Abstract:
The present invention concerns a metal membrane for a low-temperature-fluid storage tank wherein horizontal and vertical creases are formed and both creases intersect each other. In the intersection of the creases, a bidirectional elastic member connected to each crease is formed so that the creases can be horizontally and vertically elastic. The bidirectional elastic member protrudes and is shaped like either a pyramid, a dome or a cross. Each metal membrane is welded into a unit panel and the edge of each metal membrane is welded with the common edge of another adjacent metal membrane to keep a cargo warehouse air-tight, and ultra-low-temperature LNG is stored inside the cargo warehouse, so when the metal membrane contracts due to thermal deviation, the present invention reduces plane rigidity and, at the same time, equalizes plane rigidity of two intersecting directions. Accordingly, durability is increased, air-tightness is maintained and storage of low-temperature liquid is stabilized, regardless of extreme thermal deviation. Furthermore, fabrication of the storage tank is improved because the present metal membrane is easily clamped by a clamping unit of a welding robot or a transfer device.
Abstract:
Disclosed are an insulation structure of an LNG carrier cargo tank and a construction method thereof. More particularly, provided are: an insulation structure for an LNG carrier cargo tank comprising a first metal foil attached between upper and lower insulation panels, a second metal foil attached to the 1st metal foil which is placed on top of the gap between the lower insulation panels, and a top bridge panel attached to the top of the second metal foil; and a construction method of the insulation structure. The present invention can improve the sealing force in the cargo tank.
Abstract:
The present invention relates to a reinforcement member for a membrane for improving the pressure endurance of the membrane having a corrugated portion, and to a membrane assembly having same and a construction method for same. The membrane is arranged on a heat insulation structure of the liquefied natural gas cargo and has a corrugated portion. The reinforcement member for the membrane is interposed between the heat insulation structure and the corrugated portion of the membrane to increase the strength of the corrugated portion. The reinforcement member of the present invention is capable of preventing the collapse of the corrugated portion and reducing impacts to the same load even without increasing the surface strength of the corrugated portion. The reinforcement member of the present invention has a heat insulation layer for improving heat insulation efficiency.
Abstract:
The present invention relates to the cargo hold of a vessel for transporting liquefied gas. The cargo hold of a vessel for transporting liquefied gas according to an embodiment of the present invention comprises: a main bulkhead surrounding a holding space for holding liquefied gas; a panel assembly surrounding the main bulkhead; and an outer wall surrounding the panel assembly. The panel assembly comprises: a plurality of first thermally insulated panels disposed a first distance apart; a plurality of first auxiliary bulkheads fixed at one surface thereof to the first thermally insulated panels; a plurality of second thermally insulated panels fixed to another surface of the first auxiliary bulkheads, and disposed at a second distance apart which is greater than the first distance; a bridge pad disposed in spaces between each of the second thermally insulated panels and spaced apart from the second thermally insulated panels; and a second auxiliary bulkhead disposed between the bridge pad and the first auxiliary bulkheads, and having one surface thereof fixed to the bridge pad and a portion of another surface thereof fixed to the first auxiliary bulkheads. A first fixing region is provided in which an adhesive is applied between the first thermally insulated panels and the first auxiliary bulkheads fixed on the first thermally insulated panels, to fix the first thermally insulated panels to the first auxiliary bulkheads; and a first stress distribution region is formed without any adhesive applied thereto in order to prevent damage to the first auxiliary bulkhead or the second auxiliary bulkhead due to thermal expansion or thermal shrinkage of the first thermally insulated panels and bridge pad.
Abstract:
The present invention is a corner panel for a liquefied natural gas cargo tank and is comprised of a main unit which forms a corner of the tank, and a stress distribution portion that reduces the concentration of stress on the main unit due to its formation as a curvature within the main unit. The invention prevents concentration of physical or thermal stress on the hull of a liquefied natural gas cargo tank and eliminates the possibility of destruction of the secondary barrier due to such stress concentration. The secondary barrier is also formed in curvature, and such construction allows the reduction of the thickness of the primary barrier due to the reduction of stress and improves the reliability of the secondary barrier by making the use of a hard wood key or plywood board unnecessary, and enabling a great reduction in weight in comparison to conventional cargo tank corner units.
Abstract:
An apparatus for the suppression of sloshing comprises a plurality of floating objects having a buoyant force for keeping them afloat on the surface of a liquid, a foam member which has an open cell structure for absorbing the liquid, and surrounds the floating objects, and a connection means for interconnecting neighboring floating objects, thereby effectively preventing liquid cargos from sloshing.
Abstract:
The present invention relates to a fixing device for a cargo hold insulation panel, and an insulation panel using the fixing device. The fixing device comprises: a fixing plate attached to one side of an insulation panel; a plurality of fixing brackets provided on the fixing plate in such a way as to protrude outward, the protruding portions being fixed to stud bolts provided on a ship body; and coupling means for coupling each of the fixing brackets to the fixing plate. In this way, the continuity of insulation panels can be improved; bonding and sealing with a member such as a supple triplex can be improved; vertical and horizontal alignment between neighboring insulation panels can be easily performed; and, by making fixing brackets retractable, damage from catching on other objects during transport of insulation panels and transporting difficulties can be avoided.