Help How to know your Nitrogen tank/cylinder has been filled with 20 cf or 40 cf (of Nitrogen gas)?

[how2toGetout]

How do you know if your arrived Nitrogen tank/cylinder has been filled with 20 cf (cubic feet) or 40 cf (of Nitrogen gas)?

The tank size (that is, the dimension of the tank) would stay the same regardless whether it's 20 cf or 40 cf (of Nitrogen gas), right?
Say, you buy a 'TurboTorch Inert Gas Cylinder - 40 Cubic Foot 0916-0028' from cyber weld. That tank has a dimension of 7.0"OD X 17.5"H (what does OD mean in this case?)
Or, say, you buy a empty tank/cylinder from a local shop, then the size of tank/cylinder COULD be different from the one you may order from cyber weld, right?


So, how do you know if your tank was filled truly with 40 cf (if you ordered 40 cf instead of 20 cf), and not with 20 cf (of nitrogen gas)?

Do you need to attach a regulator/flowmeter? To check the gas pressure inside the tank?

 

[Lookingforabus]

OD means "outside diameter".

Before you order anything online, check your local suppliers. In my area, the biggest one with the best reputation doesn't do tank fills or refills, they swap your empty tank with one of their full ones (or will sell you one of theirs). No point in ordering a shiny new one if they're just going to swap it out.

And yes, you should attach a regulator of some sort to the tank to measure the pressure. And test, and maybe empty the tank at your desired flow rate to make sure you have as much time as you desire, then get it refilled and check the pressure again to make sure it matches the reading you tested with.

 

[how2toGetout]

And yes, you should attach a regulator of some sort to the tank to measure the pressure. And test, and maybe empty the tank at your desired flow rate to make sure you have as much time as you desire, then get it refilled and check the pressure again to make sure it matches the reading you tested with.

How do you empty the tank and then refill it? Is there a way to empty one tank into the other? Or are you talking about emptying the tank to check the actual load/fill level of the tank (then those nitrogen would get lost to the atmosphere), and then get the empty tank refilled in a local supplier?

 

[Lookingforabus]

Or are you talking about emptying the tank to check the actual load/fill level of the tank (then those nitrogen would get lost to the atmosphere), and then get the empty tank refilled in a local supplier?

That.

 

[how2toGetout]

That.

So your point is that we can check the online supplier's tank to see if they had filled the tank correctly to the displayed volume of the gas (e.g. 40 cf if product says 40 cf, and 20 cf if it said 20 cf, etc.) before shipping the tank. To Test the dependability/confidentiality of the online supplier. I wonder if anyone has done this for the supplier Cyber weld. I am not currently in a situation to order from cyber weld yet, but plan to do so in the next few months or so. Can anyone let us know if they have tested the actual volume of the inert gas from the tanks that they received from online suppliers like Cyber weld?

Is there any other method to tell if your tank was filled to the displayed volume on the website? Or, is the dependability/confidentiality mostly based on the reputation of the supplier?

 

[Lookingforabus]

I got mine in person, so I can't speak about online purchases (are you sure they ship filled, though? Most places ship empty, because of restrictions and expense around shipping dangerous cargo, like compressed gas.)

And yeah, reputation matters, but as Russians (and security and intelligence types) say, "trust but verify". So go with a reputable vendor, and verify that they sent you what they claim.

 

[how2toGetout]

I got mine in person, so I can't speak about online purchases (are you sure they ship filled, though? Most places ship empty, because of restrictions and expense around shipping dangerous cargo, like compressed gas.)

And yeah, reputation matters, but as Russians (and security and intelligence types) say, "trust but verify". So go with a reputable vendor, and verify that they sent you what they claim.

I am not currently in a situation to order from cyber weld yet, but plan to do so in the next few months or so. Yes, I want to test and verify.

I got mine in person, so I can't speak about online purchases (are you sure they ship filled, though? Most places ship empty, because of restrictions and expense around shipping dangerous cargo, like compressed gas.)

Cyber weld has the option to ship it filled with a gas of your choice (Argon, Nitrogen ,etc.)
I hear that it has to be shipped ground when tank is filled. That's the only restriction i've heard of for shipping a filled gas tank.

 

[Nitromask]

I'm confused by your initial question...

Why would you think the tanks are the same size? Of course they're not.

40 cubic ft tank is 7"x17.5"
20 cubic ft tank is 5.25"x13.75"


EDIT: Actually, ignore me - I just re-read your question haha. They are a reputable seller though, so nothing to worry about imo, but yes of course you will need a regulator

 

[how2toGetout]

I'm confused by your initial question...

Why would you think the tanks are the same size? Of course they're not.

40 cubic ft tank is 7"x17.5"
20 cubic ft tank is 5.25"x13.75"


EDIT: Actually, ignore me - I just re-read your question haha. They are a reputable seller though, so nothing to worry about imo, but yes of course you will need a regulator

Just some random question:
Since the volume of two types of tanks are different, 40 cf of nitrogen would be stored at a different pressure from the pressure that a 20 cf of nitrogen would be stored at? Is that reasoning, correct?

7"x17.5" is different from 5.25"x13.75" so they are different size volumes. That is, the two types of tanks are different in terms of volume.

If two types of tanks were to be of the same volume, then 40 cf of nitrogen would be stored at a pressure twice the pressure that a 20 cf of nitrogen would be stored.. Is this line of reasoning, correct?

Any response would be appreciated..

 

[Lookingforabus]

Below is an explanation of how the volume of a compressed has is measured.

Volume of Compressed Gas in a Cylinder

Volume of Compressed Gas in a Cylinder

industry.airliquide.us

 

[how2toGetout]

Below is an explanation of how the volume of a compressed has is measured.

Volume of Compressed Gas in a Cylinder

Volume of Compressed Gas in a Cylinder

industry.airliquide.us

Thank you, Lookingforbus. The link is helpful. It's exactly the kind of concept i was looking for. The link talks about 'water volume' (or 'water capacity' as it is mentioned in other places) and i didn't know this concept all just can fall under the concept of "Ideal Gas Law".