Techduto DW

Double-wall HDPE pipe — cable protection and high-flow drainage

Techduto DW tubos corrugados parede dupla vista 2

Tubos Techduto DW em composição estúdio vista 3

Três tubos Techduto DW em fileira estúdio vista 4

Diameters

110–200 mm

Compression

900–1,000 N

Ring Stiffness

SN 8

Interior

Smooth — high flow

Standard

NBR 15715

Double-wall HDPE conduit for telecommunications, fiber optics, and electrical networks. Smooth interior for friction-free cable routing, compressive strength of up to 1,000 N, and compliance with NBR 15715.

NBR 15715-certified protection? Learn more about Techduto NBR

Downloads Technical Catalogue PDF — Full specifications

The Problem

Buried electrical cables in metal conduits corrode and demand constant maintenance. For water drainage, single-wall pipe has a rough inner surface that cuts flow capacity, and its low stiffness lets the pipe deform under heavy backfill.

Both problems are expensive: stoppages on telecom projects, head loss in stormwater galleries, and rework on highways and railways.

The Techduto DW Solution

Techduto DW solves two problems with a single product: mechanical protection for electrical cables and hydraulic capacity for water drainage. The double wall (corrugated exterior + smooth interior) delivers SN 8 ring stiffness and compression of 900 N or more — above the NBR 15715 minimum. For water, the smooth interior lowers hydraulic roughness (low Manning coefficient) and maximizes flow. For cables, it guides the pull without deforming and without scuffing fiber-optic jackets. No corrosion, no maintenance, 50+ year service life.

Technical Specifications

Technical data of Techduto DW

Gauge	Nominal Diameter	O.D. (mm)	I.D. (mm)	Ring Stiffness	Compressive Strength	Packaging
4"	110 mm	111.6 ± 0.4	94.8 ± 0.3	SN 8	≥ 900 N	Sticks 6 m
6"	160 mm	162.0 ± 0.5	141.0 ± 0.4	SN 8	≥ 900 N	Sticks 6 m
8"	200 mm	203.8 ± 0.8	170.5 ± 0.5	SN 8	≥ 900 N	Sticks 6 m

Ring stiffness class SN 8 per NBR 15.715 + ISO 21138. Compressive strength ≥ 900 N (standard requires ≥ 680 N). Impact resistance ≥ 9 out of 12 specimens without cracks. Joint tightness: 0.05 MPa pressure / 0.03 MPa vacuum.

Why Techduto and not a reseller: since 1986, when it built Brazil's first corrugating machine by hand, Techduto has designed and manufactured its own line of corrugated pipes — it doesn't resell, it produces. Today, with factories in São José dos Campos (SP), Recife (PE) and Primavera do Leste (MT), the engineering behind Techdreno and Drainage Geocomposite is entirely its own. See our full history →

Why choose Techduto DW

Ring Stiffness SN 8

Compression up to 1,000 N

Smooth Interior, +30% Flow

Corrugated Exterior, Flexible

Chemical Resistance

Dual Certification

Applications

Where Techduto DW makes the difference

Drainage

Urban Stormwater Galleries

Stormwater drainage on urban roads — the smooth interior increases flow capacity.

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Energy / Cables

Photovoltaic Power Plants

Mechanical protection for solar cables, with SN 8 ring stiffness under backfill.

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Drainage

Highway Drainage

Subgrade and stormwater drainage on highways — withstands heavy traffic loads.

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Cables

Telecom and Power

Protected routing of medium/low-voltage and fiber-optic cables in underground works.

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FAQ

Common questions about Techduto DW

Techduto DW features a double-wall design (corrugated exterior + smooth interior) with a compressive strength of 900 to 1,000 N depending on diameter, making it ideal for friction-free cable routing. Techduto NBR is a single-wall corrugated conduit with up to 750 N of impact resistance, suitable for general cable protection applications.

Yes. The smooth interior eliminates the friction that cables experience in the grooves of standard corrugated tubing. This protects the optical fiber coating and significantly reduces installation time.

Techduto DW is available in 110, 160, and 200 mm diameters, supplied in 6-meter lengths in accordance with NBR 15715.

Techduto DW is primarily designed for cable and telecommunications protection. For fluid conveyance, please consult our technical team for recommendations on the most suitable product for your project.

Yes. With a compressive strength of up to 1,000 N, the Techduto DW can be installed under highways and in areas with heavy traffic, provided the recommended minimum burial depth is observed.

Yes. HDPE is naturally resistant to corrosion and to chemical and biological agents in the soil. It has a service life of over 50 years without requiring maintenance or replacement.