초록 ▼

A double wall tank for the transportation of cryogenic materials such as liquefied natural gas by ship. The inner wall of the tank is the primary barrier and defines the cargo space. The primary barrier is substantially planar and is liquid and gas-impervious. A plurality of primary structural suppo

A double wall tank for the transportation of cryogenic materials such as liquefied natural gas by ship. The inner wall of the tank is the primary barrier and defines the cargo space. The primary barrier is substantially planar and is liquid and gas-impervious. A plurality of primary structural support webs are welded to the inner surface of the primary barrier and extend into the cargo space. The primary structural support webs preferably comprise a plurality of web rings extending between the centerline longitudinal bulkhead and the sides of the inner tank and having plurality of tension trusses extending transversely in the inner tank and connecting opposite sides of the web rings. A plurality of stiffeners are welded to the outer surface of the primary barrier and extend substantially perpendicular to the plane of the primary structural support webs. The outer wall of the tank is the secondary barrier, is spaced from the primary barrier and is supported by the stiffeners. The secondary barrier is formed from thin sheets of metal, is non-self-supporting and is liquid and gas-impervious. Insulation, preferably in the form of a plurality of insulation panels, is located outside of the secondary barrier for thermally insulating the tank.

대표청구항 ▼

A double wall tank for the transportation of cryogenic materials by ship, the tank comprising: a liquid and gas-impervious primary barrier defining a cargo space, said primary barrier being substantially planar; a plurality of primary webs rigidly connected to the inner surface of said primary barri

A double wall tank for the transportation of cryogenic materials by ship, the tank comprising: a liquid and gas-impervious primary barrier defining a cargo space, said primary barrier being substantially planar; a plurality of primary webs rigidly connected to the inner surface of said primary barrier and extending into said cargo space in a plane substantially perpendicular to the plane of said primary barrier; a plurality of stiffeners rigidly connected to the outer surface of said primary barrier and extending substantially perpendicular to the plane of said primary webs, each of said stiffeners comprising a web portion lying in a plane substantially perpendicular to the plane of said primary barrier, a primary flange portion attached to said web portion, lying in a plane substantially parallel to the plane of said primary barrier and rigidly connected to the outer surface of said primary barrier, and a secondary flange portion spaced from said primary barrier, connected to said web portion of said stiffener and lying in a plane substantially parallel to the plane of said primary barrier; a secondary barrier spaced from and surrounding said primary barrier and attached to said secondary flange portion of said stiffener in a liquid and gas-impervious manner, said secondary barrier being substantially planar and non-self-supporting, said secondary barrier comprising a plurality of thin metal sheets attached at their sides to the secondary flange portion of said stiffeners; insulation means located outside of said secondary barrier for thermally insulating said tank, said insulation means comprising a plurality of thermal insulation panels supported by said stiffeners and providing a backing and support for said thin sheets of metal comprising said liquid and gas-impervious secondary barrier; means for attaching each thermal insulation panel to a pair of adjacent stiffeners in a substantially liquid and gas-impervious manner; and means for attaching adjacent thermal insulation panels to each other in an overlapping and substantially liquid and gas-impervious manner.