Use is possible in the following areas among others:

• Gas installations, see Regulations from section: Application areas

• Liquid gas installations, also see Regulations from section: Application areas .

• Compressed air systems

For planning, execution, modification and operation of gas installations, observe the applicable regulations, see Regulations from section: Application areas .

Use is possible in the gas installations described below:

• Gas installations

  • Low pressure range ≤ 100 hPa (100 mbar)

  • Medium pressure range from 100 hPa (100 mbar) up to 0.1 MPa (1 bar)

  • Industrial, commercial and technical processing systems with the corresponding directives and technical regulations up to 0.5 MPa (5 bar)

• Liquid gas installations

  • With liquid gas tank in medium pressure range downstream of the pressure regulating valve, 1st level on the liquid gas tank > 100 hPa (100 mbar) up to a permitted operating pressure of 0.5 MPa (5 bar)

  • With liquid gas tank in the low pressure range ≤ 100 hPa (100 mbar) behind the pressure regulating valve, 2nd level

  • With liquid gas pressurised container (liquid gas bottles) < 16 kg

    Behind the small bottle pressure regulating valve

  • With liquid gas tank (liquid gas bottle) ≥ 16 kg

    Behind the large bottle pressure regulating device

The system is suitable for the following media, amongst others:

For the applicable directives, see Regulations from section: Media .

• Gases

• Liquid gases, only in the gaseous state for domestic and commercial applications

• Compressed air

The piping system consists of press connectors for copper pipes and the corresponding press tools.

The system components are available in the following dimension: d 64.

Profipress G XL press connectors are tested and certified with the following copper pipes, see Regulations from section: Pipes :

Thinner walls than stated are not permitted.

Observe the general rules of fixing technology:

• For gas installations, see Standards and regulations .

• Only fix on components with sufficient stability.

• Gas supply lines must not be secured to other pipelines nor should they be used as support for other pipelines.

• The system can be secured using commercially available plastic dowels together with non-​flammable pipe clamps (e.g. metallic pipe clamps).

With gas supply lines, observe the following fixing intervals for pipelines laid horizontally:

On Profipress G XL press connectors, there is a cutting ring, a separator ring and a sealing element in the bead of the press connector. The cutting ring cuts into the pipe during pressing and ensures a force-​fit connection.

During installation, and later during the pressing, the separator ring protects the sealing element from damage from the cutting ring.

Viega press connectors are equipped with the SC‑Contur. The SC‑Contur is a safety technology that is certified by the DVGW and ensures that the press connector is guaranteed to be leaky in an unpressed state. In this way, inadvertently unpressed connections are noticed during a leakage test.

Viega guarantees that unpressed connections become visible during a leakage test:

• with dry leakage test in the pressure range from 22 hPa–0.3 MPa (22 mbar–3.0 bar)

The press connectors are marked as follows:

• Yellow rectangle for gas

• Gas for gas supply lines

• MOP5 for maximum operating pressure 0.5 MPa (5 bar)

• GT1 for operating pressure with HTR requirement 0.1 MPa (1 bar)

• DVGW

Depending on the area of use, corrosion protection measures may have to be taken into account. One differentiates between external pipelines (underground and overground external pipelines), as well as internal pipelines.

Information about the area of use, also see Areas of application .

The pertinent guidelines must be observed for corrosion protection, see Regulations from section: Corrosion .

Overground pipes and fittings in rooms do not normally require external corrosion protection.

There are exceptions in the following cases:

• There is contact with aggressive building materials such as materials containing nitrite or ammonium.

• in aggressive surroundings

• In recesses within bare floors or in the compensating layer, they must be treated in the same way as buried external pipelines, see Regulations from section: Corrosion .

System components may, in some cases, have become damaged through transportation and storage.

• Check all parts.

• Replace damaged components.

• Do not repair damaged components.

• Contaminated components may not be installed.

The system is intended for underground device connection pipelines for gas devices for use outside. Press connectors are not permitted in underground liquid gas pipelines.

For gas installations, observe the applicable regulations, see Regulations from section: Notes on mounting .

The following conditions amongst others are valid when laying gas supply lines:

• Lay gas supply lines with clearance from the installation body, concealed without hollow spaces, or in ventilated ducts or shafts.

• Do not install gas supply lines with operating pressures > 100 hPa (100 mbar) concealed in the wall.

• Arrange gas supply lines in such a way that condense water or water dripping from other pipes and components does not affect them.

• Do not lay gas supply lines in screed.

• Shut-​off systems and detachable connections must be easily accessible.

Requirements on concealed installations:

• Lay stress-​free.

• Apply corrosion protection.

• Do not use any detachable connections (screw fittings).

• Do not use copper pipes together with materials containing nitrite or ammonium.

For the Z dimensions, refer to the respective product page in the online catalogue.

The following tools are required for production of a press connection:

• Pipe cutter or a fine-​toothed hacksaw

• Deburrer and coloured pen for marking

• press machine with constant pressing force of 32 kN

• Press ring with corresponding hinged adapter jaw, suitable for the pipe diameter and with suitable profile

For information about tools, also see Required tools .

The pipe ends must be thoroughly deburred internally and externally after shortening.

Deburring prevents the sealing element being damaged or the that the press connector cants when mounted. Viega recommends using a deburrer (model 2292.4XL).

Requirements:

• The pipe end is not bent or damaged.

• The pipe is deburred.

• The correct sealing element is in the press connector.

  HNBR = yellow

• Sealing element, separator ring and cutting ring are undamaged.

• The complete sealing element, separator ring and cutting ring are in the bead.

In the press connector system shown, flange connections in size 64.0 mm are possible.

The assembly of flange connections may only be carried out by qualified personnel. Personnel can be qualified to assemble flange connections on the basis of applicable directives, for example; see Regulations from section: Establishing a flange connection .

• A corresponding training section on proper flange connection assembly in vocational training (of staff/specialist personnel) with qualified completion as well as successful regular application are considered as sufficient proof.

• Other employees without the appropriate technical training (e.g. operating personnel) who are to install flange connections must be provided with technical knowledge through training measures (theoretical and practical); this must be documented.

The advantages of using hardened washers are:

• Defined friction surface during assembly.

• Defined roughness in calculation and thus reduction of the scattering of the tightening torque, whereby a greater screw force can be achieved mathematically.

loose flange

• Steel, black, powder-​coated

• Copper press connection

• Model 2659.5XL: 64 mm

The correct assembly of flange connections requires parallel aligned flange blades without an offset centre that allow the sealing element to be inserted in the correct position without damage.

The gap (out-​of-​parallelism of the sealing surfaces) before tightening the screws is not critical if the permissible gap is not exceeded.

• The order in which the screws and nuts are tightened has a significant influence on the force distribution acting on the seal (surface pressure). Incorrect tightening leads to a high dispersion of the pretensioning forces and can result in the required minimum surface pressure not being reached and even in leaks.

• After tightening the nut, at least two but no more than five threads should protrude from the end of the screw.

Before starting to disassemble an existing flange connection, get approval and a work permit from the responsible company, if necessary, observing the following:

• The system section must be depressurised and completely flushed.

• Secure built-​in or attached parts that are not held separately before loosening the flange connection. This also applies to fastening systems such as spring hangers and supports.

• Start loosening screws or nuts on the side facing away from the body, loosen the remaining bolts slightly and only disassemble completely when you have ensured that the piping system does not present a risk. If a pipeline is under tension, there is a risk of the pipeline rupturing.

• Loosen the screws or nuts crosswise in at least two passes.

• Close open ends of strands with dummy plugs.

• Transport disassembled pipelines only in closed condition.

• When replacing seals, make sure to remove the old seal completely from the flange sealing surface without damaging the flange sealing surface.

The installer must perform a leakage test before commissioning.

Carry out this test on a system that is finished but not covered.

Observe the applicable regulations, see Regulations from section: Leakage test .

Document the result.