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EP0084770A1 - 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
EP0084770A1
EP0084770A1 EP83100026A EP83100026A EP0084770A1 EP 0084770 A1 EP0084770 A1 EP 0084770A1 EP 83100026 A EP83100026 A EP 83100026A EP 83100026 A EP83100026 A EP 83100026A EP 0084770 A1 EP0084770 A1 EP 0084770A1
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EP
European Patent Office
Prior art keywords
water
layers
tank wall
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.)
Granted
Application number
EP83100026A
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German (de)
French (fr)
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EP0084770B1 (en
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
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Application filed by INGENIEURBURO IMHOF GmbH, Ingenieurbuero Imhof GmbH filed Critical INGENIEURBURO IMHOF GmbH
Priority to AT83100026T priority Critical patent/ATE13652T1/en
Publication of EP0084770A1 publication Critical patent/EP0084770A1/en
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Publication of EP0084770B1 publication Critical patent/EP0084770B1/en
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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

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 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-wiping element should be sufficiently elastic and vapor-tight from the product side, so that in addition to the safe removal of the water film, it can also perform the function of a sealing body to limit steam emissions.
  • an annular wiping element pressed against the tank wall above conventional annular gap seals or weather plates consists of a layered pack of elastic materials which is alternately constructed in the vertical direction from water-absorbing and permeable layers and from water-impermeable layers, wherein the upper and lower cover layers consist of water-impermeable layers and the entire package forms a rhomboid in cross-section, so that when pressed against the tank wall, the individual layers are directed at an acute angle against the tank wall and each individual layer gets full contact with the end face of the tank wall, and that the stripper pack, which is assembled from individual pieces to form a closed ring, is held in short receiving profile pieces and by a large number of individually acting spring elements against the tank wall is pressed, the vertical webs of the receiving profile pieces are perforated so that the water absorbed can drain off 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 the total thickness of the stripper pack are to be dimensioned such that even in the case of extreme rainfall, the lowest, water-permeable layer only has to remove small amounts of water.
  • 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 remainder of the water film enters into the gap between tank wall and A bstreiferpackung.
  • 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 designated by the reference numerals used for FIG. 1, which, however, 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 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, is permanently connected to the lower cover layer 5 of the wiper pack 2 ′.
  • 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 drained off above the secondary sealing apron 10 to the floating roof.
  • FIG. 3 shows the wiper pack described according to the invention in connection with conventional weather plates.
  • 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".

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Cleaning In General (AREA)
  • Working Measures On Existing Buildindgs (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. For a number of storage products that are important today, rainwater penetration is harmful to the product. 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 Wetterschutzeinrichtungen 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 23 20 066, DE 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 23 20 066, DE 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. That under blow Rain falling rain against the inside wall of the tank 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 when the roof is moving upwards or damage the coating on the inside wall of the tank.

Desweiteren sind Konstruktionen bekannt, die von vorgenannten Wetterblechen (US 4.116.358), oder schmalen Federschenkeln (DE 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 Profildichtüng eine echte Sekundärdichtung mit guter Emissionsminderung und Ableitung der in den Ringspalt einfallenden Niederschläge darstellen. Der bei Schlaqregen 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 23 58 636) as supports and with the aid of a sealing apron which closes the entire annular gap width continuously above or below the spring plates or spring legs and one at the ends the weather plates or spring legs attached, endless profile seal represent a real secondary seal with good emission reduction and derivation of the precipitation falling into the annular gap. However, the water film on the tank wall that forms during heavy rain cannot be removed effectively either.

Weiterhin sind Konstruktionen bekannt, bei denen eine dickwandige Gummischürze mit eingearbeiteten Blattfedern als endlose Manchette den Ringspalt unter elastischer Durchbiegung überspannt (DE 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 28 32 978): It was found to be disadvantageous that this cuff can turn inside out when the floating roof moves upwards and in this state has no stripping 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 caused by fine unevenness and the Rust on the tank wall and the cohesion and capillary action of the water film is limited.

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 Idealfall 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. Ideally, the water-wiping element should be sufficiently elastic and vapor-tight from the product side, so that in addition to the safe removal of the water film, it can also perform the function of a sealing body to limit steam emissions.

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 Querschnitt 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 according to the invention in that an annular wiping element pressed against the tank wall above conventional annular gap seals or weather plates consists of a layered pack of elastic materials which is alternately constructed in the vertical direction from water-absorbing and permeable layers and from water-impermeable layers, wherein the upper and lower cover layers consist of water-impermeable layers and the entire package forms a rhomboid in cross-section, so that when pressed against the tank wall, the individual layers are directed at an acute angle against the tank wall and each individual layer gets full contact with the end face of the tank wall, and that the stripper pack, which is assembled from individual pieces to form a closed ring, is held in short receiving profile pieces and by a large number of individually acting spring elements against the tank wall is pressed, the vertical webs of the receiving profile pieces are perforated so that the water absorbed can drain off 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 Abstreiferpakkung 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 the total thickness of the stripper pack are to be dimensioned such that even in the case of extreme rainfall, the lowest, water-permeable layer only has to remove 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 remainder of the water film enters into the gap between tank wall and A bstreiferpackung. 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 designated by the reference numerals used for FIG. 1, which, however, 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 Schwimmdach 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. The secondary sealing apron 10, 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, is permanently connected to the lower cover layer 5 of the wiper pack 2 ′. 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 drained off above the secondary sealing apron 10 to the floating roof.

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 l" 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 Abstreiferpackung 2 "using Z -shaped A ufnahmeprofilstücken 7""and is fixed in an acute angle against the tank wall l" at the upper end of the weathering panels 9 directed. 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. Vorrichtung zur Entfernung des Niederschlagswassers von der senkrechten Innenwand eines Schwimmdachtanks, bestehend aus einem oberhalb von Ringspaltabdichtungen oder Wetterblechen federnd gegen die Tankwand gedrückten, ringförmigen Abstreifelement, dadurch gekennzeichnet, daß das Abstreifelement (2) aus einer geschichteten Pakkung elastischer Materialien besteht, welche in vertikaler Richtung abwechselnd aus wasseraufnehmenden und -durchlässigen Schichten (3) und aus wasserundurchlässigen Schichten (4) aufgebaut ist, wobei die obere und die untere Deckschicht aus wasserundurchlässigen Schichten bestehen und die gesamte Packung im Querschnitt einen Rhomboid bildet, sodaß bei Andrücken an die Tankwand (1) die einzelnen Schichten (3, 4) 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 (7) gehalten und durch eine Vielzahl einzeln wirkender Federelemente (9) gegen die Tankwand gedrückt wird, wobei die senkrechten Stege der Aufnahmeprofilstücke perforiert (8) sind, sodaß das aufgenommene Wasser hier abfließen kann.1. Device for removing the rainwater from the vertical inner wall of a floating roof tank, consisting of a ring-shaped stripping element resiliently pressed against the tank wall above annular gap seals or weather plates, characterized in that the stripping element (2) consists of a layered package of elastic materials, which in the vertical direction is alternately made up of water-absorbing and permeable layers (3) and water-impermeable layers (4), the upper and lower cover layers consisting of water-impermeable layers and the entire pack forming a rhomboid in cross section, so that when pressed against the tank wall ( 1) the individual layers (3, 4) are directed at an acute angle against the tank wall and each individual layer with its end face gets full contact with the tank wall, and that the stripper pack, which is made up of individual pieces to form a closed ring, continues in short Au Support profile pieces (7) held and pressed by a plurality of individually acting spring elements (9) against the tank wall, wherein the vertical webs of the receiving profile pieces are perforated (8), so that the absorbed water can drain off here. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die wasserdurchlässigen Schichten (3) aus korrosions-, witterungs- und fäulnisbeständigen Kunststoffen mit filz-, vlies- oder faserartiger oder sonstwie saugfähiger und wasserdurchlässiger Struktur bestehen.2. Device according to claim 1, characterized in that the water-permeable layers (3) consist of corrosion, weather and rot-resistant plastics with felt, fleece or fibrous or otherwise absorbent and water-permeable structure. 3. Vorrichtung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die wasserundurchlässigen Schichten (4) durch Aufbringen einer Gummierung oder einer elastischen Kunststoffmasse zwischen den wasserdurchlässigen Schichten (3) hergestellt worden sind.3. Device according to claims 1 and 2, characterized in that the water-impermeable layers (4) have been produced by applying a rubber coating or an elastic plastic mass between the water-permeable layers (3). 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die untere Deckschicht (5) der Abstreiferpackung (2) aus einer besonders dicken Gummierung oder elastischen Kunststoffbeschichtung besteht, sodaß das Abstreifelement von unten her dampfdicht ist.4. Device according to one of claims 1 to 3, characterized in that the lower cover layer (5) of the wiper pack (2) consists of a particularly thick rubber coating or elastic plastic coating, so that the wiping element is vapor-tight 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
DE3202278 1982-01-25
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

Publications (2)

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

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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)

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NL8601990A (en) * 1985-08-05 1987-03-02 Chicago Bridge & Iron Co STORAGE RESERVOIR.
EP1553028A3 (en) * 2004-01-06 2005-11-02 Heinrich Imhof Sealing device for the annular space between a container internal wall of a vertical cylindrical container for fluid and the floating roof
KR100794540B1 (en) * 1999-11-16 2008-01-17 소시에떼 데 프로듀이 네슬레 소시에떼아노님 Meat emulsion products

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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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GB1417959A (en) * 1971-12-18 1975-12-17 Greengate Ind Polymers Ltd Floating roof for a liquid storage tank
US4099643A (en) * 1977-05-20 1978-07-11 Mobil Oil Corporation Seal for floating roof tank

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8601990A (en) * 1985-08-05 1987-03-02 Chicago Bridge & Iron Co STORAGE RESERVOIR.
KR100794540B1 (en) * 1999-11-16 2008-01-17 소시에떼 데 프로듀이 네슬레 소시에떼아노님 Meat emulsion products
EP1553028A3 (en) * 2004-01-06 2005-11-02 Heinrich Imhof Sealing device for the annular space between a container internal wall of a vertical cylindrical container for fluid and the floating roof

Also Published As

Publication number Publication date
EP0084770B1 (en) 1985-06-05
US4456144A (en) 1984-06-26
DE3360232D1 (en) 1985-07-11
DE3202278A1 (en) 1983-07-28
ATE13652T1 (en) 1985-06-15

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