| 摘要 |
An improved fluid transfer system for a tanker vessel adapted for the transportation of fluid chemical and petroleum products in water. The vessel includes a hull comprising a bottom and sides, a top deck, a plurality of watertight cargo compartments disposed within the hull between the top deck and the hull bottom for receiving the fluid products, cargo expansion trunks coupled to and opening downwardly into each of the cargo compartments, branch vent lines coupled to the cargo expansion trunks and including pressure/vacuum relief valves, and a longitudinally disposed trunk vent line including a pressure/vacuum relief valve coupled to the branch vent lines and communicative with the atmosphere for venting contaminated gases formed by the fluid products and contained within the cargo compartments of the vessel from the cargo compartments through the cargo expansion trunks and the branch vent lines to the atmosphere. The improvement of the invention comprises bypass vent lines including vent closure valves which are coupled at one end to the trunk vent line of the vessel and at the other end to the cargo expansion trunk of at least one cargo compartment of the vessel. The vent closure valves are adapted to be opened and couple the trunk vent line to the cargo expansion trunk of the cargo compartment through the bypass vent line and thereby bypass the pressure/vacuum relief valve of the branch vent line to vent contaminated gases from the cargo compartment through the cargo expansion trunk and the bypass vent line to the trunk vent line of the vessel. |
