US3855811A - Insulation for liquid gas containers, especially spherical containers - Google Patents

Insulation for liquid gas containers, especially spherical containers Download PDF

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US3855811A
US3855811A US32839773A US3855811A US 3855811 A US3855811 A US 3855811A US 32839773 A US32839773 A US 32839773A US 3855811 A US3855811 A US 3855811A
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Prior art keywords
panels
insulation
inner
outer
panel
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Expired - Lifetime
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I Sauerbrunn
R Bellemann
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Rheinhold and Mahla GmbH
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Rheinhold and Mahla GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00Details of vessels or of the filling or discharging of vessels
    • F17C13/001Thermal insulation specially adapted for cryogenic vessels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01Shape
    • F17C2201/0128Shape spherical or elliptical
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00Vessel construction, in particular walls or details thereof
    • F17C2203/03Thermal insulations
    • F17C2203/0304Thermal insulations by solid means
    • F17C2203/0329Foam
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00Handled fluid, in particular type of fluid
    • F17C2221/03Mixtures
    • F17C2221/032Hydrocarbons
    • F17C2221/035Propane butane, e.g. LPG, GPL
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146Two-phase
    • F17C2223/0153Liquefied gas, e.g. LPG, GPL
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146Two-phase
    • F17C2223/0153Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00Applications
    • F17C2270/01Applications for fluid transport or storage
    • F17C2270/0102Applications for fluid transport or storage on or in the water
    • F17C2270/0105Ships
    • F17C2270/0107Wall panels
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S220/00Receptacles
    • Y10S220/902Foam

Abstract

Insulation for liquid gas container and particularly spherical containers is disclosed. Plastic insulating panels having rabbeted edges are arranged in rows over the surface of the container. Each adjacent row is staggered one half panel length. A fastening element is embedded in the center of each panel. A second layer of panels is superposed over the inner layer such that the panels of the upper layer are staggered with respect to the panels of the inner layer and are held in place by means of the fastening elements fastening the rabbeted edges of the upper layer of panels.

Description

1t States Patent 1191 Sauerlbrunn et al.

1451 Dec. 24, 1974 INSULATION FOR LIQUID GAS CONTAINERS, ESPECIALLY SPHERICAL CONTAINERS [75] Inventors: llrmliild Sauerbrunn,

Altenbach/Odw.; Rudolf Bellemann, Rot, both of Germany [73] Assignee: Rheinhold & Mahba GmbH,

Anlage, Germany 22 Filed: Jan. 31, 1973 1211 Appl. No.: 328,397

[30] Foreign Application Priority Data [58] Field of Search 62/45, DIG. l3; 220/9 LG, 220/9 A, 9 F, 15; 114/74 A; 52/408; 161/36,

[56] References Cited UNITED STATES PATENTS 2,928,565 3/1960 Glasoe, Jr. 220/9 A 3,196,622 7/1965 Smith et 211..

3,487,971 1/1970 Kirgis et al 152/45 Primary Examiner-Meyer Perlin Assistant ExaminerRonald C. Capossela Attorney, Agent, or Firm-Browdy and Neimark [5 7 ABSTRACT Insulation for liquid gas container and particularly spherical containers is disclosed. Plastic insulating panels having rabbeted edges are arranged in rows over the surface of the container. Each adjacent row is staggered one half panel length. A fastening element is embedded in the center of each panel. A second layer of panels is superposed over the inner layer such that the panels of the upper layer are staggered with respect to the panels of the inner layer and are held in place by means of the fastening elements fastening the rabbeted edges of the upper layer of panels.

8 Claims, 4 Drawing Figures I. I i; f i] 1 PATENT El] 0512241914 SHEET 3 or 3 Fig.4

INSULATION FOR LIQUID GAS CONTAINERS, ESPECIALLY SPI-IERICAL CONTAINERS FIELD OF THE INVENTION The invention concerns an insulation for liquid gas containers, especially spherical containers, consisting of individual insulating panels.

BACKGROUND OF THE INVENTION Liquified gas, for example natural gas, methane or the like is being transported over long distances and stored in large quantities to an increasing degree. The insulation of transport or storage containers for liquid gas involves considerable difficulties. In the case of cubic or cylindrical containers, costly and difficult designs are required for insulation, since the insulation must be rigid and possess great strength. It is difiicult to attach the insulation to the container, since the use of fastening elements welded to the container is usually not allowed and is impossible due to the different degrees of expansion of the different materials at low temperatures. Foam plastics, which have proven to be highly efficient as insulators, have large expansion coefficients (and in the cold, large contraction coefficients) that result in considerable joint formation and cold bridge formation, so that undesirable convection currents develop. The considerable temperature differences also means that the contraction coefficients of the metal and foam are different and in those systems in which individual plastic panels are firmly connected together or which consist of a homogeneous layer of insulation, internal stresses (the additional stresses encountered aboard ships, caused by vibration and rolling) lead to cracking and thus to uncontrolled joint formation.

Types of insulation are already known that consist of particularly costly designs, e.g., laminated plywood panels with polyurethane foam and balsa wood, which are used especially for cubic containers.

It has also been proposed to insulate the containers on the site with plastic foam and thus to apply the insulating covering as a whole. It has been found, however, that in the course of time cracks develop at point that cannot be checked, which are hard to detect and can run from thecold side to the warm side.

Attempts have also been made to overcome these difficulties with loose insulation, thereby doing away with crack formation. In order to overcome difficulties in moving the container during the cooling and heating processes, intermediate layers of mineral fibers have been provided. It is still unclear, however, how long the elasticity of this fiber material is retained.

Finally, it has been attempted to avoid convection in the spaces by filling the joints between the individual panels with elastic fiber insulators and providing flexible buffers between the panels. The flexible buffers become useless, however, if ice forms through convection in the joints at low temperatures; the ice is deposited on the fiber insulation and makes the fibers brittle, so that they break during movement, e.g. when the panels are shifted by expansion.

SUMMARY OF THE INVENTION An object of the present inveniton is to make an insulating material for containers used to transport and/or store very cold liquids, said insulation possessing a certain stiffness that prevents the formation of through cracks, with the resultant number of joints being exactly definable both as to position and dimensions, and also possessing technical advantages with respect to both insulation and assembly, especially a facilitation of assembly with regard to precision and freedom from flaws.

This purpose is accomplished according to the invention primarily by the fact that at least two layers of plastic panels are provided that have rabbeted edges and have fastening elements at their centers, said panels being mounted in two superposed layers. The central fastening elements of the inner panels fit into the rabbeted edges of the outer panels and the panels in the inner layer are staggered with respect to each other and with respect to the panels of the outer layer.

In this manner, all through joints are eliminated. The combination of punctiform fastenings in the insulation itself avoids through heat bridges. It is important in this regard that the central fastening elements face the cold side of the insulation, so that these panels can contrast toward the center. With such an insulation according to the invention, self-supporting domes can also be made for insulating spherical containers, said containers being insulated on all sides without additional fastening means. No forces are transmitted from the container to the insulation during the cooling and warming processes.

It is particularly advantageous if the insulating panels have rabbeted edges such that molded shoulders are formed where two edges butt against each other. This ensures a very tight connection between abutting insulation panels and avoids through cracks in one layer.

According to a further feature of the invention, known force-accepting elements can be molded into the centers of the panels, at approximately half the thickness of said panels, and connected to the fastening and holding elements. Such known force-accepting elements require a relatively small panel area for fastening and allow distribution of force over a large area, so that relatively large forces can be withstood even when applied vertically to the panel plane, without the forceaccepting elements being torn out of the panels. The relative movements of the inner layer that result from expansion due to heat and contraction due to cold can act on the fastening points on the centers of the elements.

It is especially advantageous if the panel elements in one layer are arranged in rows and each row is staggered by one-half the panel length with respect to the adjacent row. A further advantageous embodiment of the invention consists in that the panel elements and rows of the outer layer are applied so as to be staggered with respect to the panel elements in the lower layer on all sides.

Further features and advantages of the invention will be described in more detail with reference to the drawing, which schematically shows sample embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I: Arrangement of insulating elements, top view.

FIG. 2: Cross section through the arrangement in FIG. 1.

FIG. 3: A detail of the connection between the two layers on an enlarged scale, and

FIG. 4: Schematic representation of an insulating panel element according to the invention.

It is clear from FIG. I that the insulation consists of individual insulating panels 2 and 3 that are arranged in sequential rows and in adjacent rows, with adjacent rows being staggered approximately half a panel length with respect to each other. It is also evident that the insulation consists of two layers with the panels in the outer layer being staggered with respect to the plates in the inner layer with respect to both length and width and also staggered with respect to the adjacent rows of panels in the outer layer. The panels in the inner layer have fastening means in their centers; the prongs 7 of said fastening means can be seen in FIG. 1, and fit into the rabbeted edges 11 of the outer panel 3.

It is clear from FIGS. 2 and 3 that the panels 2 of the inner layer are mounted above the container wall 1 in such a fashion that projection 8 on panel 2 is slid over shoulder 10 on a second panel 2, thus avoiding a through joint. Plates 2 on the inner layer have forceaccepting elements 4 molded approximately in the center of the panel, said elements having hexagon-head screws 5 and fastening prongs 7 and lock washers 6 on said hexagon-head screws. After installation of the inner panel layer the panels of the outer layer are applied and placed with shoulders in the vicinity of the fastening means 5,6,7. When screw 5 is tightened prongs 7 are pressed into panel 3 and then an adjacent panel 3 is slid on so that the corresponding projection 8 comes to rest on shoulder 10 on the first panel. Since the fastening means for the panels in the two layers are completely contained inside the insulating layer, through cold or heat bridges are completely avoided.

As soon as container 1 is filled with a very cold liquid, a temperature gradient is created inside the insulation,

with the temperature decreasing steadily from the outer surface toward the container wall 1. The result is that the panels in the inner layer undergo a greater degree of contraction than the panels in the outer layer. This creates individual wedge-shaped spaces between the individual panels, but the spaces are always staggered with respect to each other and involve only a fraction of the insulating layer thickness. By means of this arrangement and mounting of the insulating panels an inherently rigid connection is achieved without heat bridges and without formation of through joints. Thus, it is also advantageously achieved that a plywood covering, which might be applied in addition on top of the outer layer (or a fireproofing layer so applied), cannot rupture in the region of the joints.

The container wall 1 is a part of a relatively large sphere with a large radius so that the individual panels 2,3 can be viewed practically as flat panels. The invention is not limited to the sample embodiments shown and described. It includes all advantageous and expert modifications as well as all partial and subcombinations of the described and/or shown features and measures.

What is claimed is:

1. Insulation for liquid gas containers comprising:

a plurality of molded inner foamed synthetic insulating panels each having rabbeted edges, each having a fastening element at the center thereof projecting upwardly from approximately halfway through the thickness thereof and each having a forceaccepting element embedded in the center of each panel during molding thereof at approximately half the thickness of said panel;

said inner insulating panels being adapted for arrangement on a gas container with each panel being staggered with respect to at least one of the next adjoining panels and interlocking therewith;

a plurality of outer insulating panels having rabbeted edges;

said outer insulating panels being adapted for arrangement on said inner insulating panels with each outer panel being staggered with respect to at least one of the next adjoining outer panels and interlocking therewith and each said outer panel being staggered with respect to said inner panels; and

wherein said fastening elements of said inner panels fit into the rabbeted edges of said outer panels.

2. Insulation in accordance with claim 1 wherein said fastening element comprises a clamping screw and fastening prong which are linked to said force-accepting element.

3. Insulation in accordance with claim 1 wherein said inner panels and said outer panels are arranged in rows and each row is staggered with respect to the next adjoining row by half a panel length.

4. Insulation in accordance with claim I wherein said outer panels are staggered on all sides with respect to said inner panels.

5. A device as set forth in claim I, further comprising:

a container for storing or transporting liquid gas, said container having a spherical wall the outer surface of which lies against the inner surface of said inner panels.

6. Insulation in accordance with claim 1 wherein said inner and outer insulating panels are plastic.

7. Insulation in accordance with claim 1 wherein said rabbeted edges of said inner and said outer panels comprise flange projections on two adjacent edges and flange-receiving shoulders for receiving and interlocking with flange projections on the other two adjacent edges of adjoining panels.

8. Insulation in accordance with claim 7 wherein said fastening elements fit into said flange-receiving shoulders of the superjacent panel layer.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION 3,855,811 Dated December 24, 1974 Patent No.

Inventods) Sauerbrunn et a1 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

[73] Assignee: Rheinhold & Mahla GmbH.

Mannheim, Augusta-Anlage, Germany Column 2, line 21, "contrast" should read --contract-- Signed and sealed this 6th day of May 1975.

(SEAL) Attest:

' C. MARSHALL DANN RUTH C. MASON Commissioner of Patents Attesting Officer and Trademarks FORM PO-IOSO (10-69) 0375. :5 n u.s. GOVERNMENT PRINTING OFFICE I969 0-356-334

Claims (8)

1. Insulation for liquid gas containers comprising: a plurality of molded inner foamed synthetic insulating panels each having rabbeted edges, each having a fastening element at the center thereof projecting upwardly from approximately halfway through the thickness thereof and each having a forceaccepting element embedded in the center of each panel during molding thereof at approximately half the thickness of said panel; said inner insulating panels being adapted for arrangement on a gas container with each panel being staggered with respect to at least one of the next adjoining panels and interlocking therewith; a plurality of outer insulating panels having rabbeted edges; said outer insulating panels being adapted for arrangement on said inner insulating panels with each outer panel being staggered with respect to at least one of the next adjoining outer panels and interlocking therewith and each said outer panel being staggered with respect to said inner panels; and wherein said fastening elements of said inner panels fit into the rabbeted edges of said outer panels.
2. Insulation in accordance with claim 1 wherein said fastening element comprises a clamping screw and fastening prong which are linked to said force-accepting element. Pg,9
3. Insulation in accordance with claim 1 wherein said inner panels and said outer panels are arranged in rows and each row is staggered with respect to the next adjoining row by half a panel length.
4. Insulation in accordance with claim 1 wherein said outer panels are staggered on all sides with respect to said inner panels.
5. A device as set forth in claim 1, further comprising: a container for storing or transporting liquid gas, said container having a spherical wall the outer surface of which lies against the inner surface of said inner panels.
6. Insulation in accordance with claim 1 wherein said inner and outer insulating panels are plastic.
7. Insulation in accordance with claim 1 wherein said rabbeted edges of said inner and said outer panels comprise flange projections on two adjacent edges and flange-receiving shoulders for receiving and interlocking with flange projections on the other two adjacent edges of adjoining panels.
8. Insulation in accordance with claim 7 wherein said fastening elements fit into said flange-receiving shoulders of the superjacent panel layer.
US32839773 1972-07-06 1973-01-31 Insulation for liquid gas containers, especially spherical containers Expired - Lifetime US3855811A (en)

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DE19722233332 DE2233332B2 (en) 1972-07-06 1972-07-06

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US (1) US3855811A (en)
JP (1) JPS4937207A (en)
DE (1) DE2233332B2 (en)
ES (1) ES408121A1 (en)
FR (1) FR2191065A1 (en)
GB (1) GB1394109A (en)
NO (1) NO133284C (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948412A (en) * 1975-05-16 1976-04-06 The Dow Chemical Company Insulation of steel tanks
US3978632A (en) * 1974-11-11 1976-09-07 Friedrich Air Conditioning & Refrigeration Co. Foam plastics display unit
US4155482A (en) * 1975-11-03 1979-05-22 Owens-Corning Fiberglas Corporation Insulated cryogenic liquid container
US5429326A (en) * 1992-07-09 1995-07-04 Structural Laminates Company Spliced laminate for aircraft fuselage
US5502982A (en) * 1994-04-28 1996-04-02 Liquid Carbonic Industries Corporation Cryogenic tie pin
US6038867A (en) * 1998-07-31 2000-03-21 General Electric Company Wide multilayer insulating blankets for zero boiloff superconducting magnet
US20120012473A1 (en) * 2009-04-14 2012-01-19 Adnan Ezzarhouni Termination of the secondary membrane of an lng tank

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2527544B1 (en) * 1982-06-01 1987-01-09 Gaz Transport Waterproof and thermally insulating tank integrated into the supporting structure of a ship and the vessel comprising
JPS58186300U (en) * 1982-06-04 1983-12-10
JPS59188983U (en) * 1983-05-31 1984-12-14
GB2344409B (en) * 1998-12-02 2003-03-26 Lancaster Glass Fibre Ltd A boiler lining system
JP5783821B2 (en) * 2011-06-30 2015-09-24 ダウ化工株式会社 Thermal insulation structure of liquefied gas tank

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928565A (en) * 1955-09-06 1960-03-15 Thorpe Insulation Company Insulated structure
US3196622A (en) * 1963-02-04 1965-07-27 Texas Eastern Trans Corp Cryogenic storage tank
US3487971A (en) * 1968-05-01 1970-01-06 Beech Aircraft Corp Cryogenic tank supporting system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928565A (en) * 1955-09-06 1960-03-15 Thorpe Insulation Company Insulated structure
US3196622A (en) * 1963-02-04 1965-07-27 Texas Eastern Trans Corp Cryogenic storage tank
US3487971A (en) * 1968-05-01 1970-01-06 Beech Aircraft Corp Cryogenic tank supporting system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978632A (en) * 1974-11-11 1976-09-07 Friedrich Air Conditioning & Refrigeration Co. Foam plastics display unit
US3948412A (en) * 1975-05-16 1976-04-06 The Dow Chemical Company Insulation of steel tanks
US4155482A (en) * 1975-11-03 1979-05-22 Owens-Corning Fiberglas Corporation Insulated cryogenic liquid container
US5429326A (en) * 1992-07-09 1995-07-04 Structural Laminates Company Spliced laminate for aircraft fuselage
US5502982A (en) * 1994-04-28 1996-04-02 Liquid Carbonic Industries Corporation Cryogenic tie pin
US6038867A (en) * 1998-07-31 2000-03-21 General Electric Company Wide multilayer insulating blankets for zero boiloff superconducting magnet
US20120012473A1 (en) * 2009-04-14 2012-01-19 Adnan Ezzarhouni Termination of the secondary membrane of an lng tank
US9291308B2 (en) * 2009-04-14 2016-03-22 Gaztransport & Technigaz LNG container with a connecting device which connects a secondary impermeable barrier to a load bearing structure

Also Published As

Publication number Publication date
NO133284C (en) 1976-04-07
DE2233332A1 (en) 1974-01-24
GB1394109A (en) 1975-05-14
JPS4937207A (en) 1974-04-06
FR2191065A1 (en) 1974-02-01
ES408121A1 (en) 1975-10-01
DE2233332B2 (en) 1974-12-19
NO133284B (en) 1975-12-29

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