CO2 Refill Weight?

Nick72

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What should I expect in terms of weight of CO2 when the LFS refills my CO2 Cylinders?

Here are my thoughts.

Example - I have a 3 Liter CO2 cylinder with an empty weight of 2.3kg.

3 Liters of CO2 should weigh 3.042 KG according to this chart: http://www.airproducts.com/Products...ht-and-volume-equivalents/carbon-dioxide.aspx

Let's call it 3Kg.

The safety limit on a CO2 cylinder is 68%.

Therefore my fully refilled cylinder should weight 2.3Kg (empty weight) + ((3Kg x 0.68) = 2.048Kg), so total full weight = empty weight 2.3Kg + CO2 weight 2Kg =4.3Kg

I ask this because the last 3 times I came home with a refill of this 3 liter cylinder it weighed 4.240kg, 4.120kg and 3.870kg.


Is there anything I'm missing around specific weight or density / temperature or pressure?

(correction my cylinder weighs 2.3Kg empty - updated above)
 
Last edited:

jaypeecee

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Hi @Nick72

In the UK, the 'norm' seems to be to stick with weights only, not volumes. So, it couldn't be simpler. If I buy a 500g 'cylinder', I am buying 500g of liquified CO2. Volume never enters into it. I haven't needed to buy CO2 for many months but that's what I remember and I can't see why anything should have changed.

JPC
 

Nick72

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Hi @Nick72

In the UK, the 'norm' seems to be to stick with weights only, not volumes. So, it couldn't be simpler. If I buy a 500g 'cylinder', I am buying 500g of liquified CO2. Volume never enters into it. I haven't needed to buy CO2 for many months but that's what I remember and I can't see why anything should have changed.

JPC

Hi JPC,

Do you refill your 500g cylinders?

Is 500g the cylinder volume or the amount the cylinder can hold after 68% safety factor?

Have you ever weighed your cylinder both empty then full?
 

jaypeecee

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Hi JPC,

Do you refill your 500g cylinders?

Is 500g the cylinder volume or the amount the cylinder can hold after 68% safety factor?

Have you ever weighed your cylinder both empty then full?

Hi @Nick72

Yes, my 500g cylinder is refillable.

I have never needed to consider 'safety factor' - that's probably relevant to whoever refills my cylinders. I'd provide a link to the JBL web site showing my cylinder but it would only confuse as it shows a collection of cylinders!

Yes, I always weighed my cylinder - both empty and full. I don't have my notes handy but, going from memory, my 500g cylinder was 2.3kg empty and 2.8kg when full.

Hope that helps.

JPC
 

Nick72

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Hi @Nick72

Yes, my 500g cylinder is refillable.

I have never needed to consider 'safety factor' - that's probably relevant to whoever refills my cylinders. I'd provide a link to the JBL web site showing my cylinder but it would only confuse as it shows a collection of cylinders!

Yes, I always weighed my cylinder - both empty and full. I don't have my notes handy but, going from memory, my 500g cylinder was 2.3kg empty and 2.8kg when full.

Hope that helps.

JPC


Going off thread a little here, but I'm suprised your 500g cylinder weighs 2.3kg empty.

That's the same empty weight as my 3 liter (3Kg) cylinder.

023CFA0A-E8C4-45D4-990A-310EA0BB9112.jpeg
 

jaypeecee

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Hi @Nick72

I've just dug out my CO2 cylinder. It's a JBL Pro Flora m500 and it weighs 2.3kg empty. The cylinder is made from a magnetic material as magnets stick to it. I would guess that it's steel. I have now found a suitable link:

https://www.jbl.de/en/products/detail/7372/jbl-proflora-m500-silver

You would appear to have an ISTA cylinder. This one, perhaps:

http://www.istaproducts.com/product/co2-aluminum-cylinder-3l/

The ISTA cylinder is made from aluminium/aluminum, which is obviously going to be a lot lighter than steel.

JPC
 

Nick72

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Hi @Nick72

I've just dug out my CO2 cylinder. It's a JBL Pro Flora m500 and it weighs 2.3kg empty. The cylinder is made from a magnetic material as magnets stick to it. I would guess that it's steel. I have now found a suitable link:

https://www.jbl.de/en/products/detail/7372/jbl-proflora-m500-silver

You would appear to have an ISTA cylinder. This one, perhaps:

http://www.istaproducts.com/product/co2-aluminum-cylinder-3l/

The ISTA cylinder is made from aluminium/aluminum, which is obviously going to be a lot lighter than steel.

JPC

I did wonder if it might be steel knowing that mine is aluminum and lighter than steel. Still surprises me that a 500g capacity steel cylinder weighs as much as a 3Kg capacity aluminum one.

The wondrous weight saving of ali then.
 

jaypeecee

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I did wonder if it might be steel knowing that mine is aluminum and lighter than steel. Still surprises me that a 500g capacity steel cylinder weighs as much as a 3Kg capacity aluminum one.

Hi @Nick72

Steel would appear to be approximately three times denser than aluminium/aluminum. But, then, there's the cylinder wall thickness to take into account and we don't know that. Nor do we need to. The figures speak for themselves.

JPC
 

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