subsea isolation valve (SSIV)

A valve that isolates a section of the subsea pipeline or riser in the event of an emergency, maintenance, or repair activities. It allows operators to stop the flow of hydrocarbons in case of a pipeline ruptureFailure of the pipe in a manner that involves unstable extension or propagation of a fracture, resulting in a release of pipe contents and usually an inability …, equipment malfunction, or other unforeseen circumstances.