GB/T 20848-2026Mooring chain (English PDF)

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 supersedes GB/T 20848-2017 "Mooring Chains". Compared with GB/T 20848-2017, this document has undergone structural adjustments and editing.

Aside from the sexual alterations, the main technical changes are as follows.

a) Added requirements for R6 grade mooring chains (see 5.1 and 5.6);

b) Added requirements related to raw materials (see 5.1.2, 5.1.3);

c) Added processing quality requirements (see 5.4);

d) Increased requirements for finished product grain size testing (see 6.1);

e) The requirement to use phased array ultrasonic methods for non-destructive testing has been added (see 6.4.4);

g) The requirements for surface hardness testing have been increased (see 6.6.1);

h) The requirements for hot-rolled round steel for mooring chains have been removed (see Appendix A of the 2017 edition);

i) The requirements for non-destructive testing have been removed (see Appendix B of the 2017 edition).

1 Scope

This document specifies the classification and marking, requirements, inspection rules, marking, and packaging of mooring chains (including ordinary links and accessories), and describes the related... The corresponding test method.

This document applies to the design, manufacture, and acceptance of mooring chains and accessories used for positioning floating marine engineering structures.

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 228.1 Metallic materials - Tensile testing - Part 1: Test method at room temperature

GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method

GB/T 549 Electric Welded Anchor Chains

GB/T 6394-2017 Method for Determination of Average Grain Size of Metals

GB/T 6402 Ultrasonic Testing Methods for Steel Forgings

GB/T 11345 Ultrasonic testing techniques, testing levels and evaluation for non-destructive testing of welds

GB/T 15822 (all parts) Nondestructive testing - Magnetic particle testing

GB/T 18669 Steel for Marine Anchor Chains and Mooring Chains

3 Terms and Definitions

The terms and definitions defined in GB/T 549 and the following terms and definitions apply to this document.