ISO 18692-3:2020 pdf download – Fibre ropes for offshore stationkeeping
1 Scope
This document specifies the main characteristics and test methods of new high modulus polyethylene (HMPE) fibre ropes used for offshore stationkeeping.
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 — Vocabulary
ISO 18692-1:2018, Fibre ropes for offshore stationkeeping — Part 1: General specification
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1968 and ISO 18692-1 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/
4 Materials
The fibre used in the core of the rope shall be high-tenacity HMPE, with an average tenacity of not less than 2,5 N/tex, and qualified and tested in accordance with Annex A.
Rope cover material and other materials employed in rope assembly shall be in accordance with ISO 18692-1.
5 Requirements — Rope properties
5.1 Minimum breaking strength
The minimum breaking strength of the rope, when tested according to ISO 18692-1, shall conform to Table 1.
5.2 Minimum core tenacity
The minimum tenacity of the rope core shall be 1,3 N/tex, measured according to ISO 18692-1.
All samples tested shall comply with this minimum value.
5.3 Creep properties
The rope creep properties shall be at least as declared by the manufacturer, when tested following the method in Annex B.
5.4 Torque properties
Torque-neutral rope or torque-matched rope shall be defined according to ISO 18692-1.
5.5 Cyclic loading performance
The rope shall have demonstrated performance under cycling loading following the requirements of ISO 18692-1.
5.6 Particle ingress protection
Unless otherwise specified, the rope shall be constructed with a protection of the core against the ingress of particles in accordance with ISO 18692-1.
6 Requirements — Rope layout and construction
Rope layout and construction shall be in accordance with ISO 18692-1.
7 Rope testing
7.1 Type test
7.1.1 General
Type tests shall be performed in accordance with ISO 18692-1 and the specific requirements of this clause.
7.1.2 Sampling
The number of rope samples to be tested is given in Table 2.
7.1.3 Breaking strength tests, core tenacity, and stiffness tests
The number of samples from Table 2 shall be tested, and each sample shall be capable of meeting the requirements of 5.1 and of 5.2. NOTE The measurements of the dynamic stiffness at end of bedding-in — and, when required, those of the quasi-static stiffness and the dynamic stiffness at several mean load level — are performed for design purposes only. There are no acceptance criteria on these parameters.
7.1.4 Creep properties test
One sample shall be tested for creep properties in accordance with the test method in Annex B. This test needs not be performed where data are available from the previous qualification test of another rope (or a sub-rope of it) with the same design, material and method of manufacture of rope core, and a size not less than reference number 71.