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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Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. 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.
Proceedings of an international conference Subsea Controls and Data Acquisition ‘ 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.
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 Rock Mechanics Symposium and 5th U.
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.
Log in to your subscription Username. Proceedings of an International Conference Submersible Technology: Proceedings of an international conference Diverless and Deepwater Techology: Typical uses are short flowlines, welded hubs and flanges, manifolds, towheads, flowbases, sensors and valves.
Full scale test validation of this approach is limited. 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.
Hydrogen Induced Stress Cracking (1 Day) – DNV GL
Instead, the industry assumes that hydrogen charging will happen and relies instead on design approaches that env equipment being exposed to stresses or strains exceeding the nominal thresholds for HISC.
This CP results in hydrogen charging of the duplex stainless steel, either at uncoated locations or, in locations where the coating has lost integrity.
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.
Publishers Content Coverage Privacy. Ferritic-austenitic duplex stainless steels DSS are often used to manufacture subsea components for their high strength associated with a good corrosion resistance.
DNVGL-RP-F Duplex stainless steel – design against hydrogen induced stress cracking – DNV GL
Advanced search Show search help. Peer reviewed only Published between: To facilitate this comparison, comprehensive material characterization, small, intermediate and full scale environmental-mechanical testing, and finite element analyses were conducted. In the presence rpp 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: