Post-Tensioning Systems

Corrugated Metal
Duct Systems

Round and flat corrugated metal sheaths and production solutions for post-tensioning projects.

Explore Products Request a Quote

EN 523 / EN 524
Made in Türkiye
Worldwide Delivery

Sheaths

Product Categories

Round sheaths, flat sheaths, sleeves, machines and on-site production. Select published sizes and request a quote.

View

Round Sheaths

Cylindrical corrugated steel sheaths for prestressing tendons. Available across published diameter ranges and steel thicknesses.

0.40–0.60 mm · diameter range View Product

Flat Sheaths

Flat corrugated profiles produced from defined round diameters for spatially constrained post-tensioning layouts.

0.40 / 0.45 mm · 66/22–94/28 View Product

Production Machines

Round and flat sheath production lines. Installation, training and spare parts as a service path.

Factory and site systems View Product

On-Site Production

When transport volume, programme or remote location make factory-only supply impractical, production machines can be shipped to site with setup, training and supervisor support.

Machine Mobilisation View Product

Catalogs

Technical catalogues, datasheets and certificate files — downloaded when published.

PDF · technical documents View Product

Worldwide Shipping

Why DUSO?

Technical solutions for post-tensioning projects — from manufacturing to site support.

EN 523 / EN 524 Compliance Relevant standards and controlled production framework. Controlled Production Factory production and quality-control processes. On-Site Production Production capability at project sites. Worldwide Shipping Packaging and international supply capability. Technical Support Installation, training and supervisor support. Production Machines Round and flat sheath production systems.

Production

Production Capacity

Incoming steel, corrugation, laser cutting, dimensional checks, packaging and dispatch operate as a single production sequence.

3,000 m/day
EN 523 Class 1 Production Capacity
2,500 m/day
EN 524 Class 2 Production Capacity
0.40–0.60 mm
Published steel thickness programme

Visit the facility →

Quality & Production Technology

Dimensional control, quality tracking and precision cutting at every production stage.

Quality Control

Testing & Quality Control

Dimensional, surface and production checks from incoming material to dispatch.

View Quality Process →

Precision Production

Burr-Free Laser Cutting

Clean, precise and controlled cutting that supports joint and assembly quality.

View Laser Cutting →

08 / Dispatch

Worldwide Shipping

Los destinos de exportación incluyen Rusia, Dinamarca, Italia, Irak, Kuwait, Israel y Francia. El destino del proyecto y las condiciones de transporte se confirman en la oferta.

View Packaging & Shipping →

Factory storage — Products are stored under appropriate conditions until shipment.
Loading — Loading sequence is planned against the transport unit.
Rusia · Dinamarca · Italia · Irak · Kuwait · Israel · Francia

Embalaje de fábrica y despacho de exportación.

09 / Projects

Case records, when released.

Published case records list authorised photos and country data. No tonnage or client is invented.

Russia

Russia Infrastructure Project

Infrastructure · Post-Tensioning · Round Sheath

Field photos and application details from a Russia project using DUSO round corrugated metal sheaths in post-tensioning works.

Product: Round Corrugated Sheath
Application: Post-Tensioning
Solution: Factory Production + Site Support

View Project →

Resources

Technical library.

Catalogues, company profiles, datasheets and certificates — published files are downloadable.

Catalogs

Product and machine catalogues.

Browse Catalogues Technical Documents

Technical documents and data sheets.

Browse Documents Certificates

Material and quality documentation.

Browse Certificates FAQ

Specification and process questions.

Browse FAQ

FAQ

Frequently Asked Questions

View All Questions →

What is the difference between round and flat ducts?

Round ducts are cylindrical sheaths. Flat ducts are formed profiles used where structural depth or tendon layout makes a round section impractical. DUSO flat sizes are produced from defined round diameters (for example round 60/65 → flat 72/21), so coupler and process selection still refer to the round origin.

Which steel thicknesses are available?

Published production thicknesses are 0.40 / 0.45 mm, 0.50 mm and 0.60 mm. Not every diameter is produced in every thickness; use the technical tables.

What is EN 523?

EN 523:2003 is the European standard “Steel strip sheaths for prestressing tendons — Terminology, requirements, quality control.” It applies to uncoated cylindrical corrugated steel sheaths and couplers made from interlocked or welded strip, with nominal internal diameter up to 130 mm. Categories described in public summaries include Category 1 (normal) and Category 2 (rigid). Seals between sheath and coupler are outside its scope.

Can corrugated ducts be produced directly at the project site?

Yes. This is a core DUSO offering: production machines are shipped to site, configured, installed and operated with training and optional supervisor support.

Is worldwide delivery available?

El embalaje de exportación y la entrega mundial forman parte de la oferta comercial. Destinos de exportación: Rusia, Dinamarca, Italia, Irak, Kuwait, Israel y Francia; destino y condiciones confirmados por oferta.

Can customers purchase duct production machines?

Yes. DUSO supplies production machinery as capital equipment, including mobile/on-site configurations.

Quote

Request a project-specific quote.

Share your technical requirements for round or flat sheaths, production machines and on-site manufacturing.

Request a Quote Contact

Corrugated Metal
Duct Systems

We Bring Production
Directly to the Project Site

Round and Flat
Sheath Production Systems