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GB/T 47731-2026Ships and marine technology - Combined rigging for deep-sea mooring (English PDF)

船舶与海洋技术深海系泊用组合索具

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Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

May 25, 2026

Implementation date

September 1, 2026

Scope

GB/T 47731-2026 is the English-translated version of 船舶与海洋技术深海系泊用组合索具.

GB/T 47731-2026 is a Chinese national standard on combined rigging for deep-sea mooring. It is equivalent to ISO 4845:2023. The standard specifies the types, dimensions, testing and other technical requirements for deep-sea mooring rigging.

The combined rigging it covers is used for the mooring and positioning of offshore structures in water depths of 1000 m to 5000 m.

Its clauses on design include the structural types of combined rigging, and ISO 18692-3 is listed as a normative reference, and the design clause is the main technical part of the document after the scope, references and terms. Issued on 25 May 2026 and applicable from 1 September 2026.

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Document preview — GB/T 47731-2026

National Standard of the People's Republic of China

ICS: 47.020.50
Classification: U 21

Issued by: State Administration for Market Regulation

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 Design

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

This document is equivalent to ISO 4845:2023 "Marine and marine technology - Combined rigging for deep-sea mooring".

1 Scope

This document specifies the types, dimensions, testing, and other technical requirements for deep-sea mooring rigging (hereinafter referred to as "rigging").

A combination rigging used for mooring and positioning of offshore structures in water depths of 1000m to 5000m.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

ISO 18692-3 Fiber ropes for mooring and positioning of offshore platforms - Part 3: High modulus polyethylene (HMPE) mooringchains

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined.

4 Design

4.1 Structural Types of Combined Rigging

The combined rigging consists of fiber ropes, mooring chains, and shackles, as shown in Figure 1. Indexing instructions.

L1 --- Length of the mooring chain at the outlet end connected to the anchor winch;

L2 --- The length of the intermediate fiber rope in the composite rigging;

L3 --- The length of the end of the mooring chain connected to the anchor;

1 --- Shackle;

2 --- Mooring chain;

3 --- Fiber rope;

4 --- Ring.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 9 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 18692-3

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