Why choose Krah pipe?
Why choose Krah pipe?
Krah pressure pipe diameters may range from DN/ID 300 up to DN/ ID 5000 mm made either of homogenous polyethylene, polypropylene or a compound of polyethylene reinforced with fiber.
Sewer systems made of profiled Krah pipes have been used for more than 35 years in all areas of local and industrial drainage. Krah offers a modern sewer pipe program with manholes, fittings, and safe pipe joint systems for the planning of sewer treatment plants.
Krah pipe is ideal for drainage and degassing of landfill sites.
Polyethylene pipe demonstrates a distinctive advantage over other pipe materials in resistance to abrasive damage such as scuffing, scratching, marring, wearing down, or rubbing away.
Polyethylene provides superior resistance against a chemically aggressive environment such as aqueous solutions of salts, dilute acids and alkalis, especially when used in sewer applications.
KRAH pipes have integrated deflection zones and deform up to a point where the loads are minimized. When the load decreases, the KRAH pipe can reach its new lowest-stress shape due to its elasticity. This characteristic gives KRAH pipe a clear advantage over concrete pipelines, which are subject to cracks, fractures, collapses and socket mismatches attributed to settlements resulting in overstress of the pipe crown.
The smooth inner surface of Krah polyethylene pipes offers an extraordinary flow characteristic, resisting deposit buildup and preserving flow velocity.
For larger pipes, Krah has developed a quick jointing method wherein the whole pipeline becomes a homogenous system and is absolutely safe against wanted and unwanted in- and ex-filtrations. A welding wire is included in the socket and then heated with the help of a special welding device, joining the two pipe ends (socket and spigot) together.
Life expectancy of Krah Pipe is conservatively estimated to be in excess of 100 years, demonstrating long-term hydrostatic strength behavior under various thermal and environmental conditions.
The low weight of Krah Pipe relative to conventional pipe materials allows for easy (and less expensive) transport and faster installation of the pipe. Generally no heavy machinery is necessary for the installation and handling of Krah Pipe.
With the third generation of high-performance polyethylene, pipes can be manufactured for higher pressures and higher temperatures.
Special polymers are available for working temperatures up to 50° Celsius / 122° Fahrenheit.
Krah’s high-performance polyethylene is very ductile, allowing the pipe to flex, bend and absorb impact loads within a wide range of temperatures without damage to pipe integrity.
Black polyethylene pipes are permanently resistant against atmospheric corrosion and UV radiation.
Krah® high-density polyethylene pipes can be manufactured with the necessary rigidity, assigning different profiles depending on the different load conditions that the conduction will have to face along its route. IRAM 13414 Standard establishes that the annular rigidity of HDPE high-density polyethylene pipes must be at least SN2. When this rigidity is not sufficient, the profile must be designed according to the requirements of the work or project, the minimum data necessary to size it are:
- Type of conduction
- Minimum and maximum cover
- Type of traffic
- Type of natural and containment soil
- Depth of the water table
Once the rigidity necessary for driving has been determined, the type of profile is determined and dimensioned.
Krah® high-density polyethylene structural pipes have the particularity of achieving high annular and longitudinal rigidity with very low weight. This is achieved by combining:
- The helical arrangement of the ribs, which give it longitudinal rigidity.
- The design of a structural profile dimensioned according to the requests of annular rigidity of the conduction, achieving efficiency and avoiding the oversizing of the pipes.
- The characteristic low specific weight of HDPE high-density polyethylene