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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Hydrogen Induced Stress Cracking (1 Day) – DNV GL
Ferritic-austenitic duplex stainless steels DSS are often used to manufacture subsea components for their high strength associated with a good corrosion resistance. Log in to your subscription Username. Proceedings of an international conference Diverless and Deepwater Techology: 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 ddnv 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: 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 using DNV-RP-F – SDEA Solutions
Rock Mechanics Symposium fp 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.
Ferritic-austenitic duplex and superduplex stainless steels DSSs and SDSSs are an attractive option for dnnv equipment and connecting spools, in which the internal corrosion threats can be difficult to manage, using corrosion inhibition and in-line inspection. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition.
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 However, whilst these materials are advantageous for managing internal corrosion, they still require ep cathodic protection CP to prevent localized corrosion in seawater at typical operating temperatures.
Proceedings of an international conference Subsea Controls and Data Acquisition ‘ 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.
Proceedings of an international conference Oceanology: Proceedings of an International Conference Submersible Technology: Typical uses are short flowlines, welded hubs and flanges, manifolds, towheads, flowbases, sensors and valves.
To facilitate this comparison, comprehensive material characterization, small, intermediate and full scale environmental-mechanical testing, tp finite element analyses were conducted.