The first proven use of clay as a working material dates back to 2000 BC; the first communal sewage system was built in what is now Poland in 1531. In Europe, vitrified clay pipes have been used for waste water transportation on a large scale for over 100 years – and with great success. Their strength and stability result in savings even before installation due to a reduced bedding requirement. Once installed, the pipes keep their form which means they maintain their optimal hydraulic characteristics– even under several tonnes of load. They even have a higher mechanical stability than reinforced concrete.

 

Vitrified clay pipes are highly resistant to bending, non-corrosive and immune to wear and tear. Consequently, waste water will not be dammed up and there will be no occurrence of leakages endangering the surrounding soil.

VITRIFIED CLAY – THE MATERIAL

FOREVER DOWN-TO-EARTH

Tighter than any other Pipe

Modern vitrified clay pipes can withstand pipe jetting up to 340 bar, are temperature-proof and are resistant to all types of chemical influence. Today’s vitrified clay pipes have sophisticated, tightly fixed sealing systems, which like the vitrified clay pipes themselves, are extremely stable and resistant to aggressive effluent from households and industry. The combination of rigid, corrosion-resistant vitrified clay pipes and flexible pipe joints ensures that pipes remain fully leak proof, even under the toughest conditions.

 

Vitrified clay pipes are resistant to chemical, biological and mechanical stresses, making them the perfect solution for high material loads – for example where pipe gradients are low and the flushing effect unsatisfactory.

Stability – a matter of the right mixture

Even under the highest strains, modern vitrified clay pipes deform by less than 4 % thanks to material strength and stability. This intrinsic load-bearing capacity, in tandem with flexible pipe connections, ensures that vitrified clay pipes retain their essential mechanical properties over many decades, facilitating access for inspection and maintenance work.

Installation in a jiffy

Normally, vitrified clay pipes can be bedded on as-dug material. The precise compaction requirements associated with the bedding of flexible materials are not required here thanks to the high material density and stability of vitrified clay. Even on installation, the contractor can rely on the strength and durability of vitrified clay to save valuable time and costs.

Vitrified clay – the safe solution

  • Dimensional stability: Whilst the general standard EN 295 only envisages 2 million load cycles, modern vitrified clay pipes can withstand up to 20 million load cycles without damage or deformation occurring.
  • Tightness: vitrified clay pipes are water-tight in compliance with the European standard EN 295 at an internal and external water pressure of 0.5 bar. They also remain leak-proof at the same pressure under heavy loads (shear force stress and radial load).
  • Degree of hardness: vitrified clay is almost as hard as quartz and has a stable, homogenous structure. This results in a high resistance to erosion.
  • Hydraulic smoothness: the especially smooth, hard surface of vitrified clay pipes simultaneously ensures minimum abrasion and an optimum flushing effect.
  • Resistance to pipe jetting: vitrified clay pipe systems can withstand jetting pressures of up to 340 bar. Pipe jetting is generally carried out well below 280 bar.
  • Fire and temperature resistance: vitrified clay pipes are non-flammable and especially resistant to heat and cold. They can withstand high temperatures and low temperatures far below freezing point for short periods.
  • Stray current resistance: ceramic is particularly effective at insulating. Vitrified clay pipes are therefore ideal protection against stray currents and hence material corrosion.
  • Root resistance: the seals in vitrified clay pipes guarantee up to 100 years of tightness, at root pressures specified in the standard EN 295.