This document supersedes the October edition of DNV-RP-F The purpose of the revision of this service document is to comply with the new DNV GL. If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall. DNV-RP-F DESIGN OF DUPLEX STAINLESS STEEL SUBSEA EQUIPMENT EXPOSED TO CATHODIC PROTECTION.
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Proceedings of an international conference Diverless and Deepwater Techology: As subsea facilities are protected from seawater corrosion by cathodic protection CPS DSS components are exposed to hydrogen uptake, especially when a coating system is not in place or has failed at a certain location.
Log in to your subscription Username. Publishers Content Coverage Privacy. Instead, the industry assumes that hydrogen charging will happen and relies instead on design approaches that avoid equipment being exposed to stresses or strains exceeding the nominal thresholds for HISC.
DNVGL-RP-F Duplex stainless steel – design against hydrogen induced stress cracking – DNV GL
Ferritic-austenitic duplex stainless steels DSS are often used to manufacture subsea components for their high strength associated with a good corrosion f112. Ferritic-austenitic duplex and superduplex stainless steels DSSs and SDSSs are an attractive option for subsea equipment and connecting spools, in which the internal corrosion threats can be difficult to manage, using corrosion inhibition and in-line inspection.
This CP results in hydrogen charging of the duplex stainless steel, either at uncoated rl or, in locations where the coating has lost integrity. A comprehensive test program is described quantifying the HISC performance of dnc superduplex stainless steel subsea components and, comparing the actual performance against the limits derived following DNV RP F Typical uses are short flowlines, welded hubs and flanges, manifolds, towheads, flowbases, sensors and valves.
Rock Mechanics Symposium and 5th Dbv.
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Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. Proceedings of an international conference Oceanology: Whilst mitigations such as increased less negative CP potential, tailored microstructure and high-reliability coatings can be considered, these are challenging and are rarely a complete barrier to the threat.
To facilitate this comparison, comprehensive material characterization, small, intermediate and full scale environmental-mechanical testing, and finite element analyses were conducted. Full scale test validation of this approach is limited. Peer reviewed only Published between: Advanced search Show search help.
ABSTRACT Ferritic-austenitic duplex and superduplex stainless steels DSSs and SDSSs are an attractive option for subsea equipment and connecting spools, in which the internal corrosion threats can be difficult to manage, using corrosion inhibition and in-line inspection.
However, whilst these materials are advantageous for fp internal corrosion, they still require external cathodic protection CP to prevent localized corrosion in seawater at typical operating temperatures.