EP0084770B1 - Drain arrangement for precipitations from a vertical inside wall of a floating roof tank - Google Patents

Drain arrangement for precipitations from a vertical inside wall of a floating roof tank Download PDF

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Publication number
EP0084770B1
EP0084770B1 EP83100026A EP83100026A EP0084770B1 EP 0084770 B1 EP0084770 B1 EP 0084770B1 EP 83100026 A EP83100026 A EP 83100026A EP 83100026 A EP83100026 A EP 83100026A EP 0084770 B1 EP0084770 B1 EP 0084770B1
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EP
European Patent Office
Prior art keywords
water
layers
tank wall
tank
wall
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Expired
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EP83100026A
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German (de)
French (fr)
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EP0084770A1 (en
Inventor
Heinrich Ing.Grad. Imhof
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INGENIEURBURO IMHOF GmbH
Ingenieurbuero Imhof GmbH
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INGENIEURBURO IMHOF GmbH
Ingenieurbuero Imhof GmbH
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Priority to AT83100026T priority Critical patent/ATE13652T1/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
    • B65D88/46—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

Definitions

  • the invention relates to a device for removing the rainwater from the vertical inner wall of a floating roof tank, consisting of an annular scraper element which is pressed resiliently against the tank wall above conventional annular gap seals or weather plates.
  • annular gap between vertical tank wall and floating roof required for the trouble-free vertical movement of the floating roof must be closed by an elastic sealing element that 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 the escape of product vapors or penetration to prevent rainwater as much as possible.
  • annular gap seals on floating roof tanks are usually divided into a primary seal and a secondary seal, with the primary seal facing the stored product being 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, also to prevent the ingress of rainwater.
  • the rainwater falling against the inner wall of the tank under driving rain cannot be drained off from the weather plates, especially since the ends of the weather plates directed towards the tank wall are usually rounded, so that the weather plates cannot get stuck to the tank wall or the coating of the inner wall of the tank can damage when the floating roof moves upwards.
  • constructions which start from the aforementioned weather plates (US 4,116,358), or narrow spring legs (DE-A-23 58 636) as supports and with the aid of a sealing apron and one which closes the entire annular gap width endlessly above or below the weather plates or spring legs
  • Endless profile seals attached to the ends of the weather plates or spring legs represent a real secondary seal with good emission reduction and drainage of the precipitation falling into the annular gap.
  • the water film on the tank wall caused by driving rain cannot be removed effectively by these constructions either.
  • the invention was therefore based on the object of developing a water-stripping element which is able to interrupt the water film running down a vertical tank wall, to pull the water towards itself and to discharge it at a suitable point.
  • This element should be able to be attached above known secondary seals or weather plates.
  • the water-stripping element should be sufficiently elastic and vapor-tight from the product side, so that it can also perform the function of a sealing body for limiting the steam emissions in addition to the safe removal of the water film.
  • a conventional above Annular gap seals or weather plates resiliently pressed against the tank wall, consist of a layered pack of elastic materials, which are built up alternately in the vertical direction from water-absorbing and permeable layers and from water-impermeable layers, the upper and lower cover layers consisting of water-impermeable layers and the entire
  • the cross-section of the pack forms a rhomboid, so that when pressed against the tank wall, the individual layers are directed at an acute angle against the tank wall and each end of the layer comes into full contact with the tank wall, and that the stripper pack, which is made up of individual pieces, forms a closed ring short receiving profile pieces held and pressed by a plurality of individually acting spring elements against the tank wall, the vertical webs of the receiving profile pieces are perforated, so that the water absorbed can drain here.
  • the water-permeable layers consist of materials with a felt, fleece-like or fibrous or otherwise absorbent and water-permeable structure. Suitable for this are, for example, needle felt or needle fleece made of corrosion, weather and putresistant plastics.
  • the water-impermeable layers are advantageously produced by applying a rubber coating or an elastic plastic mass between the water-permeable layers. This gives the entire package the required strength and elasticity.
  • the top and bottom of the pack are also formed from water-impermeable layers, the bottom being given a particularly thick rubber coating or coating, so that the entire pack is vapor-tight from below.
  • the wiper pack which is made up of individual pieces to form a closed ring, is advantageously held in short receiving profile pieces and pressed against the tank wall by a large number of individually acting spring elements.
  • the receiving profile pieces are perforated on their vertical webs, so that the water absorbed can drain off here.
  • the water film running down the inner wall of the tank is first cut up by the wiper pack. Part of the water is drained directly from the wall via the top cover layer of the pack. The remaining amount of water penetrates into the water-permeable layers of the pack, is forcibly guided away from the tank wall by the water-impermeable layers and emerges from the perforation of the receiving profile pieces.
  • the weather plates or the apron of the secondary seal which are located below the wiper pack, conduct the water to the floating roof.
  • the number of layers and total thickness of the wiper pack are to be dimensioned so that even in the event of extreme rainfall, the lowest, water-permeable layer only has to drain small amounts of water. By interposing the water-impermeable layers, the water-permeable layer underneath cannot be moistened from above and thus retains its full water-absorbing effect.
  • Fig. 1 the operation of the wiper pack described according to the invention is shown.
  • the scraper pack generally designated by the reference number 2
  • the water-permeable layers 3 consist of plastic needle felt
  • the water-impermeable layers 4 are produced by applying a rubber-elastic plastic mass.
  • the water film 6 running down the tank wall 1 is cut up when it hits the wiper pack 2. Part of the water is already diverted from the tank wall by the top cover layer of the pack. The rest of the water film gets into the gap between the tank wall and the wiper pack.
  • the water-permeable layers 3 gradually suck the remaining water film from the tank wall.
  • the water-impermeable layers 4 prevent mutual moistening of the water-absorbing layers, so that the layer underneath in each case retains its full suction effect and, on the other hand, the water absorbed in the individual layers is forcibly diverted to the rear of the wiper pack.
  • the lower cover layer 5 of the wiper pack is particularly thick and at the same time acts as a sealing element to limit product emissions.
  • Fig. 2 shows a perspective sectional view of a secondary seal on a floating roof tank with the wiper packing described according to the invention as an external contact element to the tank wall, which at the same time fulfills the function of a profile seal.
  • Comparable components are with those used for Fig. 1 Reference numbers designated, but which are provided with an index line.
  • the wiper pack 2 'sits non-positively in short, C-shaped receiving profile pieces 7, which are pressed against the tank wall by narrow spring strips 9.
  • the secondary sealing apron 10 is permanently connected, which spans the entire annular gap 11 and is fastened together with the spring bands 9 to the outer, upper edge of the floating roof 12.
  • the C-shaped receiving profile pieces 7 are perforated 8 on their vertical webs, so that the water absorbed by the tank wall can escape here and is discharged above the secondary sealing apron 10 to the swimming pool.
  • FIG 3 shows the wiper pack described according to the invention in connection with conventional weather plates.
  • the wiper pack 2 is attached to the upper end of the weather plates 9" by means of Z-shaped receiving profile pieces 7 "and is directed at an acute angle against the tank wall 1".
  • the water emerging at the perforation 8 "of the Z-shaped receiving profile pieces 7" is discharged via the weather plates 9 "to the floating roof 12".

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Cleaning In General (AREA)

Abstract

In an arrangment for removal of precipitation from the vertical inner wall 1 of a tank having a floating roof, a water stripping element 2 is provided which interrupts the water film 6, running down the inner wall, absorbs the water and removes it at a suitable point. For this purpose, the stripping element 2 consists of a layered unit of elastic materials which are constructed in the vertical direction alternately of water absorbing and water permeable layers 3 and of water impermeable layers 4. The upper and the lower layers consist of water impermeable layers. The unit forms in the cross-section a rhomboid so that the individual layers 3, 4 are pressed at an acute angle towards the tank wall and each individual layer comes with its end face in full contact with the tank wall. The stripping element is combined of individual pieces to a closed ring which is held by the receiving elements and is pressed against the tank wall by spring elements.

Description

Die Erfindung betrifft eine Vorrichtung zur Entfernung des Niederschlagswassers von der senkrechten Innenwand eines Schwimmdachtanks, bestehend aus einem oberhalb herkömmlicher Ringspaltabdichtungen oder Wetterblechen federnd gegen die Tankwand gedrückten, ringförmigen Abstreifelement.The invention relates to a device for removing the rainwater from the vertical inner wall of a floating roof tank, consisting of an annular scraper element which is pressed resiliently against the tank wall above conventional annular gap seals or weather plates.

Zur Vermeidung von Verdunstungsverlusten und der Ansammlung gefährlicher Dämpfe werden leichtflüchtige, flüssige Raffinerieprodukte überwiegend in Schwimmdachtanks gelagert. Der für die störungsfreie Vertikalbewegung des Schwimmdaches erforderliche Ringspalt zwischen senkrechter Tankwand und Schwimmdach muß hierbei durch ein elastisches Dichtelement verschlossen werden, welches in der Lage ist, betriebsbedingte Änderungen der Ringspaltbreite sowie starke Unrundheiten und Beulen der Tankwand auszugleichen und das Entweichen von Produktdämpfen bzw. das Eindringen von Niederschlagswasser möglichst weitgehend zu verhindern. Üblicherweise werden heute Ringspaltabdichtungen an Schwimmdachtanks in eine Primärdichtung und eine Sekundärdichtung unterteilt, wobei die dem Lagerprodukt zugewendete Primärdichtung den Großteil der Produktdämpfe zurückhalten soll und die gegen die Atmosphäre gerichtete Sekundärdichtung neben der Verbesserung der Gesamtabdichtwirkung auch das Eindringen von Niederschlagswasser verhindern soll.To avoid evaporation losses and the accumulation of dangerous vapors, volatile, liquid refinery products are mostly stored in floating roof tanks. The annular gap between vertical tank wall and floating roof required for the trouble-free vertical movement of the floating roof must be closed by an elastic sealing element that 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 the escape of product vapors or penetration to prevent rainwater as much as possible. Today, annular gap seals on floating roof tanks are usually divided into a primary seal and a secondary seal, with the primary seal facing the stored product being 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, also to prevent the ingress of rainwater.

Während man jedoch bisher das Eindringen kleinerer Niederschlagsmengen in das Lagerprodukt tolerierte, da sich der Großteil der Raffinerieprodukte und Wasser von Natur aus leicht trennen lassen, ist man inzwischen an möglichst vollständiger Abschirmung gegen Niederschlagswasser interessiert. Für eine Reihe heute wichtiger Lagerprodukte ist das Eindringen von Niederschlagswasser produktschädlich. Daneben wird durch die wässrige Phase die Korrosion im Tankbodenbereich verstärkt. Ein weiterer Nachteil besteht in den unvermeidlichen Produktverlusten und dem Reinigungsaufwand bei Abtrennung des angesammelten Wassers.So far, however, the penetration of smaller amounts of precipitation into the storage product has been tolerated, since the majority of the refinery products and water can be easily separated by nature, in the meantime one is interested in the most complete possible protection against rainwater. The penetration of rainwater is harmful to a number of important storage products today. In addition, the aqueous phase increases corrosion in the tank bottom area. Another disadvantage is the inevitable product losses and the cleaning effort when separating the accumulated water.

Die bisher bekannten Sekundärdichtungen und Wettershutzeinrichtungen sind dazu geeignet, die direkt in den Ringspalt einfallenden Niederschläge abzuleiten. Der bei Schlagregen die Tankinnenwand herunterlaufende Wasserfilm konnte mit diesen Mitteln jedoch nicht wirkungsvoll entfernt werden.The previously known secondary seals and weather protection devices are suitable for deriving the precipitation falling directly into the annular gap. However, the water film running down the inner wall of the tank during driving rain could not be removed effectively with these agents.

Es ist allgemein bekannt, zur Ableitung der direkt in den Ringspalt zwischen Tankwand und Schwimmdach einfallenden Niederschläge sogenannte Wetterbleche einzusetzen. Hierbei wird am äußeren, oberen Rande des Schwimmdaches eine Vielzahl schmaler, sich schuppenartig überlappender Bleche mit Steigung zur Tankwand hin befestigt, wobei die freien Enden der Wetterbleche die Tankwand leicht berühren. Das gegen die Wetterbleche einfallende Niederschlagswasser wird zum Schwimmdach hin abgeleitet (DE-A-23 20 066, DE-A-19 21 667). Die Verwendung von Wetterblechen muß jedoch heute als technisch überholt angesehen werden. Wetterbleche haben nur einen minimalen Einfluß bei der angestrebten Begrenzung der Dampfemission. Das unter Schlagregen gegen die Tankinnenwand einfallende Niederschlagswasser kann von den Wetterblechen nicht abgeleitet werden, zumal die gegen die Tankwand gerichteten Enden der Wetterbleche meist abgerundet sind, damit die Wetterbleche bei Aufwärtsbewegung des Schwimmdaches an der Tankwand nicht festhaken oder die Beschichtung der Tankinnenwand beschädigen können.It is generally known to use so-called weather plates to derive the precipitation falling directly into the annular gap between the tank wall and the floating roof. Here, on the outer, upper edge of the floating roof, a multiplicity of narrow, scale-like overlapping sheets are attached with a slope to the tank wall, the free ends of the weather sheets slightly touching the tank wall. The rainwater falling against the weather plates is drained off to the floating roof (DE-A-23 20 066, DE-A-19 21 667). However, the use of weather plates has to be regarded as technically outdated today. Weather plates have only a minimal influence on the desired limitation of steam emissions. The rainwater falling against the inner wall of the tank under driving rain cannot be drained off from the weather plates, especially since the ends of the weather plates directed towards the tank wall are usually rounded, so that the weather plates cannot get stuck to the tank wall or the coating of the inner wall of the tank can damage when the floating roof moves upwards.

Desweiteren sind Konstruktionen bekannt, die von vorgenannten Wetterblechen (US 4.116.358), oder schmalen Federschenkeln (DE-A-23 58 636) als Stütze ausgehen und mit Hilfe einer oberhalb oder unterhalb der Wetterbleche oder Federschenkel die gesamte Ringspaltbreite endlos verschließenden Dichtungsschürze und einer an den Enden der Wetterbleche oder Federschenkel befestigten, endlosen Profildichtung eine echte Sekundärdichtung mit guter Emissionsminderung und Ableitung der in den Ringspalt einfallenden Niederschläge darstellen. Der bei Schlagregen entstehende Wasserfilm an der Tankwand kann aber durch diese Konstruktionen ebenfalls nicht wirkungsvoll entfernt werden.Furthermore, constructions are known which start from the aforementioned weather plates (US 4,116,358), or narrow spring legs (DE-A-23 58 636) as supports and with the aid of a sealing apron and one which closes the entire annular gap width endlessly above or below the weather plates or spring legs Endless profile seals attached to the ends of the weather plates or spring legs represent a real secondary seal with good emission reduction and drainage of the precipitation falling into the annular gap. The water film on the tank wall caused by driving rain cannot be removed effectively by these constructions either.

Weiterhin sind Konstruktionen bekannt, bei denen eine dickwandige Gummischürze mit eingearbeiteten Blattfedern als endlose Manchette den Ringspalt unter elastischer Durchbiegung überspannt (DE-A-28 32 978). Als nachteilig zeigte sich, daß diese Manchette bei Aufwärtsbewegung des Schwimmdaches umstülpen kann und in diesem Zustand keine abstreifende Wirkung für das die Tankwand herunterlaufende Niederschlagswasser besitzt.Furthermore, constructions are known in which a thick-walled rubber apron with incorporated leaf springs as an endless cuff spans the annular gap with elastic deflection (DE-A-28 32 978). It turned out to be disadvantageous that this sleeve can turn inside out when the floating roof moves upwards and in this state has no scraping effect for the rainwater running down the tank wall.

Es zeigte sich, daß die wasserabstreifende Wirkung der durch Formanpassung und Anpreßdruck wirkenden Sekundärdichtungen bedingt durch feine Unebenheiten und den Rostbelag an der Tankwand sowie durch die Kohäsion und Kapillarwirkung des Wasserfilmes, begrenzt ist.It was found that the water-wiping effect of the secondary seals, which are due to shape adaptation and contact pressure, is limited due to fine unevenness and the rust on the tank wall, as well as the cohesion and capillary action of the water film.

Der Erfindung lag daher die Aufgabe zugrunde, ein wasserabstreifendes Element zu entwickeln, welches in der Lage ist, den an einer senkrechten Tankwand herunterlaufenden Wasserfilm zu unterbrechen, das Wasser an sich zu ziehen und an geeigneter Stelle abzuführen. Dieses Element sollte oberhalb bekannter Sekundärdichtungen oder Wetterblechen angebracht werden können. Im ldealfall sollte das wasserabstreifende Element ausreichend elastisch und von der Produktseite her dampfdicht sein, sodaß es neben der sicheren Entfernung des Wasserfilmes auch die Funktion eines Dichtkörpers zur Begrenzung der Dampfemissionen erfüllen kann.The invention was therefore based on the object of developing a water-stripping element which is able to interrupt the water film running down a vertical tank wall, to pull the water towards itself and to discharge it at a suitable point. This element should be able to be attached above known secondary seals or weather plates. In the ideal case, the water-stripping element should be sufficiently elastic and vapor-tight from the product side, so that it can also perform the function of a sealing body for limiting the steam emissions in addition to the safe removal of the water film.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein oberhalb herkömmlicher Ringspaltabdichtungen oder Wetterblechen federnd gegen die Tankwand gedrücktes, ringförmiges Abstreifelement aus einer geschichteten Packung elastischer Materialien besteht, welche in vertikaler Richtung abwechselnd aus wasseraufnehmenden und -durchlässigen Schichten und aus wasserundurchlässigen Schichten aufgebaut ist, wobei die obere und untere Deckschicht aus wasserundurchlässigen Schichten bestehen und die gesamte Packung im Qerschnitt einen Rhomboid bildet, sodaß bei Andrücken an die Tankwand die einzelnen Schichten im spitzen Winkel gegen die Tankwand gerichtet sind und jede einzelne Schicht mit ihrer Stirnseite vollen Kontakt zur Tankwand bekommt, und daß weiterhin die aus Einzelstücken zu einem geschlossenen Ring aneinandergesetzte Abstreiferpackung in kurzen Aufnahmeprofilstücken gehalten und durch eine Vielzahl einzeln wirkender Federelemente gegen die Tankwand gedrückt wird, wobei die senkrechten Stege der Aufnahmeprofilstücke perforiert sind, sodaß das aufgenommene Wasser hier abfließen kann.The object is achieved in that a conventional above Annular gap seals or weather plates, resiliently pressed against the tank wall, consist of a layered pack of elastic materials, which are built up alternately in the vertical direction from water-absorbing and permeable layers and from water-impermeable layers, the upper and lower cover layers consisting of water-impermeable layers and the entire The cross-section of the pack forms a rhomboid, so that when pressed against the tank wall, the individual layers are directed at an acute angle against the tank wall and each end of the layer comes into full contact with the tank wall, and that the stripper pack, which is made up of individual pieces, forms a closed ring short receiving profile pieces held and pressed by a plurality of individually acting spring elements against the tank wall, the vertical webs of the receiving profile pieces are perforated, so that the water absorbed can drain here.

Die wasserdurchlässigen Schichten bestehen aus Materialien mit filz-, vlies- oder faserartiger oder sonstwie saugfähiger und wasserdurchlässiger Struktur. Hierfür eignen sich beispielsweise Nadelfilz oder Nadelvlies aus korrosions-, witterungs- und fäulnisbeständigen Kunststoffen.The water-permeable layers consist of materials with a felt, fleece-like or fibrous or otherwise absorbent and water-permeable structure. Suitable for this are, for example, needle felt or needle fleece made of corrosion, weather and putresistant plastics.

Die wasserundurchlässigen Schichten werden vorteilhafterweise durch Aufbringen einer Gummierung oder einer elastischen Kunststoffmasse zwischen den wasserdurchlässigen Schichten hergestellt. Hierdurch erhält die gesamte Packung die erforderliche Festigkeit und Elastizität.The water-impermeable layers are advantageously produced by applying a rubber coating or an elastic plastic mass between the water-permeable layers. This gives the entire package the required strength and elasticity.

Deckseite und Unterseite der Packung werden ebenfalls aus wasserundurchlässigen Schichten gebildet, wobei die Unterseite eine besonders dicke Gummierung oder Beschichtung erhält, sodaß die gesamte Packung von unten her dampfdicht ist.The top and bottom of the pack are also formed from water-impermeable layers, the bottom being given a particularly thick rubber coating or coating, so that the entire pack is vapor-tight from below.

Die aus Einzelstücken zu einem geschlossenen Ring aneinandergesetzte Abstreiferpackung wird vorteilhafterweise in kurzen Aufnahmeprofilstücken gehalten und durch eine Vielzahl einzeln wirkender Federelemente gegen die Tankwand gedrückt. Die Aufnahmeprofilstücke sind an ihren senkrechten Stegen perforiert, sodaß das aufgenommene Wasser hier abfließen kann.The wiper pack, which is made up of individual pieces to form a closed ring, is advantageously held in short receiving profile pieces and pressed against the tank wall by a large number of individually acting spring elements. The receiving profile pieces are perforated on their vertical webs, so that the water absorbed can drain off here.

Der die Tankinnenwand herunterlaufende Wasserfilm wird zunächst von der Abstreiferpackung zerteilt. Ein Teil des Wassers wird über die obere Deckschicht der Packung direkt von der Wand abgeführt. Die restliche Wassermenge dringt in die wasserdurchlässigen Schichten der Packung ein, wird durch die wasserundurchlässigen Schichten zwangsweise von der Tankwand weggeführt und tritt an der Perforation der Aufnahmeprofilstücke aus. Die unterhalb der Abstreiferpackung angeordneten Wetterbleche bzw. die Dichtungsschürze der Sekundärdichtung leiten das Wasser zum Schwimmdach hin ab.The water film running down the inner wall of the tank is first cut up by the wiper pack. Part of the water is drained directly from the wall via the top cover layer of the pack. The remaining amount of water penetrates into the water-permeable layers of the pack, is forcibly guided away from the tank wall by the water-impermeable layers and emerges from the perforation of the receiving profile pieces. The weather plates or the apron of the secondary seal, which are located below the wiper pack, conduct the water to the floating roof.

Anzahl der Schichten und Gesamtdicke der Abstreiferpackung sind so zu bemessen, daß selbst bei extremen Niederschlagsmengen die unterste, wasserdurchlässige Schicht nur noch geringe Wassermengen abführen muß. Durch Zwischenschaltung der wasserundurchlässigen Schichten wird erreicht, daß die jeweils darunterliegende wasserdurchlässige Schicht von oben her nicht befeuchtet werden kann und somit ihre volle wasseraufnehmende Wirkung behält.The number of layers and total thickness of the wiper pack are to be dimensioned so that even in the event of extreme rainfall, the lowest, water-permeable layer only has to drain small amounts of water. By interposing the water-impermeable layers, the water-permeable layer underneath cannot be moistened from above and thus retains its full water-absorbing effect.

Die erfindungsgemäß beschriebene Abstreiferpackung für Ringspaltabdichtungen an Schwimmdachtanks bietet folgende Vorteile :

  • - Wirkungsvolle Entfernung des Wasserfilmes von der Tankinnenwand und damit Verhinderung des Wassereintrages in den Tank,
  • - Reduzierung der Produkt-Emission,
  • - Schutz der Tankinnenbeschichtung vor Beschädigung durch Wetterbleche,
  • - Schutz gegen Verschleiß der Wetterbleche durch Reibung an der Tankwand.
The wiper pack for annular gap seals on floating roof tanks described according to the invention offers the following advantages:
  • - Effective removal of the water film from the inside wall of the tank and thus preventing water from entering the tank,
  • - reduction of product emissions,
  • - Protection of the inside of the tank from damage by weather plates,
  • - Protection against wear of the weather plates due to friction on the tank wall.

Weitere Einzelheiten werden nachfolgend anhand der zeichnerischen Darstellung von Ausführungsbeispielen erläutert.Further details are explained below on the basis of the graphic representation of exemplary embodiments.

In Fig. 1 ist die Wirkungsweise der erfindungsgemäß beschriebenen Abstreiferpackung dargestellt. Die allgemein mit der Bezugszahl 2 bezeichnete Abstreiferpackung wird durch eine nicht dargestellte Andrückvorrichtung gegen die Tankwand 1 gedrückt. Durch die rhomboide Querschnittsform sind die einzelnen Schichten der Packung unter einem spitzen Winkel gegen die Tankwand gerichtet. Die wasserdurchlässigen Schichten 3 bestehen aus Kunststoff-Nadelfilz, die wasserundurchlässigen Schichten 4 sind durch Auftrag einer gummielastischen Kunststoffmasse hergestellt. Der die Tankwand 1 herunterlaufende Wasserfilm 6 wird bei Auftreffen auf die Abstreiferpackung 2 zerteilt. Ein Teil des Wassers wird bereits durch die obere Deckschicht der Packung von der Tankwand abgelenkt. Der Rest des Wasserfilms gelangt in den Spalt zwischen Tankwand und Abstreiferpackung. Durch Unterbrechung des Wasserfilmes und Angebot einer großen, benetzbaren Oberfläche saugen die wasserdurchlässigen Schichten 3 den restlichen Wasserfilm stufenweise von der Tankwand. Die wasserundurchlässigen Schichten 4 verhindern hierbei die gegenseitige Befeuchtung der wasseraufnehmenden Schichten, sodaß die jeweils darunterliegende Schicht ihre volle Saugwirkung behält und andererseits das in den einzelnen Schichten aufgenommene Wasser zwangsweise zur Rückseite der Abstreiferpackung abgeleitet wird. Die untere Deckschicht 5 der Abstreiferpackung ist besonders dick ausgebildet und wirkt gleichzeitig als Dichtelement zur Begrenzung der Produktemission.In Fig. 1, the operation of the wiper pack described according to the invention is shown. The scraper pack, generally designated by the reference number 2, is pressed against the tank wall 1 by a pressing device (not shown). Due to the rhomboid cross-sectional shape, the individual layers of the pack are directed at an acute angle against the tank wall. The water-permeable layers 3 consist of plastic needle felt, the water-impermeable layers 4 are produced by applying a rubber-elastic plastic mass. The water film 6 running down the tank wall 1 is cut up when it hits the wiper pack 2. Part of the water is already diverted from the tank wall by the top cover layer of the pack. The rest of the water film gets into the gap between the tank wall and the wiper pack. By interrupting the water film and offering a large, wettable surface, the water-permeable layers 3 gradually suck the remaining water film from the tank wall. The water-impermeable layers 4 prevent mutual moistening of the water-absorbing layers, so that the layer underneath in each case retains its full suction effect and, on the other hand, the water absorbed in the individual layers is forcibly diverted to the rear of the wiper pack. The lower cover layer 5 of the wiper pack is particularly thick and at the same time acts as a sealing element to limit product emissions.

Fig. 2 zeigt eine perspektivische Schnittansicht einer Sekundärdichtung an einem Schwimmdachtank mit der erfindungsgemäß beschriebenen Abstreiferpackung als äußeres Kontaktelement zur Tankwand, welche gleichzeitig die Funktion einer Profildichtung erfüllt. Vergleichbare Bauteile sind mit den für Fig. 1 verwendeten Bezugszahlen bezeichnet, die jedoch mit einem Indexstrich versehen sind.Fig. 2 shows a perspective sectional view of a secondary seal on a floating roof tank with the wiper packing described according to the invention as an external contact element to the tank wall, which at the same time fulfills the function of a profile seal. Comparable components are with those used for Fig. 1 Reference numbers designated, but which are provided with an index line.

Die Abstreiferpackung 2' sitzt kraftschlüssig in kurzen, C-förmigen Aufnahmeprofilstücken 7, die durch schmale Federbänder 9 gegen die Tankwand gedrückt werden. Mit der unteren Deckschicht 5 der Abstreiferpackung 2' ist die Sekundär-Dichtungsschürze 10 durchgehend fest verbunden, welche den gesamten Ringspalt 11 überspannt und gemeinsam mit den Federbändern 9 am äußeren, oberen Rande des Schwimmdaches 12 befestigt. Die C-förmigen Aufnahmeprofilstücke 7 sind an ihren senkrechten Stegen perforiert 8, sodaß das von der Tankwand aufgenommene Wasser hier austreten kann und oberhalb der Sekundär-Dichtungsschürze 10 zum Schwimmach hin abgeleitet wird.The wiper pack 2 'sits non-positively in short, C-shaped receiving profile pieces 7, which are pressed against the tank wall by narrow spring strips 9. With the lower cover layer 5 of the wiper pack 2 ', the secondary sealing apron 10 is permanently connected, which spans the entire annular gap 11 and is fastened together with the spring bands 9 to the outer, upper edge of the floating roof 12. The C-shaped receiving profile pieces 7 are perforated 8 on their vertical webs, so that the water absorbed by the tank wall can escape here and is discharged above the secondary sealing apron 10 to the swimming pool.

In Fig. 3 ist die erfindungsgemäß beschriebene Abstreiferpackung in Verbindung mit herkömmlichen Wetterblechen dargestellt. Die Abstreiferpackung 2" ist mit Hilfe Z-förmiger Aufnahmeprofilstücken 7" am oberen Ende der Wetterbleche 9" befestigt und ist in spitzem Winkel gegen die Tankwand 1" gerichtet. Das an der Perforation 8" der Z-förmigen Aufnahmeprofilstücke 7" austretende Wasser wird über die Wetterbleche 9" zum Schwimmdach 12" hin abgeführt.3 shows the wiper pack described according to the invention in connection with conventional weather plates. The wiper pack 2 "is attached to the upper end of the weather plates 9" by means of Z-shaped receiving profile pieces 7 "and is directed at an acute angle against the tank wall 1". The water emerging at the perforation 8 "of the Z-shaped receiving profile pieces 7" is discharged via the weather plates 9 "to the floating roof 12".

Claims (4)

1. Apparatus for removing the precipitated water from the vertical internal wall (1) of a tank having a floating roof, consisting of an annular wiper element (2), pressed resiliently against the tank wall above annular gap seals or weather plates, characterized in that the wiper element (2) consists of a layered packing of elastic materials, which is composed in the vertical direction alternately of water-absorbing and water-permeable layers (3) and of water-impermeable layers (4), the uppermost and lowest covering layers consisting of water-impermeable layers and the entire packing forming a rhomboid in cross-section, so that when pressed against the tank wall (1) the individual layers (3, 4) are oriented at an acute angle to the tank wall and each individual layer obtains full contact at its edge face with the tank wall, and that furthermore the wiper packing composed of individual pieces placed side-by-side to form a closed ring is held in short seating profile pieces (7) and is pressed against the tank wall by a plurality of individually acting spring elements (9), the vertical arms of the seating profile pieces being perforated (8), so that the absorbed water can flow out there.
2. Apparatus according to claim 1, characterized in that the waterpermeable layers (3) are of corrosion-resistent, weather-resistent and decay-resistent plastics materials having a felt-type, fleece-type or fibrous or otherwise absorbent and water-permeable structure.
3. Apparatus according to claims 1 and 2, characterized in that the water-impermeable layers (4) have been produced by application of rubberizing or an elastic plastics material between the water-permeable layers (3).
4. Apparatus according to one of claims 1 to 3, characterized in that the lowest covering layer (5) of the wiper packing (2) consists of an especially thick rubberizing or elastic plastics coating, so that the wiper element is impermeable to vapour from below.
EP83100026A 1982-01-25 1983-01-04 Drain arrangement for precipitations from a vertical inside wall of a floating roof tank Expired EP0084770B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83100026T ATE13652T1 (en) 1982-01-25 1983-01-04 DEVICE FOR REMOVING PRECIPITATION FROM THE INTERNAL VERTICAL WALL OF A FLOATING ROOF TANK.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823202278 DE3202278A1 (en) 1982-01-25 1982-01-25 DEVICE FOR REMOVING THE PRECIPITATED WATER FROM THE VERTICAL INNER WALL OF A FLOATING ROOF TANK
DE3202278 1982-01-25

Publications (2)

Publication Number Publication Date
EP0084770A1 EP0084770A1 (en) 1983-08-03
EP0084770B1 true EP0084770B1 (en) 1985-06-05

Family

ID=6153861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100026A Expired EP0084770B1 (en) 1982-01-25 1983-01-04 Drain arrangement for precipitations from a vertical inside wall of a floating roof tank

Country Status (4)

Country Link
US (1) US4456144A (en)
EP (1) EP0084770B1 (en)
AT (1) ATE13652T1 (en)
DE (2) DE3202278A1 (en)

Cited By (1)

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DE102004001206A1 (en) * 2004-01-06 2005-08-04 Heinrich Imhof Device for sealing the annular gap between a container inner wall of a vertical round container intended for a liquid and a floating cover

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US4615458A (en) * 1985-08-05 1986-10-07 Chicago Bridge & Iron Company Floating roof tank with rim space seal
US6379738B1 (en) * 1999-11-16 2002-04-30 Nestec S.A. Meat emulsion product
GB2386637B (en) * 2002-02-07 2005-06-08 Polytank Ltd Covers for tanks
US8454101B2 (en) * 2009-06-11 2013-06-04 Getac Technology Corporation Waterproof assembly for electronic device and watertight door thereof
US11548725B2 (en) 2013-03-15 2023-01-10 Industrial & Environmental Concepts, Inc. Cover systems, tank covering methods, and pipe retention systems

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DE1921667C3 (en) * 1969-04-28 1979-10-04 Shell Internationale Research Maatschappij B.V., Den Haag (Niederlande) Edge sealing for floating roofs of containers for storing liquids
GB1417959A (en) * 1971-12-18 1975-12-17 Greengate Ind Polymers Ltd Floating roof for a liquid storage tank
AT319145B (en) * 1972-12-06 1974-12-10 Voest Ag Device for sealing the between the container wall and the floating roof of a large-capacity container for mineral oils or the like. existing annular gap
DE2320066C3 (en) * 1973-04-19 1979-04-05 Vsesojuznyj Nautschno-Issledovatelskij Institut Po Montaschnym I Specialnym Stroitelnym Rabotam, Moskau Seal to close a floating lid
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US4406377A (en) * 1980-09-02 1983-09-27 Bruening Robert A Low friction seal for a floating roof
US4397399A (en) * 1981-09-08 1983-08-09 Tank Services, Incorporated Seal for floating roofs of storage tanks

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004001206A1 (en) * 2004-01-06 2005-08-04 Heinrich Imhof Device for sealing the annular gap between a container inner wall of a vertical round container intended for a liquid and a floating cover
DE102004001206A8 (en) * 2004-01-06 2005-11-17 Heinrich Imhof Device for sealing the annular gap between a container inner wall of a vertical round container intended for a liquid and a floating cover
DE102004001206B4 (en) * 2004-01-06 2006-05-04 Heinrich Imhof Device for sealing the annular gap between a container inner wall of a vertical round container intended for a liquid and a floating cover

Also Published As

Publication number Publication date
ATE13652T1 (en) 1985-06-15
US4456144A (en) 1984-06-26
DE3202278A1 (en) 1983-07-28
EP0084770A1 (en) 1983-08-03
DE3360232D1 (en) 1985-07-11

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