EP0903304B1 - Protection de gros réservoirs non-enterrés contre la corrosion - Google Patents

Protection de gros réservoirs non-enterrés contre la corrosion Download PDF

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Publication number
EP0903304B1
EP0903304B1 EP19980117736 EP98117736A EP0903304B1 EP 0903304 B1 EP0903304 B1 EP 0903304B1 EP 19980117736 EP19980117736 EP 19980117736 EP 98117736 A EP98117736 A EP 98117736A EP 0903304 B1 EP0903304 B1 EP 0903304B1
Authority
EP
European Patent Office
Prior art keywords
skirt
tank
waterproof
storage tanks
vertical 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 - Lifetime
Application number
EP19980117736
Other languages
German (de)
English (en)
Other versions
EP0903304A1 (fr
Inventor
H.J. C/O Mafina Moor
J. C/O Tankcare B.V. De Jonge
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.)
MOOR, H. J.
TANKCARE BV
Original Assignee
Tankcare BV
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
Priority claimed from EP97116242A external-priority patent/EP0905055A1/fr
Application filed by Tankcare BV filed Critical Tankcare BV
Priority to EP19980117736 priority Critical patent/EP0903304B1/fr
Publication of EP0903304A1 publication Critical patent/EP0903304A1/fr
Application granted granted Critical
Publication of EP0903304B1 publication Critical patent/EP0903304B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • B65D90/04—Linings
    • 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
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/22—Safety features

Definitions

  • This invention relates to a method for protecting above-ground storage tanks against external corrosion.
  • Large storage tanks can have a diameter of up to about 88 m and the weight of their content can reach up to 100,000 tons.
  • they comprise as bottom part an horizontal annular metal ring (1) which has a mean diameter of about 88 m, a width of 30 to 50 cm and a thickness of 10 to 13 mm.
  • This horizontal structure (1,2) is surmounted by the vertical metal walls (3) of the tank which are made of a series of cylindrical shells welded on top of one another, each having a height of 1.5 to 2.5 m and a thickness which decreases from about 32 mm for the lowermost shell to about 6 mm for the uppermost shell; the total height of the tank is about 21 metres.
  • the lowermost cylindrical vertical wall is welded to the horizontal ring (1) by a welding seam (26).
  • These tanks are equipped with an internal floating roof (4) which is made of a metal sheet, about 5 mm thick, weighs about 350 tons and is equipped with up to 200 legs (5) which, under operating conditions, are set at a height under the roof of 1.5 m and, under maintenance conditions, at a height under the roof of 2 m.
  • This roof (4) serves several purposes: it is used to prevent vapours and gases from escaping the tank, to protect the stored fluid from external contamination and to determine the fluid level in the tank. It is equipped with safety devices to allow prompt intervention in case of fire hazard.
  • It also contains a system (6) for collecting and evacuating rain water which would otherwise accumulate on top of the roof (4) and cause it to sink; the water is evacuated through a pipe which is made of three or more segments (7) articulated with respect to one another (8) in order to adjust to the changing height of the roof.
  • the tanks are filled and emptied through a pipe (9) which has a diameter of about 90 cm and allows a flow rate of about 16000 m 3 per hour.
  • the input flow can automatically be interrupted when the roof has nearly risen to the top of the tank.
  • Such basement (10) typically has a diameter which is about 3 metres larger than the diameter of the storage tank and a height of about 1 metre above the ground. It is covered with a waterproof layer of bitumen which has a thickness of about 10 cm.
  • the platform undergoes deformations when the level of the fluid in the tank is modified. It flattens when the tank is filled and rebounds when the tank is emptied; this deformation can reach up to 3 cm.
  • the tank itself undergoes an horizontal deformation of up to about 8 cm for a full tank of 88 m diameter.
  • the welding seams and metal sheets forming the floor of the large storage tanks must be inspected at regular intervals (e.g. every 10 years).
  • the tank's floor can only be accessed through the tank interior; this therefore requires that the tank be completely emptied and gas-free for inspection.
  • the present invention discloses a method for protecting against external corrosion the lower part of storage tanks which have a diameter larger than 20 metres and preferably larger than 40 m.
  • the waterproof skirt (14) fitted around the exterior bottom part of the tank is a flexible membrane made of polypropylene sheets.
  • the upper end of the skirt (14) is glued to the vertical wall of the tank at a height of about 60 cm (15) and the inferior end of the skirt is glued to the bitumen of the tank basement (10) at an horizontal distance of about 60 cm from the bottom of the tank (20).
  • the skirt (14) is allowed a small amount of curvature between these two fixed points (15,20) in order to accomodate for the lateral motions of the tank's wall and the vertical motion of the tank basement when the tank is filled or emptied.
  • Ventilation is obtained through "windows" or openings (21).
  • these openings are properly screened by a fine flexible mesh (22) in order to avoid the undesired entrance of vermin (rodents or insects) or waste, and covered by an awning in order to avoid water infiltration (23).
  • Such windows are typically spaced between 10 and 15 m.
  • a prior art embodiment was designed to solve the problem of corrosion by digging a drainage trough (24) around the edge of the metal ring (1) supporting the bottom of the tank (2), in order to collect rain water. It was observed however that the upward and downward motion of the tank at unloadindg or loading did create a small additional bulge (25), thereby reducing but not suppressing the problem of corrosion.
  • a waterproof skirt (not represented) must therefore also be fitted around the bottom of the storage tank, but in addition to the above-described embodiment of the present invention, it is necessary to dig narrow evacuation troughs (not represented), about perpendicular to the drainage trough, at regular intervals (e.g. every 25m) in order to drain any water collected in the drainage trough.
  • These evacuation troughs are each screened by a stainless steel mesh which is tightly fitted to the bottom of the trough at the lower end and glued to the bottom of the waterproof skirt at the upper end.
  • the awning (23) is mobile and can be opened and fastened with refastenable closing means; it is opened when inspection is desired (see Figure 7) and, under operating conditions, it remains in a semi-open position thereby allowing moisture out and no water in.
  • the skirt (14) is fitted to the vertical wall of the metal tank by a watertight seal (15) at a height ranging from 30 to 100 cm from the ground, downwardly extends, without touching the ground, to a lateral distance which goes beyond the edge (17) of the platform (10), defined here as the point where the platform floor starts sloping down, and makes an angle (16) with the vertical wall of the tank defined as tan -1 (L/H) where L is the horizontal distance between the vertical wall of the tank and the edge of the platform increased by at most 15 cm, and H is the height above the tank's floor at which the skirt is attached to the vertical wall of the tank.
  • the above-described set up creates a dry and ventilated space (18) limited by the vertical wall (3) of the tank, the horizontal floor (27) of the platform and the skirt (14); this space is screened (19) to avoid entrance of vermin or waste.
  • the skirt is manufactured either by using a rigid material or by using a semi-flexible material maintained in an open position by means of rigid elements placed at regular intervals.
  • the waterproof skirt fitted around the exterior bottom part of the tank was a flexible membrane made of polypropylene sheets.
  • the upper end of the skirt has been glued to the vertical wall of the tank at a height of about 60 cm and the inferior end of the skirt has been glued to the horizontal floor of the platform at an horizontal distance of about 60 cm from the bottom of the tank.
  • the propylene sheets which have a surface of 1m by 3m, and a thickness of 2mm were sealed together. They were made of thermoplastic rubber extruded from a compound based on polypropylene; they offered an improved resistance to biodegradation, chemical reactions and UV light. Their properties were quantified as follows.
  • Ventilation was obtained by cutting rectangular openings about 30 cm high and 20 cm wide in the skirt; these openings were screened by a fine flexible mesh and covered by an awning which was attached to the upper edge of the opening and refastened to a half-closed position with Velcro®, under operating conditions. The openings were placed every 10 m.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Building Environments (AREA)
  • Foundations (AREA)

Claims (10)

  1. Procédé pour conférer une protection contre la corrosion externe à la partie inférieure de réservoirs de stockage (1, 2) dont le diamètre est supérieur à 20 m, en plaçant une jupe imperméable à l'eau (14) autour de la partie inférieure du réservoir, caractérisé en ce que la jupe imperméable à l'eau est une jupe s'étendant vers le bas conçue pour créer un espace ventilé (18) limité par la paroi verticale du réservoir (3), par la base horizontale du soubassement (10) et par la jupe.
  2. Procédé selon la revendication 1, pour conférer une protection contre la corrosion externe à la partie inférieure de réservoir de stockage dont le diamètre est supérieur à 40 m.
  3. Procédé selon la revendication 1 ou 2, dans lequel la jupe est réalisée en une membrane inflexible imperméable à l'eau qui vient s'appliquer contre la paroi verticale du réservoir et contre la base horizontale de la plate-forme via des joints étanches imperméables à l'eau (15 et 20) et qui présente des ouvertures de ventilation munies de treillis (21) qui sont protégées contre l'infiltration de l'eau par des bâches (23) semi-ouvertes (22) et qui sont espacées par intervalles réguliers.
  4. Procédé selon la revendication 3, qui permet simultanément l'inspection du joint (26) qui joint les parois métalliques verticales du réservoir de stockage à sa base métallique horizontale à travers les ouvertures de ventilation.
  5. Procédé selon la revendication 3 ou 4, dans lequel la jupe imperméable à l'eau est constituée par des feuilles de propylène jointes l'une à l'autre de manière étanche.
  6. Procédé selon la revendication 1 ou 2, dans lequel la jupe est appliquée contre la paroi verticale du réservoir métallique via un joint étanche imperméable à l'eau (15) à une hauteur qui se situe dans le domaine de 30 à 100 cm par rapport au sol, s'étend vers le bas jusqu'à une distance latérale qui dépasse le bord de la plate-forme sans toucher le sol en créant un espace sec et ventilé (18) limité par la paroi verticale du réservoir, la base horizontale de la plate-forme et la jupe et qui est munie d'un treillis (19) pour éviter la pénétration de la vermine ou de déchets.
  7. Procédé selon la revendication 6, dans lequel la jupe est constituée d'une matière rigide.
  8. Procédé selon la revendication 6, dans lequel la jupe est constituée d'une matière semi-flexible maintenue dans une position ouverte à l'aide d'éléments rigides placés à des intervalles réguliers.
  9. Procédé selon l'une quelconque des revendications 3 à 5, dans lequel l'eau récoltée dans la rigole de drainage facultative entourant la partie inférieure du réservoir de stockage de grande dimension est évacuée à l'extérieur de la zone protégée par la jupe imperméable à l'eau via une rigole de drainage disposée approximativement en position perpendiculaire à ladite rigole de drainage principale.
  10. Utilisation du procédé selon l'une quelconque des revendications 1 à 9 pour augmenter l'intervalle de temps séparant deux inspections successives des joints étanches et de la base de réservoirs de stockage de grandes dimensions.
EP19980117736 1997-09-18 1998-09-16 Protection de gros réservoirs non-enterrés contre la corrosion Expired - Lifetime EP0903304B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19980117736 EP0903304B1 (fr) 1997-09-18 1998-09-16 Protection de gros réservoirs non-enterrés contre la corrosion

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP97116242A EP0905055A1 (fr) 1997-09-18 1997-09-18 Protection de gros réservoirs non-enterrés contre la corrosion
EP97116242 1997-09-18
EP19980117736 EP0903304B1 (fr) 1997-09-18 1998-09-16 Protection de gros réservoirs non-enterrés contre la corrosion

Publications (2)

Publication Number Publication Date
EP0903304A1 EP0903304A1 (fr) 1999-03-24
EP0903304B1 true EP0903304B1 (fr) 2002-07-24

Family

ID=26145787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980117736 Expired - Lifetime EP0903304B1 (fr) 1997-09-18 1998-09-16 Protection de gros réservoirs non-enterrés contre la corrosion

Country Status (1)

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EP (1) EP0903304B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3002927B1 (fr) * 2013-03-06 2015-04-03 Philippe Collay Deflecteur de protection de pieds de structure

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955018A (en) * 1957-01-24 1960-10-04 Pure Oil Co Corrosion inhibition
JPS5899380A (ja) * 1981-12-07 1983-06-13 株式会社フジクラ タンク裾廻り部の防水防食工法
DE9216803U1 (fr) * 1992-12-10 1993-03-18 Plus Werbung Martin Bruckner Gmbh, 7105 Leingarten, De
FR2699258B1 (fr) * 1992-12-11 1995-03-03 Schneider Ind Revêtement de protection pour citernes à gaz destinées à être enterrées.

Also Published As

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EP0903304A1 (fr) 1999-03-24

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