1 Scope
This European Standard is applicable to uncoated cylindrical steel sheaths with a
corrugated profile and with a nominal internal diameter of up to 130 mm and their
connectors (couplers) which are assembled to form ducts for prestressing tendons in
post-tensioned prestressed concrete structures. It is only applicable to sheaths and
connectors made of interlocked or welded steel strip1). It does not cover plastic sheaths2).
The seals required between sheaths and couplers are not covered by this standard.