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Offlinel0wbob
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VENT YOUR PC! - The influence of the air-content inside a Pressure Cooker on sterilizing-times * 5
    #25755927 - 01/20/19 11:55 AM (5 years, 9 days ago)

This is WIP, read last post if you want to know what's going on

For now i will just show the resulting diagram. The goal is to go over all calculations done to produce the diagram and be as much transparent as possible.

The diagram of the resulting sterilization times depending on the pressure and steam-quality (the more air, the less steam. More air means a low steam quality)


Edited by l0wbob (10/21/23 07:57 AM)


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InvisiblebodhisattaMDiscordReddit
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: l0wbob]
    #25755956 - 01/20/19 12:07 PM (5 years, 9 days ago)

Cool graphs.

I put a max registration thermometer in a cooker with absolutely no venting and the results were pretty different than when venting.


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Offlinel0wbob
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: bodhisatta]
    #25755964 - 01/20/19 12:11 PM (5 years, 9 days ago)

I can upload a picture of the table containing the resulting temperatures if you want.

Edit:

Here you go: ( this imperial system kills me slowly :laugh2: )



would be nice to know how long it takes to reach about 5% air-content max inside a Presto 23qt


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Edited by l0wbob (01/20/19 12:27 PM)


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InvisiblebodhisattaMDiscordReddit
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: l0wbob]
    #25755991 - 01/20/19 12:29 PM (5 years, 9 days ago)

Beats me but 10m venting my thermometer registered 250 or a little above after a 15m run at pressure.

With no venting at all it got a couple degrees over 212


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Offlinel0wbob
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: bodhisatta]
    #25756003 - 01/20/19 12:31 PM (5 years, 9 days ago)

Quote:

bodhisatta said:
Cool graphs.

I put a max registration thermometer in a cooker with absolutely no venting and the results were pretty different than when venting.




I just did a "just-for-fun" calculation with 50% air inside at 15 psi. It results in 212,54 fahrenheit. Crazy temp-drop.


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Offlinesevens
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: l0wbob]
    #25756171 - 01/20/19 01:32 PM (5 years, 9 days ago)

:threadmonitor:


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OfflineWarFlo
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: sevens]
    #25756219 - 01/20/19 02:00 PM (5 years, 9 days ago)

o !@ thanks


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OfflineEl Chupacabra
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: sevens]
    #25756227 - 01/20/19 02:07 PM (5 years, 9 days ago)

Quote:

sevens said:
:threadmonitor:



:themoreyouknow:
Nice graphs and great info. Thanks for this OP!


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Offlinel0wbob
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: El Chupacabra]
    #25757782 - 01/21/19 02:53 AM (5 years, 8 days ago)

Hopefully it helps people to understand why to vent a PC.

Bod did an awesome job to get me interested in the topic.


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OfflinePsion
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: l0wbob]
    #25757840 - 01/21/19 04:04 AM (5 years, 8 days ago)

yeah, i used to get contams even with a PC cooking for 90 minutes. still got trich in like 1 of 5 jars or so. tried the venting thing and not a single one of 10 got trich (until i opened them a month later for a couple :lol:)

small sample size to be sure, but it convinced me to be patient and vent.


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OfflineLyh
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: Psion]
    #25758055 - 01/21/19 07:44 AM (5 years, 8 days ago)

I'm glad my PC vents automatically haha..
Nice post tho


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Edited by Lyh (01/21/19 07:44 AM)


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Offlinel0wbob
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: Lyh]
    #25758060 - 01/21/19 07:45 AM (5 years, 8 days ago)

Quote:

Lyh said:
I'm glad my PC vents automatically haha..
Nice post tho




what kind of PC do you have?


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InvisiblebodhisattaMDiscordReddit
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: l0wbob]
    #25758072 - 01/21/19 08:00 AM (5 years, 8 days ago)

Probably one of those goofy digital ones


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OfflineLyh
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: bodhisatta]
    #25758100 - 01/21/19 08:29 AM (5 years, 8 days ago)

Nah I got a cheap used one from Fissler off eBay


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InvisiblebodhisattaMDiscordReddit
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: Lyh]
    #25758102 - 01/21/19 08:30 AM (5 years, 8 days ago)

Hows that work it has a timer then?


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OfflineLyh
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: bodhisatta]
    #25758110 - 01/21/19 08:35 AM (5 years, 8 days ago)

It has one valve that's open when you start it. After all the air is out it shuts automatically and let's the other valve build the pressure. Works pretty well. Fissler vivavit Royal if you wanna look it up. Unfortunately it's only 8L


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Offlinel0wbob
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: Lyh]
    #25758124 - 01/21/19 08:47 AM (5 years, 8 days ago)

Quote:

Lyh said:
Nah I got a cheap used one from Fissler off eBay




Oh bro, these dont work.

First they say it exactly in their manual that these pressure cookers are not made for sterilization because the temp wont get that high ( 3rd site in manual, point 2 )

The next thing is, on the bottom-side of the PC you can read the maximum absolute pressure this PC is made for which is in most cases 150kpa or 1,5 bar or 21,7557 psi. This is absolute, you have to subtract your current air-pressure from your altitude which is about 1,01325 bar. This results in your pressure inside the PC wont go over 5 bar, which is not even close to 121Β°C.


EDIT: The pressure was not for absolute pressure, it was for internal pressure of the PC. So it will work but on a risky way


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Edited by l0wbob (01/21/19 09:30 AM)


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InvisiblebodhisattaMDiscordReddit
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: Lyh]
    #25758132 - 01/21/19 08:52 AM (5 years, 8 days ago)

Quote:

Lyh said:
It has one valve that's open when you start it. After all the air is out it shuts automatically and let's the other valve build the pressure. Works pretty well. Fissler vivavit Royal if you wanna look it up. Unfortunately it's only 8L



It has no idea the air is out. You need to actually vent it. That's just the safety valve that pops and i would be willing to bet long before all air is out


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Invisible36fuckin5
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: Lyh]
    #25758137 - 01/21/19 08:54 AM (5 years, 8 days ago)

Quote:

Lyh said:
It has one valve that's open when you start it. After all the air is out it shuts automatically and let's the other valve build the pressure. Works pretty well. Fissler vivavit Royal if you wanna look it up. Unfortunately it's only 8L




That's not venting. That happens when it comes to 1 PSI. Every PC has this.


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i recommend common sense and figuring it out.

These are the TEKs I use. They're all as cheap and easy as possible, just like your mom.


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OfflineLyh
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Re: The influence of the air-content inside a Pressure Cooker on sterilizing-times [Re: 36fuckin5] * 2
    #25758142 - 01/21/19 08:56 AM (5 years, 8 days ago)

Ohh whoops guess I need to vent then hahaha


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