Patent ID: 9580974
Date: 2017-02-28
CPC Classifications: E21B,Y10T

Claim:
1. A safety joint comprising: a first riser part and a second riser part which overlap in an axial direction, each riser part having a respective end connection which is connectable to a corresponding section of a riser; a release unit which includes at least one axially extending tension rod connected between the first and second riser parts; wherein the release unit is configured such that, in a not activated mode of the release unit the at least one tension rod locks the first and second riser parts together, in a partly activated mode of the release unit the at least one tension rod plastically deforms and thereby allows the first and second riser parts to move apart an initial distance, and in a fully activated mode of the release unit the at least one tension rod breaks and thereby allows the first and second riser parts to move apart an additional distance before the first and second riser parts separate from each other.