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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: Autoclave Validation and Load/Cycle Verification (Gourmet edition) [Re: tinyflush]
#28446719 - 08/25/23 06:29 PM (5 months, 23 hours ago) |
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Ah, roger. I misunderstood.
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tinyflush



Registered: 08/09/23
Posts: 26
Loc: US
Last seen: 4 months, 23 days
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Re: Autoclave Validation and Load/Cycle Verification (Gourmet edition) [Re: Stipe-n Cap]
#28446786 - 08/25/23 07:34 PM (5 months, 22 hours ago) |
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Np
-------------------- Tiger got to hunt, bird got to fly; Man got to sit and wonder "why, why, why?" Tiger got to sleep, bird got to land; Man got to tell himself he understand.
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blackout


Registered: 07/16/00
Posts: 5,266
Last seen: 2 months, 23 days
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Re: Autoclave Validation and Load/Cycle Verification (Gourmet edition) [Re: tinyflush]
#28447088 - 08/26/23 07:30 AM (5 months, 10 hours ago) |
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Excellent work.
I had autoclave tape and it was going black at temps below 100C after prolonged times. It would be interesting if you could get "problem grain" or somehow reproduce it and try and sterilize, e.g. I have heard theories that it was kept in damp conditions. I have found random jars over 10 years old that I had kept as tests and they are still OK, I have agar in containers over 5 years old which are still looking good, they have no vents so are not dehydrated.
I posted before how the instantpots get to a higher pressure at first, so if you plug it out and start again it seems you can repeat this cycle, getting to 15psi several times. It makes sense as they would want to get to a high temp at first to ensure the secondary seal engages, that stops steam.

There are IPs that are claimed suitable for canning too, going to higher pressures. There may be a way to modify a regular one.
I would like to do tests with wireless temperature probes, they are cheap enough these days as people used them for cooking meat etc. You have to be careful as a metal probe may conduct heat better than the surrounding grains so register a temperature which the core of a dry grain has yet to reach.
I had a few ideas for overcoming the "cold core" problem too, e.g. having a copper tube passing through the centre of large jars, so steam can freely travel through and it has great heat transfer properties. A lot of my ideas are not practical on a large scale but may suit some people. A more simple one is taking out jars and shaking after initial heating, or microwaving to get up to temperature. I can routinely get grains and liquids well past 100C in a microwave which many will say is "against the laws of physics", but they are strangely reluctant to test it for themselves... Most will admit they can at least get to 100C which is a big head start before putting the in a PC.
Large bags of grain can be pressed in a way so the heating is more uniform, similar to how a burger can have a hole poked or pressed in the middle to the centre of the burger is not the last place to cook. So it lowers the required cook time and is overall more uniform.
There are metal alloys out there with low melting points, these could possibly be used as reusable test specimens, people use sugar in ovens to determine hot/cold spots.
this image was showing the difference in can sizes, the larger one taking more time to reach temp.
Edited by blackout (08/26/23 07:37 AM)
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stuckn3rd
Stranger
Registered: 06/29/22
Posts: 11
Last seen: 2 months, 10 days
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Re: Autoclave Validation and Load/Cycle Verification (Gourmet edition) [Re: Stipe-n Cap]
#28459230 - 09/05/23 08:06 AM (4 months, 21 days ago) |
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🤘🏻
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