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Shop: Unfolding Nature Unfolding Nature: Being in the Implicate Order   North Spore Cultivation Supplies, Injection Grain Bag

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To vent, or not to vent? - Comparison * 7
    #29174485 -

I promised to do a comparison some time ago, to the actual temperature differences with venting and not venting.
It's a water immersion retort, the thermostat therefore has a roughly 10% offset, which is why it's set to 110C instead of 121C.


Completely shut w/o venting. Temperatures at 1bar/15psi:
71,8C = 161,24F




Completely shut w/o venting. Pressure at 121C/250F:
2,7bar = 39,2psi




Properly vented. Pressure at 121C/250F:




EDIT:
Having understood that I have made this more complicated than necessary, I'm reposting ReverendMyc's table, which he so kindly made! ☺️


--------------------
= Pressure needed to reach 121C/250F, should you decide not to vent =
= Cabin Sequestering FAQ (to roof, or not to roof?) =

"Assumption is the mother of all fuckups"

Edited by MycCycle (05/03/25 07:27 PM)

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Re: To vent, or not to vent? - Comparison [Re: MycCycle] * 1
    #29174559 -

so venting doesn’t do anything? I can’t read what you put, I may be retarded :lol:

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Re: To vent, or not to vent? - Comparison [Re: MycCycle] * 7
    #29174562 -

Hahah, let me try differently:
When you don't vent, the temperature at 15psi/1bar = 71,8C/161,24F
In order to reach 121C/250F, without venting, the pressure (at least in this example) has to be 2,7bar or 39,2psi.
When you vent properly, 15psi/1bar = 121/250F


--------------------
= Pressure needed to reach 121C/250F, should you decide not to vent =
= Cabin Sequestering FAQ (to roof, or not to roof?) =

"Assumption is the mother of all fuckups"

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Re: To vent, or not to vent? - Comparison [Re: MycCycle]
    #29174577 -

Haha ok I appreciate that! that makes sense.

So I have a spring type pc, can I just set it to pressure and let it vent out of that part?

I only ask because if it’s not at pressure a bunch of of steam escapes all around the handle and Ive almost went dry a couple times. I can control the water loss easier through the spring part

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Re: To vent, or not to vent? - Comparison [Re: san pedro guy]
    #29175303 -

It's hard for me to give an answer to that. Never seen or used those.

However, if it allows for steam to continuously escape for around 5-10 minutes before it "locks on", you should be alright. The equipment I can attach to mine for automatic venting locks on way sooner than when I do it manually, and the pressure/temps are still what it should be.

The general guidelines call for longer venting time for the sake of our health.
Worst case, in our instance, is that we have to throw out spawn.

I say try it, verify it.


--------------------
= Pressure needed to reach 121C/250F, should you decide not to vent =
= Cabin Sequestering FAQ (to roof, or not to roof?) =

"Assumption is the mother of all fuckups"

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Re: To vent, or not to vent? - Comparison [Re: MycCycle]
    #29175396 -

Yea, the only difference is the steam is escaping at a constant rate at pressure, not sure if that is any different than letting it vent before it gets up to 15psi

But appreciate the data, pretty awesome to see that I haven’t been wasting time venting :lol:

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Re: To vent, or not to vent? - Comparison [Re: MycCycle]
    #29175413 -

MycCycle said:
Hahah, let me try differently:
When you don't vent, the temperature at 15psi/1bar = 71,8C/161,24F
In order to reach 121C/250F, without venting, the pressure (at least in this example) has to be 2,7bar or 39,2psi.
When you vent properly, 15psi/1bar = 121/250F


I think the confusion is from inconsistent formatting with your numbers


--------------------
"Remember, kids, the difference between science and screwing around is writing it down" -adam savage
Flowchart for Recommended plan of action.
Learn the tried and true way to grow mushrooms
Use the Damn search engine
After you know what you're doing, take a break 
Pick a book, Make some chips!
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Re: To vent, or not to vent? - Comparison [Re: san pedro guy] * 1
    #29175627 -

tryptkaloids said:
MycCycle said:
Hahah, let me try differently:
When you don't vent, the temperature at 15psi/1bar = 71,8C/161,24F
In order to reach 121C/250F, without venting, the pressure (at least in this example) has to be 2,7bar or 39,2psi.
When you vent properly, 15psi/1bar = 121/250F


I think the confusion is from inconsistent formatting with your numbers


May I ask you to help me sort it out to make it more understandable?
It'll prove helpful to more people ☺️


san pedro guy said:
Yea, the only difference is the steam is escaping at a constant rate at pressure, not sure if that is any different than letting it vent before it gets up to 15psi

But appreciate the data, pretty awesome to see that I haven’t been wasting time venting :lol:


I've vented with the ball valve all the way open, and I've done it with it tightened to allow it to build pressure.
The only difference I notice is the noise and the "spitting" during the vent.
Might be different with other constructions, so I don't want to draw any conclusions there ☺️


--------------------
= Pressure needed to reach 121C/250F, should you decide not to vent =
= Cabin Sequestering FAQ (to roof, or not to roof?) =

"Assumption is the mother of all fuckups"

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Re: To vent, or not to vent? - Comparison [Re: MycCycle]
    #29175720 -

MycCycle said:
tryptkaloids said:
MycCycle said:
Hahah, let me try differently:
When you don't vent, the temperature at 15psi/1bar = 71,8C/161,24F
In order to reach 121C/250F, without venting, the pressure (at least in this example) has to be 2,7bar or 39,2psi.
When you vent properly, 15psi/1bar = 121/250F


I think the confusion is from inconsistent formatting with your numbers


May I ask you to help me sort it out to make it more understandable?
It'll prove helpful to more people ☺️



For me it would be easier if you rounded to whole numbers, or used decimal points instead of commas.

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Re: To vent, or not to vent? - Comparison [Re: psilygoose]
    #29175727 -

That's them non freedom units

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Re: To vent, or not to vent? - Comparison [Re: LewDoja] * 1
    #29175730 -

LewDoja said:
That's them non freedom units


Yeah I figured that's why I left the "bar" alone lol.

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Re: To vent, or not to vent? - Comparison [Re: MycCycle]
    #29175750 -

Nice work. Decimals are less confusing than apostrophes. Perhaps that's the formatting issue he was referring to?

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Re: To vent, or not to vent? - Comparison [Re: Stipe-n Cap]
    #29175754 -

——————Vent      - No Vent 
                      ------------------- 
Time      - 
Temp      - 
Pressure  -


I’m not too savvy on formatting but something like this is what I find easy to read and understand

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Re: To vent, or not to vent? - Comparison [Re: san pedro guy] * 4
    #29175763 -



Formatting charts in html is messy so I usually upload screen captures from Excel.
Time depends on what is being sterilized.


--------------------
Stoned Gummys | BRF Pucks | Primo Reusable Plates | Easy LI 4 Preserv & Propo
"Psychedelics are powerful substances. Nothing that powerful is completely safe... and nothing completely safe is that powerful!" - Abigail Calder at ALPS 2023
Don't Panic

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Re: To vent, or not to vent? - Comparison [Re: ReverendMyc] * 4
    #29175769 -

Tidy.

This is an excellent post, OP. I didn't expect 39 psi, very illustrative.

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Re: To vent, or not to vent? - Comparison [Re: Stipe-n Cap]
    #29175796 -

What system gets that high? Like what brand of pressure cooker are you using that allows you to get up to 39 psi? We pressurize the stainless steel trailers that I haul up to 30 PSI before the blow off valve kicks in and even that scares the crap out of me. I rarely go above 20


--------------------
I've got skills, they don't know where to use me
I'm like the best dressed guy at the nude beach
Nice to meet you!

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Re: To vent, or not to vent? - Comparison [Re: Stipe-n Cap] * 1
    #29175811 -

Stipe-n Cap said:
Nice work. Decimals are less confusing than apostrophes. Perhaps that's the formatting issue he was referring to?


Op is written

Bar/psi
C = f

Then it goes

C/F
Bar = psi

Then just
C/F 

Id have kept the pressure readings split with a slash and the temp split with the = but maybe im being pedantic


--------------------
"Remember, kids, the difference between science and screwing around is writing it down" -adam savage
Flowchart for Recommended plan of action.
Learn the tried and true way to grow mushrooms
Use the Damn search engine
After you know what you're doing, take a break 
Pick a book, Make some chips!
Josex said:Don't take the site seriously bro, ain't worth it.
 

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Re: To vent, or not to vent? - Comparison [Re: PuffM4gicDr4gon] * 2
    #29175865 -

PuffM4gicDr4gon said:
What system gets that high? Like what brand of pressure cooker are you using that allows you to get up to 39 psi? We pressurize the stainless steel trailers that I haul up to 30 PSI before the blow off valve kicks in and even that scares the crap out of me. I rarely go above 20


There's nothing the average person owns that can go that high and I think that's an important data point to understand. If you're not venting you have no possible means of attaining 121°C. You require special equipment.

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Re: To vent, or not to vent? - Comparison [Re: Stipe-n Cap] * 1
    #29175869 -

Totally understand that part. I've been sold on venting for a long time now. I do it every time. It's just that 39 PSI is a ridiculous amount of contained energy and I'm curious how that was achieved safely. Not to try to recreate it or to buy that equipment or anything like that just for the sake of curiosity


--------------------
I've got skills, they don't know where to use me
I'm like the best dressed guy at the nude beach
Nice to meet you!

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Re: To vent, or not to vent? - Comparison [Re: MycCycle] * 3
    #29175874 -

MC, that's a good point. An equipment list would be an interesting addition to the post.

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Shop: Unfolding Nature Unfolding Nature: Being in the Implicate Order   North Spore Cultivation Supplies, Injection Grain Bag

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