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Steel strip sheaths for prestressing tendons. Terminology, requirements, quality control Ingestion-build-48974 3:1992 and BS 6100-21 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