The copper pipe as a gas pipe

Copper pipes are widely used for transporting a wide variety of media. One of them is gas. You will find out what should be considered as a gas pipe for copper pipes in the following guide.

The use of copper pipes

Copper pipes can not be used arbitrarily in their dimensions, nor after any installation. Copper pipes can be soldered, welded and glued. When soldering, you can distinguish between hard and soft soldering of copper pipes. Here, the brazing of copper pipes can be further divided into high temperature brazing (HTL).

Fields of application for copper pipes

So there are different connection techniques to choose from. In addition, copper is extremely resistant to many substances (and depends on the correct installation and maintenance). This results in a wide range of uses for copper pipes:

  • Water pipes (heating, service water, drinking water, sewage, rainwater, etc.)
  • Oil pipes (hydraulic)
  • Air pipes (pneumatic)
  • Gas pipes (refrigeration, energy supply)

Regardless of the use for which copper pipes are now used, the strict regulations of the DVGW (German Association of the Gas and Water Industry) apply. Which are also reflected in the DIN and DIN EN standards.

Regulations for copper pipes as gas pipes

Thus, the dimensions of the copper pipes are already prescribed not only for water pipes but also for gas pipes. Attention: In 2010, these dimensions were adjusted in the course of EU harmonization. Since 2013, the new regulations GW 392: 2009 have also been implemented by the manufacturers of copper pipes.

In addition, specific regulations for the passage through ceilings and walls or / and combustible materials apply. In particular, the fire protection rules and instructions on the escape routes are to be observed.

In general, the regulations of DIN EN 1057 for drinking water and gas pipelines apply, as well as DVGW Code of Practice GW 392. In addition, there are the test requirements according to RAL (RAL RG 641). Permitted or approved pipes for the gas line are equipped with the appropriate CE mark. In addition, various regulations apply specifically to gas pipelines: TRGI (DVGW G 600) for natural gas, TRF for LPG.

The regulations for installation and installation of copper pipes

fittings

For the installation according to DIN EN 1057 there are different fittings in addition to the conventional soldering and welding techniques. These include soldering (Kapillarlötfittings) and press fittings whose releases are also to be observed. Especially with copper pipes to be soldered, the capillary effect must be taken into account. Especially for water and gas pipes very tight tolerances apply. Thus, the calibration of the copper tubes is extremely important.

flange

The following rules apply to flange connections:

Natural gas / TRGI
  • Fittings conical-spherical, flat sealing: without restrictions
  • Compression fittings met. sealing: exclusively with DVGW approval mark
  • Compression fittings, soft sealing: exclusively with DVGW approval mark
  • Pipe couplings according to DIN 3387-1: exclusively DGW registered
  • Flanges: only flanges made of gunmetal (bronze alloy)

Permitted joining techniques for copper pipes

For copper pipes, there are various joining techniques that may be used depending on the application. That would be:

  • soldering
  • brazing
  • welding
  • Press
  • jam
  • stick

Permitted joining techniques Copper pipe as gas pipe

For gas lines, the following connections may be used:

Natural gas:
  • Brazing (without restrictions)
  • Welding (without restrictions)
  • Pressing (without restrictions)
  • Clamps (less than or equal to 28 mm)
LPG:
  • Brazing (less than or equal to 35 mm)
  • Welding (without restrictions)
  • Pressing (without restrictions)

Thus, there are very precise rules, if you want to use copper pipes as a gas line. These are to be strictly adhered to. In addition, the RAL tests must be taken into account.

Tips & Tricks

The brazing alloys which may be used for brazing are of course also regulated. The relevant information can be found in DIN EN ISO 17672 (DIN 8513). Associated fluxes can be found in DIN EN 1045. The welding consumables are regulated in DIN EN ISO 24373. In addition, the DVGW worksheets must be taken into account when bending the copper pipes.

Video Board: Flare copper tubing with flaring clamp for gas fitting, plumbing connection