Apparatus and method for landing and retrieval of subsea modules

摘要

A hydraulically operated soft-landing cylinder comprises a first piston (1), and a second piston (2) within a housing (3). The pistons move to absorb both the initial shock on landing (piston (1) retracts) followed by controlled landing (piston (2) retracts). The cylinders may be installed in modules to allow both their landing and retrieval to and from subsea templates, retrieval following initial introduction of liquid to extend piston (2).