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C: Material Selection [Table of Contents] Sec.3: Design Principles

DNV-OS-C105 Structural Design of TLPS (LRFD method)

[-] Sec.2: Structural Categorisation, Material Selection and Inspection Principles
[-] D: Fabrication Inspection Categories

Sec.2
D. Fabrication Inspection Categories

Sec.2
D 100   General

Sec.2 D
101   Welding and the extent of non-destructive testing (NDT) during fabrication, shall in general be in accordance with the requirements stipulated for the appropriate inspection category as defined in DNV-OS-C101 Sec.4.

Sec.2 D
102   Inspection categories determined in accordance with DNV-OS-C101 provide requirements for the minimum extent of required inspection. When considering the consequences during in-service operation, it may be necessary to specify more demanding inspection requirements than the required minimum. Examples are in way of complex connections with limited or difficult access, or special material/process without proven characteristics.

Sec.2 D
103   When determining the extent of inspection and the locations of required NDT, in addition to evaluating design parameters (for example fatigue utilisation), consideration should be given to relevant fabrication parameters including:
—location of block (section) joints
—manual versus automatic welding
—start and stop of weld etc.
—materials and criticality of location
—types of NDT used
—first time welds or repair welds.


Sec.2 D
104   The Figure 1 and Figure 2 shows examples of structural categorisation and inspection category (IC).

Sec.2 D
105   Inspection of composite components is described in DNV-OS-C501 Sec.12 B. Quality aspects regarding fabrication are described in DNV-OS-C501 Sec.11.
C: Material Selection [Table of Contents] Sec.3: Design Principles