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Invisibledbcooper
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Registered: 08/04/11
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Commercial autoclave: anyone experiment with higher psi cooks?
    #16966046 - 10/04/12 03:05 PM (11 years, 7 months ago)

I've got a commercial autoclave that is rated up to 80 psi. I've done a few cooks at 30 psi and they produced fine.

I'm wondering if anyone in here has experimented with higher psi cooks?

Is there any theoretical advantage to shorter cook times with a higher psi?


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I love the smell of rye in the morning.

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OfflineRogerRabbitM
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Re: Commercial autoclave: anyone experiment with higher psi cooks? [Re: dbcooper]
    #16968768 - 10/04/12 10:16 PM (11 years, 7 months ago)

No advantage.  Also, you can damage filter patch bags at any temp above 260F(according to unicorn) but I was getting some torn bags and weak seams at 20 psi, so I cut it back to 15.
RR


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InvisibleAmphibolos
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Re: Commercial autoclave: anyone experiment with higher psi cooks? [Re: RogerRabbit]
    #16970575 - 10/05/12 08:46 AM (11 years, 7 months ago)

Be aware that 15Psi for 90mins is normally enough to kill the spores of most of the Bacillus species. 80 psi would be absurdly overkill for the use that you have, considering that the molds have weaker spores than the ones bacteria uses. T

The only use that i see is if your pressure cooker is at full capacity and there arent enough air flow inside,  or you are trying to sterilise cans from all the possible spores of the thermophilic Clostridium species (see Clostridium thermohydrosulfuricum for example)


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"Homo sum ; humani nihil a me alienum puto"

Edited by Amphibolos (10/05/12 08:46 AM)

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Offlineprimrose
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Re: Commercial autoclave: anyone experiment with higher psi cooks? [Re: Amphibolos]
    #17056767 - 10/18/12 06:06 PM (11 years, 6 months ago)

Totally agree with Roger Rabbit. 

Maybe you could add a filter patch after the cycle.  However, tried that and it was a pain in the neck and had some contamination.  Some things you just can not improve on as they are at their best already.

Good luck and hope you have great grows!!!

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Invisibledbcooper
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Re: Commercial autoclave: anyone experiment with higher psi cooks? [Re: primrose]
    #17278976 - 11/25/12 01:21 PM (11 years, 5 months ago)

Okay, so I ran a batch of 90 quart jars of rye at 50 PSI for one hour in my commercial autoclave.

The rye came out looking darker than normal, and the berries were somewhat "swollen" compared to normal 20 psi jars, but I G2Ged them and they have all colonized, spawned to tubs, and fruited fine.

The yield and quality of the product seemed to be the same; I see no advantage to higher PSIs based on my experiment.


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I love the smell of rye in the morning.

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Offlinedonrjuan
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Re: Commercial autoclave: anyone experiment with higher psi cooks? [Re: dbcooper]
    #17313401 - 12/01/12 06:54 AM (11 years, 5 months ago)

This may work for rye but I recall something in TMGG regarding the overheating of wood chips and sawdust. It referenced the sugars in the wood overheating causing an unfavorable environment for colonization. Just something to consider if you are doing edibles.

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InvisibleExiledmonkies
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Re: Commercial autoclave: anyone experiment with higher psi cooks? [Re: donrjuan]
    #17347444 - 12/06/12 10:34 PM (11 years, 5 months ago)

I've seen autoclaves that are the size of tanks and can reach 30PSI with ease. When I watched them work with it, they never brought it above 20PSI. They would bring it to 15psi, spike the pressure to 20 for a bit, then back down to 15. Very few bacteria strains can survive 15PSI for more than 45min.

The higher PSI just increases risk to operator and can damage the substrate and jar/bag.

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Invisible36fuckin5
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Re: Commercial autoclave: anyone experiment with higher psi cooks? [Re: dbcooper]
    #17352633 - 12/07/12 09:25 PM (11 years, 5 months ago)

Quote:

dbcooper said:
Okay, so I ran a batch of 90 quart jars of rye at 50 PSI for one hour in my commercial autoclave.

The rye came out looking darker than normal, and the berries were somewhat "swollen" compared to normal 20 psi jars, but I G2Ged them and they have all colonized, spawned to tubs, and fruited fine.

The yield and quality of the product seemed to be the same; I see no advantage to higher PSIs based on my experiment.




If you're gonna go that route, you could seriously cut down on your sterilization times. I'd say 20-30 minutes at 50 PSI would be more than sufficient.

That being said, there's just no reason for it unless you're doing ungodly amounts of spawn. 15-20 PSI for 60-120 minutes (depending on the load) would do you just fine.


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Pat The Bunny said:
A punk rock song won't ever change the world, but I can tell you about a couple that changed me.

bodhisatta said:
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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Offlinetotal
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Re: Commercial autoclave: anyone experiment with higher psi cooks? [Re: 36fuckin5]
    #17361631 - 12/09/12 03:02 PM (11 years, 5 months ago)

Heat rises with pressure...
Most of your materials can only take so much heat...


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