A latch for separating a workover riser from a subsea isolation system in the event of over-tensioning

摘要

The latch 11 includes a first portion 88 adapted to be connected to a subsea isolation system, a second portion 90 adapted to be connected to a workover riser 12, the second portion 90 is releasably connected to the first portion 88, by means of eight shear studs 92. Latching dogs 98 are releasably connecting the first portion to the subsea isolation system. When the tension in the workover riser exceeds a pre-determined value, the shear studs break allowing relative movement of the second portion with respect to the first portion which releases the latching means from the subsea isolation system and allows the workover riser to separated from the subsea isolation system.