US3795339A - Seal ring for a floating tank roof - Google Patents
Seal ring for a floating tank roof Download PDFInfo
- Publication number
- US3795339A US3795339A US00229874A US3795339DA US3795339A US 3795339 A US3795339 A US 3795339A US 00229874 A US00229874 A US 00229874A US 3795339D A US3795339D A US 3795339DA US 3795339 A US3795339 A US 3795339A
- Authority
- US
- United States
- Prior art keywords
- roof
- wall
- strip
- lateral
- fixed
- Prior art date
- 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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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
- 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
Definitions
- ABSTRACT -A seal ring for a floating tank roof where the roof has lateral side walls adjacent the tank walls.
- the seal includes a pair of rubber strips that can enclose a resilient material. One of the rubber strips forms a loop at its lower portion to receive a pulley cable or tube for positioning the seal.
- the present invention has for its object providing a seal ring for inside floating tank roofs, more particularly in the petroleum industry with a view to storing hydro-carbons, such as oil.
- seal rings usually produced for such types of tanks, a liquid, gaseous or spongy packing, enclosed in a flexible covering fixed to the floating roof is generally used.
- a covering made of a single strip or two strips, presses against the inside wall of the tank and moves vertically along that wall according to the variations in the level of the liquid contained in the tank.
- the upper part of the ring can be bolted either on suspension rods which are, themselves, bolted to the upper part of the roof, or on angle irons, themselves fixed by bolting or welding to the-wall of the roof.
- the lower part of the ring can be either free or bolted to angle irons themselves fixed to the lateral wall of the roof by bolting or welding, or bolted onto rigid rods fixed or made fast to the fixing means of the upper part of the ring or to the lower part of the floating roof.
- the fixing of the lower end of the ring generally sup ports the ring and the packing in their position so that they cannot over-balance duringthe raising and lower ing movements of the floating roof.
- the fixing of the lower part of the ring by one ofthe rod systems such as mentioned above makes it possible to provide support for pressing the covering against the lateral wall of the tank.
- the prior art has provided a number of seals for tanks, such as U.S. Pat. No. 3,055,533, French Pat. No. 1,344,122, British Pat. No. 882,189 and German Pat. No. 1,246,580.
- seal rings have, however, a certain number of disadvantages.
- the relatively complex design and structure of such devices for connecting the sealing ring gives rise to excessively long installing and removing periods, more particularly, for fixing the lower part, which is not readily accessible, making maintenance and repair operations on the tanks particularly complicated.
- the present invention enables such disadvantages to be overcome.
- the object of the presentinvention is to provide a sealing ring having a particularly simple design and structure, intended more particularly for floating roof hydro-carbon storage tanks, such a ring being very easy to install and remove, while providing perfect fluidtight sealing with respect to the hydro-carbons stored.
- the invention therefore, has for its object to provide a sealing device for a floating tank roof, intended, more particularly, for storing hydro-carbons, of the type comprising a flexible cover containing'a compressible material, fixed to the upper part of the roof and formed by two strips, a first of which presses against the inside wall of the tank, and the second of which presses against the lateral wall of the roof.
- the second strip being stretched substantially along the lateral wall of the roof has, at the level of the lower part of the roof, a closed loop in which an element intended for pressing the lower part of that second strip against the wall of the floating roof is engaged.
- FIG. 1 shows a storage tank 1 inside which a floating roof 2 is moved vertically according to the fluctuations in the level of the liquid stored (not illustrated).
- the seal device consists of a flexible covering 3, as an assembly, inside which a compressible material 4, consisting for example, of foam polyurethane,
- the covering 4 consists, for example, of two strips; a first strip 5 is stretched along the wall of the floating roof 2 and held at its lower part by rolling and welding round a tube 6; the lower end of the strip 5 is folded over then welded to the strip 5 to form a closed loop 15 in which the tube 6 is engaged.
- a second strip 7 is welded, at its lower part 8, to the strip 5 and presses laterally against the inside wall of the tank 1. Furthermore, the fixing of the upper parts of the two strips described .above on the floating roof 2 is ensured by means of bolts 9, through flat irons 10.
- Such strips are made of a plastic material, such as, nylon, coated with a covering substance which is inert with respect to hydro-carbons, in this case, polyurethane.
- the strip 5, folded back at its lower part to form the loop 15 surrounding the tube 6 and welded at 11 by using a high frequency welding technique, for example, is illustrated.
- the tube 6, made of plastic material is pressed against the outside wall of the floating roof by means of angle irons 12 having an L-shaped crosssection (FIG. 1) and welded at intervals on the wall of the floating roof. Notches 13 are formed in the lower part of the strip 5, forming the loop 15 opposite the angle irons 12.
- FIG. 2 also illustrates the lower part of the strip 7 welded to the strip 5, as well ss openings 14 provided in the upper part of the strip 5 and having the screws of the fixing bolts 9 (FIG. 1) fitted in them.
- the tube 6 has been illustrated with a circular cross-section; it can have a cross-section with a different shape and can also be solid or hollow. I
- FIG. 3 illustrating a varied embodiment of the invention
- the references identical'to those in FIGS. 1 and 2 designate the same elements.
- This embodiment differs from that the FIG. 1 in that the tube 6 is replaced by a cable 16.
- the holding of the cable 16 against the lateral wall of the floating roof 2 is effected, moreover, by pulling the cable 16 taut.
- One of the ends of the cable 16 is fixed by means of a spring 17 to a pulley 18 having a substantially horizontal axis welded to the wall of the roof at its lower part and on an angle iron such as 12.
- the fixing of the other end of the cable 16 is effectd, after having engaged the cable 16 on the pulley 18 so that it rises along the lateral wall of the roof 2, it being fixed to the upper part of the floating roof 2.
- This fixing is effected, here, by means of a pulley 19 and a spring 20.
- the ring which is the object of the invention can be used in all cases where excellent fluid-tight sealing must be provided between the wall of a tank and a floating roof. It is advantageously implemented in hydro-carbon storage tanks used in the petroleum industry.
- a fluid hydrocarbon storage tank or the like including a vertical cylindrical tank wall and horizontal floating roof transversely spanning the tank interior, said floating roof including an annular lateral wall facing said tank wall, and a sealing ring fixed to said lateral roof wall and contacting said tank wall for sealing said floating roof and said cylindrical tank wall, the improvement wherein: said sealing ring comprises a cover formed by first and second annular strips fixed at their upper edges commonly to said lateral roof wall, said first strip lying flush with said lateral roof wall and terminating in a closed loop at its lower edge, a circular reinforcing element within said loop and extending the full circumference of said lateral roof wall and means fixed to said lateral roof wall at circumferentially spaced locations and engaging said circular reinforcing element to maintain said first strip in contact with said lateral wall, said second strip being welded at its lower edge to said first trip intermediate of the top and bottom edges of said first strip, and a compressible material ring sealably enclosed within a cavity defined by said strip and maintaining said second strip in sealing contact with said
- a storage tank according to claim 1, wherein the loop is formed by folding the lower end of the first strip and welding that edge on the corresponding portion of the first strip.
- a storage tank according to claim 2 wherein the first strip has, at its lower part, spaced notches interrupting the closed loop, and said means fixed to said lateral roof wall at circumferentially spaced locations engage the circular reinforcing element at said notches.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Tents Or Canopies (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7106744A FR2127193A5 (it) | 1971-02-26 | 1971-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3795339A true US3795339A (en) | 1974-03-05 |
Family
ID=9072584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00229874A Expired - Lifetime US3795339A (en) | 1971-02-26 | 1972-02-28 | Seal ring for a floating tank roof |
Country Status (8)
Country | Link |
---|---|
US (1) | US3795339A (it) |
BE (1) | BE779313A (it) |
DE (1) | DE2208119A1 (it) |
FR (1) | FR2127193A5 (it) |
GB (1) | GB1342440A (it) |
IT (1) | IT950662B (it) |
LU (1) | LU64782A1 (it) |
NL (1) | NL7202403A (it) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3926332A (en) * | 1973-02-14 | 1975-12-16 | Nippon Kakokicompany Limited | Sealing structure for a liquid storage vessel having a floating head |
US4138032A (en) * | 1977-09-26 | 1979-02-06 | Chicago Bridge & Iron Company | Full secondary seal, wiper type, for a floating roof tank |
US4317528A (en) * | 1979-08-21 | 1982-03-02 | Mesa Industries, Inc. | Floating roof tank sealing methods and apparatus |
US4353478A (en) * | 1979-08-21 | 1982-10-12 | Clark William F | Vapor seal for floating roof tank |
DE3150498A1 (de) * | 1981-12-21 | 1983-06-30 | Ingenieurbüro Imhof GmbH, 6050 Offenbach | Vorrichtung zum verschluss des dampfraumes zwischen produktniveau und dichtkoerper einer ringspaltabdichtung zwischen behaelterwand und schwimmender abdeckung eines grossraumbehaelters |
US4397399A (en) * | 1981-09-08 | 1983-08-09 | Tank Services, Incorporated | Seal for floating roofs of storage tanks |
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 |
US20100258376A1 (en) * | 2009-04-14 | 2010-10-14 | Ward Mark W | Device to prevent noise in ladder rung assemblies |
CN104139931A (zh) * | 2014-08-09 | 2014-11-12 | 四川宏源德石化有限公司 | 一种外浮顶石油储罐一、二次密封空间防燃爆安全装置 |
US11548725B2 (en) | 2013-03-15 | 2023-01-10 | Industrial & Environmental Concepts, Inc. | Cover systems, tank covering methods, and pipe retention systems |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB937966A (en) * | 1960-11-21 | 1963-09-25 | John Henry Wiggins | Sealing mechanism for a tank for storing liquids |
US3154213A (en) * | 1959-06-18 | 1964-10-27 | Union Tank Car Co | Seal arrangement for floating roof |
US3426934A (en) * | 1966-12-20 | 1969-02-11 | Union Tank Car Co | Seal |
US3434619A (en) * | 1967-02-20 | 1969-03-25 | Pittsburgh Des Moines Steel | Floating roof seal |
-
1971
- 1971-02-26 FR FR7106744A patent/FR2127193A5/fr not_active Expired
-
1972
- 1972-02-14 BE BE779313A patent/BE779313A/xx unknown
- 1972-02-15 LU LU64782A patent/LU64782A1/xx unknown
- 1972-02-18 GB GB772772A patent/GB1342440A/en not_active Expired
- 1972-02-21 DE DE19722208119 patent/DE2208119A1/de not_active Withdrawn
- 1972-02-24 NL NL7202403A patent/NL7202403A/xx not_active Application Discontinuation
- 1972-02-25 IT IT67608/72A patent/IT950662B/it active
- 1972-02-28 US US00229874A patent/US3795339A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3154213A (en) * | 1959-06-18 | 1964-10-27 | Union Tank Car Co | Seal arrangement for floating roof |
GB937966A (en) * | 1960-11-21 | 1963-09-25 | John Henry Wiggins | Sealing mechanism for a tank for storing liquids |
US3426934A (en) * | 1966-12-20 | 1969-02-11 | Union Tank Car Co | Seal |
US3434619A (en) * | 1967-02-20 | 1969-03-25 | Pittsburgh Des Moines Steel | Floating roof seal |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3926332A (en) * | 1973-02-14 | 1975-12-16 | Nippon Kakokicompany Limited | Sealing structure for a liquid storage vessel having a floating head |
US4138032A (en) * | 1977-09-26 | 1979-02-06 | Chicago Bridge & Iron Company | Full secondary seal, wiper type, for a floating roof tank |
US4317528A (en) * | 1979-08-21 | 1982-03-02 | Mesa Industries, Inc. | Floating roof tank sealing methods and apparatus |
US4353478A (en) * | 1979-08-21 | 1982-10-12 | Clark William F | Vapor seal for floating roof tank |
US4397399A (en) * | 1981-09-08 | 1983-08-09 | Tank Services, Incorporated | Seal for floating roofs of storage tanks |
DE3150498A1 (de) * | 1981-12-21 | 1983-06-30 | Ingenieurbüro Imhof GmbH, 6050 Offenbach | Vorrichtung zum verschluss des dampfraumes zwischen produktniveau und dichtkoerper einer ringspaltabdichtung zwischen behaelterwand und schwimmender abdeckung eines grossraumbehaelters |
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 |
US20100258376A1 (en) * | 2009-04-14 | 2010-10-14 | Ward Mark W | Device to prevent noise in ladder rung assemblies |
US11548725B2 (en) | 2013-03-15 | 2023-01-10 | Industrial & Environmental Concepts, Inc. | Cover systems, tank covering methods, and pipe retention systems |
CN104139931A (zh) * | 2014-08-09 | 2014-11-12 | 四川宏源德石化有限公司 | 一种外浮顶石油储罐一、二次密封空间防燃爆安全装置 |
CN104139931B (zh) * | 2014-08-09 | 2016-08-17 | 威特龙消防安全集团股份公司 | 一种外浮顶石油储罐一、二次密封空间防燃爆安全装置 |
Also Published As
Publication number | Publication date |
---|---|
NL7202403A (it) | 1972-08-29 |
LU64782A1 (it) | 1973-01-05 |
DE2208119A1 (de) | 1972-08-31 |
BE779313A (fr) | 1972-08-14 |
GB1342440A (en) | 1974-01-03 |
IT950662B (it) | 1973-06-20 |
FR2127193A5 (it) | 1972-10-13 |
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