EP0227801A1 - Reservoir de stockage a double paroi formant un compartiment de contenance secondaire - Google Patents

Reservoir de stockage a double paroi formant un compartiment de contenance secondaire

Info

Publication number
EP0227801A1
EP0227801A1 EP86904529A EP86904529A EP0227801A1 EP 0227801 A1 EP0227801 A1 EP 0227801A1 EP 86904529 A EP86904529 A EP 86904529A EP 86904529 A EP86904529 A EP 86904529A EP 0227801 A1 EP0227801 A1 EP 0227801A1
Authority
EP
European Patent Office
Prior art keywords
storage tank
tank
jacket
storage
gas pervious
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.)
Withdrawn
Application number
EP86904529A
Other languages
German (de)
English (en)
Inventor
Bruce R. Sharp
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.)
Individual
Original Assignee
Individual
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 US06/824,680 external-priority patent/US4653312A/en
Application filed by Individual filed Critical Individual
Publication of EP0227801A1 publication Critical patent/EP0227801A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B65D90/48—Arrangements of indicating or measuring devices
    • B65D90/50—Arrangements of indicating or measuring devices of leakage-indicating devices
    • B65D90/501—Arrangements of indicating or measuring devices of leakage-indicating devices comprising hollow spaces within walls
    • B65D90/503—Arrangements of indicating or measuring devices of leakage-indicating devices comprising hollow spaces within walls under pressure or vacuum
    • 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
    • B65D90/48—Arrangements of indicating or measuring devices
    • B65D90/50—Arrangements of indicating or measuring devices of leakage-indicating devices
    • B65D90/501—Arrangements of indicating or measuring devices of leakage-indicating devices comprising hollow spaces within walls
    • 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
    • B65D90/48—Arrangements of indicating or measuring devices
    • B65D90/50—Arrangements of indicating or measuring devices of leakage-indicating devices
    • B65D90/505—Arrangements of indicating or measuring devices of leakage-indicating devices comprising porous spaces or porous layers in walls
    • 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
    • B65D90/48—Arrangements of indicating or measuring devices
    • B65D90/50—Arrangements of indicating or measuring devices of leakage-indicating devices
    • B65D90/505—Arrangements of indicating or measuring devices of leakage-indicating devices comprising porous spaces or porous layers in walls
    • B65D90/507—Arrangements of indicating or measuring devices of leakage-indicating devices comprising porous spaces or porous layers in walls under pressure or vacuum

Definitions

  • This invention relates to storage tanks. More particularly, the invention relates to underground storage tanks which have secondary containment means. --
  • Single and double walled tanks made from fiberglass reinforced resinous material are built using a number of
  • Fiberglass and resin are then applied over the cardboard molds and onto adjacent areas of the cylinder so as to become an integral part of the inner tank shell.
  • the mold is finally removed.
  • ⁇ ribs and one end of the tank are produced in this stage of the method.
  • the above steps are repeated to obtain a second half-tank.
  • the two half-tanks are then joined together by appropriate sealing means.
  • the resultant single walled tank is capable of being installed in the ground and, in fact, is of the type which has been extensively used for the past twenty years.
  • the resultant product is a double walled storage tank system comprised of essentially two rigid tanks, one inside the other .
  • the mold has a design wherein the ribs are formed as the fiberglass and resin material is applied. After forming the inner tank of which the ribs are an integral part thereof,
  • the mold is removed.
  • the interior portion of the tank next has a fiberglass/resin layer applied over the rib indentations to result in a smooth cylindrical-shaped interior.
  • a second half-tank is formed in the same manner and the two halves joined.
  • a cylindrical-shaped outer tank is then formed in horizontal halves.
  • the formed inner tank and outer tank halves are assembled as in the first method described above to form a double walled storage tank system based on two rigid tanks with support ribs therebetween.
  • - used storage tanks can be provided with secondary containment means in a convenient, yet economical manner. Further, used storage tanks are refurbished to a standard equivalent to that possessed by a new tank and then upgraded to have a secondary containment feature.
  • a method of adding secondary containment capability to storage tanks comprises the steps of (a) applying a gas pervious material to a storage tank, (b) applying a layer of a fibrous reinforcing material onto the storage tank, and (c) applying a resinous material onto the reinforcing material. When the resinous material is cured, a containment means is formed which covers at least about the
  • FIG. 1 is a side view in partial section of a storage tank having a fibrous reinforced resinous material as a jacket completely surrounding the tank.
  • FIG. 2 is a end view of the storage tank of FIG. 1 - taken along lines 2-2.
  • FIG. 3 is a side view of a typical fiberglass reinforced resinous storage tank having support ribs surrounding the tank and a jacket of a fibrous reinforced resinous material surrounding the storage tank.
  • FIG. 4 is a side view of storage tank of this invention illustrating the use of monitor means.
  • FIG. 5 is a side view of storage tank of this invention illustrating another monitor means.
  • FIG. 6 is a partial view in section of a tank fitting
  • FIG. 7 is a partial view in section of another tank fitting used in a storage tank of this invention wherein a jacketed pipeline connected to the storage tank and jacketed storage tank can both be continuously monitored.
  • FIG. 8 is a partial view in section of a storage tank having a jacket over only a part of -its surface area.
  • FIG. 9 is a partial view in section of a manhead sleeve especially useful with the storage tank of FIG. 8.
  • FIG. 10 is another partial view in section of a manhead sleeve having attachment means for a bladder.
  • FIG.l there is shown an underground storage tank 10.
  • Storage tanks 10 of the type shown in FIG. 1 are well known and are widely used, ' especially in the
  • FIG.l A typical metal storage tank is shown in FIG.l. Sufficient openings are found in the storage tank 10 to allow for
  • lines 11, 12, and 13 are a fill pipe, dispensing line and vent pipe, respectively.
  • the fill pipe 11 provides as its obvious function the means by which gasoline can be pumped into the inner tank from an outside source, e.g. a tank truck. As illustrated in FIG. 1, fill pipe 11 comprises a line 14 through which gasoline flows to the inner tank 10 and a space 15 within
  • fill pipe connotes the pipe by which gasoline is pumped to the tank; it can be a single pipe, but more often has vapor recovery means associated
  • line 14 extends into the inner tank 10 with its end near the bottom.
  • Dispensing line 12 is used for withdrawing gasoline and delivering it to the consumer through gasoline dispenser 16.
  • a pump is positioned within the inner tank, dispensing line or gasoline dispenser for pumping gasoline to the dispenser.
  • the bottom of the dispensing line 12 is in close proximity with the bottom of the inner tank 10.
  • the vent pipe 13 is optional, though
  • a gas pervious material is applied to the storage tank before the jacket is formed.
  • the purpose of the separating agent is to insure that a subsequently applied fibrous reinforcing material and resinous material which form the jacket will not adhere to the inner storage tank. It is
  • closed space 18 is to provide a means by which the space therein can be monitored for possible tank or jacket leaks.
  • Gas pervious materials 19 used herein are foraminous ⁇ - or porous and can take on various physical shapes and
  • mattings examples are mattings, nets, screens, and meshes.
  • specific examples are jute, polyurethane foam, polyester foam, fiberglass matting; cotton matting, nylon matting, corrugated cardboard, and
  • a heat seal or sealing material e.g. a polymeric
  • Jacket 17 is a fibrous reinforced resinous material. It is formed by first applying a layer of fibrous reinforcing material on gas pervious material 19 found on storage tank 10. The fibrous reinforcing material can take
  • fibrous materials include fiberglass, nylon, and other synthetic fibrous materials.
  • the fibrous material if in a sheet form, can be laid onto the storage
  • a resinous material is next applied to the reinforcing material and thereafter cured.
  • resinous materials include polyesters, e.g. vinylesters, isophthalic polyesters, polyethylene, polypropylene, polyvinylchloride , polyure thane, and polyepoxide.
  • polyesters e.g. vinylesters, isophthalic polyesters, polyethylene, polypropylene, polyvinylchloride , polyure thane, and polyepoxide.
  • the listed resinous materials used in the construction of this jacket are not all inclusive, but only
  • the fibrous material can be applied in the form of chopped strands with the resinous materials described in the previous paragraph. That is, the chopped strand and resinous material can be sprayed from separate
  • the shape of the resultant jacket is such that it encases the rigid inner storage tank to form a closed space 18, but is not a structural part of it.
  • the jacket itself is capable of containing any liquid which is stored in the storage tank and which has leaked therefrom.
  • the jacket can have sufficient structural integrity to withstand external load forces normally encountered by underground storage tanks without suffering cracking or collapsing.
  • cracking is defined to mean ' s
  • the jacket structurally tears apart to the extent a liquid will at least seep there through. Slight surface deformations can be tolerated; however, deflections of greater than about two inches from the norm would be considered a collapse.
  • the jacket can be-
  • the jacket is semi-rigid or flexible.
  • the jacket is rigid and will not noticeably crack or collapse when external load forces are
  • a thinned walled tank and jacket are used.
  • the thin walls and consequent less total weight of the system can be used when a thin layer of gas pervious material is positioned between
  • the thickness of the gas pervious material is less than about 0.25 inches, (0.64 centimeters) preferably, less than about 0.125 inches (0.32 centimeters) .
  • the jacket is capable of holding over 100% by volume of the liquid stored in inner storage tank 10, more preferably from about 101% to about 150% by volume of the liquid stored
  • FIG. 3 illustrates a typical fiberglass reinforced resinous storage tank 20.
  • Such tanks are formed with supporting ridges 21 circumferentially surrounding the tank.
  • the ribs act as supports so that the weight of the tank,
  • An advantage of this invention is that the fibrous reinforcing material can be laid over the gas pervious material-covered ridges 21 and the resinous
  • the subsequently formed jacket 22 which conforms substantially to the contour of the rigid tank is not only capable of holding any leaked liquid but also is capable of withstanding external load forces without
  • gas pervious material 23 is an open cell polyurethane foam.
  • the space between the jacket 17 and the storage tank 10 can be monitored.
  • an access tube 24 extends from ground level through the jacket so as to be in communication with the closed space.
  • the " closed space can be filled with a detecting liquid.
  • This detecting liquid can be placed in the closed space by the manufacturer of the tank due to the fact the closed space between the storage tank and jacket occupies a small volume, e.g. about
  • a sight glass 25 At the end of the access tube is a sight glass 25. Whenever leakage occurs, a change in the level or color of a detecting liquid will occur and will be readily observed in the sight glass.
  • non-visual leak detection means such as pressure transducers or float controls can be used to detect a change in level.
  • the closed space can be placed either
  • Detection means associated with the closed space is capable of detecting any change in pressure resulting from the leak in the jacket or the storage tank. As shown in FIG. 5, there is provided a means 26 for
  • a pressure change sensor 27 is a part of the detection means.
  • a pressure gauge serves this purpose adequately.
  • an alarm system can be electronically linked with the pressure sensor to audibly or visually warn of a pre-set significant pressure change.
  • an access tube 29 with "strategically spaced holes extends from the air or vacuum pump 26 to the lower portion of the closed space.
  • 29 extends over the end portion of the storage tank, it -serves the dual function of strengthening the jacket at that point and providing a means to monitor for leaked liquid at a low point where it could ultimately seek.
  • Another embodiment of the detection means utilizes an analyzer capable of detecting the liquid being stored.
  • the detection means comprises the analyzer which is in communication with the closed space.
  • a vacuum means for withdrawing gaseous material from the closed space is used for the purpose of obtaining a sample.
  • element 27 could be an analyzer capable of detecting
  • Still another detection means utilizes a probe which extends through an access tube so as to monitor for leakage, preferably at or near the bottom of the closed space.
  • the probe is capable of detecting pre-selected liquids or gases.
  • polyester and epoxy type resins which may be reinforced with fiberglass or other known resin fibrous materials.
  • a vacuum or air pressure can be applied to the interior of the tank.
  • the failure to maintain the pressure is an indication that a leak is still present.
  • a vacuum of at least about 3 inches of mercury is applied.
  • a vacuum of from about 3 inches to about 10 inches of mercury is applied. This will show not only whether the storage tank still contains leaks, but whether it is structurally sound and capable of being completely refurbished. That is, once the leaks in a used tank have been repaired and the aforementioned vacuum applied, the structural soundness of the tank is " established. In the absence of such soundness-, the tank will collapse. Of course, when this happens, the tank must be scrapped without continuing further with the steps of this invention or special structural work undertaken.
  • FIGS. 6 and 7 show alternative fittings useful with the storage ' tanks whereby the closed space between the storage tank and jacket and the closed spaced associated with "a
  • a fitting 30 is provided for the point at which dispensing line 12 enters the storage tank 10.
  • the fitting which is a cylindrical shaped housing has a large enough inside diameter to fit around the dispensing line 12.
  • Jacket 17 is securely adhered to the fitting by adhesive means or clamping means so as to form a fluid tight closed space 18.
  • a threaded fitting 32 used to secure dispensing line 12 to the storage tank allows for easy field installation of the
  • Closed space 33 is formed by the dispensing line 12 and a flexible jacket 34, which is a part of a jacket pipeline system.
  • Separate monitor means of the type discussed above can be used to monitor for both storage tank and access pipeline leakage, i.e. fill, dispensing, and vent line leakage.
  • access tube 35 is used for monitoring closed space 18 for storage tank leakage.
  • fitting 36 shown in FIG. 7 allows one - monitor means be used to monitor for storage tank leakage and pipeline leakage.
  • fitting 36 is similar to fitting 30 discussed above except openings 37 are provided for communication with closed space 18.
  • -from fitting 36 is that it allows for the continuous monitoring of a total underground storage tank and delivery system by one monitor means. Any abnormal reading from the monitor means alerts an attendant to a problem. A further checking can pin point the location of the leak.
  • leak detection means discussed above can be electronically linked with an alarm system to audibly or visually warn of a pre-set significant change in the closed spaces.
  • the leak detection means and secondary containment means allow for an early warning of a deterioration of
  • the storage tank 10 is encased by jacket 17. However, it is possible to obtain partial
  • the bottom portion of the storage tank (where leaks are most likely to form) has the gas pervious material and jacket formed thereover.
  • at least about 40% and, more preferably, at least about 90% of the surface area of the storage tank has a jacket formed over it.
  • jacket 38 covers essentially the bottom half f storage tank 39.
  • Jacket 38 is sealed at- edges 40 to form a closed space 41 between said jacket and storage tank 39.
  • ⁇ 41 positioned in the closed space between jacket 38 and storage tank 39, performs the same function as the gas pervious material described with reference to FIGS. 1, 2, 4, and 5.
  • FIG.- 9 illustrates an inner manhead sleeve especially
  • the inner manhead sleeve 47 comprised of side walls which is in a cylindrical shape form dimensioned to fit within a manhead 46 of the type commonly found on
  • Inner manhead sleeve 47 is dimensioned to fit within the manhead 44, as aforementioned, and to form a closed space which is in communication through hole 54 with the closed space 45 between the inner tank 44 and jacket 43. Sealing material 55 between the inner manhead sleeve and the inner storage tank 44 is to seal the
  • FIG. 10 illustrates another inner manhead sleeve useful with storage tanks, the design of which is shown in FIG..8.
  • Inner manhead - sleeve 56 fits within manhead 46 so as to leave a closed space therebetween. Spot welds are used to accomplish this.
  • Inner cover 57, outer cover 58, gaskets 59, and bolts 61 and nuts 62 perform the same functions as in FIG. 9. Access
  • - opening 60 is to provide a means by which a dispensing line can enter.
  • bladder 66 is positioned within the inner storage tank to act as the primary containment means.
  • Lower flange 63 on inner manhead sleeve 56 is used as a means by which a ring clamp, together
  • a vacuum means could be used to monitor for leakage. Because bladder 66 of FIG. 10 may not be completely gasoline impervious, the vacuum means will withdraw gasoline and water due to natural condensation. The water can be removed by any known
  • shut-off valve can be provided to prevent the bladder from being overfilled.
  • the same concept can be used to recover gasoline which may leak from one tank and seep through the jacket of a second. tank.

Landscapes

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

Abstract

Procédé de fabrication d'un réservoir de stockage à double paroi (10) consistant à appliquer un agent de séparation perméable au gaz (19) à un réservoir de stockage (10), à appliquer une couche de matériau de renforcement fibreux sur l'agent de séparation (19) et à appliquer ensuite une double paroi résineuse (17). La double paroi qui en résulte (17), couvrant au moins 40% de la surface du réservoir de stockage (10) a une structure indépendante du dit réservoir. La double paroi (17) forme ainsi un compartiment secondaire de contenance réelle. Un système de réservoir de stockage à compartiment de contenance dont l'étanchéité n'est pas totale est obtenu par l'utilisation d'un dispositif de détection de fuite (27) destiné à régler l'espace fermé situé entre le réservoir de stockage (10) et la double paroi (17), afin de contrôler la fuite du réservoir ou de la double paroi.
EP86904529A 1985-06-17 1986-06-16 Reservoir de stockage a double paroi formant un compartiment de contenance secondaire Withdrawn EP0227801A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US74554085A 1985-06-17 1985-06-17
US745540 1985-06-17
US06/824,680 US4653312A (en) 1983-10-21 1986-01-31 Storage tanks having formed rigid jacket for secondary containment
US824680 1986-01-31
US85397486A 1986-04-21 1986-04-21
US853974 1986-04-21

Publications (1)

Publication Number Publication Date
EP0227801A1 true EP0227801A1 (fr) 1987-07-08

Family

ID=27419326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86904529A Withdrawn EP0227801A1 (fr) 1985-06-17 1986-06-16 Reservoir de stockage a double paroi formant un compartiment de contenance secondaire

Country Status (4)

Country Link
EP (1) EP0227801A1 (fr)
AU (1) AU6123286A (fr)
CA (1) CA1257096A (fr)
WO (1) WO1986007574A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63203582A (ja) * 1987-02-10 1988-08-23 日本エンヂニヤ−・サ−ビス株式会社 漏洩検知機構を有する地下タンク
GB2202263B (en) * 1987-02-10 1991-04-10 Nippon Eng Service Underground tank with leak detection mechanism
US4958957A (en) * 1989-03-01 1990-09-25 Sun Refining & Marketing Company System for underground storage and delivery of liquid product, and recovery of leakage
US5220823A (en) * 1989-12-01 1993-06-22 Xerxes Corporation Double walled underground storage tank
CA2022258A1 (fr) * 1989-12-01 1991-06-02 Robin Berg Reservoir de stockage souterrain a double paroi
JPH05505375A (ja) * 1990-10-12 1993-08-12 オーエンス・コーニング　フアイバーグラス　コーポレーシヨン 二次閉込めを備えた地下貯蔵タンク
US7494024B2 (en) 2003-12-08 2009-02-24 General Holdings Co. Additional containment system for storage tank
ITRM20080015A1 (it) 2008-01-09 2009-07-10 Manzi Aurelio S R L Serbatoio perfezionato per il contenimento di liquidi, in particolare petrolio, benzine e idrocarburi in genere.

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US3372075A (en) * 1964-03-06 1968-03-05 Amercoat Corp Method of making an insulated storage tank
US3392865A (en) * 1965-10-29 1968-07-16 Nasa Usa Filament-wound container
US3796620A (en) * 1972-02-03 1974-03-12 Owens Corning Fiberglass Corp Method and apparatus for guiding feed stock to a longitudinally moving collection surface
US4050607A (en) * 1972-04-07 1977-09-27 The Dow Chemical Company Insulation of vessels having curved surfaces
CA1005373A (en) * 1973-03-17 1977-02-15 Kihei Katsuta Tank for storing low-temperature liquids
US4110739A (en) * 1976-08-02 1978-08-29 Kidd John A Means for detecting leakage in the inner lining of tanks and piping
US4523454A (en) * 1983-10-21 1985-06-18 Sharp Bruce R External jacket system as secondary containment for storage tanks

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8607574A1 *

Also Published As

Publication number Publication date
AU6123286A (en) 1987-01-13
WO1986007574A1 (fr) 1986-12-31
CA1257096A (fr) 1989-07-11

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