09/04 03:48 PM (12 years, 5 months ago)

great info... thanks doc...


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InvisibleDieCommie
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Re: Pressure Cooker Altitude Adjustments [Re: doc34]
    #2778142 - 06/09/04 04:12 PM (12 years, 5 months ago)

I dont think those cooking times have much to do with sterilizing substrate....

Heres what i would do if i lived in a high elevation....Find out what the average atmospheric PSI is and add 15 to that for inside the pressure cooker...then compare the boiling point of the PSI in the cooker to the temperatire needed to kill endospores....

I have a feeling you need to be in a real high altitude to not kill endospores with a 15psi cooker....


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OfflineSev
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Re: Pressure Cooker Altitude Adjustments [Re: DieCommie]
    #2778242 - 06/09/04 04:52 PM (12 years, 5 months ago)

Quote:

DieCommie said:
I dont think those cooking times have much to do with sterilizing substrate....





Yes they do!  If you're living at a higher altitude, the air pressure is lower, and your pressure cooker won't attain the same pressure (and thus temperature) as it would at sea level.  Your 15lb cooker might be running at 12 or 10 or something -- I really can't be bothered to do the math.  :wink:  But in any case, you'd just need to run the cooker longer.  I think that you're probably right -- a 15lb PC would do fine at any altitude, but you might just need to extend the PC time.


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OfflineAnnoA
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Re: Pressure Cooker Altitude Adjustments [Re: Sev]
    #2778854 - 06/09/04 08:05 PM (12 years, 5 months ago)

>Your 15lb cooker might be running at 12 or 10 or something

The pressure inside a 15 psi PC will be 15 psi higher than the ambient pressure regardless of the elevation. The boiling point of water of 250?F is reached at 15 psi over the ambient pressure(which is also ~15 psi) thus at an absolute pressure of 30 psi. If the ambient pressure is lower due to a high elevation, the absolute pressure will also be lower, thus the boiling temperature will also be lower.

And, yes, cooking times absolutely affect the effect of the sterilization greatly.


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OfflineSev
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Re: Pressure Cooker Altitude Adjustments [Re: Anno]
    #2779274 - 06/09/04 10:33 PM (12 years, 5 months ago)

Sorry. I should've said that your PC would be running at the equivalent of a pressure cooker at sea level running at 10 or 12 or something. This heat is making me stupid. %)


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"Do we want the stars? We can have them. Can we borrow cups of fire from the sun? We can and must and light the world." --"On the Shoulders of Giants", Ray Bradbury

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InvisibleDieCommie
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Re: Pressure Cooker Altitude Adjustments [Re: Anno]
    #2779605 - 06/10/04 12:06 AM (12 years, 5 months ago)

Quote:

Sev said:
Quote:

DieCommie said:
I dont think those cooking times have much to do with sterilizing substrate....





Yes they do!




Quote:

Anno said:
>Your 15lb cooker might be running at 12 or 10 or something
And, yes, cooking times absolutely affect the effect of the sterilization greatly.




So if i was at 6000 ft i would have to cook it for 12min more according to those cooking times....but lots of people vary there PC time by more than 12 min dont they? Could you elaborate more on how those cooking times relate to sterilizing substrate?

Even at the high altitude of 6000 ft your boiling point would be 238F, 12degree F drop from sea level boiling point of 250....dosent seem like that would cause your jars to be constantly contaminated....

What temperature is needed to kill endo spores? I cant seem to find this in the FAQ, it just says 15psi....is 250F the lowest temp that sterilize properly?

Whats the elevation where you live doc?


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Offlinedoc34
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Re: Pressure Cooker Altitude Adjustments [Re: DieCommie]
    #2780211 - 06/10/04 06:08 AM (12 years, 5 months ago)



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Edited by doc34 (06/10/04 06:23 AM)


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Amazon Shop for: ½ Pint Jars, Pressure Cooker

Mushrooms, Mycology and Psychedelics >> Mushroom Cultivation

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