Connecting a copper pipe

Copper pipes are among the most frequently used pipes due to their versatile positive properties. Of course, in line with this diversity, there are also different methods and techniques for connecting copper pipes. What connection techniques that would be and what else should be considered when connecting a copper pipe, we have summarized in this guide.

Copper tubes are found in different areas

Copper is a metal that is compatible with almost all important transport media. Therefore, it is used in industry and trade as well as in building services and for other applications in the private sector. Here are some of the most important uses and transport media:

  • Copper pipes as water pipes (drinking water, sewage, rainwater, heating water)
  • Copper pipes as gas pipes (natural gas, liquefied gases such as propane gas)
  • Copper pipes as hydraulic pipes (oil pipes for hydraulic applications)
  • Copper pipes as pneumatic pipes (compressed air)
  • Copper pipes in refrigeration (refrigerant gases mixed with compressor oils in air conditioning systems, refrigerators)
  • Copper pipes in the food industry (milk, beverages, etc.)

Joining techniques for copper pipes

All these applications have one thing in common: the copper pipes must be tight after being joined permanently and depending on the transported medium also absolutely safe. Therefore, the connection techniques can not be arbitrarily selected. First, however, connection options that are taken for granted today for copper pipes:

  • Brazing (450 to 1,200 degrees Celsius)
  • Soft soldering (from a good 100 to a maximum of 450 degrees)
  • HTL brazing, high-temperature brazing (from 900 degrees)
  • Welding
  • Pressing
  • Pressing and brazing
  • Gluing
  • Screwing and clamping

Connecting copper pipes according to temperature aspects

The core data already show that the different joining techniques are not suitable for every area. When soldering copper pipes partially pure tin solder must be used. These have a melting point that is about 30 to 40 degrees higher than that of tin-lead solders. These in turn have melting points from about 138 degrees (Sn42Bi58). In Wood's metal, the melting point is even only 75 degrees.

The flow temperature of heating water can be up to 90 degrees. In refrigeration it gets even heavier. Cold is generated by compressing and liquefying the refrigerant gas via a compressor. At first, heat is released, the pipes become so hot that you can burn yourself. As a result, for example, the soldering can not be applied everywhere.

Working pressure in copper pipes and connections to other materials

In addition to temperature, working pressures in the copper pipes also play an important role. Again, not every connection technique is equally well suited. You can also connect copper pipes with other materials. This diversity has led to extensive regulations and regulations in Europe and, of course, Germany, which specify how copper pipes can be connected.

Guidebooks and instructions for different joining techniques

Therefore, you will find in our house journals corresponding guides for all common joining techniques of copper pipes. For example, about the brazing of copper pipes, but also stick to the copper pipe.

Tips & Tricks Please note that as a do-it-yourselfer, you are not allowed to perform any connection of copper pipes. For quick couplings, which are made to connect two lines, such connected lines may no longer be solved by the non-specialist. An example would be quick disconnect couplings of split air conditioners.
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