ABSTRACT
This chapter presents a design of the subsea manifold protective structure against dropped objects. Subsea structures are always subjected to accidental risks induced by fishing gears and dropped objects. The risk of accidental loads induced by fishery and offshore lifting operation always exists during an operation of subsea structure for oil and gas production. A protective structure for a subsea manifold should be capable of protecting the subsea manifold frame and the internal piping system from accidental loads such as drop impacts and snag loads. The point-load condition was applied to describe the most severe impact condition when the dropped objects hitting the subsea manifold protective structure. The subsea manifold was only modeled as its outside frame to figure out whether the protective structure reached to the subsea manifold after impact. Basic specifications of the subsea manifold protective structure were determined to protect the subsea manifold from determined dropped object scenarios.
