US3926332A - Sealing structure for a liquid storage vessel having a floating head - Google Patents

Sealing structure for a liquid storage vessel having a floating head Download PDF

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Publication number
US3926332A
US3926332A US423532A US42353273A US3926332A US 3926332 A US3926332 A US 3926332A US 423532 A US423532 A US 423532A US 42353273 A US42353273 A US 42353273A US 3926332 A US3926332 A US 3926332A
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United States
Prior art keywords
core member
longitudinal
sealing structure
end portions
outer core
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US423532A
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English (en)
Inventor
Chikashi Okamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Kakoki Co Ltd
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Nippon Kakoki Co Ltd
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Publication date
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Publication of US3926332A publication Critical patent/US3926332A/en
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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
    • B65D88/50—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle with resilient foam or stuffed seal
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/921—Closure or weather strip seal

Definitions

  • a sealing structure for use in a liquid storage vessel [52] U-S. Cl. 220/226; 220/2l6;.220/222; Such as an oil Storage tank having a floating head or 51 I C1 277/226 277/229 roof, the sealing structure comprising a hollow resil- E A :33 21 2 22 35 ient core of generally loop form, which core has a sub- 1 Searc stantlally arcuate cross section and is allowed to con- 220 ⁇ 216-227; 277/ 232 tract or expand in cross section when subjected to stress when the floatin head is moved relative to the [56] Reierences C'ted body of the vessel. g
  • the present invention relates generally to a liquid storage vessel with an unsecured top and specifically to an aboveground gas-tight oil storage tank having a floating head or roof. More specifically, the present invention is concerned with a sealing arrangement to be used in the oil storage tank of the particular type for hermetically sealing the tank between the tank body and the floating head.
  • Gas-tightness and durability are essentials of oil storage tanks and accordingly the principal requirements for the sealing arrangement of the oil storage tank of the described type are a uniform and constant pressure between the tank body and the floating head, responsiveness to the movement of the floating head relative to the tank body, and resistance to wear and abrasion resulting primarily from the friction between the contact surfaces of the tank body and the sealing structure. If the sealing pressure between the tank body and the floating head is deficient, gaps may be produced between the inner peripheral surface of the tank body and the rim of the head although the sealing structure may be subject to lesser wear and abrasion that will result in a prolonged service life of the sealing structure.
  • Oil vapor will therefore escape and, in some cases, oil itself may leak from the tank through such gaps, causing not only a considerable amount of loss of the stored oil but the danger of a conflagration or explosion if a spark happens to be produced in the neighborhood of the leaks as in the event of an earthquake. If, conversely, the sealing pressure is excessive, complete sealing of the tank may be achieved and the relative movement between the tank body and the floating head may be accommodated to satisfactorily by the sealing arrangement but the wear and abrasion of the sealing structure will be accelerated resulting in a shortened service life of the sealing arrangement.
  • an object of the present invention to provide an improved sealing structure for use in a liquid storage vessel having a floating head so as to achieve complete sealing between the body and the floating head of the vessel.
  • a general object of the present invention to provide an aboveground gas-tight liquid storage vessel having a floating head which is hermetically sealed from the body of the vessel by an improved sealing arrangement adapted to provide increased gastightness and durability of the storage vessel as a whole and accordingly enhanced assurance of safety required under any local regulations for the prevention of a conflagration or explosion of the vessel in the event of an earthquake or any other disaster.
  • a sealing structure comprising a resilient core including an elongated inner core member having a substantially rectangular cross section and substantially parallel inner and outer longitudinal surfaces and an elongated outer core member having a substantially arcuate cross section projecting outwardly away from the outer longitudinal surface of the inner core member and substantially parallel upper and lower longitudinal ends respectively secured to the upper and lower longitudinal ends of the outer longitudinal surface of the inner core member, the outer core member being initially fromed as a substantially flat strip and being thereafter forcibly deformed into a configuration having the aforesaid arcuate cross section, and a flexible covering member which hermetically encloses the core therewithin and which is adapted for being slidably pressed partly between the inner longitudinal surface of the inner core member and an outer peripheral surface of the floating head and partly between the projecting outer longitudinal surface of the outer core member and and inner peripheral surface of the liquid storage vessel.
  • the core may further include upper and lower resilient elongated members having respective upper and lower longitudinal ends respectively secured to upper and lower longitudinal portions of the outer longitudinal surface of the inner core member and respective outer longitudinal surfaces which are secured at their upper and lower end portions to upper and lower end portions, respectively, of the inner longitudinal surface of the outer core member, the resilient elongated members having respective lower and upper free longitudinal end portions which are spaced apart from each other and which are at least in part resiliently forced against the inner longitudinal surface of the outer core member.
  • the core may still further include upper and lower intermediate strips of resilient material which are at least partly in slidable contact between the upper and lower longitudinal surface of the inner core member and outer surfaces of the lower and upper free longitudinal end portions of the upper and lower resilient elongated members, respectively, and which have respective upper and lower longitudinal end portions respectively secured to the weld between the outer core member and the upper resilient elongated member and the weld between the outer core member and the lower resilient elongated member.
  • the inner and outer core members and the upper and lower resilient elongated members are preferably formed of a foam thermoplastic resin such as, for example, polyurethane while the upper and lower intermediate strips may be formed of any one of the known thermoplastic resins.
  • FIG. 1 is a fragmentary perspective view partially in cross section, of a core forming part of a preferred embodiment of the sealing structure according to the present invention
  • FIG. 2 is a cross sectional view of the embodiments of the sealing structure which is in a condition installed in an oil storage tank having a floating head;
  • FIG. 3 is a fragmentary cross sectional view of the core of the sealing structure in the installed condition.
  • FIG. 4 is a fragmentary perspective view showing partially in cross section, the configuration of part of the core of the sealing structure which is spread out into the form of an endless belting so as to show a process which may be used to obtain the formation illustrated in FIG. 1.
  • the core designated in its entirety by reference numeral 10
  • the core includes an inner elongated core member 12 and an elongated outer core member 14.
  • the inner core member 12 has a substantially rectangular cross section and accordingly substantially parallel inner and outer surfaces.
  • the core 10 further comprises a pair of, upper and lower, internal wedge members 18 and 18 which extend along upper and lower portions, respectively, of the inner surface of the outer core member 14.
  • the upper internal wedge member 18 is bonded or otherwise secured at an upper end portion of its outer surface to an upper end portion of the inner surface of the outer core member 14 as indicated at Q and is further secured at its upper longitudinal end to the upper end portion of the inner surface of the inner core member 12 as indicated at R.
  • the lower internal wedge member 18' is secured at a lower longitudinal end portion of its outer surface to a lower end portion of the inner peripheral surface of the outer core member 14 as indicated at Q and is further secured at its lower longitudinal end to the lower end portion of the inner surface of the inner core member 12 as indicated at R.
  • These upper and lower internal wedge members 18 and 18 have lower and upper free end portions, respectively, which are at least in part resiliently forced against the inner surface of the outer core member 14 and which are spaced apart from each other in vertical directions
  • the lower and upper free end portions of the upper and lower internal wedge members 18 and 18, respectively are reduced in thickness toward their ends so that each of the wedge members 18 and 18 has a generally wedge-shaped cross section which is curved over the inner surface of the outer core member 14 as shown.
  • the inner and outer core members 12 and 14 and the internal wedge members 18 and 18' are formed of light-weight resilient plastic material such as foamed thermoplastic material a typical example of which is polyurethane foam.
  • the core 10 having the construction above described may be placed in use as is but, for the reasons to be explained, the core may further comprise, as shown, a pair of, upper and lower, intermediate strips 20 and 20, respectively, of a flexible plastic material which is preferably heterogeneous to the material forming the members 12, 14, 18 and 18.
  • the upper intermediate strip 20 is interposed between the upper portion of the inner surface of the outer core member 14 and the outer surface of the free end portion of the upper inter nal wedge member 18 and is bonded or otherwise secured at its upper longitudinal end to the weld line between the outer core member 14 and the upper internal wedge member 18.
  • the lower intermediate strip 20 is interposed between the lower portion of the inner surface of the outer core member 14 and the outer surface of the free end portion of the lower internal wedge member 18 and is bonded or otherwise secured at its lower longitudinal end to the weld line between the outer core member 14 and the lower internal wedge member 18.
  • the intermediate strips 20 and 20 are thus partly in slidable contact between the inner surface of the outer core member 14 and the outer surfaces of the free end portions of the upper and lower strips 20 & 20, respectively intermediate strips.
  • the 20 and 20' are herein shown as projecting beyond the free ends of the internal wedge members 18 and 18, respectively, but, where desired, they may be substantially coextensive with or concealed benind the internal wedge members 18 and 18.
  • FIG. 2 illustrates a sealing structure incorporating the core 10 having the above described construction.
  • the core 10 is enclosed or wrapped in flexible covering members 22 and 22' which are securely connected together by suitable" fastening means 24 which are shown as comprising a clamping nut 24a and a'bolt 24b.
  • the covering members 22 and 22' are usually formed of rubber coated cloth.
  • the sealing structure thus arranged is mounted on an oil storage'ta'nk which is shown in phantom in FIG. 2 as consisting of 'a tank body 26 and a'floating head 28.
  • the tank body 26 stores therein oil or any otherliquid of, usually, an inflammable property'and the floating head 28 floats on the surface'of oil; Topermit movement of the floating head'28 relative tothe tank body 26, the head 28 has a rim 28a which is so-sized as to provide an appropriate allowance'between the inner peripheral surface of the tank body 26 and the rim 28a of the head 28.
  • the core of the sealing structure should therefore be so arranged that, when the core is in a free or relaxed condition which is'free from stress, the overall widthof the core or, in other words, the distance between the inner'surface of the inner core member 12 and the outer end of theouter-core member 14 is significantly larger than the amount of clearance between tank body 26 and the floating head 28.
  • the core.10 complete with the covering members 22 and 22 is forced between the inner peripheral surface of the tank body 26 and the rim 28a of the floating head 28 so that the outer core member 14 is caused to contract toward the outer surface of the inner core member 12 against the resiliency of the material forming the loop portion 14.
  • the outer surface of the outer core member 14 is consequently partly flattened and is tightly pressed against the inner peripheral surface of the tank body 26 through the covering member 22 while the inner surface of the inner core member 12 is fast on the rim 28a of the floating head 28 through the other covering member 22'.
  • the upper and lower internal wedge members 18 and 18 are tightly forced toward the internal surfaces of the outer core member 14 across the upper and lower intermediate strips and 20, respectively, thereby adding to the forces that act to press the outer core member 14 against the inner peripheral surface of the tank body 26.
  • the upper and lower end portions of the outer core member 14 are deformed to create certain angles 0 between the outer surfaces of the particular portions of the outer core member 14 and horizontal planes at the upper and lower ends of the inner core member 12 as seen in FIG. 3 so that the upper and lower portions of the outer core member 14 are forcefully urged upwardly and downwardly, respectively, as indicated by arrows F in FIG. 3.
  • the forces F will provide sufficient resistance to upward and downward deformation of the core and to bending or compressive stresses imparted to the core as a result of the movement of the floating head 28 relative to the tank body 26.
  • the outer core member 14 When, thus, the outer core member 14 is deformed under stress, the inner surface of the outer core member 14 and the outer surfaces of the internal wedge members 18 and 18' are moved in opposed directions relative to the intermediate strips 20 and 20' and, since, the wedge members 18 and 18' are urged against the intermediate strips 20 and 20', the inner surface of the outer core member 14 and the outer surfaces of the free end portions of the internal wedge members 18 and 18 are caused to-slide on the opposite surfaces of the intermediate strips 20 and 20', respectiv ely.
  • the outer core'member 14 is in this manner prevented from being subjected'to undue stresses when theco're member 14 is moved or deformed relative to the internal wedge members 18 and 18.
  • Members 12, 14, 18 and 18' are first formed separately each in a flat strip' form and are thereafter secured to each other, in a manner illustrated in FIG. 4.
  • the outer core member 14 of flat strip form has width which is so selected to provide a desired radius of ourvature when deformed into a configuration having an arcuate cross section shown in FIG. 1.
  • a pair of wedge members 18 and 18 each of the flat strip form are then secured at Q and Q, respectively, to the upper and lower longitudinal end portions of the inner surface of the outer core member 14.
  • the internal wedge members l8 and 18 have free end portions which are reduced in thickness toward their respective ends and which are appreciably spaced apart from the inner surface of the outer core member 14 as illustrated.
  • a pair of relatively thin strips 20 and 20' are then interposed between the inner surface of the outer core member 14 and the outer surfaces of the respective free end portions of the wedge members 18 and 18', respectively.
  • the strips 20 and 20 are secured to the welds between the outer core member 14 and the wedge members 18 and 18 so as to be loosely sandwiched between the ring-shaped member 14 and the free end portions of the wedge-shaped members 18 and 18.
  • the outer core member 14 complete with the wedge members 18 and 18 and the strips 20 and 20 attached thereto is then forcibly deformed outwardly into a configuration having a generally arcuate cross section and the outer core member 14 and the wedge members, 18 and 18 are secured at their respective upper and lower edges to upper and lower longitudinal end portions of an outer surface of an inner core member 12.
  • a sealing structure for use in a liquid storage vessel having a floating head comprising a core including an elongated inner core member of elastic material having a substantially rectangular cross section and substantially parallel inner and outer longitudinal surfaces and an elongated outer core member of elastic material having a substantially arcuate cross section projecting outwardly away from the outer longitudinal surface of the inner core member, said outer core member having substantially parallel upper and lower longitudinal ends respectively secured to the upper and lower longitudinal ends of the outer longitudinal surface of the inner core member to form a continuous cavity throughout the length of said core, said outer core member being initially formed separately from said inner core member as a substantially flat elongated strip and being thereafter forcibly deformed into a configuration having said arcuate cross section, and a flexible covering member hermetically enclosing said core therewithin and slidably pressed between the inner longitudinal surface of said inner core member and an outer peripheral surface of said floating head and partly between the projecting outer longitudinal surface of said outer core member and an inner peripheral surface of said liquid storage vessel.
  • said core further includes upper and lower resilient elongated members having respective upper and lower longitudinal ends respectively secured to upper and lower longitudinal portions of the outer longitudinal surface of said inner core member and respective outer longitudinal surfaces which are secured at their upper and lower end portions to upper and lower end portions, respectively, of the inner longitudinal surface of said outer core member, said resilient elongated members having respective lower and upper free longitudinal end portions which are spaced apart from each 8 other and which are at least in part resiliently forced against the inner longitudinal surface of said outer core member.
  • said core further includes upper and lower intermediate strips of resilient material which are at least partly in slidable contact between the upper and lower longitudinal portions, respectively, of the inner longitudinal surface of said inner core member and outer surfaces of said lower and upper free longitudinal end portions of said upper and lower resilient elongated members, respectively, and which have respective upper and lower longitudinal end portions respectively secured to the junction between the outer core member and said upper resilient elongated member and the junction between the outer core member and said lower resilient elongated member.
  • a sealing structure as claimed in claim 2 in which the free end portions of said upper and lower resilient elongated members are reduced in thickness toward their respective lower and upper ends to form a wedgeshape.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)
US423532A 1973-02-14 1973-12-10 Sealing structure for a liquid storage vessel having a floating head Expired - Lifetime US3926332A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48017497A JPS5145327B2 (enrdf_load_stackoverflow) 1973-02-14 1973-02-14

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US3926332A true US3926332A (en) 1975-12-16

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US (1) US3926332A (enrdf_load_stackoverflow)
JP (1) JPS5145327B2 (enrdf_load_stackoverflow)
DE (1) DE2404662A1 (enrdf_load_stackoverflow)
IT (1) IT999937B (enrdf_load_stackoverflow)
SE (1) SE397077B (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014454A (en) * 1975-10-28 1977-03-29 Greengate Industrial Polymers Limited Floating roofs for liquid storage tanks
US4126243A (en) * 1977-10-11 1978-11-21 Chicago Bridge & Iron Company Tank floating roof seal
US4244487A (en) * 1979-04-02 1981-01-13 Ultraflote Corporation Floating cover having pivotally connected flotation pontoons
WO1984000058A1 (en) * 1982-06-14 1984-01-05 Dow Chemical Co Resilient gasket having auxiliary resiliency means
US4493430A (en) * 1982-10-04 1985-01-15 Chicago Bridge & Iron Company Floating roof seal using a coil spring
US6027123A (en) * 1997-09-10 2000-02-22 Cbw Transport Services, Inc. Tank piston with improved seal and wiper
WO2001050043A1 (en) * 1999-12-30 2001-07-12 Transportation Leasing Corp. Tank piston with improved seal and wiper
US20050252091A1 (en) * 2004-05-13 2005-11-17 Ku Ja K Device for and method of preventing noise from door window glass for vehicles
US10443726B2 (en) * 2015-02-08 2019-10-15 John B. Nobil Suspension seal
US11548725B2 (en) 2013-03-15 2023-01-10 Industrial & Environmental Concepts, Inc. Cover systems, tank covering methods, and pipe retention systems

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910209A (en) * 1953-08-18 1959-10-27 Walter K Nelson Sealer strips
US3043468A (en) * 1960-02-23 1962-07-10 Gen Am Transport Sealing mechanisms for storage tanks
US3119511A (en) * 1962-06-08 1964-01-28 Gen Am Transport Sealing mechanisms for storage tanks
US3135415A (en) * 1962-01-23 1964-06-02 Dorcon Inc Floating roof seal
US3136444A (en) * 1962-01-19 1964-06-09 Chicago Bridge & Iron Co Resilient seal for floating roof tank
US3228702A (en) * 1961-11-02 1966-01-11 Union Tank Car Co Inflatable seal for floating roof
US3333725A (en) * 1963-07-15 1967-08-01 Chiyoda Chem Eng Construct Co Floating cover and sealing means for liquid storage tank
US3338454A (en) * 1964-02-24 1967-08-29 Dorcon Inc Secondary seal for floating roof tanks
US3372831A (en) * 1965-04-13 1968-03-12 Olin Mathieson Seal for floating deck
US3373891A (en) * 1965-04-06 1968-03-19 Helmerich & Payne Seal for floating tank roof
US3795339A (en) * 1971-02-26 1974-03-05 Joint Francais Seal ring for a floating tank roof

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910209A (en) * 1953-08-18 1959-10-27 Walter K Nelson Sealer strips
US3043468A (en) * 1960-02-23 1962-07-10 Gen Am Transport Sealing mechanisms for storage tanks
US3228702A (en) * 1961-11-02 1966-01-11 Union Tank Car Co Inflatable seal for floating roof
US3136444A (en) * 1962-01-19 1964-06-09 Chicago Bridge & Iron Co Resilient seal for floating roof tank
US3135415A (en) * 1962-01-23 1964-06-02 Dorcon Inc Floating roof seal
US3119511A (en) * 1962-06-08 1964-01-28 Gen Am Transport Sealing mechanisms for storage tanks
US3333725A (en) * 1963-07-15 1967-08-01 Chiyoda Chem Eng Construct Co Floating cover and sealing means for liquid storage tank
US3338454A (en) * 1964-02-24 1967-08-29 Dorcon Inc Secondary seal for floating roof tanks
US3373891A (en) * 1965-04-06 1968-03-19 Helmerich & Payne Seal for floating tank roof
US3372831A (en) * 1965-04-13 1968-03-12 Olin Mathieson Seal for floating deck
US3795339A (en) * 1971-02-26 1974-03-05 Joint Francais Seal ring for a floating tank roof

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014454A (en) * 1975-10-28 1977-03-29 Greengate Industrial Polymers Limited Floating roofs for liquid storage tanks
US4126243A (en) * 1977-10-11 1978-11-21 Chicago Bridge & Iron Company Tank floating roof seal
US4244487A (en) * 1979-04-02 1981-01-13 Ultraflote Corporation Floating cover having pivotally connected flotation pontoons
WO1984000058A1 (en) * 1982-06-14 1984-01-05 Dow Chemical Co Resilient gasket having auxiliary resiliency means
US4493430A (en) * 1982-10-04 1985-01-15 Chicago Bridge & Iron Company Floating roof seal using a coil spring
US6027123A (en) * 1997-09-10 2000-02-22 Cbw Transport Services, Inc. Tank piston with improved seal and wiper
US6325384B1 (en) * 1997-09-10 2001-12-04 Transportation Leasing Corporation Tank piston with improved seal and wiper
WO2001050043A1 (en) * 1999-12-30 2001-07-12 Transportation Leasing Corp. Tank piston with improved seal and wiper
US20050252091A1 (en) * 2004-05-13 2005-11-17 Ku Ja K Device for and method of preventing noise from door window glass for vehicles
US7313888B2 (en) * 2004-05-13 2008-01-01 Kia Motors Corporation Device for and method of preventing rattling of door window glass for vehicles
US11548725B2 (en) 2013-03-15 2023-01-10 Industrial & Environmental Concepts, Inc. Cover systems, tank covering methods, and pipe retention systems
US10443726B2 (en) * 2015-02-08 2019-10-15 John B. Nobil Suspension seal

Also Published As

Publication number Publication date
JPS49106004A (enrdf_load_stackoverflow) 1974-10-08
JPS5145327B2 (enrdf_load_stackoverflow) 1976-12-03
DE2404662A1 (de) 1974-08-22
SE397077B (sv) 1977-10-17
IT999937B (it) 1976-03-10

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