GB/T 37452-2019Wire rope selection methods for offshore cranes (English PDF)
海洋平台起重机钢丝绳选型方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 10, 2019
Implementation date
December 1, 2019
Scope
GB/T 37452-2019 is the English-translated version of 海洋平台起重机钢丝绳选型方法.
GB/T 37452-2019 is the Chinese national standard for selecting the wire rope of an offshore crane.
It gives the terms and definitions, the types of steel wire rope, the selection requirements - the duty of the mechanism, the load and bending conditions, corrosion, the rope construction, grade and lubrication - and the selection method itself, with the calculation that leads from the load to a rope diameter and class.
It applies to the hoisting mechanism and the luffing mechanism of an offshore crane, for both running and standing rigging. Crane makers, platform operators and the surveyors who accept the rigging use it. Issued on 10 May 2019, it has applied since 1 December 2019.
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Document preview — GB/T 37452-2019
National Standard of the People's Republic of China
- ICS
- 47.020.50
- Classification
- U 42
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative References4
- 3 Terms and Definitions4
- 4 Types of Steel Wire Rope5
- 5 Selection Requirements5
- 6 Selection Method6
1 Scope
This Standard specifies the types, selection requirements and selection methods of the wire ropes for the offshore cranes.
This Standard is applicable to the hoisting mechanism and luffing mechanism of the offshore crane (amplitude-variable wire rope running rigging and standing rigging).
2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.
GB/T 20118-2017 Steel Wire Rope for General Purpose
ISO 4306-1 Cranes - Vocabulary - Part 1: General API Spec 9A Specification for Wire Rope
3 Terms and Definitions
For the purpose of this document, the terms and definitions given in ISO 4306-1 and the following apply.
3.1 Safety working load; SWL
Under the given working conditions, the maximum rated load within the rated capacity of the crane.
3.2 Safe working load hook; SWLH
The weight of safe working load plus hook and load tackle.
3.3 Standing rigging
A fixed steel wire rope for support. opposite to the rotation direction of the roll.
The galvanized layer on the surface of the steel wire rope shall be no less than the Grade-AB galvanized layer specified in GB/T 20118-2017.
5.5 Nominal breaking force of the steel wire rope
When selecting the nominal breaking force of the steel wire rope, the following factors shall be considered:
a) Structure of the steel wire rope (see GB/T 20118-2017 or the data provided by the manufacturer of the steel wire rope);
b) Nominal tensile strength of the steel wires in the rope (see GB/T 20118-2017 or the data provided by the manufacturer of the steel wire rope).
6 Selection Method
6.1 General
The nominal breaking force of the steel wire rope and the corresponding nominal diameter d shall be selected as per the minimum breaking force of the steel wire rope.
The minimum breaking force of the steel wire rope depends on the steel wire rope load, reeving pulley block rate, reeving system efficiency and minimum design factor.
6.2 Calculation of minimum breaking force of the steel wire rope
6.2.1 The minimum breaking force of the steel wire rope shall be calculated as per the Formula (1): Where:
BL - minimum breaking force of single piece of steel wire rope, in kN;
W - steel wire rope load, in kN; see 6.2.2 for the calculation method;
DF - minimum design factor, see 6.3 for the calculation method; N - reeving pulley block rate;
thetars - reeving system efficiency, see 6.4 for the calculation method.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 19 pages — is available in the English PDF.
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