GB/T 37452-2019 English PDF (GBT37452-2019)

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