stainless recovery tank

[Sextracts]

The issue is what happens when things go wrong and is why most pressure vessels have spun hemispherical heads instead of flat lids.

It is easy to hold pressure with the wrappers, because the metal is in pure tension, and has about a 40/60,000 psi yield in that direction.

The ends are under pure tension, only after they have deflected into a hemispherical shape. Usually the heat affected zones around the welds will fail before they reach that shape.

To keep the ends from assuming a hemispherical shape requires that they be thicker. On a tank 12" in diameter, to hold them flat within a few thousandths of an inch, would require lids one to two inches thick, or with ribs that high. If you look at the thin cans, they have both a hemispherical top and inverted hemispherical bottom, which puts the metal in compression, where it is even stronger.

The only way to use thinner tops and bottoms that I'm aware of, is to protect them with pressure relief valves. In the case of flammable gases, we generally try to keep from venting them haphazardly, soooo, if you look at the refrigerant tanks built and certified as pressure vessels by ASME and for transportation by DOT, you will see that they have hemi heads and are rated for 350 psi and up.

Building pressure vessels carries liabilities cradle to grave that should not be taken casually, and I would rather not add that liability.

They do have pressure release valves on the bhogart, although I do see some design flaws, my tank has naturally became bowed out over time

 

[Gray Wolf]

They do have pressure release valves on the bhogart, although I do see some design flaws, my tank has naturally became bowed out over time

Yup, that is what happens. Now look at how the stresses are being applied at the welds. They aren't in tension, you have a bending moment.

You can buy spun hemispherical heads, and are as easy to weld on as a flat plate.

 

[A6 Grower]

Ive wanted a SS recovery tank for a while. I noticed if you dont purge out the water in the recovery tank it will start to rust pretty quick. I run 8-12 tubes(1.5x28 180-200g each) a day and purge my tank every other week. I've opened up my first recovery tank and looked around the inside to see a tons or gross slug and stuff in the tank. Replacing my filter dryers every other week or so helps a little from what ive noticed.

 

[cyphaman]

the BigFoot Extractors look like the they have the right shaping to their recovery tanks. Maybe these could be a good buy especially for someone like myself looking for a smaller tank? I still need to be able to clean it out though.

Great thread RB, thanks to your and GW and everyone contributing I am learning a lot.

 

[cyphaman]

https://www.facebook.com/BigHugeOil

 

[cyphaman]

oh my bad these are passive?

 

[C'Ya]

Hate to bring up the subject again(different thread) but why isn't aluminum tank a solution their rated at min. of 240psi, have spun hemi heads, are available with 1-5 threaded fittings and if using 33lbs cylinder comes with liquid withdrawal valve(tube) and 20lbs are not hard to convert.
And normally come with threaded pressure release making it easy to pipe to another tank or outside for those times it blows. And aluminum is often used in cryogenics.
Did I mention their already available and don't rust like steel and heat transfer is better than steel.
I haven't checked pressure at tank during recovery, but I'd assume butane is lower pressure than propane, steel hvac recovery tanks are rated at 400psi, but that's due to higher pressure refrigerant recovery.
Any thought's? I will begin testing on tank I have on hand but got alot on my plate and any help is always welcome.
Thanks C

 

[C'Ya]

A 20lb propane is same size as 50lb recovery tank in water cap.

 

[Randomfox]

the design is flawed. For reasons due to pressure, you almost always see a curved design. If you didn't have an engineer design your system and you had no understanding of things such as that, it would seem to make sense that you could just take some stainless pipe and weld ends on it and call it good.

do you want something that might be sufficient or would you want to know that the tank you were using was tested for use at 400psi with an even higher burst rating? I mean a tank of butane could make one hell of a bomb if it ruptured, and things such as that never happen at ideal moments. :/

RB

I want to talk to you but just signed up and can't pm you. Can you pm me or send an email.
my email is randomfox1111@gmail.com

 

[krunchbubble]

RB

I want to talk to you but just signed up and can't pm you. Can you pm me or send an email.
my email is randomfox1111@gmail.com

Redbeard is a known fraud and scam artist, NOT a well liked kat here...

 

[Pure777Extracts]

I would be in for one

 

[Chonkski]

I would hold customers hands and train them.

I love teaching about my system more than I like running my system.

Lulz