US2536019A - Floating roof tank - Google Patents

Floating roof tank Download PDF

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Publication number
US2536019A
US2536019A US626850A US62685045A US2536019A US 2536019 A US2536019 A US 2536019A US 626850 A US626850 A US 626850A US 62685045 A US62685045 A US 62685045A US 2536019 A US2536019 A US 2536019A
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Prior art keywords
roof
edge
shoe
tank
floating roof
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Expired - Lifetime
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US626850A
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John W Allen
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Chicago Bridge and Iron Co
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Chicago Bridge and Iron Co
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    • 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
    • B65D88/00—Large containers
    • B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
    • B65D88/42—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle
    • B65D88/46—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle with mechanical means acting on the seal

Definitions

  • This invention relates to a floating roof tank, and particularly to a seal for a floating roof tank for sealing the area between the edge of the roof and the inner surface of the tank shell.
  • the new seal comprises a shoe, preferably of metal, normally pressing against the inner surface of the shell and removably attached to the floating roof, and a seal section extending from the shoe to the roof.
  • spring means to aid in pressing the shoe against the shell and preferably a secondary seal that is normally held in sealing contact with the tank shell. The seal achieves a positive sealing action partially by its own weight, and partially by the spring means.
  • FIG. 1 is a fragmentary plan view of the floating roof tank embodying this invention
  • Fig. 2 is a fragmentary vertical section taken through the edge of the floating roof and the adjacent portion of the tank shell
  • Fig. 3 is a horizontal section taken along line 3-3 of Fig. 2.
  • the tank shown in the accompanying drawings comprises a shell IE! and a floating roof H positioned therein.
  • a seal comprising a flexible metal shoe l2 adapted to rest flat against the shell, an annular metal cover plate 13 attached to the topof the shoe l2 and held in generally horizontal position, and a flexible sealing strip l4 extending from the cover plate l3 to the top surface I5 of the roof II.
  • a secondary seal I6 comprising a looped fabric fastened to the cover plate It and pressing against the shell I0.
  • the flexible sealing strip l4 and secondary seal 16 are preferably made of a fabric impregnated with a flexible impervious material that is wear-resistant.
  • the seal is held in place by means of vertical bars I1 adapted to be held against the edge of behind a first bracket 24.
  • each bar I! is held in position on the edge of the roof by means of a base member 18 which may comprise an extending bottom edge of the roof, and each bar is held against lateral movement by means of spaced guide members IS.
  • the vertical bars I] are removably held in place against the edge of the roof by a pin 20 passing through the top of each vertical bar I1 and the top edge 2
  • the edge. of the roof is extended above the top surface 15 in order to provide the top portion 2L
  • Each pin 29 is held in place by means of a second, smaller pin 22 passing through the end.
  • each second bracket 25 is attached to the roof in upstanding position with each second bracket 25 being immediately Extending between each first bracket and each second bracket is a threaded rod 25 loosely held within holes 21 and 28 provided in the first and second brackets respectively.
  • the rod 25 is held within the second hole 28 by means of spaced collars 29 mounted on said threaded rod.
  • the rod 26 is also provided with a flaredend ti! on the other side of the first bracket '24 to prevent accidental displacement of the rod.
  • Mounted on the rod 26 is a threaded base member 3
  • a spring 32 extends from the base member 3! to the first bracket 24, and this spring is held in compression substantially concentrically to the rod26.'
  • the secondary seal it is mounted on the metal cover plate It adjacent the metal. shoe l2 by means of a plurality of spaced bolts 33 extending through the cover plate and the edge of the seal.
  • the top edge 34 of the shoe I2 is bent back from the shell and is fastened to the edge :35 of the cover plate It by means of a plurality of bolts 35 passing through the edge 34 of the shoe, a compression strip 31, and the edge 35 of the cover plate.
  • the flexible sealing strip M is attached to the metal covering plate I3 by means of a plurality of bolts 38 passing through the inner edge of the covering plate l3 and the top edge of the sealing strip I l.
  • the bottom edge of the sealing strip is fastened to the top surface 15 of the roof by means of a plurality of hooks 39.
  • the edge of the sealing strip is held by wedges 40 contacting the hooks 39 and wedging against a circular bar 4
  • the seal described herein is light in weight and easy to install, and provides a positive sealing action between the roof and the tank shell.
  • the removable support for the shoe makes erection easier and maintenance of the seal simple.
  • the shoe !2 is held in place against the shell ii] partially by its own weight and partially by the action of the spring 32 pressing the metal cover plate outwardly.
  • the spring 32 also serves to press the secondary shell I6 against the shell.
  • the compression of the spring may be varied by varying the distance of the threaded base member 3
  • the metal shoes [2 are ordinarily made in sections ,and adjoining sections are connected together by means of fabric strips 42 impregnated witha flexible impervious material. The edges of these strips are held in place by means of hooks 43, rods 44, and wedges 45 of the same nature those used in fastening the edge of the sealing strip 14 to the top surface i of the roof.
  • any other suitable fastening means may of course" be used.
  • the shoes were 9 feet long and 4 hanger bars were used, each spaced 2 feet from an end of the shoe.
  • the 4 bars were arranged in vertically aligned pairs, with each pair being substantially parallel to all the others.
  • crossed bracing rods 45 between two laterally adjacent hanger bars 23 In order to prevent lateral movement of the seal there were provided crossed bracing rods 45 between two laterally adjacent hanger bars 23. This bracing may be provided either on the top pair of hanger bars, the bottom pair of hanger bars, or on both pairs.
  • a liquid storage tank having a floating roof and a plurality of shoes adapted to slidably contact the inner side walls of the tank, an annular seal between the shoes and the roof, means for supporting said shoes against the tank wall comprising a plurality of pairs of substantially vertical guide members attached to the edge of the floating roof and extending downwardly into the space between the roof and the walls beneath the annular seal, a vertical bar held between each pair of guide members shoe supporting hangers attached to the shoe and attached to the vertical bars, and means for removably securing said bars to theroof, said means being connected to the roof and to the bars only at the upper edge of the roof.
  • annular seal comprises an annular metal cover plate attached to the top of the shoes, a secondary seal carried by the cover plate and pressing against the side Walls above the shoes a flexible sealing strip extending from the cover plate to theroof, a series of spaced brackets mounted on the cover plate, a series of second spaced brackets mounted in upstanding position around the edge of the roof adiacent said first brackets, a threaded rod extending between each of said first brackets and each of said second brackets and loosely held in said brackets, a threaded base member engaging the threads on said rod and located between said first and second brackets, a spring positioned around said rod and extending from the base member to said first bracket, said spring being adapted for compression between the base member and the first bracket.
  • sealing means comprising an annular metal cover plate attached to the top of the shoes and extending substantially horizontally inward toward the roof, a secondary seal carried by the cover plate and pressing against the side walls above the shoes, an annular flexible sealing strip extending from the cover plate to the roof, a series of spaced brackets mounted on the cover plate, a series of second spaced brackets mounted in upstanding position around the edge of the roof adjacent said first brackets, a threaded rod extending between each of said first brackets and each of said second brackets and loosely held in the brackets, stop means on each rod adapted to abut the second bracket, a threaded base member engaging the threads on said rods and located between said first and second brackets, a spring positioned around said rod and extending from the base member to said first bracket, said spring being adapted for compression between the base member and the first bracket

Description

J 2, 1951 J. w. ALLEN 2,536,019
FLOATING ROOF TANK Filed Nov. 5, 1945 Patented Jan. 2, 1951 UNITED STATES PATENT OFFICE FLOATING ROOF TANK John W. Allen, Chicago, Ill., assignor to Chicago Bridge & IronGompany, a corporation of Illi- 3 Claims. 1
This invention relates to a floating roof tank, and particularly to a seal for a floating roof tank for sealing the area between the edge of the roof and the inner surface of the tank shell.
Floating roof tanks for the storage of volatile liquids in which a roof is provided that floats on top of the liquid contents must have means for sealing the annular area between the edge of the roof and the tank shell. This is necessary in order to prevent evaporation of the tank contents and to prevent contamination with water, dirt, and the like. I have invented an improved seal that is light in weight and simple to install, and that provides a positive sealing action between the floating roof and the tank shell.
The new seal comprises a shoe, preferably of metal, normally pressing against the inner surface of the shell and removably attached to the floating roof, and a seal section extending from the shoe to the roof. There is also provided spring means to aid in pressing the shoe against the shell and preferably a secondary seal that is normally held in sealing contact with the tank shell. The seal achieves a positive sealing action partially by its own weight, and partially by the spring means.
The invention will be described as related to the embodiment shown in the accompanying drawings. Of the drawings Fig. 1 is a fragmentary plan view of the floating roof tank embodying this invention; Fig. 2 is a fragmentary vertical section taken through the edge of the floating roof and the adjacent portion of the tank shell; and Fig. 3 is a horizontal section taken along line 3-3 of Fig. 2.
The tank shown in the accompanying drawings comprises a shell IE! and a floating roof H positioned therein. Between the edge of the floating roof and the inner surface of the tank shell there is provided a seal comprising a flexible metal shoe l2 adapted to rest flat against the shell, an annular metal cover plate 13 attached to the topof the shoe l2 and held in generally horizontal position, and a flexible sealing strip l4 extending from the cover plate l3 to the top surface I5 of the roof II. There is also preferably provided a secondary seal I6 comprising a looped fabric fastened to the cover plate It and pressing against the shell I0. The flexible sealing strip l4 and secondary seal 16 are preferably made of a fabric impregnated with a flexible impervious material that is wear-resistant.
The seal is held in place by means of vertical bars I1 adapted to be held against the edge of behind a first bracket 24.
the floating roof and upwardly extending hanger bars 23 extending between the vertical bar 11 and the shoe (2. The hanger bars 23 are rotatably fastened to the vertical bar l1 and to the shoe l2, so that the weight of the shoe and attached sealing members will force the shoe and the secondary seal out against the shell. Each bar I! is held in position on the edge of the roof by means of a base member 18 which may comprise an extending bottom edge of the roof, and each bar is held against lateral movement by means of spaced guide members IS. The vertical bars I] are removably held in place against the edge of the roof by a pin 20 passing through the top of each vertical bar I1 and the top edge 2| of the roof. The edge. of the roof is extended above the top surface 15 in order to provide the top portion 2L Each pin 29 is held in place by means of a second, smaller pin 22 passing through the end.
On the top surface of the metal cover plate I3 there is provided a series of spaced brackets 24 attached to the plate. A series of second brackets 25 is attached to the roof in upstanding position with each second bracket 25 being immediately Extending between each first bracket and each second bracket is a threaded rod 25 loosely held within holes 21 and 28 provided in the first and second brackets respectively. The rod 25 is held within the second hole 28 by means of spaced collars 29 mounted on said threaded rod. The rod 26 is also provided with a flaredend ti! on the other side of the first bracket '24 to prevent accidental displacement of the rod. Mounted on the rod 26 is a threaded base member 3| engaging the threads of the rod 26 and located between the first bracket 24 and the second bracket 25. A spring 32 extends from the base member 3! to the first bracket 24, and this spring is held in compression substantially concentrically to the rod26.'
The secondary seal it is mounted on the metal cover plate It adjacent the metal. shoe l2 by means of a plurality of spaced bolts 33 extending through the cover plate and the edge of the seal. The top edge 34 of the shoe I2 is bent back from the shell and is fastened to the edge :35 of the cover plate It by means of a plurality of bolts 35 passing through the edge 34 of the shoe, a compression strip 31, and the edge 35 of the cover plate. The flexible sealing strip M is attached to the metal covering plate I3 by means of a plurality of bolts 38 passing through the inner edge of the covering plate l3 and the top edge of the sealing strip I l. The bottom edge of the sealing strip is fastened to the top surface 15 of the roof by means of a plurality of hooks 39. The edge of the sealing strip is held by wedges 40 contacting the hooks 39 and wedging against a circular bar 4| which presses against the edge of the sealing strip I 4.
The seal described herein is light in weight and easy to install, and provides a positive sealing action between the roof and the tank shell. The removable support for the shoe makes erection easier and maintenance of the seal simple. The shoe !2 is held in place against the shell ii] partially by its own weight and partially by the action of the spring 32 pressing the metal cover plate outwardly. The spring 32 also serves to press the secondary shell I6 against the shell. The compression of the spring may be varied by varying the distance of the threaded base member 3| from the first bracket 24.
The metal shoes [2 are ordinarily made in sections ,and adjoining sections are connected together by means of fabric strips 42 impregnated witha flexible impervious material. The edges of these strips are held in place by means of hooks 43, rods 44, and wedges 45 of the same nature those used in fastening the edge of the sealing strip 14 to the top surface i of the roof.
Any other suitable fastening means may of course" be used. In a typical installation the shoes were 9 feet long and 4 hanger bars were used, each spaced 2 feet from an end of the shoe. The 4 bars were arranged in vertically aligned pairs, with each pair being substantially parallel to all the others. In order to prevent lateral movement of the seal there were provided crossed bracing rods 45 between two laterally adjacent hanger bars 23. This bracing may be provided either on the top pair of hanger bars, the bottom pair of hanger bars, or on both pairs.
Having described my invention as related to one embodiment of the same, it is my intention that the invention be not limited by the details of description unless otherwise specified, but rather be construed broadly within its spirit and scope as set out in the accompanying claims.
I claim:
1. In a liquid storage tank having a floating roof and a plurality of shoes adapted to slidably contact the inner side walls of the tank, an annular seal between the shoes and the roof, means for supporting said shoes against the tank wall comprising a plurality of pairs of substantially vertical guide members attached to the edge of the floating roof and extending downwardly into the space between the roof and the walls beneath the annular seal, a vertical bar held between each pair of guide members shoe supporting hangers attached to the shoe and attached to the vertical bars, and means for removably securing said bars to theroof, said means being connected to the roof and to the bars only at the upper edge of the roof.
2, Apparatus of the character described in claim 1 in which said annular seal comprises an annular metal cover plate attached to the top of the shoes, a secondary seal carried by the cover plate and pressing against the side Walls above the shoes a flexible sealing strip extending from the cover plate to theroof, a series of spaced brackets mounted on the cover plate, a series of second spaced brackets mounted in upstanding position around the edge of the roof adiacent said first brackets, a threaded rod extending between each of said first brackets and each of said second brackets and loosely held in said brackets, a threaded base member engaging the threads on said rod and located between said first and second brackets, a spring positioned around said rod and extending from the base member to said first bracket, said spring being adapted for compression between the base member and the first bracket.
3. In a liquid storage tank having a floating roof, a plurality of shoes adapted to slidably contact the inner side walls of the tank and means for supporting said shoes against the side walls, sealing means comprising an annular metal cover plate attached to the top of the shoes and extending substantially horizontally inward toward the roof, a secondary seal carried by the cover plate and pressing against the side walls above the shoes, an annular flexible sealing strip extending from the cover plate to the roof, a series of spaced brackets mounted on the cover plate, a series of second spaced brackets mounted in upstanding position around the edge of the roof adjacent said first brackets, a threaded rod extending between each of said first brackets and each of said second brackets and loosely held in the brackets, stop means on each rod adapted to abut the second bracket, a threaded base member engaging the threads on said rods and located between said first and second brackets, a spring positioned around said rod and extending from the base member to said first bracket, said spring being adapted for compression between the base member and the first bracket.
JOHN W. ALLEN.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,463,268 Huff July 31, 1923 1,574,013 Wiggins Feb. 23, 1926 1,660,021 Wiggins Feb. 21, 1928 1,662,225 Wiggins Mar. 13, 1928 1,668,792 Wiggins May 8, 1928 1,673,984 Kuhl June 19, 1928 1,801,582 Wiggins Apr. 21, 1931 1,900,904 Berger Mar. 14, 1933 1,989,624 Matter Jan. 29, 1935 FOREIGN PATENTS Number Country Date 487,774 Great Britain June 24, 1938
US626850A 1945-11-05 1945-11-05 Floating roof tank Expired - Lifetime US2536019A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2754026A (en) * 1953-01-29 1956-07-10 John H Wiggins Sealing mechanism for floating tank roofs
US2790574A (en) * 1955-02-21 1957-04-30 Consani Gino Floating-roof type liquid storage tanks
DE1026239B (en) * 1955-10-19 1958-03-13 Dortmunder Union Brueckenbau Sealing device on floating covers
US2846108A (en) * 1954-10-07 1958-08-05 Southwest Welding & Mfg Compan Floating roof anti-turning device
DE1037968B (en) * 1956-03-01 1958-08-28 Mercantile Marine Engineering Floating roof waterproofing, especially for oil tanks
DE1108147B (en) * 1957-06-13 1961-05-31 Chicago Bridge & Iron Co Floating roof sealing for storage tanks
US2987215A (en) * 1955-08-15 1961-06-06 Ii William E Joor Variable volume storage tanks
US3204808A (en) * 1962-09-17 1965-09-07 Lacy Mfg Company Magnetic floating roof seal
US4036395A (en) * 1976-06-04 1977-07-19 Pacific Erectors Corporation Secondary sealing device for storage vessel having a floating roof
US4371090A (en) * 1980-11-03 1983-02-01 Gatx Tank Erection Corporation Secondary seal for floating roof storage tank
US5103992A (en) * 1990-04-18 1992-04-14 Hmt, Inc. Shoe seal for floating roof of storage tank, and method of installing same
US5284269A (en) * 1993-06-28 1994-02-08 Petrie Jack G Space saving double seal
US5321881A (en) * 1991-09-19 1994-06-21 Hmt, Inc. Method of installing a shoe seal for floating roof of storage tank
US5529200A (en) * 1993-06-16 1996-06-25 Chicago Bridge & Iron Technical Services Company Floating roof metallic shoe seal spring hanger system
US5667091A (en) * 1994-12-29 1997-09-16 Chicago Bridge & Iron Technical Services Company Mounting system for floating roof seals
WO2004060775A1 (en) 2002-12-16 2004-07-22 Chicago Bridge & Iron Company Spring-loaded secondary seal for floating-roof storage tank
US20050072782A1 (en) * 2002-12-16 2005-04-07 Chicago Bridge & Iron Company Spring-loaded secondary seal for floating-roof storage tank
WO2016184961A1 (en) 2015-05-21 2016-11-24 Basf Se Container for storing a liquid, and use thereof
US11548725B2 (en) 2013-03-15 2023-01-10 Industrial & Environmental Concepts, Inc. Cover systems, tank covering methods, and pipe retention systems

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1463268A (en) * 1919-07-21 1923-07-31 Huff Wilson Sylvester Fireproof tank
US1574013A (en) * 1924-04-30 1926-02-23 John H Wiggins Floating deck for liquid-storage tanks
US1660021A (en) * 1926-02-15 1928-02-21 John H Wiggins Liquid-storage tank
US1662225A (en) * 1923-03-26 1928-03-13 John H Wiggins Floating deck for liquid-storage tanks
US1668792A (en) * 1926-08-30 1928-05-08 John H Wiggins Liquid-storage tank
US1673984A (en) * 1926-12-11 1928-06-19 Standard Oil Co California Sealing construction for tanks
US1801532A (en) * 1929-06-14 1931-04-21 George M Schaff Shoe
US1900904A (en) * 1929-04-18 1933-03-14 Johns Manville Flexible wear-resisting sealing fabric and method of making the same
US1989624A (en) * 1933-07-03 1935-01-29 Standard Oil Co Floating roof for storage tanks
GB487774A (en) * 1936-11-24 1938-06-24 Harry Hedley Hollis Improvements in or relating to storage tanks for volatile spirits and the like

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1463268A (en) * 1919-07-21 1923-07-31 Huff Wilson Sylvester Fireproof tank
US1662225A (en) * 1923-03-26 1928-03-13 John H Wiggins Floating deck for liquid-storage tanks
US1574013A (en) * 1924-04-30 1926-02-23 John H Wiggins Floating deck for liquid-storage tanks
US1660021A (en) * 1926-02-15 1928-02-21 John H Wiggins Liquid-storage tank
US1668792A (en) * 1926-08-30 1928-05-08 John H Wiggins Liquid-storage tank
US1673984A (en) * 1926-12-11 1928-06-19 Standard Oil Co California Sealing construction for tanks
US1900904A (en) * 1929-04-18 1933-03-14 Johns Manville Flexible wear-resisting sealing fabric and method of making the same
US1801532A (en) * 1929-06-14 1931-04-21 George M Schaff Shoe
US1989624A (en) * 1933-07-03 1935-01-29 Standard Oil Co Floating roof for storage tanks
GB487774A (en) * 1936-11-24 1938-06-24 Harry Hedley Hollis Improvements in or relating to storage tanks for volatile spirits and the like

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2754026A (en) * 1953-01-29 1956-07-10 John H Wiggins Sealing mechanism for floating tank roofs
US2846108A (en) * 1954-10-07 1958-08-05 Southwest Welding & Mfg Compan Floating roof anti-turning device
US2790574A (en) * 1955-02-21 1957-04-30 Consani Gino Floating-roof type liquid storage tanks
US2987215A (en) * 1955-08-15 1961-06-06 Ii William E Joor Variable volume storage tanks
DE1026239B (en) * 1955-10-19 1958-03-13 Dortmunder Union Brueckenbau Sealing device on floating covers
DE1037968B (en) * 1956-03-01 1958-08-28 Mercantile Marine Engineering Floating roof waterproofing, especially for oil tanks
DE1108147B (en) * 1957-06-13 1961-05-31 Chicago Bridge & Iron Co Floating roof sealing for storage tanks
US3204808A (en) * 1962-09-17 1965-09-07 Lacy Mfg Company Magnetic floating roof seal
US4036395A (en) * 1976-06-04 1977-07-19 Pacific Erectors Corporation Secondary sealing device for storage vessel having a floating roof
US4371090A (en) * 1980-11-03 1983-02-01 Gatx Tank Erection Corporation Secondary seal for floating roof storage tank
US5103992A (en) * 1990-04-18 1992-04-14 Hmt, Inc. Shoe seal for floating roof of storage tank, and method of installing same
US5321881A (en) * 1991-09-19 1994-06-21 Hmt, Inc. Method of installing a shoe seal for floating roof of storage tank
US5529200A (en) * 1993-06-16 1996-06-25 Chicago Bridge & Iron Technical Services Company Floating roof metallic shoe seal spring hanger system
US5284269A (en) * 1993-06-28 1994-02-08 Petrie Jack G Space saving double seal
US5667091A (en) * 1994-12-29 1997-09-16 Chicago Bridge & Iron Technical Services Company Mounting system for floating roof seals
WO2004060775A1 (en) 2002-12-16 2004-07-22 Chicago Bridge & Iron Company Spring-loaded secondary seal for floating-roof storage tank
US20050072782A1 (en) * 2002-12-16 2005-04-07 Chicago Bridge & Iron Company Spring-loaded secondary seal for floating-roof storage tank
US7044322B2 (en) 2002-12-16 2006-05-16 Chicago Bridge & Iron Company Spring-loaded secondary seal for floating-roof storage tank
US7748555B2 (en) 2002-12-16 2010-07-06 Chicago Bridge & Iron Company Spring-loaded secondary seal for floating-roof storage tank
US11548725B2 (en) 2013-03-15 2023-01-10 Industrial & Environmental Concepts, Inc. Cover systems, tank covering methods, and pipe retention systems
WO2016184961A1 (en) 2015-05-21 2016-11-24 Basf Se Container for storing a liquid, and use thereof

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