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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Ferritic-austenitic duplex and superduplex r112 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 managing internal corrosion, they still require external cathodic protection CP to prevent localized corrosion in seawater at typical operating temperatures.
This CP results in hydrogen charging of the duplex stainless steel, either at uncoated locations or, in locations where the coating has lost integrity. In the presence of a critical hydrogen concentration, all duplex and super duplex stainless steels are susceptible to hydrogen embrittlement, via a cracking mechanism commonly referred to as HISC: 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.
Hydrogen Induced Stress Cracking (1 Day) – DNV GL
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.
Full scale test validation of this approach is limited. A comprehensive test program is described quantifying the HISC performance of retrieved superduplex stainless steel subsea components and, comparing the actual performance against the limits derived following DNV RP F To facilitate this comparison, comprehensive material characterization, small, intermediate and full scale environmental-mechanical testing, and finite element analyses were dhv.
Ferritic-austenitic duplex stainless steels DSS are often used to manufacture subsea components for their high strength associated with a good corrosion resistance.
Typical uses are short flowlines, welded hubs and flanges, manifolds, towheads, flowbases, sensors and valves.
As subsea facilities are protected from seawater corrosion dng 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. Peer reviewed only Published between: Advanced search Show search help.
Rock Mechanics Symposium and 5th U. Proceedings of an international conference Diverless and Deepwater Techology: Proceedings of an international conference Oceanology: Proceedings of an International Conference Submersible Technology: Proceedings of an international conference Subsea Controls and Data Acquisition ‘ 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 1f12 manage, using corrosion inhibition and in-line inspection.
Hydrogen induced stress cracking using DNV-RP-F – SDEA Solutions