Disclosure: This website contains affiliate links, meaning when you click the links and make a purchase, we receive a small comission with no additional costs to you.

How to Refill a CO2 Tank with an Air Compressor?

You are the proud new owner of a CO2 tank, but there’s a small issue: how do you refill it? Do you need to follow any exact steps? Can you do it yourself? Do you need to take it into a shop in order to have it refilled? Well, if you don’t have an air compressor, you might need to. However, if you do, you can do it all by yourself if that’s what you wish.

Steps for Filling a CO2 Tank

How to Refill a CO2 Tank with an Air CompressorYou have a CO2 tank, and you have your quiet air compressor as well – you don’t want to bother the neighbors, after all. So, where do you start? Do you have to take any preparatory steps? Well, to make the task easier for you, here is a step-by-step guide on how you must do the refilling.

1. Check Its Integrity

Every tank should feature a date stating the last time it had a hydro-testing. In most circumstances, U.S. requirements state that a tank must get testing once every five years.

There are also small tanks that might not need further testing after their first one. You can see whether it needs testing or not by checking the date on the cylinder or asking the one conducting the test.

The date should look something like this: 07C19. The first two letters will signify the month when you last got the test, and the last two tell you the year. The letter (or letters) in the middle will tell you which agency gave you the approval for the inspection. If it all looks good and the tank falls in that five-year span, then you can safely use it. If not, then you need to take it for an inspection of its integrity.

2. Know the PSI Rating of the Tank

When you are refilling a CO2 tank, you need to make sure that you know and respect its PSI rating. You can either find it on the tank or in the product description. In this respect, you should never attempt to fill a tank more than it can hold. In fact, under-filling the tank is much safer in comparison to overfilling it.

That being said, if the CO2 tank is 100% oil-free and dry, then you may fill it to the capacity that it has been rated at. However, if you aren’t completely certain that it’s oil-free and dry, then you may want to under-fill just to be safe.

3. Use the Correct Fill Adapter

Every compressed air tank and CO2 tank will come with different fittings so that you don’t use the wrong gas type by mistake. In this case, you will need the correct adapter that can connect your air compressor with the CO2 tank. Make sure that you get an adapter featuring the complete seal. Otherwise, you won’t be able to get anything done.

4. Completely Empty the CO2 Tank

Before you even think of adding anything more in your CO2 tank, you need to make sure that you’ve emptied it as well. Once you have attached the adaptor, hook the hose fitting up – but do not connect the compressor. You should be able to see a valve where you may open the tank, allowing you to “bleed out” the remaining air. Once it is empty, you may close the valve and move on to the actual filling process.

5. Get an Air Compressor with High Pressure

If you wish to successfully fill a CO2 tank cartridge, then you need an air compressor featuring a high pressure. These cannot be filled with just a hand pump or tire pump, as those types of pumps go only to around 150 PSI. Here, you will likely need more.

At the same time, you must make sure that the PSI matches the tank rating. Some CO2 tanks go as high as 4500 PSI or more. So, you need to make sure that you don’t go overboard or under. It needs to be in accordance with what your tank can take.

Safety Points to Follow

Safety Points to FollowCO2 tanks are not your average house tools, and the air compressor is not your usual pump. Therefore, in order to ensure there aren’t any issues, here is some safety advice on how to refill (and how not to refill) a CO2 tank.

  • These tools should only be handled when you are fully conscious. Don’t try to refill it when you are very tired or under the influence.
  • Under no circumstances should you drop a CO2 tank. Always make sure that you handle both the tank and the air compressor carefully.
  • Make sure you don’t cause any punctures to the CO2 tank, as they can be very dangerous.
  • Be sure that all flammable materials are removed so that you don’t cause any explosions or fires.

Owning a quiet air compressor and a CO2 tank is more common than you might think, and you can certainly put air compressor in a tank by yourself, without requiring professional help. That doesn’t mean that you have a free pass to become careless.

When you are refilling a CO2 tank, you need to be very careful and ensure that everything is done right. If you are not careful and make a mistake, it might cause an explosion for the under-pressure CO2 tank. Not only may you injure yourself, but you may injure those around you as well. So, keep in mind to take all the preparatory steps to ensure that everything is done correctly.

Final Thoughts

As you can see, actually using the air compressor on a CO2 tank is not difficult. It’s the preparatory steps that make the procedure a bit complicated. Just make sure that you are very careful so that there aren’t any incidents.

About Jason Parker

Jason Parker learned that being a cyclist doesn’t only mean riding – he decided to build his own workshop for maintenance and fixing. Soon enough, he realized that there is no decent workshop without air tools (of various types). Through research, trial, and error, he decided to gather all his knowledge (so far) into these blogs and guides.

Leave a Comment