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PROCESSING | LARGE DIAMETER PIPE


advantage, says Krah, is the ability to customise their wall design according to the needs of the project. Krah categorised the pipes in three types,


according to the depth at which they had to be buried (ranging from 4m to 15m). Part of the pipeline will also pass along concrete bridges. Electrofusion joining helps speed up installation and can be carried out at a rate of around 36m/ day. A pneumatic control test is performed every after joint is made – as joint tightness is vital for the project. Krah adds that the non-corrosive – yet flexible –


Above: A 54in diameter HDPE pipe – installed using HDD – won an award from PPE recently


In addition, there are six water feed pipes that are 1,100mm pressure pipes. These supply the facility with seawater – which is then treated and discharged back into the sea through the central pipe. An even larger version is already being designed – with a diameter of 44m and height of 30m.


Hydropower pipe Krah of Germany is supplying large diameter pipe to a huge hydropower project in the Philippines. The 14.5MW Siguil Hydro power plant, in Mind- anao, is expected to be completed in 2022. The 18km headrace pipeline of DN/ID 2000mm – which links collected water from a weir to the power house – has been replaced by Krah’s struc- tured wall pipes. The pipeline’s original design used glass-fibre pipes. The decision to switch was made in order to ensure on-schedule delivery of the project. Krah says that the physical characteristics of its pipes – such as workability, durability, and easy on-site weldability – make them easier to lay in the steep terrains of the mountain landscape. Another


nature of the pipes makes them superior to other pipe material candidates, such as GRP and ductile iron. Krah is also involved in other hydropower


projects in the Philippines. In one – also a headrace pipeline project – the original design called for a reinforced concrete box culvert. This would have taken three years to complete – but Krah pipes are likely to help cut this in half, says the company.


Pipe award In the USA, companies including JM Eagle and Agru America scooped awards at the PPI projects of the year. In the Municipal & Industrial division, the compa- nies supplied and installed 54in diameter HDPE pipe for a new 7.5 mile main sewer in Fort Lauderd- ale, Florida. The project used horizontal directional drilling (HDD) to install the pipe. The US$65 million wastewater transmission line


from the GT Lohmeyer wastewater treatment plant to the wastewater lift station was completed earlier this year – several months ahead of schedule.





long time experience leads to best


performance extruders regardless the application


IMAGE: PPI


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