Subsea Systems Functional Failure Consequence Classification: A Case Study From a Subsea Manifold

Subsea systems’ functional failure consequence classification (FFCC) and initial screening has been a stringent requirement for subsea systems operating on the Norwegian Continental Shelf (NCS). Hence, it is of great importance to establish approach(es) for the subsea systems’ FFCC. The study performed in this manuscript focuses on adapting existing guidelines, which are available in NORSOK Z-008, to develop an approach for performing the FFCC for a subsea system. A case study has been carried out which is closely aligned with a real-time project to perform subsea manifold related FFCC. The approach has been developed with the help of existing internal documents, data, information, and the experiences of the subsea systems’ owner as well as requirements pertaining to regularity authorities’ related guidelines, other existing similar work and established standards. The manuscript also illustrates a framework of the work process and illustrative analysis results.