Round or flat? First questions when selecting size
Round sheaths are cylindrical. Flat sheaths are produced from a defined round diameter where depth or tendon layout is constrained.
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EN 523 and EN 524: what they mean in sheath specification
EN 523 defines the product and quality framework; EN 524 defines test methods. Capacity classes follow the manufacturer’s production classification.
EN 523:2003 defines terminology, requirements and quality control for uncoated cylindrical corrugated steel sheaths and their connectors used with prestressing tendons. EN 524 specifies the related test methods.
Class/category wording in published daily capacity figures follows the manufacturer’s production classification. Certificate numbers and test limits are not listed here as marketing claims; they are issued with project documentation.
When writing a specification, request the standard name together with sheath type (round/flat), steel thickness and the dimension pair. A vague “EN compliant” phrase is not enough on its own.
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When does on-site production make sense?
When transport volume, programme or remote location make factory supply impractical, the machine goes to site and sheaths are produced on the project.
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Steel thickness programme: 0.40–0.60 mm
Published steel thicknesses are 0.40 / 0.45 / 0.50 / 0.60 mm. Weight per metre is listed with size and thickness.
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