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OfflineOra
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Re: Cultivation General Discussion [Re: Lovage]
    #27398549 - 07/22/21 09:38 PM (2 years, 6 months ago)

I ran my pressure cooker dry when preping agar today. I turned up the fire to 7 with the vent open and then forgot about it for like 30 min. All the water evaporated and the first layer of my pp5 dishes were slightly melted.

My pressure cooker is a fargo so luckily it has a thick bottom so I don't think it has significant warping. The color has turned golden though as happens to stainless steel when heated a lot. The only thing I'm worried about is that the lid was just slightly more difficult to close. There is some slight metal scrapping when I close it that wasn't there before. Is it still OK to use this PC? Hopefully it can still seal alright.


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OfflinePrimalSoup
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Re: Cultivation General Discussion [Re: Ora]
    #27398583 - 07/22/21 10:11 PM (2 years, 6 months ago)

Run a test cycle and see.  Odds are it'll still be fine.  :cookiemonster:


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InvisibleAshtray161
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Registered: 03/21/21
Posts: 4,503
Loc: Rugby, England
Re: Cultivation General Discussion [Re: Ora]
    #27398604 - 07/22/21 10:36 PM (2 years, 6 months ago)

Quote:

Ora said:
I ran my pressure cooker dry when preping agar today. I turned up the fire to 7 with the vent open and then forgot about it for like 30 min. All the water evaporated and the first layer of my pp5 dishes were slightly melted.

My pressure cooker is a fargo so luckily it has a thick bottom so I don't think it has significant warping. The color has turned golden though as happens to stainless steel when heated a lot. The only thing I'm worried about is that the lid was just slightly more difficult to close. There is some slight metal scrapping when I close it that wasn't there before. Is it still OK to use this PC? Hopefully it can still seal alright.




Personally I'd be worried to use a damaged PC. Another use pointed out how quickly the metal dramatically heats up once theres no water. Within a minute or two its multiple hundereds of degrees.
Some metals used to make PCs are very reactive to very high temps as well.
Again that's just my 2cents but I wouldn't personally fuck around w PC safety


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(You Know What Time It Is)
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Please, be an adult. Get vaccinated. Dont use psychedelics as an excuse. Dont come at me with some hippy dippy nonsense, GO GET VACCINATED.
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InvisibleFeasoghorm

Registered: 10/24/18
Posts: 4,384
Re: Cultivation General Discussion [Re: PrimalSoup]
    #27398606 - 07/22/21 10:40 PM (2 years, 6 months ago)

Yeah make sure you snuggle up real close to it while it's building pressure


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InvisibleMunchauzen
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Re: Cultivation General Discussion [Re: Feasoghorm]
    #27398611 - 07/22/21 10:47 PM (2 years, 6 months ago)

I've been nervously using a 1920's eau claire wisconsin sterilizer thats super pitted out. always worried its gonna blow out the bottom. hard to not use it for agar, LI, and spore syringe water, though, as it reaches 15 psi in literally less than a minute, where as the presto takes like 20 minutes regardless of the load. luckily found some similar ones on Ebay, will grab one soon to replace my pitted base.

I've also been running a warped presto for like 5 years. Just bought a new one last week! Not having a bowed bottom really makes my radiant stove top work much better.


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OfflinePreparationH
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Re: Cultivation General Discussion [Re: Munchauzen] * 1
    #27398613 - 07/22/21 10:49 PM (2 years, 6 months ago)

You're gonna bring that fuckin thing to temp and get so fuckin pitted





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InvisibleMunchauzen
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Re: Cultivation General Discussion [Re: PreparationH]
    #27398616 - 07/22/21 10:51 PM (2 years, 6 months ago)

them damn lid rings! :rofl: damn thing was spotless when I got my hands on it... 100 years old and I ruin it with jar lids. fuck! I've since stopped using metal jar rings and only juse plastic lids inside my PCs as to avoid rust issues.


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InvisibleFeasoghorm

Registered: 10/24/18
Posts: 4,384
Re: Cultivation General Discussion [Re: PreparationH]
    #27398617 - 07/22/21 10:52 PM (2 years, 6 months ago)

Surfing bra. It's the way, the truth, and the light.
      :jah::potleaf::jah:


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OfflineFailboat
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Re: Cultivation General Discussion [Re: Feasoghorm]
    #27398621 - 07/22/21 10:58 PM (2 years, 6 months ago)

Just don't use softened/salty/electrolytic water. I pitted through 2 Prestos before I moved to distilled, RO, or dehumidifier water.


Edited by Failboat (07/22/21 10:59 PM)


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OfflineOra
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Re: Cultivation General Discussion [Re: Feasoghorm]
    #27398623 - 07/22/21 11:00 PM (2 years, 6 months ago)

Well the bottom is really thick, it has like a protrusion like those all clad pans, but I just wonder about the lid since it's definitely tighter now and has that metal scraping noise. I redid the agar and pced it for 30 min and it seemed fine. It was dripping water a little bit when first venting the steam for 10 min, but when I locked the pressure it stopped.

I just don't know if it held pressure properly because my fargo doesn't have a pressure gauge so I can't ever know the exact psi, but it's supposed to be 15. Are there any tell tale signs of a PC leaking pressure?


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InvisibleMunchauzen
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Re: Cultivation General Discussion [Re: Ora]
    #27398626 - 07/22/21 11:03 PM (2 years, 6 months ago)

it won't hold pressure at the same temp it did before


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Invisiblesandman420
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Re: Cultivation General Discussion [Re: Munchauzen]
    #27398631 - 07/22/21 11:12 PM (2 years, 6 months ago)

The steam is usually a giveaway :buzzaldrin:


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- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

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InvisibleLovage
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Re: Cultivation General Discussion [Re: Munchauzen]
    #27398633 - 07/22/21 11:15 PM (2 years, 6 months ago)

Quote:

Munchauzen said:
I've been nervously using a 1920's eau claire wisconsin sterilizer thats super pitted out. always worried its gonna blow out the bottom. hard to not use it for agar, LI, and spore syringe water, though, as it reaches 15 psi in literally less than a minute, where as the presto takes like 20 minutes regardless of the load. luckily found some similar ones on Ebay, will grab one soon to replace my pitted base.

I've also been running a warped presto for like 5 years. Just bought a new one last week! Not having a bowed bottom really makes my radiant stove top work much better.




If it’s from EauClaire it’s prolly. Presto. That’s where the company was located when I grew up in that area. Pitting is generally caused from someone putting them in a dishwasher. Huge reminder to everyone… HAND WASH YOUR COOKWARE. DISHWASHING CHEMICALS PIT EVERY THING METAL THATS NOT STAINLESS STEEL.


--------------------
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Edited by Lovage (07/22/21 11:19 PM)


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OfflineFailboat
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Re: Cultivation General Discussion [Re: Lovage]
    #27398637 - 07/22/21 11:22 PM (2 years, 6 months ago)

Galvanic corrosion is what the guy at Presto edumacated me bout


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InvisibleLovage
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Re: Cultivation General Discussion [Re: Failboat]
    #27398641 - 07/22/21 11:29 PM (2 years, 6 months ago)

Quote:

Quirkmeister92 said:
Galvanic corrosion is what the guy at Presto edumacated me bout



I am sure vinegar and other acids put them through hell too but dishwashers will tear your cookware the fuck up BAD. I’m a professional chef by schooling and profession. I don’t know what galvanic corrosion is and I’m too lazy to look it up but I would imagine someone at some point ran that PC through a dish machine trying to save themselves some work. It’s just how humans are naturally. I have thousands of dollars in cookware that looks like Ray Liotta because my ex wife was too lazy to hand wash the pots. Then when they turned to shit she gave back to Me lol. Go figure


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Offlinegone-pear-shaped
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Registered: 10/30/17
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Re: Cultivation General Discussion [Re: Lovage]
    #27398651 - 07/22/21 11:54 PM (2 years, 6 months ago)

Salt is the primary cause of pitting in stainless. And it is just a problem of stainless steel, not other metals. The chlorine gets into the metal and helps start an electrochemical reaction. Basically a battery forms inside the pit and starts doing electrolysis, creating oxygen and rust. AFAIK there's no solution once it's started. The start probably was not a dishwasher but cooking with salt, maybe letting salt concentrate on the surface as it dried. Eventually a scratch could become a pit.

But it's been a few years since I read about pitting.


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OfflineFailboat
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Re: Cultivation General Discussion [Re: gone-pear-shaped]
    #27398653 - 07/22/21 11:58 PM (2 years, 6 months ago)

"The galvanic corrosion of aluminum is usually mild, except in highly conductive media such as slated slush from road deicing salts, sea water and other salty electrolytes. The contact area must be wetted by an aqueous liquid or humidity in order to ensure ionic conduction."

Increased temp/pressure speeds up the reaction if I'm not mistaken. Softened water be salty.

Rusty at Presto said:
The "pitting" is actually called galvanic corrosion, and is fairly common.  It is a result of interaction between 2 dissimilar metals. 

There are 2 ways to prevent or minimize additional pitting.  First, use bottled water rather than your water supply.  This however, can become costly.  the second way to minimize pitting is discussed in the instruction/recipe booklet that came with your canner.  Point 1 in the "care and Maintenance" section of the book states " Due to acidic nature of the water supply in some areas, deterioration of the interior surface of the canner body may occur.  To minimize this effect, thoroughly scour the inside of the canner body with an abrasive cleanser at least one a year.  Do not let water sit in canner after canning is completed,  dry thoroughly each time.


Edited by Failboat (07/23/21 12:00 AM)


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InvisibleLovage
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Re: Cultivation General Discussion [Re: Failboat]
    #27398661 - 07/23/21 12:15 AM (2 years, 6 months ago)

I still bet it’ went through a dishwasher lol. I didn’t even think of salt but that makes total sense. I know acids could do it. Maybe there are metal powders in dishwasher detergent that cause reactions or maybe even some sort of salt. Salt is an excellent cleaner so... Either way. Hand wash your cookware


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Dear God, did you see all the boobs on that guy…


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Offlinegone-pear-shaped
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Re: Cultivation General Discussion [Re: Lovage]
    #27398676 - 07/23/21 12:56 AM (2 years, 6 months ago)

Dishwasher detergents don't contain metals, but rather the opposite: they have chelating agents that will take metals out of the equation. A common one is sodium-EDTA, but I've read that's strong enough to eventually wear away at metal surfaces. I bet that's why people say not to put nice stuff in the dishwasher!

I didn't know aluminum could also get electrochemical pitting. Interesting. Though mainly it's a problem involving chromium and chlorine, which is why mild steel doesn't pit.

The Presto manual is right. I said there's no solution, but that's not really true. If you grind out the pit, the deposit of ferrous chlorine compounds will be removed. Giving a non-pitted pot a hard scrub with an abrasive scrubby (or abrasive cleaning compound) will do the same, before the microscopic surface crevice has the chance to become a pit.


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OfflineFailboat
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Re: Cultivation General Discussion [Re: gone-pear-shaped]
    #27398678 - 07/23/21 12:59 AM (2 years, 6 months ago)

Nothing lasts forever, make the most of what you have while you can.:smoker:


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