BS EN ISO 9554:2019 pdf – Fibre ropes – General specifications

BS EN ISO 9554:2019 pdf – Fibre ropes – General specifications.
1 Scope This document specifies the general characteristics of fibre ropes and their constituent materials. It is intended to be used in conjunction with the standards for the individual types of fibre rope, which cover the physical properties and specific requirements for that particular product type. This document also gives some information on the use of fibre ropes and also on their inspection and retirement criteria. This document does not intend to address all of the safety matters associated with its use. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1968, Fibre ropes and cordage一Vocabulary ISO 2307, Fibre ropes – Determination of certain physical and mechanical properties 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 1968 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: – ISO Online browsing platform: available at https://www.iso.org/obp -IEC Electropedia: available at http://www.electropedia.org/
Typical characteristics for these materials are given in Annex A. Specific applications should involve technical discussions with rope manufacturers. 4.2 Construction and structure 4.2.1 Laid ropes Unless otherwise specified, 3-, 4- and 6-strand laid ropes shall be Z-twist (right-hand lay), their strands S-twist and their roping yarns Z-twist. 4.2.2 Braided ropes The 8-strand braided ropes shall consist of four S-twist strands and four Z-twist strands arranged so that S-twist strands alternate (individually or in pairs) with Z-twist strands (individually or in pairs). The 12-strand braided ropes shall consist of six S-twist strands and six Z-twist strands arranged so that S-twist strands alternate (individually or in pairs) with Z-twist strands (individually or in pairs). 4.2.3 Double-braided ropes A double-braided rope shall consist of a number of strands that are braided to form a core, around which additional strands are braided to form a sheath. The core lies coaxially within the sheath. The number of strands varies, based upon the size of the rope.
4.2.4 Covered ropes A covered rope consists of a core protected by a non-load bearing cover. A parallel rope construction is a covered rope where the core consists of a number of sub-ropes. 4.2.5 Strands Each strand shall consist of an equal number of rope yarns sufficient to provide the characteristics specified in the International Standard for the relevant product. For ropes of reference number 36 or higher, the number of yarns in each strand may differ by one yarn or +2,5 % from the intended number of yarns in the strand. The ropes and their strands should be continuous, without splice for standard delivered lengths or shorter lengths. However, some lengths or methods of manufacture impose limitations. To overcome these limitations, strand interchanges can be used, these shall be in accordance with 4.4.3. Yarns may be joined as necessary. The strands can be assembled yarns. 4.2.6 Lay length or braid pitch The manufacturer shall establish the lay length or the braid pitch of the rope according to its intended use, or based upon the purchaser’ s acceptance. NOTE For a given reference number of rope, the smaller the lay length or braid pitch, the harder the rope will be. This hardness can affect the estimated breaking strength of the rope. 4.3 Treatment 4.3.1 Polyamide and polyester ropes 4.3.1.1 Polyamide and polyester laid ropes that are required to be heat set to ensure lay and dimensional stability are designated as type 1 ropes in the relevant product standard. 4.3.1.2 In other cases, polyamide and polyester laid ropes that are not required to have a heat setting on the rope are designated as type 2 ropes in the relevant product standard.