OS-C501

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Offshore Standard DNV-OS-C501, November 2013 Contents – Page 12 6.1 ...................................................................................................................................................... 173 7 Safety, health and environment ........................................................................................................... 173 7.1 ...................................................................................................................................................... 173 Sec. 12 Operation, maintenance, reassessment, repair ............................................................ 174 1 General ................................................................................................................................................... 174 1.1 Objective...................................................................................................................................... 174 2 Inspection ............................................................................................................................................... 174 2.1 General......................................................................................................................................... 174 2.2 Inspection methods ...................................................................................................................... 174 3 Reassessment.......................................................................................................................................... 174 3.1 General......................................................................................................................................... 174 4 Repair ..................................................................................................................................................... 175 4.1 Repair procedure.......................................................................................................................... 175 4.2 Requirements for a repair............................................................................................................. 175 4.3 Qualification of a repair............................................................................................................... 175 5 Maintenance........................................................................................................................................... 175 5.1 General......................................................................................................................................... 175 6 Retirement.............................................................................................................................................. 175 6.1 General......................................................................................................................................... 175 Sec. 13 Definitions, abbreviations & figures ............................................................................. 176 1 Definitions .............................................................................................................................................. 176 1.1 General......................................................................................................................................... 176 1.2 Terms ........................................................................................................................................... 176 2 Symbols and abbreviations................................................................................................................... 179 3 Figures.................................................................................................................................................... 181 3.1 Ply and laminate co-ordinate systems.......................................................................................... 181 3.2 Sandwich co-ordinate system and symbols ................................................................................. 181 Sec. 14 Calculation example: two pressure vessels................................................................... 183 1 Objective ................................................................................................................................................ 183 1.1 General......................................................................................................................................... 183 2 Design input ........................................................................................................................................... 183 2.1 Overview...................................................................................................................................... 183 2.2 General function (ref. Sec.3 [2.1])............................................................................................... 183 2.3 Product specifications (ref. Sec.3 [2]).......................................................................................... 183 2.4 Division of the product into components (ref. Sec.3 [3]) ............................................................ 184 2.5 Phases and safety class definitions (ref. Sec.3 [4] and [5]) ......................................................... 184 2.6 Functional requirements (ref. Sec.3 [6])...................................................................................... 185 2.7 Failure modes (ref. Sec.3 [7]) ...................................................................................................... 186 2.8 Loads (ref. Sec.3 [9]) ................................................................................................................... 186 2.9 Environment (ref. Sec.3 [10]) ...................................................................................................... 187 3 Failure mechanisms............................................................................................................................... 187 3.1 Identification of failure mechanisms (ref. Sec.6 [1])................................................................... 187 3.2 Classification of failure mechanisms by failure types (ref. Sec.6 [1])......................................... 189 3.3 Failure mechanisms and target reliabilities (ref. Sec.2 [3.5])...................................................... 189 4 Material properties ............................................................................................................................... 190 4.1 General (ref. Sec.4)...................................................................................................................... 190 4.2 Ply modulus in fibre direction E 1 ................................................................................................ 191 4.3 Matrix dominated elastic properties............................................................................................. 191 4.4 Fibre dominated ply strength and strain to failure....................................................................... 192 4.5 Matrix dominated ply strength and strain to failure..................................................................... 193 4.6 Time to failure for fibre dominated properties ............................................................................ 193 4.7 Time to failure for matrix dominated properties.......................................................................... 193 4.8 Test requirements......................................................................................................................... 193 5 Analysis of gas vessel with liner ........................................................................................................... 194 5.1 General......................................................................................................................................... 194 5.2 Analysis procedure (ref. Sec.9).................................................................................................... 194 5.3 Fibre failure - short-term (ref. Sec.6 [3]) ..................................................................................... 195 5.4 Fibre dominated ply failure due to static long-term loads (ref. Sec.6 [10])................................. 196 5.5 Fibre dominated ply failure due to cyclic fatigue loads (ref. Sec.6 [11]) .................................... 197 5.6 Matrix cracking (ref. Sec.6 [4]) ................................................................................................... 198 5.7 Unacceptably large displacement (ref. Sec.6 [9])........................................................................ 198 DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 Contents – Page 13 5.8 Impact resistance (ref. Sec.6 [12]) ............................................................................................... 198 5.9 Explosive decompression (ref. Sec.6 [15]).................................................................................. 199 5.10 Chemical decomposition (ref. Sec.6 [17]) ................................................................................... 199 5.11 Summary evaluation .................................................................................................................... 199 6 Non-linear analysis of vessel for water without liner......................................................................... 199 6.1 General......................................................................................................................................... 199 6.2 Analysis procedure (ref. Sec.9 [2]).............................................................................................. 199 6.3 Matrix cracking (short term) at 1.48 MPa pressure (ref. Sec.6 [4])............................................. 201 6.4 Matrix cracking under long-term static loads (ref. Sec.4 [3.4])................................................... 201 6.5 Matrix cracking under long-term cyclic fatigue loads (ref. Sec.4 [3.9]) ..................................... 202 6.6 Fibre failure - short term (ref. Sec.6 [3]) ..................................................................................... 202 6.7 Fibre dominated ply failure due to static long term loads (ref. Sec.6 [10])................................. 202 6.8 Fibre dominated ply failure due to cyclic fatigue loads (ref. Sec.6 [11]) .................................... 203 6.9 Unacceptably large displacement (ref. Sec.6 [9])........................................................................ 203 6.10 Impact resistance (ref. Sec.6 [12]) ............................................................................................... 203 6.11 Explosive decompression (ref. Sec.6 [15]).................................................................................. 203 6.12 Chemical decomposition (ref. Sec.6 [17]) ................................................................................... 203 6.13 Component testing (ref. Sec.10) .................................................................................................. 203 6.14 Summary evaluation .................................................................................................................... 204 7 Linear analysis of vessel for water without liner................................................................................ 204 7.1 General......................................................................................................................................... 204 7.2 Analysis procedure (ref. Sec.9 [2]).............................................................................................. 204 7.3 Matrix cracking (short term) (ref. Sec.6 [4]) ............................................................................... 205 7.4 Matrix cracking under long-term static loads (ref. Sec.4 [3.4])................................................... 205 7.5 Matrix cracking under long-term cyclic fatigue loads (ref. Sec.4 [3.9]) ..................................... 205 7.6 Fibre failure – short-term (ref. Sec.6 [3]) .................................................................................... 205 7.7 Fibre dominated ply failure due to static long-term loads (ref. Sec.6 [10])................................. 207 7.8 Fibre dominated ply failure due to cyclic fatigue loads (ref. Sec.6 [11]) .................................... 207 7.9 Unacceptably large displacement ................................................................................................ 207 7.10 Impact resistance.......................................................................................................................... 207 7.11 Explosive decompression............................................................................................................. 207 7.12 Chemical decomposition.............................................................................................................. 207 7.13 Summary evaluation .................................................................................................................... 207 App. A Check-lists for design input .......................................................................................... 208 A.1 Phases..................................................................................................................................................... 208 A.2 Functional requirements and failure modes ........................................................................................... 208 A.3 Loads ...................................................................................................................................................... 210 A.4 Environments ......................................................................................................................................... 211 A.5 Distribution types of basic variables ...................................................................................................... 211 App. B Lay-up and laminate specification ................................................................................ 213 B.1 Unique definition of a laminate.............................................................................................................. 213 App. C Test methods for laminates ............................................................................................ 215 C.1 General ................................................................................................................................................... 215 C.2 Static tests for laminates......................................................................................................................... 215 C.3 Tests to obtain properties under long term static and cyclic loads......................................................... 217 C.4 Tests to obtain the fibre fraction ............................................................................................................ 217 C.5 Tests on tubular specimens .................................................................................................................... 218 C.6 Evaluation of stress versus strain curves................................................................................................ 218 App. D Test methods for sandwich materials............................................................................ 220 D.1 General ................................................................................................................................................... 220 D.2 Core materials - static tests..................................................................................................................... 220 D.3 Adhesive materials - static tests ............................................................................................................. 222 D.4 Core skin interface properties ................................................................................................................ 222 D.5 Tests for other properties........................................................................................................................ 223 App. E Tables of safety factors................................................................................................... 225 E.1 Partial safety factors............................................................................................................................... 225 App. F Example for representative data - Glass reinforced polyester laminate.............................................................................. 230 F.1 General ................................................................................................................................................... 230 F.2 Definition of material............................................................................................................................. 230 F.3 Quasi static properties in air (QSA) ....................................................................................................... 231 F.4 Long term properties in air..................................................................................................................... 234 F.5 Long term properties in water ................................................................................................................ 239 App. G Example for representative data – Unidirectional carbon tape AS4 12k ............................................................................. 240 DET NORSKE VERITAS AS
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OS-C501

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