NC Line Technology:
Non-Circular Filament Winding
Advanced GRP pipe technology for the rehabilitation and construction of non‑circular channels.
Amiblu NC Line technology is a specialised GRP manufacturing solution designed for non‑circular pipe profiles. Amiblu NC Line pipes are ideal for relining old city sewers, culverts, and channels, which often feature non‑circular geometries. These pipes are engineered to deliver high bending strength, improved chemical resistance, and a long expected service life. Non‑circular pipes can be customised to meet specific project requirements and easily adapted to a wide range of shapes and geometries.
Amiblu NC Line pipes meet the requirements of ISO 16611, which sets strict guidelines for the design, manufacture, and testing of non‑circular pipes. Compliance is verified by external certification bodies.
Wall structure of a non-circular filament wound GRP pipe
- Inner protective layer
- Inner structural layer
- Core layer
- Outer structural layer
- External protective layer
Hover or click a layer to explore the structure
Wall structure of a non-circular filament wound GRP pipe (NC Line technology)
Manufacturing of Amiblu non-circular GRP pipes
GRP pipes produced with NC Line technology are manufactured using a filament winding technology. Resin-filled continuous and chopped glass fibres are wound on a rotating non-circular mandrel in a controlled process. Using this technology, a very dense laminate is created that maximises the contribution from the three basic raw materials: glass fibres, resin and sand. The pipe wall is designed as a sandwich structure working according to the I-beam principle: the core layer resists shear forces, while the inner and outer structural layers withstand bending moments acting on the pipe.
Material compositions, laminate thickness, and pipe geometry are defined project by project, allowing engineers to tailor bending strength and stiffness to the specific structural demands of each application. The curing process is completed in the factory, meaning that high humidity in sewers or underground structures does not affect product performance or quality.
After curing, pipes are finished and equipped with either elastomeric gasket joints for fast installation in humid environments or glued joints for curved pipelines and special geometries like dry weather channels.
Technical data GRP pipes produced with NC Line technology
| Main materials | resin, glass fibres, sand |
|---|---|
| Main materials | resin, glassfibers, sand |
| Operating temperature | -50 °C to +50 °C, higher temperatures may be considered for individual projects |
| Cross sections | 600-3000 mm |
| Pressure range | PN 1 |
| Corrosion protection | none needed, as materials used are inherently resistant to corrosion |
| Water jetting resistance | tested according to DIN 19523 |
| Standards | manufactured and tested according to ISO 16611 |
Key benefits of the
NC Line technology
The laminate structure provides exceptional bending strength, enabling Amiblu NC Line pipes to stabilise and strengthen deteriorated non-circular channels.
The chemically resistant inner liner is specifically designed to withstand aggressive sewer environments, including sulfuric acid exposure.
High impact resistance ensures safer handling and minimises the risk of damage during transport, installation, and backfilling, especially in open trench installations.
Amiblu NC Line pipes are available in egg-shaped, arch-shaped, parabolic, and fully customised profiles, allowing optimal hydraulic performance and structural compatibility with existing channels.
Exclusive NC Line licensee in Belgium
In Belgium, Amiblu collaborates with VIVAQUA, a cooperative company bringing together the 19 municipalities of Brussels, four Walloon municipalities and the intermunicipal association in BW. VIVAQUA supplies drinking water to Brussels and parts of the Flemish and Walloon Regions and manages sewer networks and most stormwater basins in Brussels. As an exclusive NC Line licensee, VIVAQUA uses Amiblu non-circular pipes to deliver efficient, high-quality infrastructure solutions tailored to its network needs.
