| 摘要 |
1,063,428. Carrying liquefied gases. ESSO RESEARCH & ENGINEERING CO. Jan. 7, 1966 [Feb. 24, 1965], No. 894/66. Heading B7A. An imprevious elastomeric sealing ring (21), Fig. 2 (not shown), which seals the circular access opening (20) between the main deck (16) of a cryogenic tanker and the cylindrical dome (19) of tank (17) projecting through the opening (20) is secured at its inner circumference (22) to the flange (23) of the dome while the tank is warmed up, i.e. empty, and is secured at its outer circumference (25) by fasteners (26) to the periphery of the opening (20) when the tank is chilled down on being filled with its liquefied gas cargo. By this method the sealing ring, which may be made from a urethane: foam material capable of being elongated at least one hundred per cent and possessing optimum thermal insulating properties when mechanically unstressed, will provide maximum thermal insulation of the tank (17) which has conventional thermal insulation (18) along its sides and a thermally insulated cover (19<SP>1</SP>). In an alternative method the sealing ring (21) may be completely fitted while the tank is warmed up by fastening the outer periphery of the sealing ring (21) to an extrinsic flange plate (31), Fig. 3 (not shown). |
