MATERIALS | PRESSURE PIPES
“The benefits of greater operational safety, longer service life and better protection of our drinking water from the Traunsee reservoir far exceed the slight additional cost of pipes with the protective layer,” said Josef Leidinger, a water engineer and manager of the Altmünster sewer department. The original sewer line, installed in 1970, comprises two sewage pipes (of OD 300mm) laid side by side in the lake over a length of 2.3km. This would ensure operations were maintained in case of pipe rupture. Wastewater is pumped alternately through one
Above: Agru’s PE100 pipe has replaced a 48-year-old sewage pipeline in Austria
kilometers of PVC-O pipelines across Africa, which are certified according to the specifications of the South African Standard SANS 16422. According to an article in the local Business
Report newspaper, the R300 million (US$23m) plant uses Molecor technology to produce pipes for the agricultural, civil and industrial sectors for use both within the country and further afield in Africa. The plant will produce pipe in diameters of 110-800mm – with plans to extend to 1000mm – in pressure ratings up to 25 bar working pressure. Molecor has also expanded its range of pipes with a 710mm diameter product. Its DN710 pipe – available in nominal pressures of 12.5, 16, 20 and 25 bar – joins the existing range of pipe, which is available in diameters from 90 to 800mm. The company launched its 800mm diameter pipe in 2015 – which it says is currently the largest in the world – but is already setting its sights on 1200mm diameter PVC-O pipe. The company says that demand for larger water mains is pushing up the demand for larger pipe sizes – and has specu- lated that PVC-O of 2000mm diameter will be available in future. Recently, Molecor’s 800mm pipes were installed in an irrigation project in Spain, where they replaced 700mm reinforced concrete pipe that was in a bad condition. The project, in Lobon, covered an area of 3,000 hectares. The new pipe, rated to 16 bar, runs for a length of 220m and was installed last year.
Water pressure Other applications required different materials again. Agru recently installed PE100 pipes in Altmünster, Austria to replace a 48-year-old sewage pipe that runs through the Traunsee lake. The new line comprises Agruline PE100-RC pipes – with protective layer – of OD 355mm in SDR 17.
20 PIPE & PROFILE EXTRUSION | May 2018
of the pipes every day, ensuring an even abrasion on each. In the first few hundred meters of the PE pipeline, pump pressure builds up several times a day to propel the water column. The beginning of the line had been particularly stressed over the previous decade. The old pipe has now been replaced by a 3,215m long double sewage pressure pipe. Two parallel PE100-RC pipelines were installed in two phases. It began in 2015/2016 with Agru PE100-RC pipes (with protective layer) in the eastern, 800m long section. After the two sewer pipes were welded from 12m long Agru Sureline III pipes with protective layer, two 800 m long pressure pipelines were stored in the water along the river until they were installed. In this phase, the pipe was installed by horizon-
tal directional drilling – in which the pipe is dragged through an underwater tunnel with several tonnes of force. The pipes offer double protection against the stress of this operation: first, they are made of point-load- and crack-resistant PE100-RC; and, they have an extra protective layer made of scratch-resistant PP.
Blue boost Staying with polyolefins, Aquatherm has added to its Blue Pipe range for mechanical and industrial applications, with a new pipe called the SDR 9 MF RP. It uses polypropylene-random (PP-R) resin technology to boost performance in applications such as high-pressure risers, high-temperature heating and district heating, and industrial process systems where a high safety margin is required. The pipe is classified as a polypropylene raised crystallinity temperature (PP-RCT) material in accordance with ASTM F2389 and ISO 15874, as well as a PP-R 125 in accordance with ISO 12162. It had been a proprietary material under ASTM F2389, but is now a generic industry standard that refers to any newer generation PP material meeting the pressure and temperature requirements of ISO
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