OS-C501

Offshore Standard DNV-OS-C501, November 2013
CHANGES – CURRENT – Page 3
CHANGES – CURRENT
General
This document supersedes DNV-OS-C501, October 2010.
Text affected by the main changes in this edition is highlighted in red colour. However, if the changes involve
a whole chapter, section or sub-section, normally only the title will be in red colour.
Main changes November 2013
• General
— A new approach to the specification of characteristic strength has been introduced The new approach will
result in a more consistent reliability level less dependent on application and availability of information in
the form of test results.
— The new approach will result in less conservative designs in some frequent applications. This may save
cost, weight etc.
The structure of this document has been converted to decimal numbering. Older references to this document
may normally be interpreted by analogy to this example:
— “DNV-OSS-101” Ch.2 Sec.3 D506 is now “DNV-OSS-101 Ch.2 Sec.3 [4.5.6].”
• Sec.1 General
— [2.1.4]: Text has been updated to reflect the new approach. A guidance note has been added.
• Sec.2 Design philosophy and design principles
— [3.3.2] Definition of safety classes have been clarified.
• Sec.4 Materials - laminates
— [2.4] Characteristic strength
The section has been restructured as follows:
— Deleted: Characteristic values shall be established with 95% confidence.
— Table 4-3, Table 4-4 and Table 4-5 replace the previous Table B2 for derivation of factor k m .
— [3.2.9], [3.3.8], [3.5.8], [5.1.10] and [5.8] have been amended.
— Table 4-8 has been amended.
• Sec.5 Materials - sandwich structures
— Table 5-1 Has been amended.
— [1.2.3] and [1.2.4]: Text have been added.
• Sec.6 Failure mechanisms and design criteria
— [3.1.5] and [3.1.7]: Text have been clarified.
— [18]: Text has been added.
• Sec.7 Joints and interfaces
— Table 7-1 has been amended.
• Sec.10 Component testing
— [2.2.2], [2.3.2] and [3.3.5] have been amended.
• Sec. 12 Operation, maintenance, reassessment, repair
— [2.2.3] has been amended.
• Sec.14 Calculation example: Two pressure vessels
— [5.2.1]: Formulas has been amended.
• App.F Example for representative data: Glass reinforced polyester laminate
— Table F-8: Note has been added.
• App.G Example for representative data: Unidirectional carbon tape AS4 12K
— Table G-3 has been amended.
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