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Invisiblethe_damn


Registered: 08/26/11
Posts: 383
Loc: Hell Flag
How many large spawn bags in an AA941
    #21249166 - 02/09/15 03:41 PM (9 years, 11 months ago)

So I got my hands on one of those bigass AA941s.  I've tried searching, but can't seem to find how many ~4qt. bags people tend to fit in these things.  I'm trying to gauge how much grain to prep.  I bought these bags, and my plan is to vac&seal four quarts of hydrated rye berries in them and PC as many as possible.  (Haven't used this big bitch PC yet.)

I read on here somewhere that it would suffice to PC at 13psi for three hours.  The slightly lower pressure to preserve water I think...

Also, any tips on the vac&seal process?  I have an old FoodSaver that I was planning on using for the initial vac&seal, not sure if that will work very well, and I have an impulse sealer that I was going to use after that (to get a good seal before the PC).


Thanks!


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InvisibleJuiceh
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Registered: 09/25/12
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Re: How many large spawn bags in an AA941 [Re: the_damn]
    #21249270 - 02/09/15 04:07 PM (9 years, 11 months ago)

I'm not sure you can seal those bags before pressure cooking. As far as I know I think the only bags you can seal before PCing are the ones with 5 micron filters. Not the .5 or .2 micron filters. You can use a tyvek sleeve in the neck of the bag and fold them accordion style, or just fold the end of the bag under the bag when loading into the PC. Then you will have to seal them after the cook cycle. I once tried to seal an XL bag of grain in my 921, the bag had a filter patch, I think it was a .5 micron. There was a weight on top to hold the bag all curled up and sealed. Total disaster. The bag expanded and ruptured in the PC.

I don't know how many bags of that size you can fit in a AA941. I can fit 6 of them in my AA930 stacking 3 high. The 941 is the same height, but it has a 3" wider width, so I'm not sure if you will actually be able to fit more of these size bags in there than 6. If you could fit 9 in there that would rock!

Here is a pic of my 930 next to the stack of bags:

The bags are loaded with about 6.5-7lbs of substrate.


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How I make 15 lbs of casing in a 941. How I line 12 shoeboxes with 1 39gal bag. How I Deep Fry Cubes!
RogerRabbit said:You need a bigger pressure cooker for this hobby. RR

Edited by Juiceh (02/09/15 04:34 PM)

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Invisiblethe_damn


Registered: 08/26/11
Posts: 383
Loc: Hell Flag
Re: How many large spawn bags in an AA941 [Re: Juiceh]
    #21249348 - 02/09/15 04:27 PM (9 years, 11 months ago)

Well, shit.  I have tried the tyvek sleeve method before, but I contam every time.  Granted my flowhood was compromised with a small hole in the filter, but I do not have the time or money for another flowhood right now.  My plan was to seal the bags before the PC and then knock them up with tested LC through the SHIP.

Are 5 micron bags suitable for mycology?  Or is there some other way for me to make this work (besides the tyvek sleeve + flowhood)?

I really would like to seal the bags before PC and use LC via SHIP, because this seems like the least error-prone method for me.


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I'll be damn...

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InvisibleAIRDOG
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Registered: 10/16/99
Posts: 3,493
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Re: How many large spawn bags in an AA941 [Re: the_damn]
    #21249379 - 02/09/15 04:35 PM (9 years, 11 months ago)

Quote:

the_damn said:
Well, shit.  I have tried the tyvek sleeve method before, but I contam every time.  Granted my flowhood was compromised with a small hole in the filter, but I do not have the time or money for another flowhood right now.  My plan was to seal the bags before the PC and then knock them up with tested LC through the SHIP.

Are 5 micron bags suitable for mycology?  Or is there some other way for me to make this work (besides the tyvek sleeve + flowhood)?

I really would like to seal the bags before PC and use LC via SHIP, because this seems like the least error-prone method for me.




I seal the ends of my bags with painters masking tape... wich tears easily after PC

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Invisiblethe_damn


Registered: 08/26/11
Posts: 383
Loc: Hell Flag
Re: How many large spawn bags in an AA941 [Re: AIRDOG]
    #21251448 - 02/09/15 11:38 PM (9 years, 11 months ago)

I searched and found a post where someone mentions sealing the bags with a cotton ball in the middle of the seal, to prevent exploding and also provide some air filtering after the PC.  I am going to try this I suppose, and then seal the bags below the cotton ball after sterilizing.  How does that sound?  I'm also wondering if I should use cotton or polyfill, or if it matters...?

I will start with six bags to prevent having any waste, and then if I feel I can squeeze more in I will try it next time.

Thanks all!


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Invisiblethe_damn


Registered: 08/26/11
Posts: 383
Loc: Hell Flag
Re: How many large spawn bags in an AA941 [Re: the_damn]
    #21254286 - 02/10/15 05:11 PM (9 years, 11 months ago)

Any input on that last bit?


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I'll be damn...

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InvisiblePirateSwazey
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Re: How many large spawn bags in an AA941 [Re: the_damn]
    #21254319 - 02/10/15 05:16 PM (9 years, 11 months ago)

.5 micron are fine and you can pre seal them before you PC.

I believe the 941 can hold 6 bags but don't quote me on that.

Should take about 25lbs of rye to fill up 6 bags @ 4-4.5 qts.



edit: sorry I miscalculated that, it should be more around 20lbs or 14 dry quarts for 6 bags, so a little less than 1/2 of a 50# bag!


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BULK RYE PREP  -  MY FAVORITE THREADS  -  BUILD A FLOWHOOD


Edited by PirateSwazey (02/10/15 08:18 PM)

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OfflineIron.Myke
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Registered: 02/05/15
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Re: How many large spawn bags in an AA941 [Re: the_damn]
    #21254552 - 02/10/15 05:52 PM (9 years, 11 months ago)

Quote:

the_damn said:
So I got my hands on one of those bigass AA941s.  I've tried searching, but can't seem to find how many ~4qt. bags people tend to fit in these things.  I'm trying to gauge how much grain to prep.  I bought these bags, and my plan is to vac&seal four quarts of hydrated rye berries in them and PC as many as possible.  (Haven't used this big bitch PC yet.)

I read on here somewhere that it would suffice to PC at 13psi for three hours.  The slightly lower pressure to preserve water I think...

Also, any tips on the vac&seal process?  I have an old FoodSaver that I was planning on using for the initial vac&seal, not sure if that will work very well, and I have an impulse sealer that I was going to use after that (to get a good seal before the PC).


Thanks!



Don't seal your bags before PC'ing them, or they will burst.
Also, you don't want your grain bag substrates in a vacuum.
You want them to have an sterile air plenum.
A sterile air plenum inserted into the spawn bag before sealing the bag just prior to inoculation aids in the providing of ample GE for the colonizing mycelium.

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Invisiblethe_damn


Registered: 08/26/11
Posts: 383
Loc: Hell Flag
Re: How many large spawn bags in an AA941 [Re: Iron.Myke]
    #21254852 - 02/10/15 06:44 PM (9 years, 11 months ago)

Thanks for the input guys.  You two seem to be giving me conflicting advice though, and you didn't answer my god damn questions :mad:

Just kidding.  But I am seriously wondering about the feasibility of sealing a flattened cotton ball into the bag's seal before PC -- sort of a common ground between presealing vs. the tyvek sleeve method.  Has anyone tried this cotton-ball-seal method with success?  Would polyfill be better, if I try?

Quote:

A sterile air plenum inserted into the spawn bag before sealing the bag just prior to inoculation aids in the providing of ample GE for the colonizing mycelium.




I believe you can hang the bags to get a decent plenum sucked in through the filter patch.  I am ok with a bit slower colonization if it means I will be successful in this method/endeavor.


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OfflineIron.Myke
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Registered: 02/05/15
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Re: How many large spawn bags in an AA941 [Re: the_damn]
    #21254910 - 02/10/15 06:52 PM (9 years, 11 months ago)

Stuff polyfill into an emptied syringe barrel.
Tie apparatus into the end of the bags with zip-ties, or tie-wire, loaf of bread-style.
Cover apparatus with foil during PC'ing.
Inoculate through bag with flame sterilized syringe inoculm.

Cover inoculation hole with a 1 inch squared piece of clear packers tape.
Incubate at 72-75F.

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InvisiblePirateSwazey
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Re: How many large spawn bags in an AA941 [Re: Iron.Myke]
    #21255398 - 02/10/15 08:09 PM (9 years, 11 months ago)

Sorry I can't answer your question about the cotton... I have no experience in doing something like that. Mainly just replied to your OP anyway, I hadn't read the entire thread.

Anyhoo I've been using .5 micron bags and sealing them before sterilizing for about 1 and a half years now... Probably make about 30 a week to keep my lil farm fed & never have them burst... If I were you I would just buy new bags. Wish I could help more!


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BULK RYE PREP  -  MY FAVORITE THREADS  -  BUILD A FLOWHOOD


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Invisiblethe_damn


Registered: 08/26/11
Posts: 383
Loc: Hell Flag
Re: How many large spawn bags in an AA941 [Re: PirateSwazey]
    #21255761 - 02/10/15 09:18 PM (9 years, 11 months ago)

Thanks for all the input everyone.  I was just kidding in my last comment, as all contributions are always welcome.  The lesson I am learning here is that I have lots of methods to try -- always best to diversify!

PirateSwazey, you say you preseal .5 micron bags?  Or did you mean 5 micron bags?  From what I have read and everyone says, the .5 micron bags are prone to burst.  If you can get away with them not bursting then I might give it a try.  What tek/equip are you using for sterilization -- 15psi for 2-3 hours?


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InvisiblePirateSwazey
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Re: How many large spawn bags in an AA941 [Re: the_damn]
    #21255933 - 02/10/15 09:45 PM (9 years, 11 months ago)

They are .5 micron. I have used them from several different vendors and they all have worked just fine.

No ''tek'' that I follow per se... I sterilize mine for 2.5hrs @ 17psi in AA-25X stereoclaves.

Anyways I think a lot of people say that you can't pre seal bags when they haven't actually tried it :shrug:


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BULK RYE PREP  -  MY FAVORITE THREADS  -  BUILD A FLOWHOOD


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Invisiblethe_damn


Registered: 08/26/11
Posts: 383
Loc: Hell Flag
Re: How many large spawn bags in an AA941 [Re: PirateSwazey]
    #21349642 - 03/01/15 07:54 PM (9 years, 10 months ago)

My AA941 is going through its first run now.  I haven't had much spare time lately, but I finally got around to prepping some grain.  I managed to fit eight bags (~4qt) in there -- not bad!

I have a question though.  My AA941 pressure regulator weight seems to be jiggling constantly at around 13-13.5 PSI, with a steady flow of steam coming out of the vent.  I am cooking with propane, outside, and it is around 37F degrees... so perhaps the low temps is why I my regulator is jiggling ahead of 15 PSI??

I was going to run at 13-13.5 PSI for three hours, but with the steam coming out like that I am hoping I can make it that long...


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Invisiblefilthyknees
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Re: How many large spawn bags in an AA941 [Re: the_damn]
    #21349668 - 03/01/15 08:02 PM (9 years, 10 months ago)

I found that mine does the same thing(indoors on a stove).
What I figure is the weight is approximate and the gauge is really what should be paid attention to.
As for the amount of water: i hope you guessed right :justdontknow: :peace:

edit:

>>steady flow of steam

from under the weight? should be more like sputtering not constant


--------------------
But if you're in a hurry, and really got to go
If you're in a hurry, might have to find out slow
That it's one thing to try and another to fly
You get there quicker just a step at a time
It's one thing to bark, another to bite
The show ain't over till you pack up at night

Edited by filthyknees (03/01/15 08:06 PM)

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Invisiblethe_damn


Registered: 08/26/11
Posts: 383
Loc: Hell Flag
Re: How many large spawn bags in an AA941 [Re: filthyknees]
    #21349689 - 03/01/15 08:10 PM (9 years, 10 months ago)

Well, I am not comfortable concluding that one or the other is accurate without knowing or having a decent idea.  The gauge could be defective for all I know, and personally I would put more confidence in the weight... but that's just my gut, heh.

I figure that, if the gauge says 13.5 PSI and the weight is dancing, I am at atleast 13.5 PSI (perhaps more likely higher)... which is what I was going for.  But, yea, I just hope the water lasts.


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OfflinehamloafM
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Re: How many large spawn bags in an AA941 [Re: the_damn]
    #21349709 - 03/01/15 08:14 PM (9 years, 10 months ago)

I fit 9, 4 quart bags comfortably in the AA941 & 8, 4 quart bags in the AAx75's.  With the AA941 PC, for lengthy sterilization cycles, the pressure regulator weight should be replaced with the capillary tube, and stopcock modification, or more water needs to be added to the PC.


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Invisiblethe_damn


Registered: 08/26/11
Posts: 383
Loc: Hell Flag
Re: How many large spawn bags in an AA941 [Re: hamloaf]
    #21351076 - 03/02/15 08:57 AM (9 years, 10 months ago)

So just to report back, my eight bags made it through the ~3 hour cook just fine, and the water was sufficient.  I kept the pressure around 13-13.5 PSI.

I am actually pretty surprised, because I presealed half of the bags (.5 micron) but they did not burst, despite it being below 40F degrees outside.  I did not gradually cool the cooker down, and with my luck and those environmental factors I figured for sure I was going to waste half of that shit.  Lucky me.

With the other four bags, I tried what I mentioned earlier in this thread: Sealing cotton balls or polyfill into the 'preseal' to allow for ventilation.  I tried cotton on two bags, poly on the other two, and both seemed to work fine.  I will go with cotton if I do that again, as the poly melts along with the bag plastic which I don't think is a good thing.

Thanks for all the input.


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