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GB/T 47047-2026Marine structures - Mobile offshore units - Chain wheels (English PDF)

海上结构物海上移动平台锚链轮

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Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

January 28, 2026

Implementation date

August 1, 2026

Scope

GB/T 47047-2026 is the English-translated version of 海上结构物海上移动平台锚链轮.

GB/T 47047-2026 is a Chinese national standard for chain wheels used on mobile offshore units. It is equivalent to ISO 21711:2019. The document specifies the tooth profile, dimensions, tolerances, materials and inspection requirements for anchor chain wheels.

The chain wheels apply to offshore mooring chain as defined in ISO 20438. The Chinese edition adds the mooring chain grade R6 as an example. Its terms include pitch diameter, together with a second diameter used to calculate the linear speed of the anchor chain during dynamic anchoring.

It refers to GB/T 39428-2020, ISO 6506-1, ISO 8062-3 and ISO 16859-1. Issued on 28 January 2026 and applicable from 1 August 2026.

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Document preview — GB/T 47047-2026

National Standard of the People's Republic of China

ICS: 47.020.50
Classification: U 47

Issued by: State Administration for Market Regulation

Foreword
1 Scope
2 Normative references
3 Terms and Definitions

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 21711:2019 "Offshore structures, offshore mobile platforms, anchor chains".

The following minimal editorial changes have been made to this document.

---Added the ocean mooring chain class R6 as an example (see 5.2.1).

1 Scope

This document specifies the tooth profile, dimensions, tolerances, materials, and inspection requirements for anchor sprockets.

The anchor chain wheel specified in this document applies to marine mooring chains as defined in ISO 20438.

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.

GB/T 39428-2020 Visual inspection method for surface quality of sand-cast steel parts (ISO 11971:2020, MOD)

Note: There are no technical differences between the content referenced in GB/T 39428-2020 and the content referenced in ISO 11971:2020.

Note: GB/T 3893-2008 Shipbuilding and Offshore Structures Deck Machinery Terminology and Symbols (ISO /FDIS3828.2007, IDT)

ISO 6506-1 Metallic materials - Brinell hardness test - Part 1: Test methods hardnesstest-Part 1: Testmethod)

Note: GB/T 231.1-2018 Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1:2014, MOD)

ISO 8062-3 Product Geometry Specification (GPS) - Dimensions and geometric tolerances of molded parts - Part 3: General tolerances for castings

Note: GB/T 42124.3-2025 Dimensional tolerances, geometric tolerances and machining allowances for castings (ISO 8062-3:2023, MOD)

ISO 16859-1 Metallic materials - Leeb hardness test - Part 1: Test methods test-Part 1: Testmethod)

3 Terms and Definitions

The terms and definitions defined in ISO 3828 and the following terms and definitions apply to this document.

3.1 Pitch diameter

The diameter of the circumcircle of the non-regular polygon formed by the centerline of the anchor chain at the point where the anchor chain engages with the anchor chain wheel.

Note: Pitch diameter is used to calculate the maximum torque when the anchor chain is in operation.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 18 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 39428-2020Visual inspection method for surface quality of sand casting steel parts

ISO 6506-1 · ISO 8062-3 · ISO 16859-1

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