CA2454084A1 - Storage tank roof protection system - Google Patents
Storage tank roof protection system Download PDFInfo
- Publication number
- CA2454084A1 CA2454084A1 CA002454084A CA2454084A CA2454084A1 CA 2454084 A1 CA2454084 A1 CA 2454084A1 CA 002454084 A CA002454084 A CA 002454084A CA 2454084 A CA2454084 A CA 2454084A CA 2454084 A1 CA2454084 A1 CA 2454084A1
- Authority
- CA
- Canada
- Prior art keywords
- roof
- liner
- tank
- membrane
- gases
- 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.)
- Abandoned
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/02—Containers for fluids or gases; Supports therefor
- E04H7/04—Containers for fluids or gases; Supports therefor mainly of metal
- E04H7/06—Containers for fluids or gases; Supports therefor mainly of metal with vertical axis
- E04H7/065—Containers for fluids or gases; Supports therefor mainly of metal with vertical axis roof constructions
Abstract
A system and method for suspending and sealing a liner below the roof of a tank for protecting the liner from fluids contained within the tank. The liner is a geosynthetic membrane, which is impervious to fluids, and provide a continuous barrier between the fluids and the inner surface of the roof. The liner is suspended between compression seals at the periphery of the tank.
Further, cables are attached at the walls of the tank above or below the liner to support the suspended liner. The liner is sealed about any discontinuities, such as ventilation openings or access to the inside of the tank in the roof. Optionally, ventilation is also provided to the space above the liner by providing vents in the roof which do not extend through the liner.
Further, cables are attached at the walls of the tank above or below the liner to support the suspended liner. The liner is sealed about any discontinuities, such as ventilation openings or access to the inside of the tank in the roof. Optionally, ventilation is also provided to the space above the liner by providing vents in the roof which do not extend through the liner.
Description
1 ST~ E T~.N~~F RTECTIN IfSTE
2
3 ~IELi3 C~~ THE INVENTIC>N
4 The invention, involves methodology ,and apparatus for providing protection of interior roof :surfaces in structural enclcasures such as tanks, more 6 particularly for sealing inner roof surfaces and disconitinuities in the roof of tfie tank 7 from the gases or condensc~tes that emanafe from the fluids and gases contained in 8 the vessel.
BACI~~R(~IJN~ ~F THE INVEI~ITif3N
~ 1 This invention relates to storage tanks that contain a variety o~f fluids 12 that emit gases or condensates and that have overheG~d roof structures to cover and 13 protect the containment vessel and ifs contents. The interior surfaces on the roaofs of 14 such vessels are subject to corrosion and deteriorailion the°ough contact with the gases or condensates that emanate from the fluids an~o' gasE:S that are contained in 16 the vessel.
17 The prior art methodology for protecting the inner surface of thE: roofs 18 from gases or condensates is to apply a coat of paint;, chemicals or other materials 19 to the inner surface of the roof andlor fo any structures that support the inner surface of the roof. The paint, chemicals or other materials ere resistant to corrosion and 21 deterioration from the gases or condensates. The prf:paration of roof surfaces for 22 coating is difficult, time consuming and costly, particularly as the supporting 23 structures for such roofs can be complex and inaccessible. As a result the 1 application of coatings to interior roof surFaces and their supporting structures are 2 prone to failure from peeling, cracking, or other deterioration..
3 A second alaproach is to remove ar'd replace the corroded roof 4. structure with a new roof structure. Again, this approach is very costly, and results in the tank remaining out of operation for considerable periods of time.
6 A third approach is to inject a gas blanket inside the tank that prevents 7 or minimizes the escape of gases or condensates from the fluids in the tank.
This 8 approach requires special construction of the tank, and has limited application to 9 certain fluids and gases.
A fourth approach is to attach a continuous layer of geosynthetic 11 membrane to the roof, andlor supporting structures of roofs a sing sealing systems for 12 floors and walls as described in Provisional Patent Application 60/462,301 around 13 the perimeter of the membrane and discontinuities. Structural support to the 14 membrane is provided by attaching the membrane directly tf~ the interior surFace of '15 the roof, or to the structures supporting the roof. This method proves to be a costly 16 and difficult process. Inherent in this approach is the creation of many 17 discontinuities in the membrane increasing the risks ~of perrneability and functional 18 failure.
19 There is a need for a system which protects and seals interior roof surfaces in structural enclosures such as tanks, morE; particularly for sealing inner 21 roof surtaces around inner roof perimeters and discontinuities in the roof of the tank 22 from the gases or condensate that emanate from the fluids and gases are contained 1 in the vessel, and which is not susceptible to the costs and failures associated with 2 prior art.
3 This invention involves the use of geosynthetic membranEa, and 4 technologies used to seal such membranes to tank surfaces as described in prior patent applications along with a system of suspending the membranes in tree tank, 6 so as to protect the interio~° surfaces of the tank roof from the gases or condensate that emanate from the fluida; and gases contained in the vessel.
2 The objects of the invention are achieved through a liner system that 3 creates an impermeable be~rrier of geosynthetic material that is suspended or' upheld 4 below the inner surface of the roof and around discontinuities in the structural envelope of the roof, if such exist. The liner system is sealed to the upper perimeter 6 of the tank so as to form an impenetrable layer to liquids, or gases or condensates a that may emanate from the. vessel to the interior surfe~ces and structures of the roof 8 of the tank.
9 The roof seal invention consists of two main elements. The first 1a element consists of a geosynthetic membrane, fabric=~ted and suspended in such a 11 way as to provide a continuous, impermeable layer that completely and contirmously 12 separates the lower internal environment of the storage vessel containing fluids and 13 gases, from the upper internal environment of the storage vessel and the roof. The 14 formation of a layer that separates the lower region c~f the structural envelope from '15 the upper region of the structural envelope requires ;a membrane that contains no 16 discontinuities, and which extends at least to the extremities of the structural 17 envelope.
18 The second element consists of a series of attachments to sealably 19 attach the extremities of the membrane. The outer exi:remities of the membrane are 20 sealably attached to the inner surface of the structural envelope, while the inner 21 surface can be attached to a center column of the tank, at some point below the roof 22 of the structural envelope. By sealing at the extremities ofi the liner, a reliable 23 continuous membrane liner is the result.
1 ~ne potential method of perimeter attachment, among many, is an 2 adaptation of mechanical attachments or seals dEacribed in Provisional Patent 8 Application 601462,301 to applicants. In addition, tanks may contain other internal 4 penetrations or connections between the roof of the tank and the lower regions of the tank, such as support columns, gage boards, or pipes. The continuous 6 geosynthetic membrane must be sealed to such penetrations so as to maintain an 7 impenetrable barrier between the lower internal environment of the storage vessel 8 containing fluids and gases, and the upper internal environment of the storage 9 vessel and the roof. This may be achieved by any number of sealing methods.
A preferred embodiment of the invention add s a supporting structure 11 that suspends the membrane above the lower internal environment of the structural 12 envelope. Such supporting elements may consist of elements within the 13 geosynthetic material itself that provide strength and integrity to the barrier, external 14 supports such as tensioned filaments, cables, or rigid supports, capable of 'I5 supporting or lifting the weight of the geosynthetic material. Ullhile some geosynthetic 16 materials contain filaments or structures designed to provide the material itself with 17 sufficient lateral strength to withstand the lateral forces of being suspended, the use 18 of external structures, such as tension cables, or rigid supports, minimize stress on 19 the material itself, and provide better control of the po:~itioning and installation of the material within the tank envir onment.
21 Structures to support the material can be attached to the interior of the 22 structural envelope, above or below the continuous synthetic membrane, and the
BACI~~R(~IJN~ ~F THE INVEI~ITif3N
~ 1 This invention relates to storage tanks that contain a variety o~f fluids 12 that emit gases or condensates and that have overheG~d roof structures to cover and 13 protect the containment vessel and ifs contents. The interior surfaces on the roaofs of 14 such vessels are subject to corrosion and deteriorailion the°ough contact with the gases or condensates that emanate from the fluids an~o' gasE:S that are contained in 16 the vessel.
17 The prior art methodology for protecting the inner surface of thE: roofs 18 from gases or condensates is to apply a coat of paint;, chemicals or other materials 19 to the inner surface of the roof andlor fo any structures that support the inner surface of the roof. The paint, chemicals or other materials ere resistant to corrosion and 21 deterioration from the gases or condensates. The prf:paration of roof surfaces for 22 coating is difficult, time consuming and costly, particularly as the supporting 23 structures for such roofs can be complex and inaccessible. As a result the 1 application of coatings to interior roof surFaces and their supporting structures are 2 prone to failure from peeling, cracking, or other deterioration..
3 A second alaproach is to remove ar'd replace the corroded roof 4. structure with a new roof structure. Again, this approach is very costly, and results in the tank remaining out of operation for considerable periods of time.
6 A third approach is to inject a gas blanket inside the tank that prevents 7 or minimizes the escape of gases or condensates from the fluids in the tank.
This 8 approach requires special construction of the tank, and has limited application to 9 certain fluids and gases.
A fourth approach is to attach a continuous layer of geosynthetic 11 membrane to the roof, andlor supporting structures of roofs a sing sealing systems for 12 floors and walls as described in Provisional Patent Application 60/462,301 around 13 the perimeter of the membrane and discontinuities. Structural support to the 14 membrane is provided by attaching the membrane directly tf~ the interior surFace of '15 the roof, or to the structures supporting the roof. This method proves to be a costly 16 and difficult process. Inherent in this approach is the creation of many 17 discontinuities in the membrane increasing the risks ~of perrneability and functional 18 failure.
19 There is a need for a system which protects and seals interior roof surfaces in structural enclosures such as tanks, morE; particularly for sealing inner 21 roof surtaces around inner roof perimeters and discontinuities in the roof of the tank 22 from the gases or condensate that emanate from the fluids and gases are contained 1 in the vessel, and which is not susceptible to the costs and failures associated with 2 prior art.
3 This invention involves the use of geosynthetic membranEa, and 4 technologies used to seal such membranes to tank surfaces as described in prior patent applications along with a system of suspending the membranes in tree tank, 6 so as to protect the interio~° surfaces of the tank roof from the gases or condensate that emanate from the fluida; and gases contained in the vessel.
2 The objects of the invention are achieved through a liner system that 3 creates an impermeable be~rrier of geosynthetic material that is suspended or' upheld 4 below the inner surface of the roof and around discontinuities in the structural envelope of the roof, if such exist. The liner system is sealed to the upper perimeter 6 of the tank so as to form an impenetrable layer to liquids, or gases or condensates a that may emanate from the. vessel to the interior surfe~ces and structures of the roof 8 of the tank.
9 The roof seal invention consists of two main elements. The first 1a element consists of a geosynthetic membrane, fabric=~ted and suspended in such a 11 way as to provide a continuous, impermeable layer that completely and contirmously 12 separates the lower internal environment of the storage vessel containing fluids and 13 gases, from the upper internal environment of the storage vessel and the roof. The 14 formation of a layer that separates the lower region c~f the structural envelope from '15 the upper region of the structural envelope requires ;a membrane that contains no 16 discontinuities, and which extends at least to the extremities of the structural 17 envelope.
18 The second element consists of a series of attachments to sealably 19 attach the extremities of the membrane. The outer exi:remities of the membrane are 20 sealably attached to the inner surface of the structural envelope, while the inner 21 surface can be attached to a center column of the tank, at some point below the roof 22 of the structural envelope. By sealing at the extremities ofi the liner, a reliable 23 continuous membrane liner is the result.
1 ~ne potential method of perimeter attachment, among many, is an 2 adaptation of mechanical attachments or seals dEacribed in Provisional Patent 8 Application 601462,301 to applicants. In addition, tanks may contain other internal 4 penetrations or connections between the roof of the tank and the lower regions of the tank, such as support columns, gage boards, or pipes. The continuous 6 geosynthetic membrane must be sealed to such penetrations so as to maintain an 7 impenetrable barrier between the lower internal environment of the storage vessel 8 containing fluids and gases, and the upper internal environment of the storage 9 vessel and the roof. This may be achieved by any number of sealing methods.
A preferred embodiment of the invention add s a supporting structure 11 that suspends the membrane above the lower internal environment of the structural 12 envelope. Such supporting elements may consist of elements within the 13 geosynthetic material itself that provide strength and integrity to the barrier, external 14 supports such as tensioned filaments, cables, or rigid supports, capable of 'I5 supporting or lifting the weight of the geosynthetic material. Ullhile some geosynthetic 16 materials contain filaments or structures designed to provide the material itself with 17 sufficient lateral strength to withstand the lateral forces of being suspended, the use 18 of external structures, such as tension cables, or rigid supports, minimize stress on 19 the material itself, and provide better control of the po:~itioning and installation of the material within the tank envir onment.
21 Structures to support the material can be attached to the interior of the 22 structural envelope, above or below the continuous synthetic membrane, and the
5 1 membrane can rest on the supporting elements, or be supported by the supporting 2 elements with various methods of attachment from above.
3 Another embodiment of the invention envisages a system of ventilating the upper region of the structure! envelope above geosynthetic membrane from outside the tank, ensuring that minute permeations of gases or elements that pass
3 Another embodiment of the invention envisages a system of ventilating the upper region of the structure! envelope above geosynthetic membrane from outside the tank, ensuring that minute permeations of gases or elements that pass
6 through the geosynthetic membrane do not accumulate above the geosynthetic
7 membrane, resulting in corrosion and deterioration of the interior surface of the roof.
8 Such ventilation systems may be simply apertures in the upper regions, allowing the
9 flow of air, or any variety of active ventilation systems as those used in rigid roof 1Q structures for homes or other commercial buildings requiring ventilation.
11 An alternate embodiment of the invention includes the use of a boot of 12 liner material to seal discontinuities within the tank roof that penetrate tPee liner 13 membrane. The boot is welded or similarly attached to the liner membrane at the 14 penetration to the membrane, and is mechanically sealed or' attached to the roof or discontinuity. This provides a continuously sealed liner membrane about the 16 discontinuity preventing the discontinuity and upper 'tank region from corrosion or 17 damage from tank liquids, gases, or condensates.
A system for installing a roof liner includes attaching and sealing a 19 membrane adjacent an attachment or discontinuity on the roof, attaching support 2~ elements within the interior of the envelope, raisirn~ the support elements and membrane to the tanks periphery, securing the supporfi elements to the tank's 22 periphery and sealing fihe membrane to the tank.
1 E~RIEF ~ESCRIPTION OF ThIE C~ IPVII~GS
2 Figure 1 is a sectional view of a roof liner showing the main elements 3 of the roof liner;
4 Figure ~ shows a roof liner with suspended cables undet-neath for supporting the roof liner;
8 Figure 3 shows a view from underneath a roof finer suspended over 7 tension cable supports, along with detail on cable attachment;
8 Figure 4 shov~rs details of the sealing of the geosynthetic membrane to 9 the perimeter of a tank by means of a mechanical compression system, and details of the attachment of a cable directly to the mechanical compression system;
11 Figure 5 shows one form of attachment of the geosynthetic liner to a 12 discontinuity;
13 Figure 6 shows a variation of Figure 6, attachment of the geosynthetic 14 liner to a discontinuity;
Figure 7 shows a form of the invention utilizing vents in the upper '~ 6 region of the tank to ventilate the region above the roof liner.
DETAILED DE~CRIPTI~N t7F THE PREFEIRRED EMB~DIMENT
11 An alternate embodiment of the invention includes the use of a boot of 12 liner material to seal discontinuities within the tank roof that penetrate tPee liner 13 membrane. The boot is welded or similarly attached to the liner membrane at the 14 penetration to the membrane, and is mechanically sealed or' attached to the roof or discontinuity. This provides a continuously sealed liner membrane about the 16 discontinuity preventing the discontinuity and upper 'tank region from corrosion or 17 damage from tank liquids, gases, or condensates.
A system for installing a roof liner includes attaching and sealing a 19 membrane adjacent an attachment or discontinuity on the roof, attaching support 2~ elements within the interior of the envelope, raisirn~ the support elements and membrane to the tanks periphery, securing the supporfi elements to the tank's 22 periphery and sealing fihe membrane to the tank.
1 E~RIEF ~ESCRIPTION OF ThIE C~ IPVII~GS
2 Figure 1 is a sectional view of a roof liner showing the main elements 3 of the roof liner;
4 Figure ~ shows a roof liner with suspended cables undet-neath for supporting the roof liner;
8 Figure 3 shows a view from underneath a roof finer suspended over 7 tension cable supports, along with detail on cable attachment;
8 Figure 4 shov~rs details of the sealing of the geosynthetic membrane to 9 the perimeter of a tank by means of a mechanical compression system, and details of the attachment of a cable directly to the mechanical compression system;
11 Figure 5 shows one form of attachment of the geosynthetic liner to a 12 discontinuity;
13 Figure 6 shows a variation of Figure 6, attachment of the geosynthetic 14 liner to a discontinuity;
Figure 7 shows a form of the invention utilizing vents in the upper '~ 6 region of the tank to ventilate the region above the roof liner.
DETAILED DE~CRIPTI~N t7F THE PREFEIRRED EMB~DIMENT
Claims (3)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A system for separating the lower regions of a containment vessel that contain liquids and gases, from the upper regions of a containment vessel that are in contact with the roof over the containment vessel, by the suspension of a continuous and impermeable geosynthetic material that is sealed to the extremities of the structural envelope below the roof, and that is sealed in and around any discontinuities or elements that pass from the upper regions of the structural envelope, to the lower regions of the structural envelope, the system comprising:
a continuous and impermeable geosynthetic membrane that is suspended so as to extend to the extremities of the structural envelope that separates the roof from the lower regions of the storage vessel;
a series of attachments whereby the outer extremities of the membrane is sealably attached to the inner surface of the structural envelope, at some point below the roof of the structural envelope
a continuous and impermeable geosynthetic membrane that is suspended so as to extend to the extremities of the structural envelope that separates the roof from the lower regions of the storage vessel;
a series of attachments whereby the outer extremities of the membrane is sealably attached to the inner surface of the structural envelope, at some point below the roof of the structural envelope
2. The system of claim 1 with the addition of elements to support, sustain, or position the continuous and impermeable geosynthetic membrane.
3. The system of claim 1 or claim 2 wherein is added a system of ventilating the gases in the region of the structural envelope above the suspended geosynthetic membrane
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US52849203P | 2003-12-11 | 2003-12-11 | |
| US60/528492 | 2003-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2454084A1 true CA2454084A1 (en) | 2005-06-11 |
Family
ID=34633007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002454084A Abandoned CA2454084A1 (en) | 2003-12-11 | 2003-12-23 | Storage tank roof protection system |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20050131749A1 (en) |
| CA (1) | CA2454084A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7934619B1 (en) * | 2008-09-09 | 2011-05-03 | All State Tank Manufacturing, LLC | Cable supported multi-chamber waste water tank |
| EP2826353B1 (en) | 2014-04-24 | 2016-05-25 | AGROTEL GmbH | Cover for reservoir |
| CN105857988B (en) * | 2016-05-18 | 2018-11-27 | 碧海舟（北京）节能环保装备有限公司 | Organic volatile VOCs zero-emission fluid reservoir |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2867346A (en) * | 1954-10-06 | 1959-01-06 | British Petroleum Co | Floating plastic screen |
| US4163505A (en) * | 1977-09-23 | 1979-08-07 | Arnold Gunther | Foldable liners for fluids holding storage tanks |
| US4438863A (en) * | 1981-08-17 | 1984-03-27 | Globe Linings, Inc. | Gas venting floating cover |
| US4437987A (en) * | 1982-07-01 | 1984-03-20 | Thornton Marvin L | Anaerobic digester gas collection and storage systems |
| FR2570682B1 (en) * | 1984-09-27 | 1987-01-09 | Electricite De France | IMPROVEMENT IN TANKS WITH FLOATING ROOF FOR LIQUIDS, IN PARTICULAR IN STORAGE TANKS USED IN THE ELECTRONUCLEAR FIELD |
| US4648968A (en) * | 1985-12-26 | 1987-03-10 | Chicago Bridge & Iron Company | Floating cover tank with guides for vertical displacement of the cover |
| DE3720302A1 (en) * | 1987-06-19 | 1988-12-29 | Imhof Ingbuero Gmbh | INTERIOR FLOATING COVER |
| US4809734A (en) * | 1988-09-28 | 1989-03-07 | Cliff John O | Condensate-collecting ceiling for elevated water tower facility |
-
2003
- 2003-12-23 CA CA002454084A patent/CA2454084A1/en not_active Abandoned
-
2004
- 2004-12-10 US US11/008,107 patent/US20050131749A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20050131749A1 (en) | 2005-06-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |