EP0080130B1 - Moyen d'étanchéité pour l'espace annulaire entre la paroi d'un réservoir et le toit flottant d'un grand réservoir de stockage - Google Patents

Moyen d'étanchéité pour l'espace annulaire entre la paroi d'un réservoir et le toit flottant d'un grand réservoir de stockage Download PDF

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Publication number
EP0080130B1
EP0080130B1 EP82110463A EP82110463A EP0080130B1 EP 0080130 B1 EP0080130 B1 EP 0080130B1 EP 82110463 A EP82110463 A EP 82110463A EP 82110463 A EP82110463 A EP 82110463A EP 0080130 B1 EP0080130 B1 EP 0080130B1
Authority
EP
European Patent Office
Prior art keywords
sealing
spring
annular gap
soft foam
tank wall
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
Application number
EP82110463A
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German (de)
English (en)
Other versions
EP0080130A1 (fr
Inventor
Heinrich Ing.Grad. Imhof
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.)
INGENIEURBURO IMHOF GmbH
Ingenieurbuero Imhof GmbH
Original Assignee
INGENIEURBURO IMHOF GmbH
Ingenieurbuero Imhof GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by INGENIEURBURO IMHOF GmbH, Ingenieurbuero Imhof GmbH filed Critical INGENIEURBURO IMHOF GmbH
Publication of EP0080130A1 publication Critical patent/EP0080130A1/fr
Application granted granted Critical
Publication of EP0080130B1 publication Critical patent/EP0080130B1/fr
Expired legal-status Critical Current

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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
    • B65D88/46—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
    • 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

  • the invention relates to a device for sealing the annular gap between the vertical container wall and the floating cover of a large-capacity container, in particular a floating roof tank or a fixed roof tank with an internal floating cover, consisting of a large number of narrow spring bands attached to one another at uniform intervals next to one another on the circumference of the floating cover and having their free ends resilient are directed against the tank wall, span the ring gap with elastic deflection and press an elastic sealing profile attached to their free ends along a circumferential line against the tank wall, the ring gap being closed by a sealing apron that runs around the entire ring gap between the sealing profile and the floating cover.
  • annular gap seals are mainly used for the storage of volatile, liquid refinery products and chemicals to avoid evaporation losses and the accumulation of dangerous vapors.
  • the annular gap between the vertical tank wall and floating ceiling required for the vertical movement of the floating cover must be closed by an elastic sealing element, which is able to compensate for operational changes in the annular gap width as well as severe out-of-roundness and bulges in the tank wall and thereby the escape of product vapors or the Prevent rainwater from entering as far as possible.
  • annular gap seal Another important task of the annular gap seal is to ensure that the free-floating cover is adequately centered, which is to ensure trouble-free vertical movement without local overloading or tilting.
  • the frictional forces emanating from the annular gap seal must not become so great that there is a risk of the floating cover getting caught or being flooded by stored product.
  • the annular gap seal should be able to exert a uniformly strong centering effect over the entire circumference of the tank, be able to easily compensate for deviations in the annular gap width by means of eccentricity, out-of-roundness and bumps with the help of sufficient spring travel, cover even smaller imperfections and unevenness of the tank wall by means of wide-area and elastic adjustment and as wear-resistant as possible have an outer shell.
  • the materials used should be extremely resistant, both to the storage media and to weather conditions.
  • Annular gap seals for floating roof tanks are usually subdivided into a primary seal and a secondary seal today, whereby the primary seal facing the stock product is intended to retain the majority of the product vapors and the secondary seal directed against the atmosphere, in addition to improving the overall sealing effect, is intended in particular to prevent the ingress of rainwater.
  • annular gap seals for indoor floating ceilings in fixed roof tanks only have the task of limiting product emissions.
  • Lip seals have the disadvantage that they only seal along a narrow and relatively stiff lip, with sharp bumps, e.g. B. vertical welds, can not be sealed and often the danger of everting, z. B. on horizontal welds.
  • Spring-reinforced rubber aprons are also relatively stiff, so they cannot adequately seal vertical weld seams and are also at risk of being turned inside out.
  • Resiliently pressed foam pads with an abrasion-resistant covering have the best chance of guaranteeing a seal with particular effectiveness and operational safety thanks to their high deformability, wide sealing surface and well-rounded outer shapes. Unsatisfactory in known designs of this type is the often insufficient corrosion resistance and long-term durability of the spring elements used and the resulting limitation of the possible spring travel.
  • leaf springs are provided as spring bands, which are arranged at large mutual distances, which necessitates the use of thick spring bands.
  • These thick spring bands are relatively stiff, offer considerable resistance to the elastic deformation and press the sealing profile at points onto the container wall.
  • the rigidity of the spring bands makes the assembly of this known annular gap seal very difficult.
  • the outer ends of the spring bands are pointed at an acute angle to the tank wall, which means that the hard sealing profile, which is only of relatively small cross-sectional dimensions, can get caught more easily when the floating cover moves vertically.
  • the known annular gap seal is designed only for the simultaneous primary and secondary sealing of a floating roof tank, the prestressing of the leaf spring legs lying up and down should be adjustable by a central fastening screw engaging in a vertical wall of the floating cover.
  • the attachment of the mounting holes required for this in the vertical wall of the floating cover is undesirable because such holes can cause leaks in the floating body.
  • the attachment points are no longer accessible after the sealing apron has been attached, so that later spring adjustments only appear possible after the apron has been removed.
  • annular gap seal (DE-A 3 007 389)
  • the annular gap between the tank wall and the floating roof is covered in the manner of conventional weather protection plates by rectangular spring plates with mutual lateral overlap and with elastic deflection.
  • curved sliding block strips made of hard plastics are provided as contact elements to the tank wall.
  • This type of annular gap cover does not meet today's requirements for improved sealing of the annular gap and is merely to be regarded as an improvement of the already known weather plates for deriving the precipitation falling into the annular gap.
  • the sealing apron that spans the entire annular gap is missing.
  • the overlapping spring plates are neither steam-proof nor watertight at their floating roof connection.
  • the sliding bodies made of solid plastics only form a narrow line of contact with the tank wall and cannot adapt to fine bumps (e.g. weld seams).
  • the mutual overlap of the spring plates also results in mutual hindrance, which prevents optimal adaptation to the tank wall.
  • the lower part of the foam blocks is immersed in the storage medium, penetrates into the foam and has the effect that the tank cannot be made ⁇ gas-free> even after emptying, since the foam releases the absorbed storage liquid only slowly.
  • the described primary seal cannot hold back the precipitation falling into the annular gap.
  • the invention has for its object to provide a preferably usable as a secondary seal for floating roof tanks and as an annular gap seal for indoor floating ceilings of fixed roof tanks, which avoids the disadvantages of the known designs, especially with relatively low frictional forces and uniform centering effect for the floating cover a maximum of flexibility, sealing effect and operational reliability with low corrosion sensitivity of the components used.
  • this object is achieved by the present invention in that a plurality of adjacent spring bands are connected at their free ends to a receiving profile piece which is open toward the tank wall to form a spring unit, and that the sealing profile is formed from a plurality of soft foam elements which lie against one another, around which the sealing apron is knocked against the tank wall, and that each soft foam element is pressed against the tank wall by a plurality of receiving profile pieces sitting closely next to one another.
  • the annular gap seal according to the invention has a permanently high spring elasticity and extremely good shape adaptation, as well as a uniform centering effect for the floating cover.
  • the extreme shape adaptation is thereby achieved that the spring bands and mounting profile pieces combined into separate spring units can adapt the soft-elastic outer sealing profile to the locally existing tank contour in a segment-independent manner, independently of the adjacent spring units, the soft-elastic outer sealing profile being able to bend in the spaces between the mounting profile pieces in every horizontal direction.
  • the wide and soft elastic pressure of the outer sealing body ensures a high sealing effect with low frictional forces. Due to the spring bands that run practically parallel to the tank wall due to their deflection and the voluminous, soft and rounded outer sealing body, the danger of everting is eliminated.
  • the individual spring straps are easily accessible without dismantling the sealing apron.
  • the arrangement is advantageously such that the receiving profile pieces have a substantially C-shaped cross-section and a flange which is approximately perpendicular to the profile opening and to which the free ends of the spring strips are fastened, and that the receiving profile pieces have a profile bend opposite the flange for claw-like mounting of the soft foam elements.
  • the cross-sectional design of the receiving profile pieces allows easy attachment of the individual soft foam elements to be joined into a ring, the flange which adjoins the profile opening approximately vertically allowing attachment to the free ends of the spring bands in such a way that the spring bands are aligned with these free ends practically parallel to the tank wall, whereby a considerable radially directed elasticity of the annular gap seal is achieved without the risk of being turned inside out or getting caught.
  • the claw-like holder is advantageous for attaching the soft foam elements.
  • the soft foam elements for use on a secondary seal are chamfered on their side facing the tank wall in such a way that they have the shape of an upward-looking blunt wedge when not pressed.
  • the chamfer ensures that even when the gap narrows, the upper edge of the outer sealing body is always pressed firmly onto the tank wall and a sufficiently wide sealing surface is created.
  • the lateral spacing of the receiving profile pieces is to be dimensioned such that, on the one hand, the soft foam elements are pressed against the tank wall as seamlessly as possible and that, on the other hand, mutual interference between the receiving profile pieces is avoided and the soft-elastic outer sealing body can bend freely at the spaces between the receiving profile pieces.
  • two to six adjacent spring bands are expediently fastened to a receiving profile piece.
  • two to six spring bands and a receiving profile piece form a spring unit.
  • the spring strips are made of stainless spring steel sheet and the receiving profile pieces are made of stainless steel sheet.
  • the annular gap seal 2 is used above a conventional primary seal, not shown.
  • the thin and closely spaced spring straps 6 are fastened by means of screws 7 and with the interposition of a terminal block 8.
  • the sealing apron 9 which runs endlessly around the entire annular gap, is fastened on the one hand to the receiving profile pieces 10, is knocked against the tank wall around the foam elements 14 and is fastened at the other end to the horizontal flange 5.
  • the spring strips 6 consist of approximately 1 mm thick and approximately 100 to 200 mm wide sheet metal strips made of stainless spring steel.
  • three spring bands 6 are combined to form a spring element by a receiving profile piece 10 with a C-shaped cross section.
  • the receiving profile pieces 10 have a flange 11 which is approximately perpendicular to the profile opening and to which the free ends of the spring strips 6 are fastened at 12 from the outside.
  • the spring strips 6 are connected to the receiving profile pieces 10 in such a way that a short end piece 13 of the spring strips protrudes into the C-profile and holds the foam elements 14 in a claw-like manner in cooperation with an opposite profile fold 15.
  • the foam elements 14, each passing through a plurality of receiving profile pieces 10 and made of a flexible polyurethane foam, have an approximately square, rectangular or rhombic cross section, for example the cross section shown in FIG. 3.
  • the foam elements 14 are at their court against the tank wall tete side with a chamfer 16, so that the shape of an upward blunt wedge is formed. This ensures that the outer sealing body always lies with its upper edge against the tank wall 1 even when the gap has narrowed and that the water running down the tank wall when it is raining is pushed away from the tank wall without a larger storage space being able to form above the seal.
  • the sealing apron 9 consists of a fabric-reinforced rubber material or plastic with high flexibility and abrasion resistance.
  • the sealing apron 9 is, in addition to the attachment to the floating roof 4 already described, attached to the rear of the receiving profile pieces 10 by means of terminal strips 17 at 18.
  • FIG. 2 shows the annular gap seal 2 'between the vertical container wall 1' and the inner floating ceiling 4 'of a fixed roof tank, the fill level of which is indicated by the level line 19.
  • Comparable components are designated by the reference numerals used for FIG. 1, which, however, are provided with an index line.
  • the spring bands 6 ' are bent downwards against the tank wall 1'.
  • the foam elements 14 ' have an approximately square cross section in the unpressed form.
  • the sealing apron 9 ' is clamped in at the connection point between the flange 11' and the spring strips 6 'by means of terminal strips 17', folded down around the foam elements 14 'and below the spring strips 6' on the outer edge flange 5 ' Inner floating ceiling 4 'fastened by screws 7' and terminal strips 8 '.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Building Environments (AREA)

Claims (9)

1. Dispositif d'étanchéité de l'espace annulaire (3, 3') entre la paroi verticale (1, 1') et la couverture flottante (4, 4') d'un grand réservoir de stockage, en particulier d'un réservoir à toit flottant ou d'un réservoir à toit fixe et couverture interne flottante, constitué par de nombreux feuillards à ressort (6, 6') fixés à intervalles réguliers sur la circonférence de la couverture flottante (4, 4'), dont les extrémités libres sont dirigées élastiquement vers la paroi (1, 1') du réservoir, qui couvrent l'espace annulaire (3, 3') avec flèche élastique et appliquent sur la paroi du réservoir un profilé d'étanchéité (14, 14') élastique, fixé sur leurs extrémités libres, l'espace annulaire étant fermé par une jupe d'étanchéité (9, 9') fixée sur toute la circonférence entre le profilé d'étanchéité (14,14') et la couverture flottante (4, 4'), ledit dispositif étant caractérisé en ce que:
- un tronçon de profilé de logement (10, 10') ouvert en direction de la paroi (1) du réservoir réunit les extrémités libres de plusieurs feuillards à ressort (6, 6') voisins en une unité élastique;
- le profilé d'étanchéité est constitué par plusieurs éléments en mousse souple (14, 14') juxtaposés, sur lesquels la jupe d'étanchéité (9, 9') est repliée et appliquée sur la paroi du réservoir; et
-chaque élément en mousse souple (14,14') est appliqué sur la paroi du réservoir par plusieurs tronçons contigus du profilé de logement (10,10').
2. Dispositif selon revendication 1, caractérisé en ce que les tronçons du profilé de logement (10, 10') présentent une section sensiblement en C et une bride (11, 11') se raccordant à peu près perpendiculairement à l'ouverture du profil et sur laquelle sont fixées les extrémités libres des feuillards à ressort (6, 6'); et les tronçons du profilé de logement présentent un repli (15,15') du profilé en regard de la bride pour la fixation comme par des griffes des éléments en mousse souple (14, 14').
3. Dispositif selon les revendications 1 et 2, caractérisé en ce que les éléments en mousse souple (14) destinés à l'emploi dans une garniture secondaire comportent sur le côté de la section dirigée vers la paroi (1) du réservoir un biseau (16) tel qu'ils présentent en l'absence de compression la forme d'une cale tronquée vers le haut.
4. Dispositif selon une quelconque des revendications 1 à 3, caractérisé en ce que les extrémités libres de deux à six feuillards à ressort (6, 6') voisins sont fixées sur un tronçon du profilé de logement (10, 10').
5. Dispositif selon une quelconque des revendications 1 à 4, caractérisé en ce que les feuillards à ressort (6, 6') sont réalisés dans une tôle d'acier à ressort inoxydable et les tronçons du profilé de logement (10, 10') dans une tôle d'acier inoxydable.
6. Dispositif selon une quelconque des revendications 1 à 5, caractérisé en ce que la jupe d'étanchéité (9) entourant les éléments en mousse sou- pie (14) est fixée sur la face arrière des tronçons du profilé de logement (10) avec interposition de réglettes de serrage (17).
7. Dispositif selon une quelconque des revendications 1 à 5, caractérisé en ce que la jupe d'étanchéité (9) entourant les éléments en mousse souple (14') est encastrée au point d'assemblage des feuillards à ressort (6') et des tronçons du profilé de logement (10') avec interposition de réglettes de serrage (17').
8. Dispositif selon une quelconque des revendications 1 à 7, caractérisé en ce que les éléments en mousse souple (14, 14') sont en polyuréthanne avec une section carrée, rectangulaire ou en losange.
9. Dispositif selon une quelconque des revendications 1 à 4 et 8, caractérisé en ce que les éléments en mousse souple surdimensionnés sont maintenus par action de force dans les tronçons du profilé de logement.
EP82110463A 1981-11-19 1982-11-12 Moyen d'étanchéité pour l'espace annulaire entre la paroi d'un réservoir et le toit flottant d'un grand réservoir de stockage Expired EP0080130B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3145753 1981-11-19
DE19813145753 DE3145753A1 (de) 1981-11-19 1981-11-19 Vorrichtung zur abdichtung des ringspalts zwischen behaelterwand und schwimmender abdeckung eines grossraumbehaelters

Publications (2)

Publication Number Publication Date
EP0080130A1 EP0080130A1 (fr) 1983-06-01
EP0080130B1 true EP0080130B1 (fr) 1987-04-22

Family

ID=6146665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82110463A Expired EP0080130B1 (fr) 1981-11-19 1982-11-12 Moyen d'étanchéité pour l'espace annulaire entre la paroi d'un réservoir et le toit flottant d'un grand réservoir de stockage

Country Status (2)

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EP (1) EP0080130B1 (fr)
DE (2) DE3145753A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615458A (en) * 1985-08-05 1986-10-07 Chicago Bridge & Iron Company Floating roof tank with rim space seal
NL8900103A (nl) * 1989-01-17 1990-08-16 Piet Hugo Alphonsus Van Der Ku Afdichtingssysteem voor een opslagtank met zgn. drijvend tankdak.
FR2776274A1 (fr) * 1998-03-17 1999-09-24 Emmanuel Schiffmann Dispositif pour le stockage sous-marin des effluents d'un gisement petrolier sous-marin
US6247607B1 (en) * 1998-12-18 2001-06-19 Hmt Inc. Low profile secondary seal
DE19959359A1 (de) 1999-12-09 2001-07-05 Imhof Ingbuero Gmbh Vorrichtung zum Abdichten eines Ringspalts
DE102004001206B4 (de) * 2004-01-06 2006-05-04 Heinrich Imhof Vorrichtung zum Abdichten des Ringspalts zwischen einer Behälterinnenwand eines für eine Flüssigkeit bestimmten vertikalen Rundbehälters und einer schwimmenden Abdeckung
DE102016100649B4 (de) * 2016-01-15 2021-12-30 Kompoferm Gmbh Thermischer Energiespeicher in Form eines Flachbodentanks
CN115924330B (zh) * 2022-12-20 2023-07-04 河北珠峰仪器仪表设备有限公司 一种储罐内壁与浮盘全封闭装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437125A (en) * 1944-09-09 1948-03-02 Hammond Iron Works Floating roof for tanks
US2571817A (en) * 1947-04-09 1951-10-16 Stacey Brothers Gas Constructi Seal for fluid containers
GB1445996A (en) * 1973-11-02 1976-08-11 Greengate Ind Polymers Ltd Floating roofs for liquid storage tanks
CH634793A5 (en) * 1979-03-06 1983-02-28 Huber+Suhner Ag Floating tank seal

Also Published As

Publication number Publication date
DE3145753A1 (de) 1983-05-26
EP0080130A1 (fr) 1983-06-01
DE3276107D1 (en) 1987-05-27

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