OS-C501

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Offshore Standard DNV-OS-C501, November 2013 App.A Check-lists for design input – Page 208 APPENDIX A CHECK-LISTS FOR DESIGN INPUT A.1 Phases Table A-1 Minimum list of phases Manufacturing Fabrication / Assembly Transport Handling Construction Storage Installation Testing Commissioning Operation Maintenance Operation Repair Retrieval / recirculation Post-operation A.2 Functional requirements and failure modes A.2.1 Functional requirements that shall be checked as a minimum Table A-2 Minimum list of Functional Requirements Minimum list of Functional Requirements Load carrying capacity Pressure containment Tightness/Fluid containment Dimensional stability Environmental, chemical and UV resistance Maximum vibrations Fire Resistance Temperature insulation Erosion, abrasion, wear Electrical Resistance or Insulation Static Electricity / Grounding Lightning resistance A.2.2 Failure modes that shall be checked as a minimum Table A-3 Minimum list of Failure Modes Minimum list of Failure Modes Fracture (local or global) Burst Leakage Impact Excessive deformation Ovalisation Excessive displacement Wear DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 App.A Check-lists for design input – Page 209 A.2.3 Link between functional requirements and failure modes Table A-4 Link between functional requirements and failure modes Functional Requirements Failure Modes Comments Load carrying capacity Fracture Shall always be checked Global, local buckling Shall always be checked if compressive loads are present. Buckling may lead to fracture. Blast Same as fracture, caused by high rate external loads. Impact Damage from impact may effect load carrying capacity Excessive deformation, ovalisation excessive displacement Wear Only relevant if deformations effect load carrying capacity, e.g. if the structure can jump out of a mechanical joint. Wear may lead to a reduction of strength, causing fracture. Pressure containment Fracture, local fracture Shall always be checked. Global, local buckling Shall always be checked if compressive loads are present. Buckling may lead to fracture or excessive deformations. Blast Same as fracture, caused by high rate external loads. Burst Same as fracture, but combined with rapid release of fluid from a pressure vessel. Failure consequence is usually related to high safety class. Impact Damage from impact may effect load carrying capacity Excessive deformation, ovalisation Excessive displacement Only relevant if deformations effect load carrying capacity, e.g. if the structure can jump out of a mechanical joint or a seal. Leakage Related to fracture, but often just a gradual release of fluid from a pressure vessel. Fracture will cause leakage, but other minor failure mechanisms may also cause leakage. Failure consequence is often less critical and related to normal safety class, but it depends on the fluid. Wear Wear may lead to a reduction of strength, causing fracture. Tightness/Fluid containment Same as pressure containment Dimensional stability Excessive deformation, ovalisation. Excessive displacement Wear Wear may lead to a change of acceptable dimensions. Environmental resistance, Resistance to chemicals UV Resistance Maximum vibrations Fire Resistance Temperature insulation Erosion, abrasion, wear Electrical Resistance or Insulation Static Electricity / Grounding Lightning resistance Linked to all other functional requirements Part of general structural analysis. Linked to all other functional requirements. Not covered in this standard Wear Not covered in this standard Not covered in this standard Not covered in this standard Resistance to the environment or chemicals is treated in this standard as a possible change to material properties that shall be considered in the evaluation of all other functional requirements. Resistance to fire is mainly treated in this standard as a possible change to material properties that shall be considered in the evaluation of all other functional requirements. Insulation can be tested and analysed the same way as for other materials. Anisotropic thermal coefficients and thermal expansions should be considered. Electrical aspects are not covered in this standard. Composites are an insulator, unless filled with conductive particles or fibres. Coating with a fluid or paint may also create some conductivity. Special electrical requirements for the application shall be considered. DET NORSKE VERITAS AS
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OS-C501

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