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GB/T 40502-2021Technical requirements for active draghead (English PDF)

主动耙头技术要求

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 20, 2021

Implementation date

March 1, 2022

Scope

GB/T 40502-2021 is the English-translated version of 主动耙头技术要求.

GB/T 40502-2021 covers the active draghead, the digging device fitted to the end of the rake arm of a trailing suction dredger, whose movable visor can be set at an adjustable angle to the fixed body in real time.

It sets out the structure of the draghead, its technical requirements and the methods used to verify them, with normative annexes on the hydraulic test of the water tank and water chamber, the hoisting test and the rotation test of the movable visor.

Its definitions cover the draghead, the fixed body, the visor and the active draghead itself. It applies to the design, manufacture, inspection and use of active dragheads, and can be used as a reference for non-active ones. It was issued on 20 August 2021 and has applied since 1 March 2022.

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Document preview — GB/T 40502-2021

National Standard of the People's Republic of China

ICS: 47.020.50
Classification: U 34

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Structure
5 Technical requirements
6 Test method
Appendix A (Normative Appendix) Water Tank and Water Chamber Hydraulic Test
Appendix B (Normative Appendix) Active drag head hoisting test
Appendix C (Normative Appendix) Movable Cover Rotation Test
Reference

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the structure, technical requirements and verification methods of the active drag head of a trailing suction dredger.

This standard applies to the design, manufacture, inspection and use of active drag heads of trailing suction dredgers, and the design, manufacture, inspection and use of non-active drag heads. Use can refer to use.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 1800.1-2020 Product Geometric Technical Specification (GPS) Linear Dimension Tolerance ISO Code System Part 1: Tolerance, Basis for deviation and fit

GB/T 1800.2-2020 Product Geometric Technical Specification (GPS) Linear Dimension Tolerance ISO Code System Part 2: Standard Tolerance zone code and limit deviation table of hole and shaft

GB/T 8923.1-2011 Visual assessment of surface cleanliness of steel surface treatment before coating-Part 1: Uncoated The corrosion level and treatment level of the steel surface and the steel surface after the original coating has been completely removed

GB/T 11345-2013 Ultrasonic testing technology, testing level and assessment for non-destructive testing of welds

GB/T 13342 General technical conditions for marine reciprocating hydraulic cylinders

GB/T 19418-2003 Guide for the quality classification of arc welded joint defects of steel

GB/T 19804 General dimensional tolerances and geometric tolerances of welded structures

GB/T 34677 Anticorrosive coating for underwater production system

CB/T 4231 Technical requirements for ship coating

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Draghead

It is a digging device installed on the front end of the rake arm of a trailing suction dredger, which is composed of a fixed part, a movable part, a suction cavity and a rake tooth.

3.2 Fixed body

The drag head component connected with the rake arm flange of the trailing suction dredger.

3.3 Visor

The drag head component is hinged to the fixed body and can rotate within a certain angle range relative to the fixed body.

3.4 Active draghead

The relative angle of the movable cover of the drag head and the fixed body can be adjusted in real time.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

CB/T 4231

Similar standards

GB/T 14087-2026|GB/T 14358-2026|GB/T 20848-2026|GB/T 25014-2026|GB/T 26086-2026|GB/T 30487-2026

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