ISO 4344:2022

INTERNATIONAL ISO
STANDARD 4344
Third edition
2022-12
Steel wire ropes for lifts — Minimum
requirements
Câbles en acier pour ascenseur — Exigences minimales
Reference number
© ISO 2022
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Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Material . 2
4.1.1 Wire. 2
4.1.2 Core . 2
4.1.3 Lubricant . 3
4.2 Rope manufacture . 3
4.2.1 General . 3
4.2.2 Wire joints . 4
4.2.3 Fibre core joints . 4
4.2.4 Lubrication . 4
4.2.5 Preformation and postformation . 4
4.2.6 Prestretching load limit . 4
4.2.7 Rope ends . 4
4.2.8 Rope construction . 4
4.2.9 Rope grade . 5
4.2.10 Type and direction of lay . 5
4.2.11 Lay length . 6
4.3 Designation and classification . 6
4.4 Dimensions . 6
4.4.1 Diameter . 6
4.4.2 Length . 7
4.5 Minimum breaking force . 7
4.6 Wire tensile strength . 8
4.7 Rope stretch . 8
5 Verification of requirements and test methods . 8
5.1 Materials . 8
5.2 Test on rope for diameter . . 8
5.2.1 Equipment . 8
5.2.2 Measured diameter . 8
5.2.3 Ovality . 9
5.2.4 Variation . 9
5.3 Test on rope for breaking force. 9
5.4 Test on rope for lubricant content . 9
5.5 Test on rope for wire tensile strength . 9
5.6 Additional test . . 9
6 Sampling and acceptance criteria .9
7 Information for use .9
7.1 Certificate . 9
7.1.1 General . 9
7.1.2 Test results . 10
7.2 Information for selection, installation, maintenance . 10
7.3 Discard criteria . 10
7.4 Marking . 10
7.5 Information recommended to be provided for an enquiry or an order . 10
Annex A (normative) Determination of lubricant content: gravimetric method.11
iii
Annex B (normative) Tables of minimum breaking force values for the more common
classes, diameters and grade of ropes .14
Annex C (normative) Calculation of minimum breaking force .26
Annex D (informative) Calculation of approximate rope length mass, nominal metallic
cross-sectional area and approximate outer wire size .27
Annex E (informative) Determination of construction stretch and elastic stretch .28
Annex F (informative) Information for selection, storage, transportation, installation and
maintenance for lift ropes .30
Annex G (normative) Discard criteria for lift ropes .32
Annex H (informative) Information recommended to be provided with an enquiry or order .34
Bibliography .35
iv
Foreword
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This document was prepared by Technical Committee ISO/TC 105, Steel wire ropes.
This third edition cancels and replaces the second edition (ISO 4344:2004), which has been technically
revised.
The main changes are as follows:
— added more rope grades commonly used in lifts and deleted rope grades rarely used in lifts;
— added more rope constructions commonly used in lifts;
— revised the requirement of lubricant content for rope cores;
— added the requirement of lubricant content for strands;
— revised diameter tolerances of steel
...