EP0431258A2 - Reservoir de stockage souterrain à double paroi - Google Patents
Reservoir de stockage souterrain à double paroi Download PDFInfo
- Publication number
- EP0431258A2 EP0431258A2 EP90114377A EP90114377A EP0431258A2 EP 0431258 A2 EP0431258 A2 EP 0431258A2 EP 90114377 A EP90114377 A EP 90114377A EP 90114377 A EP90114377 A EP 90114377A EP 0431258 A2 EP0431258 A2 EP 0431258A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- load
- storage tank
- tank
- underground storage
- annular space
- 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- Withdrawn
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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
- B65D90/48—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
- B65D88/00—Large containers
- B65D88/76—Large containers for use underground
Definitions
- This invention pertains to tanks or containers designed to contain liquids, underground, for dispensing. Specifically, a double walled tank, for the containment and dispensing of petroleum products, is addressed.
- tanks of generally cylindrical design, are prepared and installed in a pit, subsequently covered, said tanks having been provided with fittings, piping, valves and the like, such that gasoline or similar fuel products can be introduced to the interior of the tank, and then dispensed, under control.
- these tanks were prepared from steel. Steel continues to be a popular material from which to construct the storage tanks.
- cryogenic containers intended for above-ground storage, such as for the storage and/or transportation of cryogenic materials. While both types of containers must have sufficient strength to contain the liquid in the interior, these cryogenic containers are generally constructed without regard to, or need to safeguard against, pressures and corrosive agents applied from the exterior, as in the case with underground storage tanks.
- U.S. Patents 3,895,152 and 3,317,074 are exemplary references discussing cryogenic containers.
- the use of fiber reinforced plastic materials for the construction of underground storage tanks has not totally eliminated the problem of environmental contamination or pollution.
- the tanks of the prior art although exhibiting superior resistance to corrosive attack, nonetheless remain potentially subject to cracking and/or holing, particularly during handling, as well as after installation.
- the rough treatment a tank may receive during transportation and manipulation prior to installation may result in undetected punctures of the tank.
- a shift in the bed may result in fracturing or holing of the tank, resulting in the spillage and resulting hazards addressed in U.S. Patent 3,700,512.
- the gas pervious material is not load-transferring, and strength is again provided by securing the outer tank wall to the ribs. Since both tanks have to be resistant to leakage or penetration, this implies that both tanks must have, independent, sufficient strength to resist puncture, fracture and compression, as they cannot share strength, no load being transmitted across the space between the two tanks, save for the limited case of the ribs. While the presence of the ribs may be employed to reduce deflection therebetween, spacing of the ribs does not permit a load or impact at a point between the ribs applied to, e.g., the outer tank, to be transmitted to, or shared with, the inner tank. Similarly, loads or impact supplied to the inner tank, cannot be shared by the outer tank. This results in independently strengthened inner and outer shells, and a significant consumption of material and man hours.
- a double walled tank capable of being equipped with either a dry or wet alarm system, which comprises a inner and outer shell, between which load may be transmitted and shared, so as to reduce the need to provide two entirely independent tanks, and reduce the material, and man hours, involved in their construction.
- the material should be capable of taking up resin, and curing against the tank.
- the resin-infiltrated load-transmitting material should be capable of passing petroleum liquids. That is, within a relatively short period of time, regardless of the point of the leak on the interior tank, the petroleum products stored therein should be capable of passing along the space between the two tanks, through the load-transmitting material, to the bottom of the tank, under the influence of gravity, to contact the dry alarm system situated thereat.
- the load-transmitting material In order to equip the tank with a wet alarm system, the load-transmitting material must be capable of water passage therethrough, i.e., in the ideal state, a continuous liquid, preferably aqueous, phase must be present in the load-transmitting material, without loss of load-transmitting characteristics.
- One exemplary material for the load-transmitting filler is an non-woven composite felt or system, produced by Ozite Corporation, of Illinois, under the name CompozitexTM.
- This material is conventionally sold as a structural element, for use, e.g., in the preparation of insulation and the like. It is selected for use in this invention because of its combination of load-transmitting capabilities, its easy impregnation, adherence and curing with resin, and its transparency to water, or stored petroleum products. In this regard, such products should be porous.
- Compozitex TM is apparently made sufficiently porous by needling.
- the Figure is a representational plan view of an underground storage tank, bearing external ribs, and a load-transmitting substance filling the space between inner and outer shells.
- the underground storage tank of this invention is broadly illustrated in the Figure. It consists of an outer tank, 10, comprised of chopped fiberglass-reinforced resin, which has been cured up, of similar or identical composition to inner tank wall 14. Lying between, and adhered to both walls, is the load-transmitting material 12, entirely filling the annular space between tank walls 10 and 14. Ideally, these tanks bear external ribs 16, for reinforcement, and to prevent deflection. The number, and placement, of ribs 16, will vary with tank diameter and length.
- Outer shell 10 can be prepared through a female molding process, such as that disclosed in U.S. Patent 4,363,687, the entire content of which is incorporated herein, by reference.
- a half mold corresponding to the topography of one-half of the length of tank 1, is provided with an internal lining or release agent, making detachment of the mold from the finished shell possible.
- a mixture of discontinuous fibers generally a fiberglass roving or similar material, and resin
- the resin is in the form of a liquid mixture, also containing a catalyst, for auto-curing of the mixture.
- the female mold is caused to rotate about its longitudinal axis, while the wall material is sprayed from a central position, which passes along the length of the mold.
- This is semi-cured, to a tacky condition, at which time the load-transmitting material, such as CompozitexTM, is applied thereto.
- the load-transmitting material such as CompozitexTM
- this material is a workable felt, which can be provided in long strips, sheets, etc., it is a straightforward operation simply to place the load-transmitting material against the tacky wall, and then roll out air pockets between the felt and the outer wall, with a conventional roller, similar to those used in painting and the like.
- the load-transmitting material quickly takes up the resin, and is adhered to the outer tank thereby.
- load-transmitting materials such as composite honeycomb or plastic webbing.
- a particularly preferred webbing is available as an extruded net or webbing having continuous passages therethrough.
- One supplier of such material is the Conwed Corporation of Minneapolis, Minnesota. If the material is thermoplastic it may be necessary to alter its surface properties to adhere to the resin of the tank. Similar load-transmitting materials may be used.
- the molding process is resumed, with a first layer of resin or resin rich material applied against the internal surface of the load-transmitting material, to ensure bonding of that phase to the outer surface of the internal wall 14.
- the internal wall 14 is then similarly sprayed up, and the two halves are joined, as is conventional in the art.
- ribs 16 may be prepared according to conventional processes. If there is no manway provided, and the two molded tank halves are mated only from the outside, care must be taken to ensure the annular material 12 is continuous across the joint.
- adhesion of the load-transmitting material to the sides of the tank shells is unnecessary to achieve transmission of the applied load in a direction normal to the surface to which the load is applied.
- the configuration of the tank fixes the material in position. Since the tank, in use, is generally under compression, load will be transmitted across the material. Adhesion of the material to the outer surface of the inner wall and inner surface of the inner wall does impart shear resistance not otherwise obtained, and accordingly remains a preferred embodiment.
- the double wall tank of this invention can be prepared through a male molding process, such as that described in U.S. Patent 4,676,093, column 2, line 11 - column 3, line 4. It should be noted that, unlike that prior patent, there is no need to provide or maintain holes in ribs, or specific passageways.
- the load-transmitting material extends between the rib surfaces of the external and internal shell, and accordingly, where a wet alarm system is desired, the alarm liquid passes through this layer.
- the resulting double wall tank has significantly greater strength against compression than prior double wall tanks, in regions between the ribs of the tank cylinder.
- the outer and inner shell by virtue of the load-transmitting material therebetween, now act together, in resisting applied force.
- the thickness of at least one of the two shells is reduced to that of a liner.
- the thickness of both shells may be reduced sharply to provide a symmetrical system. In any event, the total consumption of material is significantly reduced over currently available systems.
- the internal shell 14 has a thickness of about 3/16 inch
- the load-transmitting material has a thickness of about a 1/8 inch
- the exterior tank has a thickness of about 1/4 inch.
- the total annular space is sharply reduced in the invention, over prior art systems.
- CompozitexTM a total value of perhaps 270-300 gallons is required to fill the space of a 10,000 gallon tank, as opposed to 1,000 gallons or more for prior art systems.
- the entire tank can be monitored by one alarm means, without the need to provide passageways through the ribs, as envisioned in U.S. Patent 4,739,659.
- the volume will range from 100-300 gallons. This is not only more economical, it renders the system with a wet alarm more sensitive to leakage.
- a storage tank of this design can be shipped from the factory with its annulus filled, a great advantage over prior systems.
- a leak sensor such as that described in U.S. Patent 4,672,366 may be employed.
- Alternative systems may be used.
- U.S. Patent 4,672,366 a sensor cable, comprised of a twisted pair of conductors separated by insulation materials is placed at the bottom of the tank.
- the insulating materials are specially designed to degrade in the presence of petroleum products, such as gasoline and diesel fuels, or other materials to be stored in the tank such as machine oil, and the like. If the inner tank develops a leak, as noted above, the stored petroleum products will pass easily through the load-transmitting layer, under the influence of gravity, to the bottom, where the insulation material will be contacted, and degraded. This causes a change in resistance in the twisted cable, and eventually, a short circuit, which sets off an alarm.
- a wet alarm system such as that described in U.S. Patent 4,676,093, can be employed.
- Wet alarm systems are capable of detecting leaks in either the outer shell 10 or the inner shell 14, or both.
- An exemplary system is described in U.S. Patents 4,676,093 and 1,996,074.
- the space between the inner and outer tank is completely filled with a freely flowing liquid, such as ethylene glycol, water or brine, which may be given a distinctive color, odor, etc.
- the fill line for this space rests above the installation, and can be visually or electronically monitored.
- the space is filled, and the column leading to this space is similarly filled to a predetermined level, above the tank, which may be monitored.
- fittings for filling the interior tank, vapor recovery, level measuring, a manway, if desired, etc. are provided on and through the two tanks.
- Such fittings are well described in the art, and constitute no part of this invention, per se.
- An underground storage tank is provided with a load-transmitting material in the annular space between inner and outer walls.
- the load-transmitting material passes aqueous liquid and the stored product and so may be used with either wet or dry alarm systems.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US444807 | 1982-11-26 | ||
| US44480789A | 1989-12-01 | 1989-12-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0431258A2 true EP0431258A2 (fr) | 1991-06-12 |
| EP0431258A3 EP0431258A3 (en) | 1992-06-03 |
Family
ID=23766438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19900114377 Withdrawn EP0431258A3 (en) | 1989-12-01 | 1990-07-26 | Improved double walled underground storage tank |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0431258A3 (fr) |
| CA (1) | CA2022258A1 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103264848A (zh) * | 2013-06-04 | 2013-08-28 | 连云港中复连众复合材料集团有限公司 | 一种采用液媒介质监测的埋地玻璃钢双壁储油罐及其制备方法 |
| CN116293398A (zh) * | 2023-03-31 | 2023-06-23 | 一汽解放汽车有限公司 | 一种椭圆形lng气瓶 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2558737C3 (de) * | 1975-12-24 | 1984-04-05 | Haase, Harry, 2350 Neumünster | Doppelwandiger unterirdischer Lagerbehälter für grundwassergefährdende Flüssigkeiten wie Heizöl |
| EP0227801A1 (fr) * | 1985-06-17 | 1987-07-08 | SHARP, Bruce R. | Reservoir de stockage a double paroi formant un compartiment de contenance secondaire |
| US4844287A (en) * | 1987-11-13 | 1989-07-04 | Long Delmar D | Leak containment system for underground storage tanks |
| US4974739A (en) * | 1988-07-15 | 1990-12-04 | Ozite Corporation | Storage tank and method of making a storage tank |
-
1990
- 1990-07-25 CA CA002022258A patent/CA2022258A1/fr not_active Abandoned
- 1990-07-26 EP EP19900114377 patent/EP0431258A3/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103264848A (zh) * | 2013-06-04 | 2013-08-28 | 连云港中复连众复合材料集团有限公司 | 一种采用液媒介质监测的埋地玻璃钢双壁储油罐及其制备方法 |
| CN116293398A (zh) * | 2023-03-31 | 2023-06-23 | 一汽解放汽车有限公司 | 一种椭圆形lng气瓶 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0431258A3 (en) | 1992-06-03 |
| CA2022258A1 (fr) | 1991-06-02 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| AK | Designated contracting states |
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| 17P | Request for examination filed |
Effective date: 19920819 |
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| 17Q | First examination report despatched |
Effective date: 19931008 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19950201 |