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Large pipe technology from Krah used for wastewater treatment plant in peru

Earlier this year, pipe/tube winding equipment manufacturer PPA & Krah supplied polyethylene pipes DN/ID 3000 for a deep water outfall pipeline in Lima, Peru. Krah said that previously the company had successfully installed large outfall pipelines in the Mediterranean Sea and Atlantic Ocean, but that one of the challenges in this project was to open a new site for the Krah large pipe technology in the Pacific Ocean.

WastewaterThe Taboada wastewater treatment plant is one of the largest constructions for sewage treatment in the world and the aim of the project was to boost the treatment of sewage water in Lima and the neighboring city of Callao, while reducing ocean pollution and also improve the health conditions in the area. The Taboada plant, which is located in Callao, is reportedly the largest water-treatment center in South America and will increase sewage treatment to 75% from the current 16%, according to the La Republica.

A wastewater treatment plant normally needs a large outfall to comply with the project requirements. The dilution and hydraulic calculations were made and a pipe with an internal diameter of 3.000 mm was selected. The outfall is located in a seismic-sensitive region and it must be corrosion free.

It was decided by the end-user and main contractor to consider the large diameter helical structured polyethylene pipes (according to DIN16961) fabricated with Krah technology combined with electro fusion technology to meet the project requirements.

The pipes and fittings were manufactured and fabricated by PPA & Krah in Spain and were then sent to Lima in four different shipments. Each pipe had a length of 6 m and the wall construction was not solid - it was a structured wall design, with the same or better characteristics than a solid wall pipe. Due the unique production process, the pipes have no frozen stresses in the pipe wall and the profiled wall structure can be designed tailor made for the application requirements.

The helically wound pipes and fitting were welded by a patented electro-fusion welding procedure and it was ballasted on site before the launching of the sinking strings to the sea from the working ramp made onshore. By fixing them on special points of the special made pipes, all ballast blocks had no screws and bolts, so there's no chance of an unwanted sliding of the blocks.

"The construction of the sea outfall, La Taboada, was an amazing challenge for the PPA Group," the company said. "Up to 19 sinking strings were sunk and connected off-shore. The deepest point of the installation was -20 m in the Pacific Ocean and every string was joined by integrated flanges."

Source: PlasticsToday

Helical Wound HDPE Pipes

A wonder material of construction

"Plastindia Journal", September 2013 (English)

Over the last decades the inherent weaknesses of concrete, clay, ductile, PVC and steel caused tremendous problems in existing sewer pipe systems, as they tend to be brittle or are too sensitive to aggressive chemicals and soil conditions. Failures had becoma a common occurrence worldwide in sewer and other large-diameter pipe applications. In addition they have a unprofitable relation between cost and benefit. 

Please find the complete article here:

And the WINNERS are...

Krah Calendar 2014


In the upcoming year, many will be faced with the question: What's this got to do with pipes?

So one or the other may have also marveled at the international plastics trade fair K2013, when he was confronted with the new designs of the Krah Calendar 2014. The answer to the question?

Weiterlesen ...

Estonian Krah Pipes supports Amur tiger


20131023 105937It all started with an idea to arrange a family day in Tallinn Zoo for our collegues and their families. And nobody really expected it to evolve into something as meaningful and profound as starting a sponsorship for one of the Tallinn Zoo Amur tigers named Pootsman.

The Amur tiger (formerly known as the Siberian tiger) is one of the largest cats in the world and is found only in the Russian Far East with a small number ranging across the border into China and possibly North Korea.

The tiger Pootsman was brought to Tallinn from Moscow Zoo at the end of the year 2012. This young male is less than three years of age and he is a very valuable animal for breeding purposes as both his parents are from the wild. 

Amur tigers are one of the larger tiger sub-species.  Average weight for males is 160-190kg, while females are smaller, at 110-130kg.

Amur tiger’s coat colour is a lighter orange compared to other tiger sub-species and it becomes even more evident in winter. The bright coat colour along with the black stripes have a slight resemblance to our pipes’ interior colour and outside structure. Should one search for an animal to be the patron of our company, tiger is the first that leaps into mind.

Amur TigerThe small wild population of Amur tigers has led to them being classified as endangered species and this is mainly the result of human activity. Fortunately the Amur tiger has gained protection and started to recover in numbers due to the intensive conservation efforts.

Starting from October 2013 Krah Pipes OÜ is yet another supporter of the conservation of the Amur tiger.

Cooperation empowers the efforts made and we are proud and honoured to be part of the Amur tiger conservation program.

Amur tiger

Large Outfall Pipeline up to DN/ID 3000 mm, jointed by electro fusion.


New Video in the KRAH AG channel (youtube:

Nice large outfall pipes or intakes pipes are shown in this video, to show that our Krah Large Pipe Technology can be used for these kind of application. All jobs were executed by the Spanish company PPA&Krah (

The video:

The complete video and additional information will be shown at the K2013, hall 16 D77.

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