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bucket949
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Registered: 04/11/06
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Last seen: 16 years, 7 months
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pressure cooker
#5869278 - 07/17/06 01:08 PM (17 years, 6 months ago) |
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I just bought a used pressure cooker from a consignment shop. How exactly do I use it? It looks pretty basic but how much water do i put in it and how do I know what the psi is? I want to cook 6 jars of substrate let me know..thanks
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Tippinthru
contented

Registered: 04/07/05
Posts: 1,131
Loc: "The Garden"...
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Re: pressure cooker [Re: bucket949]
#5869299 - 07/17/06 01:14 PM (17 years, 6 months ago) |
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PICTURE? Name brand, model, size, weigh regulated, pressure gage, trivet?
-------------------- Perfection is attained by slow degrees; it requires the hand of time... [
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Capless
Student


Registered: 06/25/06
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Re: pressure cooker [Re: bucket949]
#5869310 - 07/17/06 01:18 PM (17 years, 6 months ago) |
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You might want to try to find a serial number or something notable on the PC. If you can find the company's site online, see if you can't contact them and find out what PSI it cooks at.
To use a PC you pretty much do a few steps.
1) Prepare materials that are to go into PC. Seal bags. Seal and cover jars how you like.
2) Fill to the waterline.
3) Fill with items. If a bag is touching of the PC, use aluminium foil to keep it from making direct contact.
4) Put lid into correct position and then lock it into place. Put the pressure regulator on top of the lid.
5) Turn heat on high
6) When the pressure regulator stats to make the sound "Chuh-Chuh-Chuh"(or something similar) over and over then peak pressure has been reach. Turn down the heat to around medium so the frequency of the sound goes down a bit.
7) *goes with 6* Time an hour(or however long) from the point the PC starts making sound, onwards.
8) When the time has elapsed just turn it off and put it on a cold eye to cool for a few hours. *edited for rightness*
9) After its cool enough to rest your hand on, and all the signs of built up pressure are gone, then you may open it. Take your jars and/or bags into your clean room to cool for a bit more.
-------------------- http://www.toolband.com/ "... This body holding me reminds me of my own mortality. Embrace this moment. Remember, We are eternal. all this pain is an illusion...."
Edited by Capless (07/17/06 03:19 PM)
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bucket949
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Registered: 04/11/06
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Re: pressure cooker [Re: Tippinthru]
#5869327 - 07/17/06 01:22 PM (17 years, 6 months ago) |
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http://www.pressurecooker-outlet.com/presto6qtal.htm similar to that its a presto 6 quart pressure cooker, no gauge, looks really old.. $7.50 from a senile woman
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bucket949
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Re: pressure cooker [Re: bucket949]
#5869334 - 07/17/06 01:24 PM (17 years, 6 months ago) |
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whats the "waterline" we are putting 5 1 pint jars in it. How long should we let them cook?
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Yamidude
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Registered: 06/15/06
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Re: pressure cooker [Re: bucket949]
#5869350 - 07/17/06 01:31 PM (17 years, 6 months ago) |
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I would say put the jars in and put the water up about half way if not more up the sides of the jars. Most likely it's a 10psi PC so i would say about an hour and a half. I use a 10psi PC as well and i cook my jars for 1.5 hours.
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Eraserhead
Lost Soul


Registered: 05/26/06
Posts: 1,363
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Re: pressure cooker [Re: Capless]
#5869359 - 07/17/06 01:34 PM (17 years, 6 months ago) |
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Quote:
Capless said:
If you just *need* to get it out of the PC to cook some more, put the PC under some cool running water in the sink for about 20 mintues or so.
Won't this stress the aluminum, possibly causing it to crack your pressure cooker?
An all-american might be able to take that, but any of the others, I'd not reccomend it
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Tippinthru
contented

Registered: 04/07/05
Posts: 1,131
Loc: "The Garden"...
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Re: pressure cooker [Re: bucket949]
#5869361 - 07/17/06 01:35 PM (17 years, 6 months ago) |
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Does it have a trivet? That is a round rack, that sets inside the PC, on the bottom. Object is, so jars don't have direct contact with the bottom.
Always PRESSURE TEST a PC, with a little water in it, before you try PC'ing anything. That will tell you if the seal is good. And, you can get the hang of, how the weight sounds, as it releases steam. Plus, how to adjust the heat down, so the weight doesn't release excess steam.
Once at that point, you can talk about WHAT it is, you intend to PC & how long.
-------------------- Perfection is attained by slow degrees; it requires the hand of time... [
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Tippinthru
contented

Registered: 04/07/05
Posts: 1,131
Loc: "The Garden"...
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Re: pressure cooker [Re: Eraserhead]
#5869371 - 07/17/06 01:38 PM (17 years, 6 months ago) |
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Quote:
Eraserhead said:
Quote:
Capless said:
If you just *need* to get it out of the PC to cook some more, put the PC under some cool running water in the sink for about 20 mintues or so.
Won't this stress the aluminum, possibly causing it to crack your pressure cooker?
An all-american might be able to take that, but any of the others, I'd not reccomend it : :
You NEVER want to subject HOT metal, to COLD water. Unless your intent is to cause metal distortion, fatigue, warping, or fractures.
-------------------- Perfection is attained by slow degrees; it requires the hand of time... [
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bucket949
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Re: pressure cooker [Re: Tippinthru]
#5869425 - 07/17/06 02:13 PM (17 years, 6 months ago) |
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Steam is coming out of the top... should it be sealed?
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Yamidude
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Re: pressure cooker [Re: bucket949]
#5869459 - 07/17/06 02:26 PM (17 years, 6 months ago) |
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Quote:
bucket949 said: Steam is coming out of the top... should it be sealed?
steam will come out of the top..
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bucket949
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Re: pressure cooker [Re: Yamidude]
#5869603 - 07/17/06 03:16 PM (17 years, 6 months ago) |
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We just got done pressure cooking 5 1 pint jars for about an hour and 15 minutes. The jars are currently cooling as I type this post. They appear to have some condensation inside of the jars, is this a problem? It looks very miniscule at the most. Feedback much appreciated.
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Capless
Student


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Re: pressure cooker [Re: Eraserhead]
#5869608 - 07/17/06 03:19 PM (17 years, 6 months ago) |
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I wasn't sure. My mother just mentioned it to me. I've never taken it off blazing hot and put water on it.
Alas though now that I think back you're right. Cars come to mind. If you pour water on a hot block(of any metal) it is liable to crack it.
Just don't pour water on it when its really hot, and pressure is built up inside it.
Also changed my post for correctness.
Edited by Capless (07/17/06 04:46 PM)
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creamcorn
mad scientist


Registered: 03/13/06
Posts: 2,962
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Re: pressure cooker [Re: Capless]
#5869668 - 07/17/06 03:40 PM (17 years, 6 months ago) |
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ive seen that advice in recipes before actually.. to quickly depressurize and cool to stop whatever is inside cooking, so while not the smartest thing for all the mentioned reasons, pepole who actually use their PC's for making food do it apparently.
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fastfred
Old Hand



Registered: 05/17/04
Posts: 6,899
Loc: Dark side of the moon
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Re: pressure cooker [Re: creamcorn]
#5869843 - 07/17/06 04:27 PM (17 years, 6 months ago) |
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See here for some general info... http://www.shroomery.org/forums/showflat.php/Cat/0/Number/5856771
> ive seen that advice in recipes before actually.. to quickly depressurize and cool to stop whatever is inside cooking
That's crazy talk. If you want to ruin your PC and possibly suffer serious injuries from it exploding on you then go ahead. Depressurizing or cooling quickly also causes the water in the jars to BOIL. You don't want that. Any recipy that calls for that is a recipy for failure and possibly serious injury.
Please post a link for me so I can sue the fuck out of them.
> Most likely it's a 10psi PC so i would say about an hour and a half.
Proper time for PF jars is 30 min at 12 psi. 10 psi is ~3C lower than 12 psi. That equates to a proper cooking time of ~39 minutes at 10 psi. I think I said ~33 once, but when I calculated it this time I got 39, go figure. I double checked though and 39 min is right.
1 hour is overcooking them, 1.5 hours is just crazy.
-FF
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Yamidude
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Registered: 06/15/06
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Re: pressure cooker [Re: fastfred]
#5869880 - 07/17/06 04:36 PM (17 years, 6 months ago) |
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Quote:
fastfred said: See here for some general info... http://www.shroomery.org/forums/showflat.php/Cat/0/Number/5856771
> ive seen that advice in recipes before actually.. to quickly depressurize and cool to stop whatever is inside cooking
That's crazy talk. If you want to ruin your PC and possibly suffer serious injuries from it exploding on you then go ahead. Depressurizing or cooling quickly also causes the water in the jars to BOIL. You don't want that. Any recipy that calls for that is a recipy for failure and possibly serious injury.
Please post a link for me so I can sue the fuck out of them.
> Most likely it's a 10psi PC so i would say about an hour and a half.
Proper time for PF jars is 30 min at 12 psi. 10 psi is ~3C lower than 12 psi. That equates to a proper cooking time of ~39 minutes at 10 psi. I think I said ~33 once, but when I calculated it this time I got 39, go figure. I double checked though and 39 min is right.
1 hour is overcooking them, 1.5 hours is just crazy.
-FF
I PC'ed 15 jars for 1.5 hours and all are just about to finish 100% colonization and I had Zero contam. I used PFtek and also did some WBS jars as well. So what you may call crazy i call researched and performed with great results.
I dont really know where you're coming from but i just looked up about 5 or 6 different teks. most if not all PFteks say 45 minutes to 1 hours is optimal. And if you look up the multiple threads on 10PSI PC'ing you will see that it is advisable to PC longer at lower PSI.
I personally would say that 1hr should be a min. for a 10psi cooker.
Edited by Yamidude (07/17/06 04:41 PM)
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creamcorn
mad scientist


Registered: 03/13/06
Posts: 2,962
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Re: pressure cooker [Re: fastfred]
#5869970 - 07/17/06 05:07 PM (17 years, 6 months ago) |
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Quote:
fastfred said:
> ive seen that advice in recipes before actually.. to quickly depressurize and cool to stop whatever is inside cooking
That's crazy talk. If you want to ruin your PC and possibly suffer serious injuries from it exploding on you then go ahead. Depressurizing or cooling quickly also causes the water in the jars to BOIL. You don't want that. Any recipy that calls for that is a recipy for failure and possibly serious injury.
Please post a link for me so I can sue the fuck out of them.
http://pub39.bravenet.com/faq/show.php?usernum=3266196251&catid=1490
"Cold Water Release Method -- If a quicker release of pressure is desired, the pan can be carried to the sink and cold water may be run over the lid (but not the valve). This method is mainly used for food with short cooking times where it is essential to stop the cooking process as fast as possible. For example risotto, polenta, or fresh vegetables."
I've seen it mentioned in lots of places actually, I dug that link up in about 5 seconds flat, its not all that rare a suggestion... agreed still not a smart thing to do, and especially not with glass jars that will likely crack in our situation. But its definitely out there.
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fastfred
Old Hand



Registered: 05/17/04
Posts: 6,899
Loc: Dark side of the moon
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Re: pressure cooker [Re: Yamidude]
#5869987 - 07/17/06 05:14 PM (17 years, 6 months ago) |
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Standard serialization wisdom is to halve or double the sterilization times for every 10C temp difference. That's where I'm getting my numbers.
> most if not all PFteks say 45 minutes to 1 hours is optimal.
There is only one "PF Tek" the rest are knockoffs and some of them have completely bogus info in them. Sure you can PC for a long time if you want, but it is not good for your substrate. When sterilizing you want to find and use the minimum time required for complete sterilization. Then you usually add a few minutes to be safe.
It takes 15 min @ 15 psi to sterilize something. Then you have to account for the time it takes for everything in the PC to come up to that temp. That number will vary with what you're cooking, but it's not going to take 45 minutes after hitting 15 psi for 1/2 pint jars to come up to temp.
PF's figure of it taking 15 min to come up to temp + 15 min to sterilize is pretty accurate. It should take the same amount of time to come up to temp at 10 psi, and about 30% longer to sterilize. I figured a 30% increase to the entire time, so I'm pretty sure you're not going to need any longer than 39-45 min to sterilize at 10 psi. That should also already have a safety factor figured in.
-FF
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fastfred
Old Hand



Registered: 05/17/04
Posts: 6,899
Loc: Dark side of the moon
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Re: pressure cooker [Re: fastfred]
#5870097 - 07/17/06 05:39 PM (17 years, 6 months ago) |
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CC, that advice is for cooking food (not in jars) in your PC. Not for canning or using jars. It's dangerous and stupid even for cooking foods.
Besides being dangerous it WILL ruin your pressure cooker eventually. And when it goes it has a good chance of taking you with it. It will also cause the water in your substrate to boil, which will totally screw your moisture content.
-FF
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Capless
Student


Registered: 06/25/06
Posts: 365
Last seen: 14 years, 10 months
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Re: pressure cooker [Re: fastfred]
#5870137 - 07/17/06 05:46 PM (17 years, 6 months ago) |
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I am going to agree with everyone else on this issue. Pouring hot water on hot metal(with built pressure inside) is not a good way to go about this. I can't say much for what happens to the jars inside the PC, but I do know for a fact that COLD WATER on a HOT METAL SURFACE is quickly asking for WARPING, CRACKING, and/or just general bad stuff for your PC.
-------------------- http://www.toolband.com/ "... This body holding me reminds me of my own mortality. Embrace this moment. Remember, We are eternal. all this pain is an illusion...."
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