Section 9 Construction
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Construction and Classification of Floating Docks and Dock Gates, July 2022 - Part 2 Rules for construction - Chapter 2 Structures – Dock Gates - Section 9 Construction

Section 9 Construction

Parent topic: Chapter 2 Structures – Dock Gates

9.1 Welding

9.1.1 Welding is to be in accordance with the requirements of Pt 2, Ch 1, 8 Welding.

9.2 Non-Destructive Examination

9.2.1 Non-Destructive Examination (NDE) is to be carried out in accordance with the requirements of the Rules for the Manufacture, Testing and Certification of Materials, July 2022.

9.2.2 All critical joints identified by the designer in the NDE plan are to be subject to volumetric and surface NDE as appropriate.

9.2.3 All butt welds in the dock gate plating in the vertical direction shall be subject to 100 per cent NDE.

9.2.4 Other butt welds subject to high in-plane tension shall be identified by the design and included in the NDE plan and subject to 100 per cent NDE.

9.2.5 Main deck and keel to dock gate sides full penetration connections, are to be subject to 100 per cent NDE.

9.2.6 Critical fillet welds subject to high stress shall be identified by the designer and included in the NDE plan and subject to 100 per cent NDE.

9.2.7 Fillet welds shall be subject to a random 10 per cent NDE of weld length agreed with the attending Surveyor.

9.3 Tolerances

9.3.1 The overall dimensions of the dock gate are to be agreed with the designer and dock Operator.

9.3.2 Tolerances for width, planer deviation and twist are to be compatible with the seal design requirements.

9.3.3 All other tolerances are to be in accordance with BS EN 1090-2 Technical requirements for the execution of steel structures.

9.3.4 For dock gates protecting nuclear vessels, there is a formal requirement on the part of the fabricator to demonstrate tolerances and record the results. The required execution class in accordance with BS EN 1990 Eurocode – Basis of structural design is:

  • EXC4 for dock gates protecting nuclear vessels.
  • EXC3 for other dock gates.
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