Due to the thermoplastic material the pipes can be welded together which signifies, that the whole pipeline creates a homogenous system and is absolutely safe against infiltrations and exfiltrations.
Good chemical resistance
For buried pipelines the biogenous sulphuric acid corrosion plays a key role regarding the longevity of the system. The biogenous sulphuric acid corrosion only takes place above the water level and therefore only occurs in partly filled pipes. Thanks to the used material Krah pipeline systems guarantee optimum security and resistance.
Impact resistance
The high impact resistance, even at low temperatures, ensures a robust pipe, resistant against impacts during transport, installation on the site and during the whole service life conditions.
Resistance to microorganisms, rodents and termites
The smooth round surface of plastic pipes does not give the teeth of rodents sufficient hold to cause damage. Moreover even in termite-affected countries no damage to polyethylene pipelines by termites has ever been occurred. Polyethylene and polypropylene are not a nutrient medium for bacteria, fungi and spores, so that the material is resistant to all forms of microbial attack as well as to both sulphurous acid and sulfates.
Inner diameter and hydraulic properties of Krah pipes will remain constant regardless of the wall thickness or the profiles due to the smooth anti adhesive inner pipe surface. The nominal diameter (e.g. DN/ID 500) corresponds to the respective inner diameter according to DIN 16961. Compared to other pipe materials like concrete, smaller diameters can be used, which means that costs for material and installation can be reduced considerably.
Abrasion resistance
PE and PP pipes are among the most abrasion proof pipes.
Black polyethylene pipes are permanently resistant to atmospheric corrosion and UV radiation. Thus the pipes can be used and stored outside without the pipe material being damaged. No aging effect will occur.
Specific light weight
The Krah pipes have a very low weight and therefore are easy to handle during installation, which makes the usage of a crane on site in most of the cases unnecessary.
Deformation resistance
Pipes made of Polyethylene and Polypropylene has considerable advantages to other pipe materials like concrete, steel, ductile etc. Due to their material the Krah pipes posses over a high elongation at break. This signifies that the pipe can support even loads or deformations that were not included in the actual calculation and design of the pipe, like for examples earthquakes. The Krah pipes deform conform to the movement of the earth without any breaks or cracks, so that the activity of the pipeline is not drastically affected. As soon as the overload and earth movement ends, the pipe will go back to its initial condition and position.
Elastic pipes can react to changes in their environment. Due to the deformation performance, the load is distributed to its surrounding and the force acting on the pipe will be diminished. Within a short time there is a balance in the area around the pipeline and the deformation comes to a standstill. Plastic pipes react very flexible to static loads, while the loads do not concentrate themselves on the pipe, but are diverted to the surrounding soil. Flexible pipes still function, when other rigid pipe systems have already broken. Even in the case of a deformation the system is still absolute resistant against infiltration and exfiltration. Since the pipes are profiled on the outside, these profiles can fix the pipes in the soil. There will be no or very few axial extensions in the pipeline. Krah pipes are nearly unaffected by temperature variations.