Fibre ropes for offshore station keeping — Polyarylate

ISO/TS 19336:2015 specifies main characteristics and test methods of polyarylate fibre ropes used for offshore station keeping.

Cordages en fibres pour le maintien en position des structures marines — Polyarylate

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Status
Published
Publication Date
19-Aug-2015
Current Stage
9092 - International Standard to be revised
Completion Date
29-Sep-2022
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ISO/TS 19336:2015 - Fibre ropes for offshore station keeping -- Polyarylate
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TECHNICAL ISO/TS
SPECIFICATION 19336
First edition
2015-09-01
Fibre ropes for offshore station
keeping — Polyarylate
Cordages en fibres pour le maintien en position des structures
marines — Polyarylate
Reference number
ISO/TS 19336:2015(E)
ISO 2015
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ISO/TS 19336:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

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ii © ISO 2015 – All rights reserved
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ISO/TS 19336:2015(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Materials ....................................................................................................................................................................................................................... 2

4.1 Rope core material ............................................................................................................................................................................... 2

4.2 Rope cover material ............................................................................................................................................................................ 2

4.3 Other materials ....................................................................................................................................................................................... 2

5 Requirements — Rope properties ..................................................................................................................................................... 2

5.1 Minimum breaking strength ....................................................................................................................................................... 2

5.2 Minimum core tenacity .................................................................................................................................................................... 3

5.3 Axial compression fatigue properties ................................................................................................................................. 3

5.4 Particle ingress protection ............................................................................................................................................................ 3

5.5 Cyclic loading performance .......................................................................................................................................................... 3

6 Requirements — Rope layout and construction .................................................................................................................. 3

6.1 General ........................................................................................................................................................................................................... 3

6.2 Type of construction .......................................................................................................................................................................... 3

6.3 Rope core ..................................................................................................................................................................................................... 3

6.4 Protective cover ...................................................................................................................................................................................... 4

6.5 Terminations ............................................................................................................................................................................................. 4

6.6 Length of rope .......................................................................................................................................................................................... 4

7 Rope testing ............................................................................................................................................................................................................... 5

7.1 Type testing ............................................................................................................................................................................................... 5

7.1.1 General...................................................................................................................................................................................... 5

7.1.2 Sampling.................................................................................................................................................................................. 5

7.1.3 Breaking strength, core tenacity, and stiffness tests ......................................................................... 5

7.1.4 Axial compression fatigue properties test ................................................................................................. 6

7.1.5 Torque properties tests .............................................................................................................................................. 6

7.1.6 Linear density test .......................................................................................................................................................... 6

7.1.7 Cyclic loading (endurance) test ........................................................................................................................... 6

7.1.8 Protective cover thickness ....................................................................................................................................... 6

7.1.9 Particle ingress protection ...................................................................................................................................... 6

7.2 Testing of current production .................................................................................................................................................... 7

7.2.1 Sampling and testing .................................................................................................................................................... 7

7.2.2 Length measurement ................................................................................................................................................... 7

8 Report .............................................................................................................................................................................................................................. 7

8.1 Prototype rope ........................................................................................................................................................................................ 7

8.2 Current production ............................................................................................................................................................................. 7

9 Certification ............................................................................................................................................................................................................... 7

10 Marking, labelling, and packaging ..................................................................................................................................................... 8

10.1 Marking ......................................................................................................................................................................................................... 8

10.2 Labelling ....................................................................................................................................................................................................... 8

10.3 Packaging ..................................................................................................................................................................................................... 8

Annex A (normative) Fibre qualification and testing ......................................................................................................................... 9

Annex B (normative) Rope testing .......................................................................................................................................................................12

Annex C (normative) Axial compression fatigue properties test .........................................................................................22

Annex D (informative) Guidance for rope handling care .............................................................................................................24

Annex E (informative) Certificate of conformity — Polyarylate ropes for offshore
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ISO/TS 19336:2015(E)

station keeping ....................................................................................................................................................................................................31

Annex F (informative) Commentary...................................................................................................................................................................32

Bibliography .............................................................................................................................................................................................................................38

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ISO/TS 19336:2015(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.

The committee responsible for this document is ISO/TC 38, Textiles.
© ISO 2015 – All rights reserved v
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TECHNICAL SPECIFICATION ISO/TS 19336:2015(E)
Fibre ropes for offshore station keeping — Polyarylate
1 Scope

This Technical Specification specifies main characteristics and test methods of polyarylate fibre ropes

used for offshore station keeping.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 1968, Fibre ropes and cordage — Vocabulary

ISO 2060, Textiles — Yarn from packages — Determination of linear density (mass per unit length) by

the skein method

ISO 7500–1, Metallic materials — Verification of static uniaxial testing machines — Part 1:

Tension/compression testing machines — Verification and calibration of the force-measuring system

ISO 18692, Fibre ropes for offshore stationkeeping — Polyester
3 Terms and definitions

For the purpose of this document, the terms and definitions given in ISO 1968, ISO 18692, and the

following apply.
3.1
polyarylate
wholly aromatic polyester which shows crystallinity in liquid state
Note 1 to entry: Figure 1 shows an example of polyarylate.
o c o
m n
Figure 1 — Polyarylate chemical structure
3.2
axial compression fatigue
failure mode for fibre rope such as polyarylate under low tension or compression
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ISO/TS 19336:2015(E)
4 Materials
4.1 Rope core material

The polyarylate fibre used in the core of the rope shall have an average tenacity of not less than 1,8 N/tex

and in accordance with Annex A. Qualification and testing requirements are given in Annex A.

4.2 Rope cover material

Where polyester yarn is used in the protective cover, its minimum tenacity shall be 0,73 N/tex.

4.3 Other materials

Other materials employed in rope assembly shall be identified in the rope design/manufacturing

specification. For each material, the following shall be specified, as applicable:

a) base material;
b) size (linear density, mass per unit area, …);
c) relevant mechanical properties (tenacity, stiffness, …).
5 Requirements — Rope properties
5.1 Minimum breaking strength

The minimum breaking strength (MBS) of the rope (spliced), when tested according to Annex B, shall

conform to Table 1.
Table 1 — Minimum breaking strength (MBS)
Reference number (RN) Minimum breaking strength
80 2 500
90 3 100
100 3 900
106 4 400
112 5 000
118 5 600
125 6 300
132 7 000
140 7 800
150 8 700
160 10 000
170 11 200
180 12 500
190 14 000
200 15 500
NOTE Testing data will be prepared for validation.

The reference number corresponds to the approximate outer diameter of the rope, in

millimetres (mm). Actual diameters may vary for a given reference number.
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ISO/TS 19336:2015(E)
Table 1 (continued)
Reference number (RN) Minimum breaking strength
212 17 500
224 19 500
NOTE Testing data will be prepared for validation.

The reference number corresponds to the approximate outer diameter of the rope, in

millimetres (mm). Actual diameters may vary for a given reference number.
5.2 Minimum core tenacity

The minimum tenacity of the polyarylate rope core shall be 0,90 N/tex, measured according to Annex B.

All samples tested shall comply with the minimum value specified herein.
5.3 Axial compression fatigue properties

The rope shall have demonstrated 95 % retention of MBS following the axial compression fatigue test

method in Annex C.
5.4 Particle ingress protection

If specified, the rope shall be constructed with a protection of the core against the ingress of particles

having a size greater than 20 μm (microns) or as agreed between involved parties. Testing of the

protection shall be performed in accordance with Annex B.
5.5 Cyclic loading performance

The rope shall have demonstrated performance under cycling loading following the requirements of

7.1.7 and B.5.
6 Requirements — Rope layout and construction
6.1 General

The typical section of a rope shall comprise a rope core, providing intended strength and stiffness, and

a cover.
6.2 Type of construction
The rope shall be of one of the following types of construction:
— torque-neutral construction (type TF);
— torque-matched construction (type TM).
The type of rope shall be specified by the purchaser.

NOTE Torque-neutral ropes are intended for use in mooring systems together with chain or torque-neutral

spiral strand wire ropes. Torque-matched ropes are intended for use in mooring systems together with six-strand

wire ropes or other non-torque neutral wire ropes. Typical constructions are illustrated in Figure F.1 and Figure F.2.

6.3 Rope core

6.3.1 The total number of yarns in the rope shall be at least the number specified in the rope design

specification.
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ISO/TS 19336:2015(E)

6.3.2 Splices are not allowed in the rope core nor in sub-ropes, except for those at the end terminations.

Strands shall be uninterrupted over the length of the rope, with no splice or strand interchange.

Yarns may be joined if necessary.
6.4 Protective cover

6.4.1 A protective cover shall be provided around the rope core to protect the rope core from

mechanical damages during handling and in service.
The protection shall be water-permeable.

6.4.2 A polyester braided protective cover shall have a minimum thickness, t, with the following:

— t = 7,0 mm, for a reference number RN above 100;

— t = 0,07 × RN, but not less than 4 mm, for a reference number RN less than 100.

Strand interchanges, i.e. the overlapping continuation of an interrupted strand with another identical

strand following the same path, are permitted if they are properly staggered.

6.4.3 If an alternative protective cover is used, it shall demonstrate a level of protection equal to that of

a polyester braided cover.

6.4.4 A braided cover shall include coloured strands forming a pattern so that rope twist during

installation or in service can be identified. There shall be a minimum of one “S” coloured strand and one

“Z” coloured strand to form a cross on the rope.

An alternative protective cover shall be fitted with an axial stripe of contrasting colour, or other means

to identify rope twist during installation or in service.
6.5 Terminations

The terminations shall be made of an eye splice plus abrasion protection materials.

NOTE There can be other terminations, provided that they do not jeopardize the rope performance.

The dimensions and arrangement of the eye shall match the diameter and groove shape of the

thimble (or other interface piece) to be used for end connections and shall be the same as for the rope

prototype testing.

In the splice area, the integrity and the continuity of rope cover and particle-ingress protection, if fitted,

shall be preserved or restored.

The eye and the splice area shall be further covered by an abrasion protection coating such as

polyurethane. Each termination shall be made according to the manufacturing practice as described in

the termination specification.
6.6 Length of rope

The bedded-in lengths of the rope sections shall be calculated in accordance with 7.2.2, under 20 % of

MBS, unless otherwise agreed on the purchase order or contract.

The calculated length of supplied rope shall be within ±1 % of the specified length.

For each supplied rope, the actual length at the reeling tension or during manufacture shall be reported

as an indicative value.
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ISO/TS 19336:2015(E)

Adequate extra length shall be manufactured in order to prepare the samples for testing, which are

considered to be part of the delivery.
7 Rope testing
7.1 Type testing
7.1.1 General

Prototype tests shall demonstrate that ropes declared by the manufacturer as complying with the

requirements laid down in this Technical Specification possess the properties specified in this Technical

Specification. The purpose of these tests is to verify the design, material, and method of manufacture of

each size of finished rope, including protective cover and terminations.

All ropes to be prototype-tested shall comply with all the other requirements laid down in this Technical

Specification. The tests specified below shall be carried out on a prototype rope for each size of rope,

unless otherwise noted in this Clause.

Any change in the design, material, method of manufacture, including protective cover and terminations,

which can lead to a modification of the properties as defined in Clause 5 shall require that the prototype

tests specified in this Technical Specification be carried out on the modified rope.

7.1.2 Sampling
The number of rope samples to be tested is given in Table 2.
Table 2 — Number of samples for testing
Test Number of samples
Breaking strength, core tenacity and stiffness 3
Axial compression fatigue 1
Torque properties 1
Linear density 1
Cyclic loading endurance 1
See 7.1.4.
See 7.1.5.
See 7.1.7.
7.1.3 Breaking strength, core tenacity, and stiffness tests

7.1.3.1 Three samples shall be tested according to the procedure specified in Annex B, and each shall

be capable of meeting the requirements of 5.1 (minimum breaking strength) and of 5.2 (minimum

core tenacity).

7.1.3.2 The rope core tenacity and stiffness at end of bedding-in shall be calculated according to the

methods defined in Annex B.
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ISO/TS 19336:2015(E)

7.1.3.3 Measurement of the stiffness at other load levels shall be performed within the same tests.

These measurements are, however, not required where results are available for another qualified rope

of the same design, material and method of manufacture, with a reference number of not less than 90

and where the stiffness at end of bedding-in does not differ by more than 10 %.

NOTE 1 These measurements are performed for design purposes only. There are no acceptance criteria on

these parameters.

NOTE 2 These measurements can also be performed on a separate rope sample (see Annex B).

7.1.4 Axial compression fatigue properties test
One sample shall be tested for axial compression fatigue properties.

This test needs not to be performed when data are available from the previous qualification test of

another rope with the same design, material and method of manufacture of rope core, and a size not

less than reference number 90.
7.1.5 Torque properties tests

Where applicable, torque properties tests shall be performed according to the procedure specified in

ISO 18692. These tests are, however, not required when results are available for another qualified rope

of the same design, material, method of manufacture and termination, with a reference number of not

less than 90.
7.1.6 Linear density test

The linear density shall be calculated from the measured mass and elongation according to the method

defined in Annex B.
7.1.7 Cyclic loading (endurance) test

7.1.7.1 One sample shall be tested for cyclic loading. However, cyclic loading (endurance) tests

performed with one size of qualified rope having the same design, material and method of manufacture

including protective cover and terminations, is enough to qualify all sizes between 50 % and 200 % of

the size tested. The test for cyclic loading (endurance) is not required if such data are available.

7.1.7.2 The cyclic loading (endurance) test shall be performed according to the procedure specified in

B.5. A load range shall be selected by the manufacturer, and the rope shall withstand, without breaking,

at least the number of cycles for that load range, as given in Figure B.2.

The load at breaking (residual strength of the rope) shall be not less than 80 % of the MBS.

7.1.8 Protective cover thickness
The thickness of the protective cover shall be verified.

The thickness of a braided cover shall be measured as twice the thickness of cover strands under the

maximum braiding tension.
7.1.9 Particle ingress protection
See 5.4 and Annex B.
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ISO/TS 19336:2015(E)
7.2 Testing of current production
7.2.1 Sampling and testing

Where the ropes are already declared by the manufacturer as complying with the requirements laid

down in this Technical Specification, the rope tests, including breaking strength and core tenacity,

as well as protective cover thickness verification, shall be performed on one sample taken from the

manufacturing process for each type and size of rope.
7.2.2 Length measurement

The bedded-in length of each supplied rope section (other than short sections) shall be calculated from

the linear density, ρ , by the following Formula (1):
mm− ×1 000
L= (1)
l,20
where
L is the length of the rope, in metres (m);
m is the mass of the total rope length, in kilograms (kg);

m is the mass of the materials used to form the eyes and the splices, in kilograms (kg);

ρ is the linear density of the rope, in ktex, obtained from the prototype test, in accordance

l, 20
with 7.1.6.

The distance of short rope sections (i.e. sections of less than 20 m) shall be measured at a load of 2 % of

MBS as the distance between the centres of termination fittings (i.e. same as L on Figure B.1).

8 Report
8.1 Prototype rope

A complete and detailed report of the prototype rope manufacturing shall be supplied, including

the fibre manufacturer, the fibre type and finish and all rope characteristics that can influence the

mechanical properties, such as design, material specifications, method of manufacture, including

protective cover and terminations, with sketches or pictures.

A complete and detailed report of type tests, with sketches or pictures of the test set-up, shall also be

provided.
8.2 Current production

The manufacturing report of supplied ropes shall be provided. A complete and detailed report of rope

tests, with sketches and pictures of the test set-up, shall also be provided.
9 Certification

The certificate of approval and control, issued by a RCS (Recognized Classification Society), shall be

presented together with the ropes, in order to ensure that testing and fabrication are in accordance

with the approved specifications.

The rope manufacturer shall issue or obtain a rope certificate including at least the following information:

a) reference number;
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ISO/TS 19336:2015(E)
b) type of construction;
c) linear density;
d) MBS;
e) individual identification number;
f) length at a specified load;
g) length at the reeling handling tension.
NOTE A suggestion for a certificate of conformity can be found in Annex E.
10 Marking, labelling, and packaging
10.1 Marking

A tape of at least 3 mm wide printed with a reference identifying the manufacturer shall be incorporated

into the rope. The maximum distance between two consecutive markings shall be 0,5 m.

10.2 Labelling

An identification plaque or alternative means shall be installed close to the splice with the following

information, as a minimum:
a) purchase identification;
b) individual identification number;
c) reference to this Technical Specification, i.e. ISO/TS 19336;
d) type of construction (TF or TM), in accordance with 6.2;
e) rope MBS;
f) rope length at a specified load, according to 7.2.2.
10.3 Packaging

If the assembly is packed on a spool or a reel, these shall be suitable for the applicable transportation

means and of appropriate construction in terms of strength.

The packaging shall be marked with the manufacturer’s trademark and with the lot identification number.

NOTE The ropes can be delivered in steel reels or in containers. Alternative packaging designs can be

provided with the prior approval of the purchaser.
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ISO/TS 19336:2015(E)
Annex A
(normative)
Fibre qualification and testing
A.1 General
This Annex specifies the requirements for fibre qualification and testing.
A.2 Fibre specification
A.2.1 General information
A fibre specification shall include at least the following information:
a) identification and general properties of fibre;
b) detailed specification of physical and mechanical properties.
NOTE General properties of material can be found in the mater
...

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