Fast, leak-proof connections into existing steel pipe installations

CONNECTIONS into steel pipework systems are still welded in many heating and cooling systems and industrial applications. This is not only time-consuming and laborious, but there is also the risk of fire due to an open flame or sparks, especially in confined or hazardous environments. With Viega Megapress technology, thick-walled steel pipes in nominal diameters of 15mm (½”) to 50mm (2”) can now be pressed within seconds. The company claim assembly time is reduced by up to 60 per cent compared with welding procedures.

Pipe connections in building services such as heating & amp; air conditioning, sprinklers and fire protection and compressed air and gas delivery no longer need to be soldered, screwed or welded. Instead, they are “cold” pressed – a much more economical methodology due to the faster processing time, as well as being more secure as there is no requirement for open flame. For thick-walled steel pipes in accordance with SANS 62 medium and heavy and ASTM Schedule 40, these processing advantages could not be exploited up to now as the external diameter of the pipes exhibit considerable dimensional tolerances.

Viega has now developed a practical solution with the “Megapress” system. A special profile-sealing element made of EPDM is now integrated into steel connectors made from material 1.0308 (St 37) with a zinc-nickel coating. In combination with a cutting ring, this ensures a durable, impermeable and friction-locked connection on the rough surface of black, galvanised, painted or epoxy resin-coated steel pipes.

Time saving of up to 60 per cent

The time saving of the new press connection technology for steel pipes is considerable. Depending on the external nominal bore (15 (1/2”mm – 50mm( 2”)), this can be up to 60 per cent in comparison with conventional connecting processes such as welding, clamping or screwing.

In addition “Megapress connectors offer security against forced leakage in an unpressed state due to the SC- Contour. Inadvertently unpressed connections become visible during the leakage test and can be pressed even under pressure, making the connections permanently sealed.

Press effortlessly

Working with the “Megapress” system is not just more secure for the fitter or technician but also does not require the same skills or effort as welding. Typical steel pipe installations for compressed air, industrial gases, fire extinguishing and sprinkler systems are often several metres high, positioned below ceiling slabs or roof trusses.

Welding in inaccessible positions requires effort and can be dangerous. With Viega pressing tools, the connection can be pressed effortlessly above the fitter’s head. Viega supplies the accessories in a practical case, which includes three press jaws (12mm – 25mm), three press rings for nominal diameters of 32mm – 50mm and hinged press jaws. This makes it possible to carry out press connections in restricted spaces.

The press system is suitable for heating and cooling systems and for industrial applications up to 1 600kPa and temperatures up to 110°C.

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