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Offlinedunnomuch
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PC Not reaching 15 psi
    #28363874 - 06/17/23 10:55 PM (1 year, 6 months ago)

After a few failed grain preparations, began to suspect the PC. Now discovered that it only goes to 14 psi. Should the time be extended to achieve sterility for grains to compensate ?

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OfflinePandaskis
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Re: PC Not reaching 15 psi [Re: dunnomuch]
    #28363884 - 06/17/23 11:22 PM (1 year, 6 months ago)

Yeah if it isnt coming up to 15 psi youll need to pc longer. Does your PC use a rocker or a guage?

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Invisiblebuddzy
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Re: PC Not reaching 15 psi [Re: Pandaskis]
    #28363906 - 06/18/23 12:30 AM (1 year, 6 months ago)

Man tape three or four quarters to the jiggler stays around 16psi only rocking 1 or 2 times a minute super easy.

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Offlinedunnomuch
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Re: PC Not reaching 15 psi [Re: Pandaskis]
    #28363909 - 06/18/23 12:41 AM (1 year, 6 months ago)

No gauge, has a weight which doesn't really rock, a slide fit over a tube which is similar to rockers. Manufacturer states in the manual that it can be used to sterilise things such as baby bottles  :-)
Never heard it blow off.

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Offlinedunnomuch
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Re: PC Not reaching 15 psi [Re: buddzy]
    #28363913 - 06/18/23 12:47 AM (1 year, 6 months ago)

Quote:

buddzy said:
Man tape three or four quarters to the jiggler stays around 16psi only rocking 1 or 2 times a minute super easy.



I have added three magnets to the weight, but this thing doesn’t not have a “rocking” weight, it fits neatly over the vent tube. Maybe having done that it may reach 15 psi, but having problems with oat jars getting contams even though not inoculated. So over it, looking at a Presto, 16 Q.
Thanks for the reply !

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Invisiblebuddzy
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Re: PC Not reaching 15 psi [Re: dunnomuch]
    #28363922 - 06/18/23 01:02 AM (1 year, 6 months ago)

With cereal grains the most important part is making sure they are hydrated before the PC cycle take a few grains and cut them in half they should be translucent and not starchy let dry for an hour or more then load up in your jars.  Now how about of a pic of your PC valve.

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OfflinePBJ710
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Re: PC Not reaching 15 psi [Re: buddzy]
    #28364215 - 06/18/23 10:24 AM (1 year, 6 months ago)

Which model of PC are you currently using?

How are you prepping the oats and what is your PC process for them?  As stated above under hydrated grain makes effective sterilization much harder to achieve.

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InvisibleStipe-n CapMDiscord
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Re: PC Not reaching 15 psi [Re: dunnomuch]
    #28364230 - 06/18/23 10:34 AM (1 year, 6 months ago)

Quote:

dunnomuch said:
After a few failed grain preparations, began to suspect the PC. Now discovered that it only goes to 14 psi. Should the time be extended to achieve sterility for grains to compensate ?




Shouldn't make a difference. I've validated pressure cookers that don't reach 14psi. Run for 2 hours, will be gtg so long as you've vented your pc. Be sure to wash/rinse grain clean prior to prep. If your problems persist, clean up your culture; if you're using LC, stop and go bact to a2g until you've figured it out.

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InvisibleYuggoth
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Re: PC Not reaching 15 psi [Re: Stipe-n Cap]
    #28364275 - 06/18/23 11:20 AM (1 year, 6 months ago)

My Presto manual says something about getting service if the PC won't reach 14 PSI, not 15. And it only hits about 14.5 PSI in cruise mode, I need the heat on HIGH to actually touch 15 on the dial.

My T-fal never passes 14 PSI.

I think the sterilization tables for canning have a little wiggle room in them. Also, the gauge is not perfect. The only way to REALLY know the pressure is to measure the temperature while in use, which is a bit of a hassle.


--------------------
We have not succeeded in answering all our problems. The answers we have found only serve to raise a whole set of new questions. In some ways we feel we are as confused as ever, but we believe we are confused on a higher level and about more important things. -- Earl C. Kelley

Things I really wish I knew when I started // Vacuum sealer discussion thread // Shroomery gif zoo

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InvisibleStipe-n CapMDiscord
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Re: PC Not reaching 15 psi [Re: Yuggoth]
    #28364377 - 06/18/23 01:10 PM (1 year, 6 months ago)

I use an min/max temp registering autoclave thermometer and biological indicator vials with chem strips.

2 hours works.

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InvisibleYuggoth
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Re: PC Not reaching 15 psi [Re: Stipe-n Cap]
    #28364382 - 06/18/23 01:14 PM (1 year, 6 months ago)

Quote:

Stipe-n Cap said:
I use an min/max temp registering autoclave thermometer and biological indicator viles with chem strips.

2 hours works.




We are on the same side, I was also trying to reassure OP.


--------------------
We have not succeeded in answering all our problems. The answers we have found only serve to raise a whole set of new questions. In some ways we feel we are as confused as ever, but we believe we are confused on a higher level and about more important things. -- Earl C. Kelley

Things I really wish I knew when I started // Vacuum sealer discussion thread // Shroomery gif zoo

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InvisibleStipe-n CapMDiscord
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Re: PC Not reaching 15 psi [Re: Yuggoth]
    #28364384 - 06/18/23 01:16 PM (1 year, 6 months ago)

Lel, I was agreeing with you also. Such is the nature of text sometimes. Difficult to interpret intention with short text :cheers:

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InvisibleYuggoth
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Re: PC Not reaching 15 psi [Re: Stipe-n Cap]
    #28364389 - 06/18/23 01:19 PM (1 year, 6 months ago)

Quote:

Stipe-n Cap said:
Lel, I was agreeing with you also. Such is the nature of text sometimes. Difficult to interpret intention with short text :cheers:




CHAIRS to that my friend!


--------------------
We have not succeeded in answering all our problems. The answers we have found only serve to raise a whole set of new questions. In some ways we feel we are as confused as ever, but we believe we are confused on a higher level and about more important things. -- Earl C. Kelley

Things I really wish I knew when I started // Vacuum sealer discussion thread // Shroomery gif zoo

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Offlinephlanx
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Re: PC Not reaching 15 psi [Re: Stipe-n Cap]
    #28364777 - 06/18/23 09:16 PM (1 year, 6 months ago)

Quote:

Stipe-n Cap said:
I use an min/max temp registering autoclave thermometer and biological indicator viles with chem strips..




Hey Stipe-n Cap!

Can you expand on this process a little bit?  Just interested in the tech you are using. I understand the min/max thermometer, pretty sure I got the bio indicator vial, but what is a chem strip?

Thanks for your guidance,
Phlanx

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Offlinesprocket
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Re: PC Not reaching 15 psi [Re: phlanx] * 1
    #28364790 - 06/18/23 09:28 PM (1 year, 6 months ago)



--------------------
How do pirates clone their mushrooms?

        With agarrrrrr.:captain::captain:

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InvisibleStipe-n CapMDiscord
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Re: PC Not reaching 15 psi [Re: phlanx]
    #28364808 - 06/18/23 10:00 PM (1 year, 6 months ago)

Quote:

phlanx said:
Quote:

Stipe-n Cap said:
I use an min/max temp registering autoclave thermometer and biological indicator viles with chem strips..




Hey Stipe-n Cap!

Can you expand on this process a little bit?  Just interested in the tech you are using. I understand the min/max thermometer, pretty sure I got the bio indicator vial, but what is a chem strip?

Thanks for your guidance,
Phlanx




Check out the autoclave calidation link in my sig.

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Offlinephlanx
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Re: PC Not reaching 15 psi [Re: Stipe-n Cap]
    #28364822 - 06/18/23 10:34 PM (1 year, 6 months ago)

Phenomenal write-up.

Thanks!

Phlanx

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Offlinesomogyi
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Re: PC Not reaching 15 psi [Re: dunnomuch]
    #28364907 - 06/18/23 11:33 PM (1 year, 6 months ago)

Quote:

dunnomuch said:
After a few failed grain preparations, began to suspect the PC. Now discovered that it only goes to 14 psi. Should the time be extended to achieve sterility for grains to compensate ?




There's not a great difference between 14 and 15 PSI (~ ∆-7%) and you shouldn't  experience any observable difference in results, as stated by Stipe-n Cap. If you're seriously concerned about contamination coming from the pressure cooker, perhaps you could run it for slightly longer- actually, if the contamination is due to the pressure cookers poor performance, and there's such a little difference between 14 and 15 PSI, you may need to run it for much longer. There's likely another source of contamination somewhere.

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Offlinedunnomuch
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Re: PC Not reaching 15 psi [Re: Stipe-n Cap]
    #28366422 - 06/19/23 11:28 PM (1 year, 6 months ago)

Thank you for the advice 😊

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Offlinedunnomuch
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Re: PC Not reaching 15 psi [Re: PBJ710]
    #28366429 - 06/19/23 11:37 PM (1 year, 6 months ago)

Thank you for the reply. I am boiling racehorse oats, for 40 minutes at least, checking during that time for some burst grains, squeezing some. Overnight on a screen to dry until little moisture remains.
Into  1 qrt jars  lids are filtered, wrap lids with alfoil. Vent PC for 20 minutes after steam appears, PC for 2 hours. Not immediately colonise, tightening lids, leave foil on until needed.

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