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blackout


Registered: 07/16/00
Posts: 5,266
Last seen: 2 months, 24 days
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Re: custom pressure cooker [Re: NumeroEno] 1
#21739765 - 05/30/15 04:19 AM (8 years, 7 months ago) |
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I work with pressure boilers of a similar enough size. They are 1.5mm thick wall, and 5mm thick base & lids. I have tested them to 100psi with air.
I would recommend treating the welds, pickling paste, acid treat or whatever the welder has. Citric acid is easily got and is better than nothing.
I would always pressure test it first with air or cold water. If you are testing boiling actual water in it then I would use very little water, certainly not 6 gallons as that's a huge amount of energy to be released if it failed. It doesn't look like any welds would fail but just warning others if they tried a similar thing.
I have used rubber tubing to connect different diameter pipes together, i.e. I cut a section out and pulled it over the two mating tubes. The rubber does not hold up to temperature at all, goes sort of brittle. An easy source of gaskets is silicone baking sheets, which are just big rubber sheets about 1.5 or 2mm thick -very cheap compared to trying to get silicone sheeting from some industry suppliers. If you cannot get them the silicone should be fine. On yours I would possibly put silicone on the uneven side and then put my cut out baking sheet gasket on top of that. This would give a nice smooth top to it and it should not adhere to the lid. If you use just silicone sealant as a gasket it can tend to lift/pull off when up pull the mating part off. You can use plumber grease or vaseline to lower the chance of that.
In this old thread I described a way to make one from a keg, with no welding needed at all. http://www.shroomery.org/forums/showflat.php/Number/10891050
Quote:
blackout said: Another option is to simply use an existing pressure cooker, cut a hold in the bottom, and a matching hole in the top of the keg, then they could be welded together. This could be bolted too, the dome shape is a problem though. I would cut a hole in the bottom of the pressure cooker which is about 40mm in from the outside diameter. Now you could drill an array of holes around the inner edge, and cut a similar hole and holes in the keg. Now you will need a very thick gasket to sit on the lid, now you use nuts & bolts to lock them together. The gasket will sit outside of the bolts so there is no need for sealing.
The downside to this is that your opening hole in the keg is not as wide.
You could insulate the sides of it, I would say it is outputting/losing about 500W or more when its at full temp.
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: custom pressure cooker [Re: blackout]
#21739914 - 05/30/15 06:33 AM (8 years, 7 months ago) |
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Paste is cheap usually hydrofluoric based. Those welds dont have any defects though. You only have to pickle stainless welds if they look ugly. It wouldnt hurt but I probably wouldn't bother
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blackout


Registered: 07/16/00
Posts: 5,266
Last seen: 2 months, 24 days
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Re: custom pressure cooker [Re: bodhisatta] 1
#21740173 - 05/30/15 08:44 AM (8 years, 7 months ago) |
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I have examined enough failed tanks in my time to convince me its very worthwhile, I would certainly do it if I had got that tank made up for me. People reading your post might get the impression it is purely cosmetic.
Many manufacturers will not bother treating the outside welds and just do the internal ones which will be in contact with water.
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azur
God of Fuck



Registered: 04/21/12
Posts: 28,103
Loc: Daid
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Re: custom pressure cooker [Re: blackout] 1
#21740195 - 05/30/15 08:52 AM (8 years, 7 months ago) |
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I think I'll treat the welds. Btw, all the welds are on the outside. I like your idea about the silicone baking sheets. I'll try to locate one today.
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: custom pressure cooker [Re: blackout]
#21740199 - 05/30/15 08:53 AM (8 years, 7 months ago) |
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http://www.avestafinishing.com/products/pickling-paste.aspx this is all I've ever used, trust me though it's not fume free.
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blackout


Registered: 07/16/00
Posts: 5,266
Last seen: 2 months, 24 days
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Re: custom pressure cooker [Re: azur] 1
#21740262 - 05/30/15 09:16 AM (8 years, 7 months ago) |
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Quote:
azur said: I think I'll treat the welds. Btw, all the welds are on the outside.
Most of the tanks I work with are welded on the outside too, but if they are only going to get one treatment of paste, then it's on the inside. Get it right into any crevices, if there are any.
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azur
God of Fuck



Registered: 04/21/12
Posts: 28,103
Loc: Daid
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Re: custom pressure cooker [Re: blackout]
#21740350 - 05/30/15 09:44 AM (8 years, 7 months ago) |
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azur
God of Fuck



Registered: 04/21/12
Posts: 28,103
Loc: Daid
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Re: custom pressure cooker [Re: azur]
#21746331 - 05/31/15 09:01 PM (8 years, 7 months ago) |
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Alright. Got her running on a decent idle at 15 psi. Used a silicone bead around the lip of the pot. Seems to have done the trick. Took about 50 min to steam out and get to 15. The amount of fuel it's using is just slightly higher than i use on a 941. So that is a great thing. Though it does take a considerable amount of fuel to get up to temp. All in all, it will still use less fuel in one run than 3 runs with a 941 and will triple my production rate.
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Imperfect Iam
^means imperfect,not I'm perfect


Registered: 03/05/13
Posts: 7,237
Loc: center of the universe
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Re: custom pressure cooker [Re: azur]
#21746341 - 05/31/15 09:04 PM (8 years, 7 months ago) |
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Well done azur
-------------------- All you touch, and all you see, is all your life will ever be- Pink Floyd Life is what happens while you're busy making other plans- John Lennon
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azur
God of Fuck



Registered: 04/21/12
Posts: 28,103
Loc: Daid
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Thanks mang!
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Mad Season
hookers and blackjack



Registered: 09/16/12
Posts: 12,666
Loc: Canada
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Re: custom pressure cooker [Re: azur]
#21746483 - 05/31/15 09:41 PM (8 years, 7 months ago) |
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glad to hear the silicone worked. This is pretty inspiring. Definitely think this is feasible and by the sounds of it pretty damn cheap compared to 3 pcs lol
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azur
God of Fuck



Registered: 04/21/12
Posts: 28,103
Loc: Daid
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Re: custom pressure cooker [Re: Mad Season]
#21746528 - 05/31/15 09:52 PM (8 years, 7 months ago) |
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Hell yea. I'll see how the next couple of months go and if i have the time to up production even more I'll build another one
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insanemike

Registered: 02/23/14
Posts: 4,272
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Re: custom pressure cooker [Re: azur]
#21747372 - 06/01/15 05:00 AM (8 years, 7 months ago) |
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eatyualive
Eat's You Alive :)



Registered: 08/17/01
Posts: 19,026
Loc: In Your Head
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Re: custom pressure cooker [Re: azur]
#21747403 - 06/01/15 05:33 AM (8 years, 7 months ago) |
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rxb
n00b-sabot



Registered: 08/24/13
Posts: 9,521
Loc: FREE PSYCHONAUTICA
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Re: custom pressure cooker [Re: eatyualive]
#21747424 - 06/01/15 05:54 AM (8 years, 7 months ago) |
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5 silicone mushies to meee?
-------------------- ->$10 FLOW HOOD ALTERNATIVE <- . i cleaned a mold contaminated live culture and saved it. (might have useful applications) [quote]Enlil said: I'd be the guy with thousands of minions doing my bidding and all of the hot women locked in a cage for my use.[/quote]
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Jenn
Supreme Leader



Registered: 04/27/15
Posts: 200
Last seen: 7 years, 11 months
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Re: custom pressure cooker [Re: rxb]
#21748301 - 06/01/15 12:35 PM (8 years, 7 months ago) |
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I made a post with this question. Sorry I am posting it here too. I need an answer fast as I'm sterilizing as I typeI need a fast answer. My manual to my 75x says to let the valve stay open for 5 minutes to let air escape. Then to close it until it reaches 17 psi. The once it's there, open it again for 3 to 5 minutes. After that it tells you to start the clock.
Will this be a bad idea ?
What should I do?
-------------------- Sit down before fact as a little child, be prepared to give up every preconceived notion, follow humbly wherever and to whatever abysses nature leads, or you shall learn nothing.
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Achillita
Back to the basics



Registered: 05/26/14
Posts: 4,565
Last seen: 3 years, 10 days
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Re: custom pressure cooker [Re: Jenn]
#21748319 - 06/01/15 12:40 PM (8 years, 7 months ago) |
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Don't do that. Bad idea. Just get it to 15 psi and leave it there.
What manual are you using for godsakes?!?
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Jenn
Supreme Leader



Registered: 04/27/15
Posts: 200
Last seen: 7 years, 11 months
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Re: custom pressure cooker [Re: Achillita]
#21748326 - 06/01/15 12:42 PM (8 years, 7 months ago) |
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The one that came with my All American 75x 41.5 quart electric sterilizer.
-------------------- Sit down before fact as a little child, be prepared to give up every preconceived notion, follow humbly wherever and to whatever abysses nature leads, or you shall learn nothing.
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Achillita
Back to the basics



Registered: 05/26/14
Posts: 4,565
Last seen: 3 years, 10 days
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Re: custom pressure cooker [Re: Jenn]
#21748334 - 06/01/15 12:44 PM (8 years, 7 months ago) |
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Well I've never heard of doing that, and I would personally highly advise not doing that.
But I don't own an all American. Maybe someone else who owns one.
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Jenn
Supreme Leader



Registered: 04/27/15
Posts: 200
Last seen: 7 years, 11 months
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Re: custom pressure cooker [Re: Jenn]
#21748337 - 06/01/15 12:44 PM (8 years, 7 months ago) |
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Log in to view attachment
This one.
-------------------- Sit down before fact as a little child, be prepared to give up every preconceived notion, follow humbly wherever and to whatever abysses nature leads, or you shall learn nothing.
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