HISC secure Clamp Connector

Offentlig prosjektsammendrag

Hydrogen Induced Stress Cracking (HISC) is well known and got full O&G attention when some subsea equipment failed due to HISC late 1990 and early 2000. Most notably at Foinaven in 1996 and later at Garn West / Draugen in 2003. Most HISC incidents involved duplex stainless steels and prompted many research programs; however, the industry needed an immediate remedy and increased safety factors and recommended alloys with historically few HISC problems, of which Alloy 625 was one. In a recent R&D project, Aker Solutions together with SINTEF have documented that Alloy 625 is susceptible to HISC, contrary to conventional industry learning. Based on this learning, Aker Solutions has (1) developed new in-depth understanding of relationship between material, loading and stresses, (2) used this knowledge to develop and test a new Clamp Connector, and (3) laid the ground for using digital twins for trouble shooting and rapid product development.