Safety joint

US9580974B2 · kind B2 · utility

Assignee

• FMC Kongsberg Subsea AS · NO

Inventors

• Hans-Paul Carlsen · Notodden, NO
• Tor-Øystein Carlsen · Kongsberg, NO
• Olav Inderberg · Kongsberg, NO
• Anthony D. Muff · Kongsberg, NO
• Arild Sundkvist · Kongsberg, NO
• Pål Fadum · Kongsberg, NO
• Roy Arne Klevstad · Kongsberg, NO
• Thor-Arne Løvland · Oslo, NO
• Simen Rønne · Kongsberg, NO
• Geir Tandberg · Drammen, NO
• Bernt Olav Tømmermo · Notodden, NO

Key dates

• Filing date: Jan 7, 2014
• Grant date: Feb 28, 2017
• Expiry date: Jan 7, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/1774
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

The invention relates to a safety joint and a method of operation, the safety joint comprising: a first riser part and a second riser part overlapping in an axial direction and having end connections to be connectable as part of a riser, a release unit, locking the two riser parts together in a not activated mode, the release unit having other modes comprising a partly activated mode and fully activated mode, where the release unit comprises at least one axial extending tension rod connected between the two riser parts, which tension rod is configured to deform plastically before breaking, thereby activating the partly and fully activated modes.