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Sewage collection tank for sewer system

Around 100 km from Stockholm you will find Västeras, a large city at Lake Mälaren, the third biggest lake in Sweden. Västeras is a big industrial city that was founded over 1000 years ago. In the past year they had some trouble with leakages in the sewer system. High rainfalls had led to full pipes which resulted in an overflow into Lake Mälaren.

Sewage collection tank during installation
Sewage collection tank during installation
Krah Pipes Manhole
Krah Pipes Manhole

Therefore a quick, durable and reliable solution was needed. The engineering company Mälar Energie AB contacted Krah pipes yet again in January 2017 to plan the project for a 950 m³ sewage collection tank of DN/ID 1600 mm with a DN/ID 2000mm manhole. The first pipes were shipped already in October 2017, the project was finished in March this year. The manhole is equipped with a flow regulator 150 l/s from Mosbaek A/S. The incoming flow to the manhole is 350 l/s if the incoming pipe is working with full capacity. The pipes were delivered in lengths of 6 Meter including rubber gasket. In a whole, 41 trucks were needed to deliver the whole amount to the construction site.

Underground water conduit to be reconstructed
Welding of CORSYS PLUS DN/ID 2000 mm from inside using two welding units

This was the third magazine of this kind they do in Västeras. It is known as a kommun that only installs plastic pipes.The construction company, Salboheds Construction and Civil Engineering AB, was impressed with the Krah technology: “Fast and easy installation, even with the pipes being so big. The manhole was installed and working in less than two hours. They also did a video inspection of the inner layer after installation and the inner surface was fantastic, bright and smooth. The prefabricated parts were of high quality and fitted perfectly into the system.”    

Rene Aguraiuja
Kommertsjuht / Commercial Manager 
Krah Pipes OÜ, Estonia