B - Operations – Transporting – 63 – B
Patent
B - Operations, Transporting
63
B
114/9
B63B 25/08 (2006.01) B63B 25/10 (2006.01) B63B 57/04 (2006.01) B63J 2/10 (2006.01)
Patent
CA 1101739
19 IMPROVED METHOD AND APPARATUS FOR VENTING HYDRO- CARBON GASES FROM THE CARGO COMPARTMENTS OF A TANKER VESSEL ABSTRACT: An improved method and apparatus for venting hydrocarbon gases from the cargo compartments of a tanker vessel for the transportation of oil in water, which tanker vessel includes a hull comprising a bottom and sides, a top deck, a plurality of watertight cargo compartments disposed in the hull between the top deck and the hull bottom for receiving the oil, and vent means coupled to each of the cargo compartments and communica- tive externally of the compartments for venting hydrocar- bon gases to and from the cargo compartments and the atmos- phere during loading, discharge and transfer of oil and ballast from the compartments. In an apparatus according to the invention, the improvement comprises valve means, coupled to and communicative with at least two of the cargo compartments and disposed at the top of the compart- ments, which interconnects the two cargo compartments for venting hydrocarbon gases from one of the two compartments to the other of the compartments after discharge of oil from the one of the compartments. In a method according to the invention, the valve means coupled to one of the cargo compartments from which oil is to be discharged is opened subsequent to discharging oil from the compart- ment so as to operatively interconnect the compartment with another, empty compartment in the tanker vessel. The vent means of both compartments are then closed so as to render the compartments non-communicative to the atmos- phere. The emptied cargo compartment is then filled with a liquid so as to expel the hydrocarbon gases from the compartment and vent the gases to the other of the cargo compartments through the valve means.
319898
Conway Charles S.
Gowling Lafleur Henderson Llp
LandOfFree
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