PRESSURE PIPES | MATERIALS
Pressure pipe systems – in a variety of plastic materials – have recently been used in applications as diverse as a drought-relief project and a large gas supply main
Resisting the force: latest in pressure pipe
Pressurising pipe helps to ensure that more fluid – be it gas, water or anything else – can be trans- ferred more efficiently. While steel systems have the necessary burst pressure to allow high pres- sures, plastic pipe systems – in a variety of materials – are often specified due to their lightness and resistance to corrosion. Agru of Austria recently supplied a double containment piping system for the sewage systems of ‘floating houses’ on the shores of a lake. Wastewater from the houses, on the Brombach-
see near Nuremberg, are transported to a tank on the mainland, via a wastewater pressure pipe laid in the lake. From here, the collected wastewater is forwarded to the sewage treatment plant. Sewers in areas such as the Brombachsee must comply with special precautions. In this zone, pressure pipes with a very high-risk potential must be double containment systems. Another chal-
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lenge was the rising and falling water levels. The pipes connected to the pontoons – which serve as a floating basement for the houses – reach to the mainland. Therefore, the pipeline had to be flexible enough to compensate for the difference in water levels, which can be up to 8m.
Double containment The answer was to use Agru’s Poly-Flo double containment piping system, which is made of PE 100-RC. The double-containment pipe is extruded as a mono strand, which offers high system security. Possible leaks on the inner pipe can be detected in the existing annulus by the leak detection system installed there. The outer pipe restrains the flow medium so that it cannot escape into the lake. Both walls of the double-walled system are moni- tored for leaks. The monitoring pressure is higher than any other internal or external wall applied
Main image and inset: Agru’s double containment piping system, for a sewage system on a lake, is extruded as a mono strand for high system security
May 2020 | PIPE & PROFILE EXTRUSION 23
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