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GB/T 37452-2019 PDF English

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GB/T 37452-2019: Wire rope selection methods for offshore cranes
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GB/T 37452-2019: Wire rope selection methods for offshore cranes

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NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 47.020.50 U 42 Wire Rope Selection Methods for Offshore Cranes ISSUED ON: MAY 10, 2019 IMPLEMENTED ON: DECEMBER 01, 2019 Issued by: State Administration for Market Regulation; Standardization Administration of PRC.

Table of Contents

Foreword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Terms and Definitions ... 4 4 Types of Steel Wire Rope ... 5 5 Selection Requirements ... 5 6 Selection Method ... 6 Wire Rope Selection Methods for Offshore Cranes

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; ηrs – reeving system efficiency, see 6.4 for the calculation method. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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