Use is possible in the following areas among others:

• Potable water installations

• Industrial and heating systems

• Wet sprinkler systems with dimensions DN25–50 with hard-​drawn copper pipe, see Regulations from section: Application areas

• Fire extinguishing systems, see Regulations from section: Application areas

  • Wet

• Solar installations with flat collectors

• Solar installations with vacuum collectors (at least 2 metres away from the vacuum collector)

• Compressed air systems

• Cooling water pipelines (closed circuit)

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

Inform your customer or the operator of the potable water installation that the system has to be maintained on a regular basis, see Regulations from section: Application areas .

Only EPDM sealing elements are approved in potable water installations. Do not use any other sealing elements.

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

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

• Potable water relating to the pipe material, except the components (press connectors, fittings, devices, etc.):

  • At pH-​values ≥ 7.4

  • At pH values between 7.0 and 7.4 and a TOC value ≤ 1.5 mg/l

• Heating water for pump hot water heating systems

• Recycled water

• Compressed air in compliance with the specification of the sealing elements used

  • EPDM at oil concentration < 25 mg/m³

• Anti-​freeze, cooling brines up to a concentration of 50 %

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

The system components are available in the following dimensions: DN 15 / 18 / 20 / 25 / 32 / 40 / 50.

Only copper pipes that comply with the pertinent regulations may be used, see Regulations from section: Pipes :

Various wall thicknesses are permitted depending on the area of use (potable water or heating installation).

Only pipe clamps with noise insulation inlays should be used.

Observe the general rules of fixing technology:

• Fixed pipelines should not be used as support for other pipelines and components.

• Do not use pipe hooks.

• Observe distance to press connectors.

• Observe the expansion direction – plan fixed and gliding points.

Affix the pipelines in such a way as to de-​couple them from the installation body, so that they cannot transfer any structure-​borne sound, resulting from thermal expansion or possible pressure surges, onto the installation body or other components.

Observe the following fixing distances:

Pipelines expand with heat. Heat expansion is dependent on the material. Changes in length lead to tension within the installation. These tensions must be compensated for with suitable measures.

The following are effective:

• Fixed and gliding points

• Expansion equalisation joints (expansion bends)

• Compensators

The length expansion Δl can be taken from the diagram or can be calculated using the following formula:

Δl = ⍺ [mm/mK]× L [m]xΔ ϑ [K]

The press connectors in the Propress system consist of the following materials:

• Copper

• Silicon bronze

The press connectors have a circumferential bead in which the sealing element lies. The press connector is deformed upstream and downstream of the bead and permanently connected to the pipe during pressing. The sealing element is not deformed during pressing.

Viega press connectors are equipped with the Smart Connect Feature (SC‑Contur). The Smart Connect Feature (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 immediately when filling the system.

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

• in the case of the wet leakage test, in the pressure range from 100–650 kPa (1.0–6.5 bar)

• in the case of the dry leakage test, in the pressure range from 2.2–300 kPa (22 mbar–3.0 bar)

The sealing element is pre-​lubricated and must not be removed from the press connector. In the event that lubrication is required, use only clean water.

The press connectors are marked with a coloured dot. The dot identifies the Smart Connect Feature (SC‑Contur) where the test medium would escape in the case of an inadvertently unpressed connection.

The green dot indicates that the system is suitable for potable water and is equipped with the Smart Connect Feature (SC‑Contur).

In potable water installations, piping components from different metals can have a detrimental effect on each other and cause corrosion, for example. For instance, a copper pipe must not be installed directly upstream of a galvanised steel pipe.

Please contact Viega for questions on this subject.

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

There are exceptions in the following cases:

• Contact with aggressive building materials such as nitrite or materials containing ammonium

• in aggressive surroundings

If external corrosion protection is required, observe the pertinent guidelines, 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 pressing of a fitting can cause a deflection. When pressing Viega Propress press connectors, the press connector is permanently deformed. This enables a consistently tight connection.

The deflection occurs in the same way with every press connector. During pressing, the press connector moves in the direction of the press jaw or ring opening.

• As the press connector bends in the direction of the press jaw or ring opening, the pipe end bends in the opposite direction.

• The bending of the press connector and pipe can be reduced by preventing the movement of the press connector.

• The use of struts and clamps reduces the deflection and the deflection is virtually eliminated by evenly spacing out the clamps.

The following steps can reduce the deflection during pressing.

Site conditions permitting:

Overhead piping can make it difficult to press from opposite sides of the press connector.

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

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

Copper pipes in the sizes d 15, 18 and 28 can be bent cold with commercially available bending equipment (radius at least 3.5 x d).

The pipe ends (a) must be at least 50 mm long so that the press connectors can be mounted properly.

For information about tools, also see Required tools .

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

The pipe ends must be thoroughly deburred internally and externally after shortening. Deburring prevents the sealing element becoming damaged and ensures the press connector can be mounted. Viega recommends using a deburrer (model 2292.2).

Requirements:

• The pipe end is not bent or damaged.

• The pipe is deburred.

• The correct sealing element is in the press connector.

  EPDM = polished black

• The sealing element is undamaged.

• The complete sealing element is in the bead.

Viega pressure test plugs for leakage tests and temporary plugging of pipeline sections must only be used for:

• Supervised leakage test and load tests of pipelines with water up to max. 1.6 MPa (1600 kPa, 16 bar).

• Supervised leakage test of pipelines with oil-​free compressed air or inert gases (nitrogen) up to max. 150 hPa (15 kPa, 150 mbar), and load tests up to max. 0.3 MPa (300 kPa, 3 bar).

The pressure test plug (model 2269) must not be used in gas installations. Any use beyond the specified application is considered non-​intended use. Viega assumes no liability for damage caused by non-​intended use.

Observe the applicable national regulations for leakage and load tests, see Regulations from section: Mounting the forcing plug .

The installer must perform a leakage test before commissioning.

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

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

The leakage test pursuant to the applicable regulations must also be carried out for non-​potable water installations, see Regulations from section: Leakage test .

Document the result.