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InvisibleInocuole
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Re: How to Safely Upgrade your All American pc [Re: Nature Boy]
    #22251381 - 09/17/15 01:57 PM (8 years, 4 months ago)

Anybody die from this yet?


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Re: How to Safely Upgrade your All American pc [Re: Inocuole]
    #22251563 - 09/17/15 02:43 PM (8 years, 4 months ago)

Quote:

midnightmaraude said:
I get scared because my dial is old and tops out at 20psi.




Huh? You mean 20psi is where it starts says caution? The top of the caution area is 30psi. Or do you have a totally different gauge? Pics?


Quote:

blindingleaf said:
have any of u guys actually seen the red blow out plug blow out?  or the black one for that matter?

sometimes, it gets up there in PSI, and i don't catch it quick enough (still messing with heat settings)…i'd feel better if someone saw it happen.



Not I. I'm hoping tahoe gets some time to hook up his air compressor to his cookers to blow out the plugs. I think in order to blow out either plug you have to really not pay attention and push past 30psi. Which is a feat that seems difficult to do when the stopcock starts venting before that. Its hard to find any actual stories about it happening because of the other safeguards in place that function before that point.

I believe I read a post on here once where someone blew out the plug on their PC, I don't recall the details of how it happened. But i recall them saying it was really loud, "like a hand grenade". Having personal experience with real explosives, I find that hard to believe.



Quote:

Inocuole said:
Anybody die from this yet?



Nope! Do the mod and join the race to be the first!!


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RogerRabbit said:You need a bigger pressure cooker for this hobby. RR


Edited by Juiceh (09/17/15 02:46 PM)


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OfflineNature Boy
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Re: How to Safely Upgrade your All American pc [Re: tahoe]
    #22251599 - 09/17/15 02:51 PM (8 years, 4 months ago)

Quote:

tahoe said:
Nature boy, don't be scared ;-). Let her rip. Hey her up to 26psi and let the valve go. Better to do it when you are waiting for it. You will get comfortable with the idea and possibly feel safe.




I think I'll pass on that.  I'm pretty sure I can manage to operate this appliance within it's safety parameters and leave it at that.  Judging from what you wrote though, the pressure relief valve will vent BEFORE the plug will let loose?  That seems sensible.  I would imaging that jars with overly snug lids relying on the equalization provided only through a commercial filter would not react too well if the decompression was that catastrophic. :eek:

N.B.


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Re: How to Safely Upgrade your All American pc [Re: Nature Boy]
    #22251641 - 09/17/15 03:00 PM (8 years, 4 months ago)

so the stop cock starts hissing steam, even if closed, at 30 PSI before the blow out plug goes boom?  thats good to know
is it supposed to literally blow out, or does it slowly release the over pressure?
seems like the former….would not be safe

High PSI and shaking jars by hand are the only two things that scare me in this hobby.



on my 921, the "caution" zone goes from 20-30PSI


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Re: How to Safely Upgrade your All American pc [Re: Nature Boy]
    #22251694 - 09/17/15 03:11 PM (8 years, 4 months ago)

Quote:

Nature Boy said:
I would imaging that jars with overly snug lids relying on the equalization provided only through a commercial filter would not react too well if the decompression was that catastrophic. :eek:



I think he meant in an empty run so nothing gets messed up.

FWIW, I was sterilizing some substrate bags in my 941 with the old stopcock a couple weeks ago and wasn't paying attention and the old stopcock popped on me. Was in my first post in this thread. https://www.shroomery.org/forums/showflat.php/Number/22146151#22146151

I tapped the stopcock back down with a wooden spoon after it blew open, and finished the run. I think after enough steam was vented the stopcock would close again, but I assisted it anyway. I was expecting a big shitty mess in the cooker from blown bags. But they were totally fine. I may just do that intentionally when I do my empty 941 test run tonight with the new stopcock. I don't think the new stopcocks will pop up like the old one. The design is totally different, the plunger isn't in an enclosed cylinder like a piston like the old model. I think the new ones will just push the plunger up enough to start venting steam right out the slits. It may whistle a bit.



Side question to everyone else in the thread.... Anyone ever have their PCs make loud "Ping" sounds? Every once in a while when bringing my PCs up to pressure they will make a loud PING. Like one of the wingnuts was a cunt hair loose and the lid expanding from the heat just made it tight. Just once during operation, not repeating pings. I tighten my wingnuts down as hard as I can and as evenly as possible, always inspecting the seal to make sure its even all around. I think I managed to get this on video a few months ago. I'll try to find it.

Even before the conversion my PCs would do this every once in a while. I actually watched the regulator weight literally jump straight up about and inch and drop right back down onto the vent pipe when this happened once. Only one time did I see the weight jump like that from the ping.


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RogerRabbit said:You need a bigger pressure cooker for this hobby. RR


Edited by Juiceh (09/17/15 03:13 PM)


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Invisibleblindingleaf
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Re: How to Safely Upgrade your All American pc [Re: Juiceh]
    #22251707 - 09/17/15 03:14 PM (8 years, 4 months ago)

yea, i get a ping with almost every cycle in the beginning.


the new stop cock seems to tight when its down though, is it manufactured to open a little bit with excessive pressure?  that would be awesome if u did that test run, but god damn either u are ballsy or i am the biggest pussy around PCs :facepalm:


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Re: How to Safely Upgrade your All American pc [Re: blindingleaf]
    #22251719 - 09/17/15 03:18 PM (8 years, 4 months ago)

You don't hear about many AA accidents to be fair. :shrug:  Gotta be dumb as fuck to blow the lid off one of those.


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Re: How to Safely Upgrade your All American pc [Re: blindingleaf]
    #22251723 - 09/17/15 03:19 PM (8 years, 4 months ago)

Quote:

blindingleaf said:
so the stop cock starts hissing steam, even if closed, at 30 PSI before the blow out plug goes boom?  thats good to know
is it supposed to literally blow out, or does it slowly release the over pressure?
seems like the former….would not be safe

High PSI and shaking jars by hand are the only two things that scare me in this hobby.



on my 921, the "caution" zone goes from 20-30PSI



Blow out plugs blow out completely. No slow release there, since at that point the goal is to bring the pressure down as quickly as possible.


Quote:

blindingleaf said:
yea, i get a ping with almost every cycle in the beginning.


the new stop cock seems to tight when its down though, is it manufactured to open a little bit with excessive pressure?  that would be awesome if u did that test run, but god damn either u are ballsy or i am the biggest pussy around PCs :facepalm:




The new stopcock will start to vent. If you let the cooker get to around 24psi you should start to see steam whisping out from under the deflector shield. One of the first few times I ran my cookers after the conversion I did this by accident.

Lets just say that I've worked with things in the past that make things like a pressure cooker operating at 20-30psi tame. :rofl:


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RogerRabbit said:You need a bigger pressure cooker for this hobby. RR


Edited by Juiceh (09/17/15 03:37 PM)


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InvisibleInocuole
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Re: How to Safely Upgrade your All American pc [Re: Juiceh]
    #22251731 - 09/17/15 03:21 PM (8 years, 4 months ago)

Does it shoot off like a cork?


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Re: How to Safely Upgrade your All American pc [Re: Juiceh]
    #22251737 - 09/17/15 03:22 PM (8 years, 4 months ago)

ok cool, glad to hear that.

i don't hear about many either, but a friend who works on boiler systems has shown me some pictures of a concrete wall that was hit with a 1/2" bolt pushed out of a faulty boiler at 8PSI.  it was scary.  i think the jigglier weight is safer in all honesty, but since my exhaust was broken anyway, i needed to replace the vent, so i just went with stop cock instead


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Re: How to Safely Upgrade your All American pc [Re: blindingleaf]
    #22251743 - 09/17/15 03:24 PM (8 years, 4 months ago)

I'm just fine with the jiggler weight with a few coins on it for now.  I'll let you test run this shit first.


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Re: How to Safely Upgrade your All American pc [Re: blindingleaf]
    #22251817 - 09/17/15 03:40 PM (8 years, 4 months ago)

The release valve blows before the plug Will blow. It's supposed to be like that. The rubber plug is a last resort that will not fail, unless it's blocked and sealed by something.

I have had the new pressure release valve open 3-5 times. I tap it with a spoon also. It scares me at first and the cats freak the fuck out. The pressure has dropped a few psi by the time I get to the kitchen. I would imagine the valve will stay open until it drops a few psi.
I actually noticed I can hear the valve leaking a bit when it gets close to 26psi.

Cooking at twenty psi is pretty dam safe with this upgrade. I would say completely safe, but I am sure people would like to argue. I cook at somewhere between 20-24psi now. Using the same cook times. I do not cook agar that hot. I usually do that around 12psi.

As for the pc plug going off with a bang, very doubtful. The bangs you hear with chemical explosions are sonic booms. Just like lightning. I doubt the plug flies out at over the speed of sound, although I am sure it halls ass.


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InvisibleInocuole
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Re: How to Safely Upgrade your All American pc [Re: tahoe]
    #22251826 - 09/17/15 03:42 PM (8 years, 4 months ago)

I bet it's at least pretty fuckin loud.


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Re: How to Safely Upgrade your All American pc [Re: Inocuole]
    #22251859 - 09/17/15 03:49 PM (8 years, 4 months ago)

Quote:

I cook at somewhere between 20-24psi now. Using the same cook times.




awesome, thats good to know.  i mainly wanted the upgrade for large bag runs.  i agree its safe, I'm just getting used to it is all.

with the jigglier weight, i would take naps, take dog for walk, go grocery shopping, etc (i wouldn't advocate people doing this unless they are 100% confident in PCing, i just knew my stove well enough it was second nature).  but with the stop cock, I'm not confident enough on heat setting to do that yet.


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Re: How to Safely Upgrade your All American pc [Re: Inocuole]
    #22251863 - 09/17/15 03:50 PM (8 years, 4 months ago)

Hey Inocuole, I've been thinking about taping a quarter to my toggle weight on my 23 quart Presto...it likes to hover around 14psi now...do you recommend it?


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Re: How to Safely Upgrade your All American pc [Re: Darkhome]
    #22251940 - 09/17/15 04:08 PM (8 years, 4 months ago)

Quote:

Darkhome said:
Hey Inocuole, I've been thinking about taping a quarter to my toggle weight on my 23 quart Presto...it likes to hover around 14psi now...do you recommend it?




Yea, a quarter will totally work. I just recently starting using a nickle on my 23qt weight, I really like it. I think there's only like a half gram in weight difference between a quarter and a nickle, pretty much the same. :thumbup:


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Re: How to Safely Upgrade your All American pc [Re: Darkhome]
    #22251942 - 09/17/15 04:09 PM (8 years, 4 months ago)

Dark. You would be fine doing that. A pc is not going to blow up with a rubber blow out plug in place. I feel confident saying that most if not all quality pressure cookers can withstand 100psi. I would imagine the blow out plug Will go well before that. No one is going to make a pc that cooks at 15psi but is structurally unsafe at 25psi. It's just not good.
Also think about propane canisters, air compressor's, etc. Those hold 80psi plus with no problems. Pc's are built as thick if not thicker. A pressure cooker truly blowing up is a thing of the past. Now keep in mind that a puffed up grow bag can block the jiggle weight, the blow plug, or valve. So take precaution not to let that happen.

The main things that would suck if a pressure cookers blow out plug went would be, scalding hot bird seed soup spouting across the kitchen. And that might not happen. Most likely be a spout of steam, some noise, and mild heart attack.

My aa pressure cooker creeks and pops also. It can be noisy and is almost always startling. On my 921 it was my indicator that it was getting close to 15-20 psi.
I believe the noise is caused by the lid reseating itself as the pressure rises.
I usually put a cool lid on a warming up pc. The lid and pot were once a solid piece when talking all American. As the pressure builds it pushes on the lid. The lid lifts a little and reseats itself in a different position.


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Re: How to Safely Upgrade your All American pc [Re: tahoe]
    #22252114 - 09/17/15 04:51 PM (8 years, 4 months ago)

Man, there is so much great info in this thread - 100% win!

N.B.


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Re: How to Safely Upgrade your All American pc [Re: Nature Boy]
    #22252140 - 09/17/15 04:56 PM (8 years, 4 months ago)

Quote:

The lid and pot were once a solid piece when talking all American. As the pressure builds it pushes on the lid. The lid lifts a little and reseats itself in a different position.




:themoreyouknow:

when i was a noob, i always thought it was cracking glass jars.  then when i started using bags, i realized that was not the case :facepalm:


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Re: How to Safely Upgrade your All American pc [Re: tahoe]
    #22252368 - 09/17/15 05:47 PM (8 years, 4 months ago)

Quote:

tahoe said:
My aa pressure cooker creeks and pops also. It can be noisy and is almost always startling. On my 921 it was my indicator that it was getting close to 15-20 psi.
I believe the noise is caused by the lid reseating itself as the pressure rises.
I usually put a cool lid on a warming up pc. The lid and pot were once a solid piece when talking all American. As the pressure builds it pushes on the lid. The lid lifts a little and reseats itself in a different position.



Cool, yeah that's what I figured. The lid was reseating. :thumbup:




Quote:

blindingleaf said:
when i was a noob, i always thought it was cracking glass jars.  then when i started using bags, i realized that was not the case :facepalm:



But, what did you think when you opened the cooker and no jars were cracked? Or were you somehow busting a jar every run? How were you blowing up so many jars?


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Edited by Juiceh (09/17/15 07:58 PM)


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