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Using Copper Pipe For Compressed Air

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Copper pipe is often thought of as an excellent choice for use with air compressors and can be found in many air compressor systems across workshops and industries. This article will provide you with all the relevant information on using copper pipes for compressed air.

Table of Contents

Copper Pipe for Compressed Air

Copper pipes have great corrosion resistance and are very lightweight which makes them a great choice for compressed air. Copper pipes are easy to cut, weld, and suspend, making their installation easier than it would be otherwise.

However, it can be expensive to install copper due to the time and skill required to properly install it. Copper pipes are used in many plumbing applications and so, many fittings are available and many people know how to install them.

The color and shininess also add an aesthetically pleasing look for compressed air systems. Water does not cause copper to lead to rusting or corrosion and so the air being delivered to the tools through copper pipes is clean and free of debris. Copper, however, tends to cost more than other materials for piping like plastics.

Visit our Guide: Best Compressed Air Pipeline Materials For Compressed Air Piping Systems for more information on the other types of materials available.


  • Corrosion-resistant
  • Lightweight
  • Easy to cut and weld


  • Requires skill and time to install
  • Expensive in comparison to plastics

What Type of Copper is Used for Compressed Air?

The answer to this question is simple, Type K. Type K copper pipe has the thickest wall of all the common types of copper. It is also typically used for water distribution, fire protection, oil, HVAC, and many more applications across the construction industry.

Type K copper pipe is available in either a rigid or flexible form and has the ability to be used with flared and compression fittings in your compressed air system. It is also possible to use a different type of copper pipe, like Type L for instance, as long as the pipe is adequately pressure-rated to suit the needs of your system.

Copper Pipe for Compressed Air Sizes

Copper pipe is available in sizes as small as 1/4″ and can reach anything up to around 8″, though of course, you would not want pipe this large for compressed air. Most compressed air users opt for 1/2″ or 3/4″ copper pipes for their compressed air systems. The size you need will typically depend on the length of your lines and the size of the tools at the end of the line.

What Tools Do I Need for Soldering Copper Piping?

The thing with copper piping, is you have to join the pipes together which can be very time-consuming. To help you get ready for a plumbing project which involves soldering copper pipe to join it, here is a list of tools you’ll need at the ready!


You need a torch capable of soldering the copper and this can be either propane or MAPP (methylacetylene-propadiene propane). Propane works just fine but it takes longer than MAPP. MAPP is usually more expensive but gets much hotter than propane so will heat the pipe faster. The choice is really up to you!


There are many types of solder available for use so make sure you buy a suitable one. Any sort of plumbing solder should be okay, but I would ensure you check that the solder is suitable for soldering copper plumbing pipes and safe for water.


Flux is an acid that makes the solder flow into pipe joints. Good flux is necessary to ensure that you have a good flow of air and do not end up with any leaks between joints. It’s possible to solder with most of the fluxes available at home improvement stores, but there are some you might prefer more than others. If you find a flux that works well for you, stick with it, as you may not find another flux equal to this one.


The striker is used to create a spark to start the torch with. Some torches may have auto strikers built-in so these would be unnecessary. It’s best to use a striker not an open flame to light a torch for safety reasons.

Copper Pipe Cutters

Copper pipe cutters are an easy way to cut copper pipes that are of unnecessary lengths to their correct lengths. These cutters leave a nice straight edge on the copper and help to minimize burrs on the cut edge.

Sand Cloth

The sand cloth allows you to make sure that the copper pipe and its fittings are clean, which is probably one of the most important things to do before beginning to solder copper pipe.

A good sandpaper cloth is necessary to clean the outside of the copper pipe. You should sand both ends of the pipe to about 1/2″ beyond the fittings.

Fitting Brush

Fitting brushes are important to clean the inside of the copper fittings, the wire bristles can prime the inside of the fitting to allow it to make good contact with the pipe.

Safety Items

It is also necessary to have the following on hand when soldering copper pipe so that nothing is able to catch fire:

  • Water: a spray bottle of water is a must. Wet down any area you will be soldering first and then use it as a backup if anything begins to smolder. Also, you should wet the area back down when finished soldering since the residual heat may still catch fire.
  • Fire extinguisher: always have a fire extinguisher handy when soldering copper pipes just in case something catches fire and you cannot put it out with just a spray bottle of water.
  • Fire cloth: a barrier that is fire retardant can be positioned behind whatever it is you are soldering so that the surrounding area does not catch fire.

You should be able to obtain all these tools individually with ease, and may even come across kits that include a few together or everything you need for the job!

For instance, this soldering kit below on Amazon provides you with a propane torch and a striker.

Additionally to that, this plumbing kit below readily available on Amazon provides you with wire solder, flux, sand cloth, and an application brush!

How to Solder Copper Pipe for Compressed Air

Here I will provide you with a couple of very useful YouTube demonstrations that will help you with the process of soldering copper pipe.

FAQs (Frequently Asked Questions)

What type of copper pipe is used for compressed air?

Type K copper pipe has the thickest walls and is the most suitable of all the types of copper pipe for use in compressed air. Type L may also be suitable.

Can type M copper pipe be used for compressed air?

Yes, type M can be used for compressed air but it is advised that type L or K are used as they’re thicker and more suited to this application.

What PSI can copper pipe hold?

While this depends and varies significantly on the type of copper pipe and it’s size, copper pipe can hold up to around 1000 PSI, and in some cases, even more!

Additional Reading:

If you have any questions regarding copper pipe for compressed air, please leave a comment below, with a photo if applicable, so that someone can help you!

By Aidan Weeks

A passionate Mechanical Engineer with endless enthusiasm for fluid power - building off the back of over 18 years of high quality contribution and discussion stimulated by Bill Wade here at About Air Compressors. With both practical and theoretical experience in pneumatics and hydraulics, I'm putting my knowledge to work - and working my grey-matter through my research, assistance and publishing work here at About Air Compressors. Feel free to reach out any time! P.S. A HUGE shout out to Doug who really offers such great value to all visitors to About Air Compressors - once again, feeling like I'm standing on the shoulders of GIANTS by getting to work alongside such a great community

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