US3643903A - Base for a spherical container - Google Patents

Base for a spherical container Download PDF

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Publication number
US3643903A
US3643903A US662176A US3643903DA US3643903A US 3643903 A US3643903 A US 3643903A US 662176 A US662176 A US 662176A US 3643903D A US3643903D A US 3643903DA US 3643903 A US3643903 A US 3643903A
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US
United States
Prior art keywords
container
base
radius
millimeters
central recess
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Expired - Lifetime
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US662176A
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English (en)
Inventor
Per-Olof Eriksson
Finn Borsum
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Uddeholms AB
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Uddeholms AB
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Filing date
Publication date
Application filed by Uddeholms AB filed Critical Uddeholms AB
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/12—Supports

Definitions

  • a spherical container can be mounted on legs or on a cylindrical collar.
  • the zone where the wall of the container is in contact with the legs or the collar is subjected to a heavy load, and therefore the container has usually to be reinforced in said zone. It is possible to distribute the load on the wall of the container in a more even way if the container is mounted on a base having an upper spherical surface conforming to the surface of the container. Nevertheless, there is in very big containers the danger that the wall will be subjected to unallowed stress and deformation (buckling), particularly the wall portion adjacent the edge of the base.
  • the invention is based upon the fact that a spherical container made of steel, has a certain degree of elasticity. Therefore, the shape of the container when empty is different from the shape of the container when filled. It is the general object of the invention to provide a base which permits said elastic deformation of the container to take place.
  • the base shall be able to carry the container, empty as well as filled, without creating any permanent deformation of the wall of the container. It cannot be avoided that the pressure between the container and the base creates stresses in the wall of the container, but said stresses shall not be allowed to exceed the yield point ofthe material.
  • the maximal internal pressure of a container necessitates a certain predetermined wall thickness.
  • the pressure between the container and the base of this invention does not require any increase of said predetermined wall thickness, or any other reinforcement.
  • the invention is concerned with giving the upper surface of the base a shape eliminating the danger of fracture or deformation of the wall of the container, even in very big containers. It has been found, according to the present invention, that the upper surface of the base shall have the general shape of a sphere. and that the radius of said sphere shall be slightly longer than the radius of the container.
  • a base thus shaped, supports the spherical container with the weight of the container being substantially evenly distributed on the contact area between the container and the base.
  • the upper surface of the base shall have the general shape of a circle having the same radius as the container when unloaded, but the exact shape of said upper surface of the base shall deviate from the shape of said circle, the curve defining said deviation being within the hatched area of FIG. 1 of the accompanying drawing in which the abscissa represents the radius of the base, in millimeters, and the ordinate represents said deviation, one unit on the ordinate representing millimeters the base, in millimeters.
  • R is the external radius of the base, in
  • R is the radius of the central recess, if any, of the base in millimeters.
  • the base has a central recess it is preferred to choose a deviation approximately as represented by the curve 8 in FIG. 1.
  • the deviation at the inner edge of the base, that is at the radius R, is comparatively large.
  • the deviation has a minimum approximately halfway between R, and R,,.
  • the deviation At the outer edge of the base, that is at the radius R,, the deviation has a value higher than that of the inner edge.
  • the deviation is substantially constant from the center of the base, where R O, up to approximately 0.7 R,,, and increases to a highest value at the radius R,,, that is at the edge of the base.
  • the invention makes it possible to support a spherical container on a circular base having a radius much below that of the container.
  • the external radius of the base should not be more than 0.6 times the radius of the container. If the base contains a central recess said recess should preferably have a radius less than 0,75 times the external radius of the base. Further, the radius of the recess and the external radius of the base should preferably be chosen to satisfy the equation: I
  • the entire upper surface of the base is in contact with the container only when the container has its maximal weight, the weight of the container being evenly distributed on the surface of the base.
  • the container When the container is empty or filled only to a part of its full capacity, it is in contact with a portion of the base only.
  • a layer of a comparatively soft material betweenthe container and the base, such as rubber, cardboard, plastics or the like.
  • Said layer compensates for local defects in the shape of the container and the base.
  • the layer also adds a heat insulation between the container and the base.
  • the layer also permits a movement between the container and the base, for instance a movement produced by variations in temperature. It has been found that a useful layer consists of oil-resistant rubber having a surface layer of graphite and a corrosion-inhibiting fat.
  • FIG. 1 illustrates the diagram showing the deviation of the surface of the base from the spherical shape
  • FIG. 2 illustrates a corresponding diagram, numerical values having been added to illustrate the example which will be described below.
  • FIG. 3 illustrates a vertical cross section through a base of this invention and a portion ofa container supported by said base.
  • a spherical container It is desired to build a spherical container to contain 3,000 metric tons of a liquid having a density of approximately 0.6 kgJdm. (kilogram/cubic decimeter).
  • the external radius of the container shall be 10,800 millimeters.
  • the material of the container is a pressure vessel steel having a modulus of elasticity of 2 l ,000 kp./mm.
  • the maximal pressure inside the container requires a wall thickness of 31 millimeters.
  • An insulating layer is to be applied between the container and the base. Said insulating layer is to have a thickness of 20 millimeters, and is to be coated with graphite and a corrosion-inhibiting fat. It is desired that the container shall be subjected to a hydrostatic test pressure when filled with water.
  • the container has its maximal weight when filled with water, viz. 5.55 10 kilograms.
  • the safety factor against deformation (buckling) shall be 2.4.
  • the container when filled with the normal liquid weighs 3.3 10 kilograms, resulting in a safety factor against deformation of 4.
  • the base shall have a central recess having a radius of 2,000 millimeters.
  • Formula No (2) is now used for calculating the external radius of the base, resulting in a value of 4,920 millimeters. A somewhat higher value is chosen, viz. 5,000 millimeters.
  • the term No. (I) can now be calculated, resulting in avalue of 15.7 millimeters. It is now possible to calculate the numerical values for the corners of the hatched area of FIG. 1.
  • the abscissa of corner 7 is 5,000, since R 5,000.
  • the ordinate of corner 7 is 15.7, since the ordinate 1.0 according to FIG. 1 has to be multiplied by. 15.7, that is the value of term (1).
  • the abscissa and ordinate values of all the other corners of the hatched area have been calculated in the same way, and the numerical values have been added to the diagram of FIG. 2.
  • the base of the invention is illustrated in FlGv 3.
  • the base 1 has a central recess 5. This central recess is preferably used for housing the pumps and other auxiliary equipment used in the operation of the container.
  • the upper surface 2 of the base has been calculated and made as described above.
  • An insulating layer 4, covered with a corrosion-inhibiting fat and graphite, has been applied on the surface 2.
  • a container 3 is mounted on the base 1. The container, when empty, has a perfectly spherical bottom 3h. The bottom of the empty container is in contact with only a limited portion 4a of the insulating layer 4.
  • a base for a spherical container particularly, a very big container, said base having a circular horizontal cross section and being, if desired, provided with a central recess, the base having an upper surface deviating from the shape of the unloaded container, the radius of curvature in every point of the surface of the base being larger than the external radius of the container, the curve defining the deviation from the unloaded spherical container being arcuate and within the hatched area of FIG.
  • R is the thickness of the wall of the container adjacent the base, in millimeters
  • R is the external radius of the base, in millimeters
  • R is the radius of the central recess, if any, of the base, the curve within said hatched area counted from R, to R first continuously falling to a minimum on the abscissa and then again continuously raising whereby when the container is filled to its maximal weight the container is substantially evenly distributed on said base.
  • a base as claimed in claim 1 characterized in that

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Products (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Packages (AREA)
US662176A 1966-08-25 1967-08-21 Base for a spherical container Expired - Lifetime US3643903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE11505/66D SE303854B (es) 1966-08-25 1966-08-25

Publications (1)

Publication Number Publication Date
US3643903A true US3643903A (en) 1972-02-22

Family

ID=20294096

Family Applications (1)

Application Number Title Priority Date Filing Date
US662176A Expired - Lifetime US3643903A (en) 1966-08-25 1967-08-21 Base for a spherical container

Country Status (13)

Country Link
US (1) US3643903A (es)
AT (1) AT278659B (es)
BE (1) BE703023A (es)
CH (1) CH488906A (es)
DE (1) DE1709159A1 (es)
DK (1) DK122772B (es)
ES (1) ES142160Y (es)
FI (1) FI44849C (es)
FR (1) FR1534625A (es)
GB (1) GB1202237A (es)
NL (1) NL6711614A (es)
NO (1) NO120651B (es)
SE (1) SE303854B (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063394A (en) * 1975-11-19 1977-12-20 Buss Ag Spherical storage tank for gases and liquids, supporting base therefor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2837007C3 (de) * 1978-08-24 1981-03-12 Gebrüder Sulzer AG, 8401 Winterthur Lagerung für einen Kugelbehälter
DE3335545A1 (de) * 1983-09-28 1985-04-04 Kraftwerk Union AG, 4330 Mülheim Abstuetzvorrichtung fuer waagerecht liegende druckbehaelter
DE19943473B4 (de) * 1999-09-10 2005-11-10 Atu Armaturen Gmbh Dichtungsvorrichtung

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US929542A (en) * 1909-04-10 1909-07-27 Eugen Boermel Elevated water-reservoir.
US1670024A (en) * 1926-10-16 1928-05-15 Chicago Bridge & Iron Co Container
US1732829A (en) * 1926-12-11 1929-10-22 Boardman Company Tank support
US1958421A (en) * 1932-12-17 1934-05-15 Chicago Bridge & Iron Co Method of making spherical containers
US2302802A (en) * 1939-04-15 1942-11-24 Edward G Roberts Bowling ball carrier
US2313823A (en) * 1940-08-17 1943-03-16 Harrigan Wesley Bowling ball support
US2363992A (en) * 1942-05-09 1944-11-28 Smith Corp A O Support for spherical pressure vessels
US2870982A (en) * 1954-01-18 1959-01-27 Pfaudler Permutit Inc Tank supporting means
US2988333A (en) * 1959-06-15 1961-06-13 Frank J Mesic Flask support
US3043465A (en) * 1959-10-28 1962-07-10 Thompson Ramo Wooldridge Inc Tank
GB959166A (en) * 1962-05-11 1964-05-27 Constructiewerkplaatsen En Mac Improvements in supporting means for high pressure vessel

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US929542A (en) * 1909-04-10 1909-07-27 Eugen Boermel Elevated water-reservoir.
US1670024A (en) * 1926-10-16 1928-05-15 Chicago Bridge & Iron Co Container
US1732829A (en) * 1926-12-11 1929-10-22 Boardman Company Tank support
US1958421A (en) * 1932-12-17 1934-05-15 Chicago Bridge & Iron Co Method of making spherical containers
US2302802A (en) * 1939-04-15 1942-11-24 Edward G Roberts Bowling ball carrier
US2313823A (en) * 1940-08-17 1943-03-16 Harrigan Wesley Bowling ball support
US2363992A (en) * 1942-05-09 1944-11-28 Smith Corp A O Support for spherical pressure vessels
US2870982A (en) * 1954-01-18 1959-01-27 Pfaudler Permutit Inc Tank supporting means
US2988333A (en) * 1959-06-15 1961-06-13 Frank J Mesic Flask support
US3043465A (en) * 1959-10-28 1962-07-10 Thompson Ramo Wooldridge Inc Tank
GB959166A (en) * 1962-05-11 1964-05-27 Constructiewerkplaatsen En Mac Improvements in supporting means for high pressure vessel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063394A (en) * 1975-11-19 1977-12-20 Buss Ag Spherical storage tank for gases and liquids, supporting base therefor

Also Published As

Publication number Publication date
AT278659B (de) 1970-02-10
FI44849B (es) 1971-09-30
BE703023A (es) 1968-02-26
ES142160Y (es) 1969-10-16
DK122772B (da) 1972-04-10
DE1709159A1 (de) 1971-05-19
CH488906A (de) 1970-04-15
ES142160U (es) 1969-03-16
FR1534625A (fr) 1968-07-26
SE303854B (es) 1968-09-09
FI44849C (fi) 1972-01-10
NL6711614A (es) 1968-02-26
NO120651B (es) 1970-11-16
GB1202237A (en) 1970-08-12

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