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Mosey3012



Registered: 12/12/12
Posts: 675
Last seen: 4 months, 16 days
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Pressure Cooker - How to determine PSI
#17586162 - 01/21/13 04:46 PM (11 years, 1 month ago) |
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I was given this PC by my mother who received it from hers and blah blah blah. Long story short this thing came with us from South Africa and as far as I can tell the company "Aloe Matic" is nonexistent, leaving me in question as to what PSI this thing actually gets to. Aside from the imprints on the bottom of it there's nothing else that would indicate what it is or how to determine this. Im hoping with these pics someone could at least give me a idea or a place i might acquire such information. Lemme know what you think. Thanks


-------------------- "Each of these lives is the right one! Every path is the right path. Everything could have been anything else and it would have just as much meaning"
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SpitballJedi
Ancient Astronaut


Registered: 10/13/12
Posts: 8,598
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Re: Pressure Cooker - How to determine PSI [Re: Mosey3012]
#17586202 - 01/21/13 04:55 PM (11 years, 1 month ago) |
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Is that top thingy adjustable?
you nay be able to rig a pressure gauge to it.
I don't see a normal safety pressure release valve on it.
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Mosey3012



Registered: 12/12/12
Posts: 675
Last seen: 4 months, 16 days
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Re: Pressure Cooker - How to determine PSI [Re: SpitballJedi]
#17586294 - 01/21/13 05:14 PM (11 years, 1 month ago) |
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Umm, it screws on and that little red thingy slowly comes up as the pressure builds. If I dont screw it on all the way theres small holes that would simply just constantly release the pressure. And when I mean "screw it on all the way" it still actually has a very small portion of those holes uncovered from what I can see. I guess thats where the pressure is being released. The picture above is it actually running and the little red bar is fully extended. Once it reaches whatever PSI it can handle it seems as if the little red bar will auto release a set amount of air to releave itself and maintain said pressure. Its kinda of like its a spring loaded weight I guess. Its definitely safe to run as I gave it a good test run the other day to finally figure out how the hell it worked lol, Ive been a bit nervous about it until now, not so much now that I've actually SEEN it decompress itself then stop and decompress again after the pressure obviously increased.
Side note - Anyone know what those 2 little notches on the bar are for?
*** I just realized that in the second pic u can actually see the areas where it decompresses onto the lid
-------------------- "Each of these lives is the right one! Every path is the right path. Everything could have been anything else and it would have just as much meaning"
  "All that is gold does not glitter, Not all those who wander are lost"
Edited by Mosey3012 (01/21/13 05:16 PM)
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Mosey3012



Registered: 12/12/12
Posts: 675
Last seen: 4 months, 16 days
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Re: Pressure Cooker - How to determine PSI [Re: Mosey3012]
#17586467 - 01/21/13 05:51 PM (11 years, 1 month ago) |
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C'mon guys! No one has a spring loaded PC or something similar? Not even seen one run before? Im attempting to determine psi so that I can figure out how long I need to pc this WBS.
Lets assume its a 10 or 12 psi... but ends up being a 15 psi. Are there any sever repercussion on the substrate if I were to PC for a longer period of time then necessary (say 90 min instead of 60 min) or is that simply just a "waste of time" kinda thing?
-------------------- "Each of these lives is the right one! Every path is the right path. Everything could have been anything else and it would have just as much meaning"
  "All that is gold does not glitter, Not all those who wander are lost"
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36fuckin5
Alchemycologist


Registered: 08/11/03
Posts: 12,081
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Re: Pressure Cooker - How to determine PSI [Re: Mosey3012]
#17589986 - 01/22/13 12:12 PM (11 years, 1 month ago) |
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First off, you should be PCing for at least 90 minutes. But going longer won't hurt anything.
Second, we can't really tell you what PSI it runs at. I wouldn't trust it, personally.
As for the guy who said to rig whatever up, don't do that. Modifying your PC is asking for it to blow up, which they occasionaly do.
-------------------- Redd Foxx said: If you're offended I don't give a shit and don't come see me no more. 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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Mosey3012



Registered: 12/12/12
Posts: 675
Last seen: 4 months, 16 days
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Re: Pressure Cooker - How to determine PSI [Re: 36fuckin5]
#17590300 - 01/22/13 01:12 PM (11 years, 1 month ago) |
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Yeah, im not altering anything that I didnt build or design myself.
Ive read odds and ends about this but nothing specific enough to make me feel completely comfortable with the idea but again ,as ive mentioned prior to this, will anyone confirm on the whole "over cooking" potential to me...
I want to go ahead and just assume that this pressure cooker is a set 10 psi. I've read that for 10 psi one should considering PC'ing for a longer period due to the obvious. So lets say I run this things for 2 hours assuming its 10 psi, but its realistically 15 psi. Will that additional 30 min cooking at 15 psi be determental to the grain at all, causing it to become over cooked or squishy or something or will I have just technically spent an unnecessary extra 30 min sterilizing?
-------------------- "Each of these lives is the right one! Every path is the right path. Everything could have been anything else and it would have just as much meaning"
  "All that is gold does not glitter, Not all those who wander are lost"
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toxetel
׀ǝʇǝxoʇ ●


Registered: 08/13/12
Posts: 708
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Re: Pressure Cooker - How to determine PSI [Re: Mosey3012]
#17590441 - 01/22/13 01:34 PM (11 years, 1 month ago) |
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Maybe you could fill it up to its max-fill line with water, pressure-cook the water for an hour or so, and measure the temperature of the lid. That temperature should be pretty close to the temperature of the steam inside, so you could look up the absolute pressure and subtract atmospheric pressure (14.7 psi at sea level).
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Mosey3012



Registered: 12/12/12
Posts: 675
Last seen: 4 months, 16 days
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Re: Pressure Cooker - How to determine PSI [Re: toxetel]
#17590896 - 01/22/13 02:50 PM (11 years, 1 month ago) |
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Thats a great idea! This is also exactly along the lines of what I was hoping to get from someone. If anything ill give it a shot and see what im working with.
Ive never actually determined something like this before so based off what you just suggested, Id take the temperature of the PC lid and then compare it to that chart... Lets say it reads at 213 F (15 psi), that would be my psi? Im not exactly sure where the whole subtracting the 14.7 from that would come in. Or should I b looking at this more long the lines of it reading like 250 F (30psi) at which point Id subtract the atmos press (14.7) leaving me with a psi of 15.3?
Thanks for the suggestion regardless, ill definitely be trying this just for shits and giggles.
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VirginiaGentleman
Lignin seeker



Registered: 07/09/11
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Re: Pressure Cooker - How to determine PSI [Re: Mosey3012]
#17591008 - 01/22/13 03:05 PM (11 years, 1 month ago) |
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Quote:
Mosey3012 said: Thats a great idea! This is also exactly along the lines of what I was hoping to get from someone. If anything ill give it a shot and see what im working with.
Ive never actually determined something like this before so based off what you just suggested, Id take the temperature of the PC lid and then compare it to that chart... Lets say it reads at 213 F (15 psi), that would be my psi? Im not exactly sure where the whole subtracting the 14.7 from that would come in. Or should I b looking at this more long the lines of it reading like 250 F (30psi) at which point Id subtract the atmos press (14.7) leaving me with a psi of 15.3?
Thanks for the suggestion regardless, ill definitely be trying this just for shits and giggles.
The charts mid-page depict ATMOSPHERIC pressure not GAUGE pressure, you should be seeing 230-250 deg. F at the arbitrary limits of your PC.
Think of it like this, lid off/cold PC os exposed to 14.7 PsiA. when you close and heat the pressure cooker the heat creates double atmospheric pressure, so now you're sitting around 30PsiA and 15PsiG.
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Edited by VirginiaGentleman (01/22/13 03:06 PM)
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36fuckin5
Alchemycologist


Registered: 08/11/03
Posts: 12,081
Loc: Diving into Mystical Territori...
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Re: Pressure Cooker - How to determine PSI [Re: Mosey3012]
#17591200 - 01/22/13 03:40 PM (11 years, 1 month ago) |
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Quote:
Mosey3012 said: I want to go ahead and just assume that this pressure cooker is a set 10 psi. I've read that for 10 psi one should considering PC'ing for a longer period due to the obvious. So lets say I run this things for 2 hours assuming its 10 psi, but its realistically 15 psi. Will that additional 30 min cooking at 15 psi be determental to the grain at all, causing it to become over cooked or squishy or something or will I have just technically spent an unnecessary extra 30 min sterilizing?
It won't hurt the grain at all. You could PC it all night if you could keep enough water in there to keep it going.
I believe the formula is that for every 5 PSI you increase, you can cut your sterilizing time by 1/3, but I'm not 100% on that right now. You should be able to easily look it up though. I wouldn't assume that it runs at 10PSI, though. I'd act like it only runs at 5 PSI. I've never heard of a PC running lower than that. If you find out later that it actually is 10 or 15 PSI, then you did no harm to the grain and you know damn well that any contams came from you, your environment or the inoculant.
I do like the idea of measuring the temp, though. IDK what you could use to accurately do that besides maybe a temp gun, but if you work out that little detail, that'd be a great way to tell. Your idea of subtracting atmospheric pressure from the reading on the chart is correct. 15 PSI should be right around 250F.
But no matter what, it'll work. RR steams his for 8 hours with almsot no pressure and it works.
Personally, I'd save up and drop $100 on a bigger PC, but that will work if it has to, with the variations I mentioned.
-------------------- Redd Foxx said: If you're offended I don't give a shit and don't come see me no more. 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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oONoodlesOo
ShroomSauce


Registered: 04/11/10
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Re: Pressure Cooker - How to determine PSI [Re: 36fuckin5]
#17591252 - 01/22/13 03:48 PM (11 years, 1 month ago) |
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the only thing i can think of is to just make one test jar, pc your medium of choice, knock it up and see if it gets moldy lol, if people can get away with steam sterilization i think you might be good , try it out and let us know.
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Mosey3012



Registered: 12/12/12
Posts: 675
Last seen: 4 months, 16 days
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Re: Pressure Cooker - How to determine PSI [Re: oONoodlesOo]
#17591493 - 01/22/13 04:30 PM (11 years, 1 month ago) |
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Awesome, thank you so much for actually answering that question lol
I most definitely will keep everyone up to date. Its amazing that there's so many helpful and knowledgeable people on here who are willing to share their experiences and thoughts with people :-), I wanna thank you all for any contributions you've provided me thus far.
I plan on slowly upgrading my equipment as i see results however at this point I'm just attempting to work with what I have and get SOMETHING going lol.
The guy who dropped off the coffee jar I posted about is actually supposed to drop off his Presto PC so if anything I'll have 2 of them to play with. I'm going to attempt to measure the temp of the lid from the outside just using a digital therm just to see outta curiosity what it comes back as. At least that should give me a half assed idea of what to assume I'm working with...
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Khii Khwaay
black tooth grin

Registered: 04/16/12
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Re: Pressure Cooker - How to determine PSI [Re: Mosey3012]
#17591668 - 01/22/13 05:06 PM (11 years, 1 month ago) |
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Is there any way to measure the vacuum produced as the PC cools?
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