CASE STUDIES
Above-ground pipe with flexible aramid liner
A paper mill in southern Germany was looking for a suitable solution to return its treated wastewater to a river above ground. Rädlinger primus line GmbH realised the task with its self- developed and reusable Primus Line® Overland Piping system.
Low water levels and aquatic ecology are a major issue throughout Europe. The constraints on companies that rely on water extraction from rivers, streams and lakes are increasing. This also affects a paper mill in southern Germany.
The mill operator takes out water from a mid-mountain stream for paper production and returns it to a canal several hundred metres below the point of withdrawal. For environmental reasons, the paper mill was instructed to return the purified process water to the extraction spot.
The company approached Rädlinger primus line GmbH who were able to offer a suitable solution with the Primus Line® Overland Piping system.
What is Primus Line® Overland Piping?
Primus Line® Overland Piping is a reusable solution specifically designed for above-ground pipelines in order to be able to safely transport
demanding and potentially hazardous media such as industrial wastewater, brine, process water etc. The system consists of two components: an aramid-reinforced liner and specially developed connectors.
Up to 4,000 metres of the flexible pipe are supplied on a reel, unrolled from it and laid directly – even in difficult terrain. (Figure 1) The pipe naturally conforms to the surface structure. Depending on the diameter (nominal widths from DN 150 to DN 350), the maximum operating pressure ranges from 56 to 20 bar. The inner layer is made of thermoplastic polyurethane (TPU), which is corrosion resistant and offers a high abrasion and chemical resistance that even withstands contact with highly corrosive hydrocarbons. The Kevlar® fabric reinforcement gives Overland Piping its high tensile strength, enabling it to absorb even very high operating pressures completely. The TPU outer layer protects against UV radiation and abrasion and provides the flexibility required for multiple installations and the ability to roll up the reusable system.
The connectors ensure a leak-free joint. Specially designed high- pressure end fittings with flanges or special quick couplers are used to connect the pipework. They can also be connected to
Fig 1: Adapts to the surface: flexible, above-ground pipe
26 | August 2024 |
www.draintraderltd.com
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