Slotted Drainage Conduit Pipe PipeKorr – Single-wall corrugated HDPE with slotting for drainage

The NTET Drainage from Conduit range includes single-wall corrugated HDPE pipes with slotting for the collection of rainwater and groundwater. Derived from the proven conduit line, they are available in three configurations to suit every installation requirement.

The 750N bars version offers higher compression resistance for structural buried installations. The 450N rolls versions (black and green) are ideal for sites where flexibility and fast installation are priorities. All comply with EN 61386-24.

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Slotted Drainage Conduit Pipe

Available configurations

Three versions to cover every need: high-resistance rigid bars, black flexible rolls for fast installation and green rolls for immediate visual identification.

Rigid bar version with 750 N compression resistance. Diameters DN 110–200 mm, standard lengths 6 and 12 m. For structural buried installations where higher mechanical resistance is required.

Parameter Value Unit
Resistenza a compressione 750N
DN/OD 110 → DN/ID 92 Barre 6 / 12 m
DN/OD 125 → DN/ID 104 Barre 6 / 12 m
DN/OD 160 → DN/ID 136 Barre 6 / 12 m
DN/OD 200 → DN/ID 172 Barre 6 / 12 m
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Technical specifications

Mechanical characteristics

Version Compression resistance Format Standard
750N Bars 750 N Bars 6/12 m EN 61386-1 / EN 61386-24
450N Rolls 450 N Coils 25/50 m EN 61386-1 / EN 61386-24
450N Green Rolls 450 N Coils 25/50 m EN 61386-1 / EN 61386-24

Slotting may affect mechanical performance compared with the intact pipe.

Structure and material

  • Material: High-Density Polyethylene (HDPE)
  • Structure: Single-wall corrugated
  • Colour: Black (standard versions) / Green outside + Black inside (green version)

Types of slotting

  • Type A: Perforation on multiple quadrants (alternating 30°/90°) — used for diameters up to DN 125
  • Type B: Perforation on reduced sectors — used for DN 160 and DN 200

The perforation of the 750N bar versions is circular-section, with alternating 30°/90° angular distribution around the perimeter.

When to choose 750N Bars vs 450N Rolls

  • 750N Bars: Buried installations with higher loads, applications where rigidity is important, straight runs
  • 450N Rolls: Shallow or light installations, long runs without joints, sites where flexibility simplifies installation
  • 450N Green Rolls: Same performance as the black version, but with green colour for immediate identification of drainage networks compared with electrical conduits

Technical documentation

Scarica le schede tecniche per ciascuna versione del tubo fessurato drenaggio da cavidotto.

Applications

Slotted conduit drainage pipes are intended for light drainage in building, residential and plant engineering applications.

  • Perimeter drainage for buildings

    Collection of infiltration water around the foundations of residential and commercial buildings. The 450N rolls allow continuous installation without joints.

  • Drainage for gardens and green areas

    Management of rainwater in green areas, flowerbeds and roof gardens. The green version makes identification easier during maintenance.

  • Under-floor drainage

    Collection of moisture under floors and screeds to prevent rising damp.

  • Cable trench drainage

    In electrical and telecommunication cable trenches, the drainage pipe runs alongside the conduit to evacuate infiltration water and protect the installations.

FAQ

The 750N version has a compression resistance of 750 Newtons, is more rigid and is available only in bars (6 and 12 m). The 450N version withstands 450 Newtons, is flexible and available in rolls (25 and 50 m). For buried installations with significant loads, choose 750N; for light installations and long runs, choose 450N.

The green version is for visual identification: on sites where electrical conduits (generally black) and drainage networks coexist, the green colour immediately distinguishes drainage pipes from cable conduits, facilitating maintenance and preventing errors.

These pipes are single-wall corrugated, with compression resistance (450/750 N) and small diameters (DN 63–200). PK Drainage pipes are double-wall, with SN4/SN8 annular stiffness and diameters up to DN 1200 — designed for infrastructure and major works.

The roll versions use type A slotting (perimetral) for diameters up to DN 125 and type B slotting (reduced) for DN 160–200. The bar versions have circular perforation with alternating 30°/90° angular distribution. Customizations on request.

Yes, the slotting/perforation process may slightly reduce compression resistance compared with the intact pipe. The stated values (750 N / 450 N) refer to the non-slotted pipe.

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