Materials & Profiles

The unbonded composite structure of an NKT Flexibles' pipe allows the careful selection of materials to meet the specific requirements applicable for that particular layer. The materials used by NKT Flexibles are supplied by recognized and prequalified raw material suppliers.

Throughout the manufacturing process, NKT Flexibles utilises stringent procedures to ensure full traceability of materials used for the manufacture. Complete material and manufacturing records are provided to the Client in the final documentation package. Normally all steel materials are supplied with EN10204 3.1.b. certificates.

1. Carcass
An interlocking structure manufactured form a metallic strip. The carcass prevents collapse of the inner liner and provides mechanical protection against pigging tools and abrasive particles.

2. Inner liner
An extruded polymer layer providing internal fluid integrity.

3. Pressure armour
A number of structural layers consisting of helically wound C-shaped metallic wires and/or metallic strips. The pressue armour layers provide resistance to radial loads.

4. Tensile armour
A number of structural layers consisting of helically wound flat metallic wires. The layers are counter wound in pairs. The tensile armour layers provide resistance to axial tension loads.

5. Outer sheath
An extruded polymer layer. The function is to shield the pipe's structural elements from the outer environment and to give mechanical protection.

Anti-wear layers (not shown)
Non-metallic layers are incorporated in order to prevent wear and tear between the structural elements.

Insulation (not shown)
Additional layers of material with low thermal conductivity can be applied in order to obtain specific thermal insulation properties of the pipe.