Structures of metal for offshore import and export terminals; structures of metal for offshore constructions for the production of oil and gas; metal piping systems for use in the offshore industry; structures of metal for mooring systems for offshore installations; metallic pipes, piping, rigid loading arms, metal structures, valves, pipe and hose connectors for the transport, distribution and transfer of gas, liquid gas and ammonia used in the offshore industry; aerial metallic hoses, floating metallic hoses, metallic constructions for the storage, transfer and distribution of gas, liquid gas and ammonia in offshore and near-shore installations, metallic pipelines for transporting liquefied or compressed gas from or to shore or for the transfer between offshore systems, floating structures of metal for receiving and/or processing natural gas, gas, liquid gas and ammonia; floating structures of metal for storing and/or re-gasifying liquefied gasses for transportation to shore by pipeline; gas export or import buoys of metal; structures of metal for gas export or import terminals which are fixed to the seabed; floating structures of metal moored to the seabed for mooring tankers during the transfer of fluids and gasses; floating structures of metal for use in loading and offloading systems; submersible systems for use in loading and/or offloading systems, specifically submerged metallic structures and disconnectable metallic buoys forming part of a system for loading/unloading crude oil and gas in the offshore industry, submersible floating structures of metal allowing pipes to span a long distance in order to load and offload crude oil and gas, submersible metallic structures and buoys for the transport of crude oil, gas, liquid gas and ammonia; risers of metal for the transport of crude oil, gas, liquid gas and ammonia to or from tankers or processing vessels in the offshore industry; all the aforesaid goods being of metal.