DK145314B - HEAD PIECES FOR LIQUID GASTE CARTRIDGES - Google Patents

Description

(19) DENMARK (W.

(12) PRESENTATION A, 1U531 B

PATENT DIRECTORATE. AND THE TRADE BRAND

(21) Application No. 1 604/69 (51) Lnt.CI.s F 17 Q 3/02 (22) Filing date 24 Mar. 1969 (24) Race day 24 Mar 1969 (41) Aim. available 27 · Ββρ. 1969 (44) Posted 25 Oct. 1982 (86) International Application No. - (86) International Filing Day - (85) Continuation Day - (62) Master Application No. -

(30) Priority Mar 26 1968, 145427, PR

(71) Applicant CONCH OCEAN LIMITED, Nassau, BS.

(72) Inventor Gilbert Massac, FR.

(74) Associate Engineer Hofman-Bang & Boutard.

(54) Liquid gas container corner piece.

The present invention relates to a container with corner pieces of the kind specified in the preamble of claim 1.

The invention thus relates to containers for storing the transport -3 "of cold liquids, such as liquid gases at a pressure close to - and of atmospheric, for example liquid natural gas. Such containers are used.

The invention relates only to containers of the type termed integrated tank containers or membrane tanks, which consist of a housing 2 145314 of load-bearing thermal insulation lined with a primary barrier for liquid in the form of a thin and flexible liquid-tight membrane tank of sheet material, e.g. .g. a metal which is not subject to cold brittleness and which is not self-supporting but is carried by the surrounding solid insulation to absorb the internal loads from hydrostatic pressure and inertia forces. The insulation resides in a lining and is even carried by a rigid support sheath, so that the insulation will transfer all the pressure exerted by the liquid against the walls of the membrane tank directly to the rigid support sheath.

The walls of the membrane tank of a container of the kind in question will contract as they come into contact with the cold liquid unless prevented therein by external means. The invention relates only to containers of the type in question and of the type in which the membrane tank is retained against major dimensional changes, so that the membrane tank remains in contact with and carried by the insulation, and where it is formed with a dual system of expansion corrugations extending convexly along the inside of the tank. It is to be understood that each wall of the diaphragm tank is formed with a plurality of corrugations extending parallel to one another and having substantially the same cross-sectional dimensions, and another system of corrugations, also mutually parallel and having similar cross-sectional dimensions, intersecting corrugations. preferably in the first system at right angles, and with cross-sectional dimensions different from those in the first system. These two-way corrugations provide excess metal to accommodate the contraction of the walls during cooling, so that the tank's main dimensions will remain unchanged. In a container of this type, the corners of the diaphragm tank are formed of two corrugations and an intermediate connecting surface, hereinafter referred to as "formation", across the corner and corresponding to the corrugations in the tank walls, the corrugations and formation containing excess metal allowing extending and contracting the corner piece longitudinally of the corner.

Containers as described in the previous two sections will hereinafter be referred to as "containers of the specified type".

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It is to be understood that the term "corner" is used hereinafter to denote the connection between two adjacent walls or wall portions or between a side wall and the bottom or top of the membrane tank. The invention thus relates only to containers with flat walls or wall parts. Such containers can have any geometric shape. They will usually be prismatic or parallel-epipedic, but may also have more complicated shapes with walls consisting of intersecting flat parts. be designed to fit in the bow of a tanker. For a tank with flat side walls, the corner angle may be a right angle, but it may also be blunt or pointed, depending on the geometric shape of the tank. logging off the corners of a tank can form a closed angle, i.e. less than 180 °. However, the tank may also have two-sided corners projecting or inward, especially in connection with a tank neck.

As the walls of the membrane tank are formed with longitudinal and transverse corrugations with two different cross-sectional shapes, in a rectangular or parallelepipedic tank there will be three different forms of home joints. In a mold, termed "type a", there is a connection between two corrugations of the same small cross-sectional size in the two walls. In another form, "type b", there is a connection between two large cross-section corrugations in the two walls. In a third form, 'type c', a connection is made between large cross-sectional corrugations in one wall and small cross-sectional corrugations in the other wall. in the walls that are connected. In a conventional arrangement, the corner piece is formed by folding a flat plate and forming the two sides each with a corrugation of the correct size across the corner and with an opening at the corner between the two corrugations, which opening is then closed with a special wedge piece. which are welded in and form a formation connecting the two corrugations. The corrugations on each side are thus of uniform size, corresponding to the corrugations in the adjacent wall. The corner piece may have two large corrugations or two small corrugations or a small corrugation of constant cross section and a large corrugation of constant cross section. In all cases, the corrugations in the upper eagle piece connect to the formation constituted by the wedge plate. Such known pieces of furniture carried certain disadvantages. One disadvantage is that it is made of two parts.

Another disadvantage is that the bear piece, especially the wedge plate, is too stiff. During use, minor changes occur in the angle between two adjacent walls of a diaphragm tank and thus between the two sides of each corner piece between the two walls, thereby creating bending stresses so that the boom can tear or the wedge plate may break away from the bear piece.

In French Patent No. 1,447 '913, there is disclosed a bear piece formed solely by folding a flat plate to form two transverse corrugations in the bear plate, joined by a complicated fold formation at the bear line. Further, the disclosure of French Additional Patent No. 88,311, to the above-mentioned patent, discloses various improvements or modifications to this construction. The designs shown in these patents have certain advantages over the conventional designs. Unless a bear piece of this kind is folded by a flat plate without straining it too much, it is less prone to being overworked in use, regardless of minor changes in the angle of the bear. However, there will still be tension in the complicated formation connecting the corrugations in the corner piece. This is particularly the case with a corner-piece with two corrugations with a small cross-sectional dimension, since the formation also carried small cross-sectional dimensions, resulting in higher stresses, using this construction it was the practice that the connecting formation had a size corresponding to the size. of the corrugations.

The object of the present invention is to provide an improved shape of a corner piece which is less prone to overwork. A further object is to provide a form of a bear piece which can be readily adapted for use at corners of the above types a, b, c.

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The container with corner pieces according to the invention is characterized by the characterizing part of claim 1.

Due to the fact that the corner pieces are made with corrugations, of which at least one successively increases in cross-sectional dimensions against the connecting formation, it can have such a large cross-section that the stresses are reduced to a minimum and the corner nest pieces are less exposed to breakage. . Bone connecting formation according to claim 2 can have the required constant large extent, regardless of the size of the corrugations in the two sides of the corner piece and the size of the corrugations in the connected walls.

A corner piece according to claim 4 for use with a type c connection will be formed with one of its corrugations of uniform size greater than the minimum size of the other having at the edge of the corner piece small cross-sectional dimensions for connection to small corrugations in said wall and increases. in cross-sectional dimensions against the corner angle to go into the first corrugation at the connecting formation.

In a corner piece for use with a type a connection, both corrugations increase in size against the connecting formation, thus having large cross-sectional dimensions despite the small dimensions of the corrugations on both sides of the corner piece. Accordingly, the corrugations on both sides of the corner piece will have varying cross-sectional sizes, increasing from a small cross-section at the edges corresponding to the small cross-section of the corrugations in the connected walls and will gradually grow in cross-section towards the center of the corner piece where they will have a large cross-section corresponding to the cross section of the connecting formation. Right-hand pieces of the invention will be used in conjunction with corner pieces for use in type b connections, in which the two-side corrugations will have the required large cross-section to match the large cross-section of the corrugations to be connected.

Thus, corner pieces for use in compounds of types a, b and c will all have connecting formations of the same dimensions. Bet means that corner pieces for use in connections of types a and c may have connecting formations of 6 14531Λ the same large cross-sectional size as the formation connecting large cross-section corrugations in a corner piece for use with type b connections. Connecting formation is described as having a cross-sectional size corresponding to the cross-sectional size of the largest corrugations, this means that the formation goes smoothly into the corrugations but may have complicated cross-sectional shape.

The corner pieces can be of any suitable shape. Specifically, the bonding formation may be of any suitable shape, provided that it smoothly corrugates on both sides and provides excess metal in the longitudinal direction of the corner to accommodate contraction. The corner piece is preferably, but not necessarily, formed by folding a single flat plate.

In this regard, the corner piece may be substantially the same shape as disclosed in the descriptions of French Patent No. 1,447.

913 or its Additional Patent No. 88,311. Thus, the connecting formation may have complicated cross sections.

Preferably, the corner pieces are made of a single flat plate which folds to the required corner angle, e.g. 90 °, and each of the two sides is formed with a single corrugation extending from the free edge toward the center at the corner line. Along the middle, the corner piece is formed with a formation that joins and joins the corrugations in two sides and provides excess metal to accommodate contraction along the longitudinal direction of the corner. This formation comprises a convex corrugation between two U-shaped valleys across the respective corrugations of the two sides. Preferably, the connecting corrugation may be formed with a concave corrugation of small cross-section parallel to the corner, as defined in claim 3.

In the following, some embodiments of a container designed with such corner pieces according to the invention will be described with reference to the drawing, in which: 1 is a perspective schematic of a portion of a cubic membrane tank whose walls are formed with parallel cross-sections of small cross-section and transverse parallel corrugations of large cross-section, the figure showing the various types of corner joints,

7 14531U

FIG. 2 is a perspective view of a corner piece for use with a type b connection; FIG. 3 shows a corner piece for use with a type a connection, FIG. 4 is a corner piece for use with a type c connection, while FIG. 5 shows a section along the line Y - Y in FIG. 2nd

The FIG. 1, tank 1 has a dual system of corrugations, each wall having a series of corrugations 2 which are convex into the tank, parallel to each other, in one direction and of the same large cross-section, and a second series of corrugations 3, which are also are parallel to each other and extend convexly into the tank, which cuts the corrugations of the first system at right angles and has a smaller cross-sectional size than these. At the corner designated a, corrugations are joined in two walls, a side wall 4 and an upper side 6, with the same small cross-sectional shape. At the shown corner line b, connections between corrugations are formed in two adjacent sidewalls 4 and 5 of large cross-section. Finally, at the corner line o, there is a connection between the side wall 5 and the upper side 6 between large cross-section corrugations in the upper side and small cross-section corrugations in the side wall.

The FIG. 2 is formed by a single rectangular flat plate folded along a line 8 to the required corner angle, e.g. 90 °, and each of the two sides 7a and 7b is formed with a single corrugation 9 and 10, respectively, extending from the free edge towards the center of the corner piece at corner line 8. At the center, the corner piece is formed with a formation 11, see fig. . 5, which smoothly joins and connects the corrugations 9 and 10 on the two sides and which contains excess metal for receiving contraction in the direction of the line 8. This formation 11 contains a connecting convex corrugation 12 of smaller cross-section than the adjacent corrugations 9 and 10, bounded by U-shaped valleys 13, passing into respective corrugations 9 and 10 on the two sides. The middle portion of the connecting corrugation is preferably depressed concave to form a small fold in the area that would otherwise be the highest.

8 14531A

part of the connecting corrugation.

The corner piece shown in FIG. 3 corresponds to that of FIG. 2, except for the shape of the corrugations 9 ^ and 10 ^ in the two sides of the corner piece. Thus, formation 11 has the same size and shape. In contrast, the corrugations 9 ^ and 10 ^ in the two sides have varying cross-sectional sizes. Thus, each of these corrugations has against the edge a portion 9a and 10a of small constant cross-section and an adjoining portion 9b and 10b having gradually increasing cross sections which smoothly pass into the central formation 11.

The FIG. 4 corresponds to the previous ones, except that only the corrugation IO2 in one side of the corner piece corresponds to the one in fig. 3 corrugation 10 ^.