Section 7 Welding and fabrication
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, July 2022 - Part 3 Functional Unit Types and Special Features - Chapter 12 Riser Systems - Section 7 Welding and fabrication

Section 7 Welding and fabrication

Parent topic: Chapter 12 Riser Systems

7.1 General

7.1.1 Welding, weld procedures and approval of welders are to be in accordance with the general requirements of Pt 4, Ch 8 Welding and Structural Details. When agreed with LR, the fabrication of riser systems may be in accordance with a recognised Code or Standard, see Pt 12, Ch 1 Recognised Codes and Standards.

7.1.2 The proposals for NDE procedures are to be agreed with LR prior to the commencement of construction.

7.1.3 All butt welds are to be subjected to 100 per cent NDE. Examination by radiography is to be to a Standard acceptable to LR, e.g., ISO 17636: Non-destructive testing of welds – Radiographic testing of fusion welded joints, with acceptance criteria as detailed in the Construction Code, or BS 4515: Specification for welding of steel pipelines on land and offshore, if not specified in the Code. Proposals for examination by ultrasonics are to be submitted for review and acceptance.

7.1.4 All defective sections of welds are to be cut out, carefully re-welded and re-examined.

7.1.5 Weld procedures for repairs and alterations are to be qualified and approved by LR.

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