The present invention relates generally to a storage tank with a floating roof and related methods and, more particularly, to a storage tank with a floating roof for storing a petroleum product.
Storage systems for a petroleum product, such as crude oil and petrochemicals, generally contain large quantities of fluid, including liquid and gas, at various volumes as this petroleum product is added and/or removed from a storage tank during use. In at least some instances, such storage tanks are fitted with a floating roof configured to rise and fall with the adjusting volumes of the petroleum product contained within the storage tank in order to reduce material loss associated with tank breathing and similarly reduce evaporative loss of the petroleum product while in storage. A floating roof seal may thus be incorporated between the floating roof and a wall of the storage tank for further sealing and containing the petroleum product within the storage tank. More particularly, a floating roof seal in one example includes a vapor barrier fabric that effectively accommodates movement of the floating roof for improved sealing between the floating roof and the wall of the storage tank.
Due to the harsh environment created at least in part by the petroleum product as well as the desire for durable and effective sealing between the floating roof and the wall of the storage tank, technicians may install thousands of fasteners directly through the vapor barrier fabric in order to effectively secure and seal the vapor barrier fabric in place. Tight clearance in one or more areas around the vapor barrier fabric inhibits the technician's access during installation and, in turn, increases time to build the storage system to full capability and use. Moreover, these fasteners extending directly through the vapor barrier fabric create added stress concentrations in the vapor barrier fabric with any associated holes further weakening the vapor barrier fabric, thereby increasing the likelihood of greater vapor leakage and ultimately premature failure of the vapor barrier fabric.
Accordingly, there is a need for a storage system with a floating roof seal that addresses the present challenges such as those discussed above.
While the specification concludes with claims which particularly point out and distinctly claim this technology, it is believed this technology will be better understood from the following description of certain examples taken in conjunction with the accompanying drawings, in which like reference numerals identify the same elements and in which:
The drawings are not intended to be limiting in any way, and it is contemplated that various embodiments of the technology may be carried out in a variety of other ways, including those not necessarily depicted in the drawings. The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present technology, and together with the description serve to explain the principles of the technology; it being understood, however, that this technology is not limited to the precise arrangements shown.
The following description of certain examples of the technology should not be used to limit its scope. Other examples, features, aspects, embodiments, and advantages of the technology will become apparent to those skilled in the art from the following description, which is by way of illustration, one of the best modes contemplated for carrying out the technology. As will be realized, the technology described herein is capable of other different and obvious aspects, all without departing from the technology. Accordingly, the drawings and descriptions should be regarded as illustrative in nature and not restrictive.
It is further understood that any one or more of the teachings, expressions, embodiments, examples, etc. described herein may be combined with any one or more of the other teachings, expressions, embodiments, examples, etc. that are described herein. The following-described teachings, expressions, embodiments, examples, etc. should therefore not be viewed in isolation relative to each other. Various suitable ways in which the teachings herein may be combined will be readily apparent to those of ordinary skill in the art in view of the teachings herein. Such modifications and variations are intended to be included within the scope of the claims.
For clarity of disclosure, the terms “vertical,” “horizontal,” and “radial” are defined herein relative to a circular storage tank positioned on a ground surface. In this respect, “lower vertical direction” is toward to the ground, “upper vertical direction” is away from the ground, “left horizontal direction” is circumferentially left parallel to the ground, “right horizontal direction” is circumferentially right parallel to the ground, and “radial direction” is toward or away from an outer wall of the storage tank relative to a central axis of the storage tank. It will be further appreciated that, for convenience and clarity, spatial terms such as “upper,” “lower,” “lateral,” “inner,” “outer,” “leftward,” “rightward,” and “central” also are used herein for reference to relative positions and directions. Such terms are used below with reference to views as illustrated for clarity and are not intended to limit the invention described herein.
Aspects of the present examples described herein may be integrated into a storage system for a petroleum product, such as such as crude oil, which may also be referred to herein as petroleum, refined petroleum, which may also be referred to herein as petrochemicals, and generally any volatile, flammable chemical with a low vapor pressure. More broadly, such aspects may be incorporated into any such storage system including a floating roof for fluidly sealing the floating roof to a tank wall. As used herein the term “fluidly sealing” and “sealing” refers to a sufficient seal for storing petrochemicals as will be appreciated by one of ordinary skill in the art. At least some leakage of vapor, such as petrochemical related vapors, may occur in use and still be considered “fluidly sealed” and “sealed” for the purpose of the examples described below and integrated into an exemplary storage system. The invention is thus not intended to be unnecessary limited to a complete, perfect fluid seal being formed by a floating roof seal nor should the invention be unnecessarily limited to use with petroleum products.
As shown more particularly in
An inner coupling assembly (30) of floating roof seal (22) secures vapor barrier fabric (28) to floating roof (20), whereas an outer coupling assembly (32) of floating roof seal (22) secures vapor barrier fabric (28) to shoe assembly (24). More particularly, outer coupling assembly (32) circumferentially holds vapor barrier fabric (28) resiliently in compression as discussed below such that no fasteners extend through vapor barrier fabric (28), thereby simplifying installation and removal of vapor barrier fabric (28) by a technician while also improving sealing capabilities for increased fluid seal therebetween that similarly reduces the deleterious impact of at least a portion of petroleum product otherwise being released into a surrounding environment.
While the following discusses aspects of floating roof seal (22) in greater detail with respect to planar arrangements of one or more shoes (26) and corresponding sections of floating roof seal (22), it will be appreciated that these arrangements may be successively repeated, positioned alongside each other, and curved to accommodate an inner curvature of tank wall (14). Thus, the present example of outer coupling assembly (32) is free of fasteners extending through an entire circumferential edge portion of vapor barrier fabric (28) such that no holes extend through this entire circumferential edge portion of vapor barrier fabric (28). Alternatively, some fasteners may be used in other examples through vapor barrier fabric (28) such that the invention is not intended to be unnecessarily limited to only being free of such fasteners and/or holes extending therethrough. Furthermore, one or more aspects of outer coupling assembly (32) may be similarly incorporated into inner coupling assembly (30) such that at least some portions of inner coupling assembly (30) may alternatively or additionally clamp against vapor barrier fabric (28) without fasteners and/or holes extending through vapor barrier fabric (28). The invention is thus not intended to be unnecessarily limited to the particular outer coupling assembly (32) and/or inner coupling assembly (30) shown and described herein.
As shown in
With respect to attachment of shoes (26), each hanger (34) includes a hanger roof mount (42), a hanger base bracket (44), a hanger actuation bracket (46), and a hanger shoe mount (48). Hanger actuation bracket (46) is pivotally connected to each of hanger shoe mount (48) and hanger base bracket (44) via a mount pin (50) and a bracket pin (52), respectively. Thus, as floating roof (20) shifts horizontally during use, hangers (34) both suspend shoe assembly (24) from floating roof (20) and allow local horizontal and radial expansion and contraction such that each shoe (26) remains engaged with the inner surface of tank wall (14) (see
To this end, each shoe (26) more particularly includes a shoe plate (54), a lower shoe flange (56) extending downward from shoe plate (54), and an upper shoe flange (58) extending upward from shoe plate (54). While shoe plate (54) extends generally in a vertical direction so as to extend parallel in engagement with tank wall (14) (see
Vapor barrier fabric (28) also extends from floating roof (20) for securement to shoe assembly (24) via outer coupling assembly (32) as discussed briefly above. More particularly, outer coupling assembly (32) includes a plurality of shoe mount brackets (60) and a plurality of exemplary barrier securements (62), each of which is more specifically is a barrier securement clip (62) in the present example. With respect to each shoe (26), barrier securement clip (62) is configured releasably couple with shoe mount bracket (60) to compress an outer edge portion (63) of vapor barrier fabric (28) therebetween in order to secure vapor barrier fabric (28) to shoe plate (54) and further form the fluid seal with vapor barrier fabric (28).
With respect to
Whereas shoe mount bracket (60) has fasteners (74) extending therethrough, barrier securement clip (62) of the present example is free of fasteners extending therethrough and configured to releasably affix to shoe mount bracket (60) by resiliently clipping onto shoe mount bracket (60). Specifically, barrier securement clip (62) has a clip plate (76), a lower barrier catch (78), and an upper barrier catch (80). Clip plate (76) extends generally in the vertical direction, whereas lower barrier catch (78) extends downward therefrom and radially outward at an angle relative to clip plate (76) toward base plate (64). In contrast, upper barrier catch (80) extends upward from clip plate (76), but also radially outward at an angle relative to clip plate (76) toward base plate (64). In the present example, lower and upper barrier catches (78, 80) are in the form of flanges extending along clip plate (76). Each clip plate (76) has a plurality of such lower barrier catches (78) at least partially separated by gaps. Similarly, each clip plate (76) has a plurality of such upper barrier catches (80) at least partially separated by gaps. Such gaps may provide for greater deflection and/or flexibility along barrier securement clip (62) for ease of installation and/or removal from shoe mount bracket (60). Alternative examples of barrier securement clip (62) may be free of such gaps, such that the invention is not intended to be unnecessarily limited to the particular arrangement of lower and upper barrier catches (78, 80) as shown and described herein.
Lower and upper barrier catches (78, 80) extend from clip plate (76) and are resiliently biased relative to clip plate (76) to a clamp position as shown in
In addition, barrier securement clip (62) of the present example further includes a grip tab (86) extending upward and radially inward from upper barrier catch (78). Grip tab (86) is configured to be selectively manipulated by a technician to generate a moment about upper resilient portion (84) to deflect upper resilient portion (84) and thereby selectively move upper barrier catch (80) from the clamp position toward the unclamped, installation position. Alternatively or in addition, another grip tab (86) may similarly extend from lower barrier catch (78) for similar manipulation. The invention is thus not intended to be unnecessarily limited to the particular grip tab (86) shown in the present example. An arrow (85) may also be included on barrier securement clip (62) to indicate an upward and desired direction of installation for such lower and upper directions, although it will be appreciated that arrow (85) may not be included in one or more examples.
In use,
While the above description of installation of barrier securement clip (62) onto shoe mount bracket (60) applies to one such barrier securement clip (62) and shoe mount bracket (60), this method of installation may then be repeated for each additional barrier securement clip (62) and shoe mount bracket (60) about an entire circumference of outer edge portion (63) of vapor barrier fabric (28) until vapor barrier fabric (28) is attached to shoe assembly (24) as desired.
Wedge catch (114) further includes a head (120) configured to compress outer edge portion (63) of vapor barrier fabric (28) for fluid sealing thereagainst as well as hook a remaining portion of outer edge portion (63) of vapor barrier fabric (28) for further securement of outer edge portion (63) to shoe (26). More particularly, wedge catch (114) is biased toward upper shoe flange (58) such that outer edge portion (63) of vapor barrier fabric (28) is compressed directly against and between wedge catch (114) and upper shoe flange (58).
In use, technician grips wedge catch (114) and deflects wedge catch (114) relative to wedge base (112) from the clamp position to the installation position to effectively open a space between wedge catch (114) and upper shoe flange (58). Outer edge portion (63) of vapor barrier fabric (28) is inserted through the space and wedge catch (114) is released by the technician from the installation position to the clamp position to fluidly seal and secure outer edge portion (63) of vapor barrier fabric (28) to upper shoe flange (58).
While the above description of installation of one such barrier securement wedge (110) and outer edge portion (63) of vapor barrier fabric (28) is shown in
While the above barrier securement clip (61) of outer coupling assembly (32) is configured to secure outer edge portion (63) of vapor barrier fabric (28) to respective shoes (26) of shoe assembly (24) as shown in
With respect to
Bridge securement clip (216) as shown in
Lower and upper bridge catches (220, 222) extend from bridge plate (218) and are resiliently biased relative to bridge plate (218) to a clamp position as shown in
In addition, bridge securement clip (216) of the present example further includes a grip tab (228) similar in at least some respects to grip tab (86) (see
In use,
Technician then releases grip tab (228) to resiliently return upper bridge catch (222) to the clamp position shown in
Whereas
While the above description of installation of bridge securement clip (216) onto bridge member (214) (see
The following examples relate to various non-exhaustive ways in which the teachings herein may be combined or applied. It should be understood that the following examples are not intended to restrict the coverage of any claims that may be presented at any time in this application or in subsequent filings of this application. No disclaimer is intended. The following examples are being provided for nothing more than merely illustrative purposes. It is contemplated that the various teachings herein may be arranged and applied in numerous other ways. It is also contemplated that some variations may omit certain features referred to in the below examples. Therefore, none of the aspects or features referred to below should be deemed critical unless otherwise explicitly indicated as such at a later date by the inventors or by a successor in interest to the inventors. If any claims are presented in this application or in subsequent filings related to this application that include additional features beyond those referred to below, those additional features shall not be presumed to have been added for any reason relating to patentability.
A storage system for a petroleum product, comprising: (a) a floating roof seal, including: (i) a vapor barrier having a flexible material and configured to extend from a first shoe plate to a floating roof, wherein the vapor barrier has a first barrier portion configured to be clamped, and (ii) a first coupling assembly, including: (A) a first shoe mount bracket configured to be secured to the first shoe plate, and (B) a first barrier securement having a first securement body and a first resilient portion, wherein the first resilient portion is biased toward a first clamp position and configured to selectively deflect relative to the first securement body from the first clamp position to a first installation position, wherein the first barrier securement with the first resilient portion in the first installation position is configured to be received on the first shoe mount bracket such that the first barrier portion is positioned between the first barrier securement and the first shoe mount bracket, and wherein the first barrier securement with the first resilient portion in the first clamp position is configured to compress the first barrier portion against the first shoe mount bracket thereby fluidly sealing the first barrier portion between the first shoe mount bracket and the first barrier securement.
The storage system of Example 1, wherein the first barrier portion of the vapor barrier is free of holes.
The storage system of any one or more of Examples 1 through 2, wherein the first shoe mount bracket includes a first lip, wherein the first barrier securement includes a first catch, and wherein the first catch is configured to hook about the first lip and overlap thereby at least partially securing the first barrier securement to the first shoe mount bracket.
The storage system of Example 3, wherein the first barrier portion is configured to be received between the first catch and the first lip and compressed therebetween.
The storage system of any one or more of Examples 3 through 4, wherein the first shoe mount bracket includes a second lip, wherein the first barrier securement includes a second catch, and wherein the second catch is configured to hook about the second lip and overlap thereby further secure the first barrier securement to the first shoe mount bracket.
The storage system of Example 5, wherein the first barrier portion is configured to be received between the first catch and the first lip and compressed therebetween, and wherein the first barrier portion is further configured to be received between the second catch and the second lip and compressed therebetween.
The storage system of any one or more of Examples 5 through 6, wherein the first lip is vertically opposite from the second lip in a vertical direction, wherein the first catch is vertically opposite from the second catch in the vertical direction, wherein the first catch is configured to radially overlap with the first lip in a radial direction, wherein the second catch is configured to radially overlaps with the second lip in the radial direction, and wherein the radial direction is perpendicular to the vertical direction.
The storage system of any one or more of Examples 5 through 7, wherein the first catch projects from the first securement body, wherein the second catch projects from the first securement body, and wherein at least a portion of the first resilient portion is positioned between the first catch and the first securement body such that the first catch is configured to selectively move relative to the second catch between the first installation position and first clamp position.
The storage system of Example 8, wherein the first barrier securement further includes a grip tab extending from the first catch, wherein the grip tab is configured to be selectively manipulated to thereby selectively move the first catch and deflect the first resilient portion from the first clamp position toward the first installation position.
The storage system of any one or more of Examples 1 through 9, wherein the floating roof seal further includes a first shoe plate configured to engage a tank wall.
The storage system of Example 10, wherein the floating roof seal further includes a hanger configured to connect to each of the first shoe plate and the floating roof.
The storage system of Example 11, further comprising a floating roof, wherein the floating roof seal further includes a second coupling assembly configured to connect the vapor barrier to the floating roof.
The storage system of Example 12, further comprising a tank body configured to receive the floating roof such that the floating roof is operatively connected to the tank body via the floating roof seal.
The storage system of any one or more of Examples 10 through 13, wherein the floating roof seal further includes: (i) a second shoe plate configured to engage the tank wall, (ii) the vapor barrier having second barrier portion configured to be clamped, (iii) the first coupling assembly, further including: (A) a second shoe mount bracket configured to be secured to the second shoe plate, (B) a second barrier securement having a second securement body and a second resilient portion, wherein the second resilient portion is biased toward a second clamp position and configured to selectively deflect relative to the second securement body from the second clamp position to a second installation position, wherein the second barrier securement with the second resilient portion in the second installation position is configured to be received on the second shoe mount bracket such that the second barrier portion is positioned between the second barrier securement and the second shoe mount bracket, and wherein the second barrier securement with the second resilient portion in the second clamp position is configured to compress second barrier portion against the second shoe mount bracket thereby fluidly sealing the second barrier portion between the second shoe mount bracket and the second barrier securement, and (C) a bridge coupling configured to connect to each of the first and second barrier securements to thereby movably secure the first shoe plate relative to the second shoe plate.
The storage system of Example 14, wherein the bridge coupling includes a bridge member and a bridge securement, wherein the bridge member is configured to be slidably received within each of the first and second barrier securements, and wherein the bridge securement is configured to resilient clamp onto each of the first barrier securement, the second barrier securement, and the bridge member such that the first shoe plate is slidable relative to the second shoe plate for accommodating movement of first and second shoe plates during use.
A floating roof seal, comprising: (a) a first shoe plate configured to engage a tank wall; (b) a vapor barrier having a flexible material and a first barrier portion configured to be clamped; and (c) a first coupling assembly including a first barrier securement having a first securement body and a first resilient portion, wherein the first resilient portion is biased toward a first clamp position and configured to selectively deflect relative to the first securement body from the first clamp position to a first installation position, wherein the first barrier securement with the first resilient portion in the first installation position is configured to be unclamped from the vapor barrier for positioning of the vapor barrier relative to the first shoe plate, wherein the first barrier securement with the first resilient portion in the first clamp position compresses against the vapor barrier thereby fluidly sealing the first barrier securement against the first barrier portion without inserting a fastener through the first barrier portion of the vapor barrier.
The floating roof seal of Example 16, wherein the first barrier portion is free of holes.
A method of sealing a floating roof seal for storage of a petroleum product, comprising: (a) deflecting a first resilient portion of a first barrier securement relative to a first securement body of the first barrier securement from a first clamp position to a first installation position, wherein the first resilient portion is biased toward the first clamp position; (b) positioning a first barrier portion of a vapor barrier between the first barrier securement and a first shoe plate, wherein the first shoe plate is configured to engage a tank wall; and (c) releasing the first resilient portion of the first barrier securement such that the first barrier securement compresses against the first barrier portion of the vapor barrier thereby fluidly sealing the first barrier securement against the first barrier portion of the vapor barrier for at least partially sealing the floating roof seal for storage of the petroleum product.
The method of claim 18, further comprising: (a) deflecting a second resilient portion of a second barrier securement relative to a second securement body of the second barrier securement from a second clamp position to a second installation position, wherein the second resilient portion is biased toward the second clamp position; (b) positioning a second barrier portion of the vapor barrier between the second barrier securement and a second shoe plate, wherein the second shoe plate is configured to engage the tank wall; (c) releasing the second resilient portion of the second barrier securement such that the second barrier securement compresses against the second barrier portion of the vapor barrier thereby fluidly sealing the second barrier securement against the second barrier portion of the vapor barrier for at least partially sealing the floating roof seal for storage of the petroleum product; and (d) movably connecting the first shoe plate relative to the second shoe plate with a bridge coupling, wherein the bridge coupling fluidly seals against a third barrier portion of the vapor barrier extending between the first and second barrier portions.
The method of Example 19, wherein each of the first, second, and third barrier portions of the vapor barrier are free of fasteners extending therethrough.
A storage system for a petroleum product, comprising: (a) a floating roof seal, including: (i) a vapor barrier having a flexible material and configured to extend from a first shoe plate to a floating roof and further extend from a second shoe plate to the floating roof, wherein the vapor barrier has a barrier portion configured to be clamped, and (ii) a coupling assembly, including: a bridge coupling, wherein the bridge coupling is configured to extend from the first shoe plate to the second shoe plate and movably secure the barrier portion relative to each of the first and second shoe plate.
It should be appreciated that any patent, publication, or other disclosure material, in whole or in part, that is said to be incorporated by reference herein is incorporated herein only to the extent that the incorporated material does not conflict with existing definitions, statements, or other disclosure material set forth in this disclosure. As such, and to the extent necessary, the disclosure as explicitly set forth herein supersedes any conflicting material incorporated herein by reference. Any material, or portion thereof, that is said to be incorporated by reference herein, but which conflicts with existing definitions, statements, or other disclosure material set forth herein will only be incorporated to the extent that no conflict arises between that incorporated material and the existing disclosure material.
Having shown and described various embodiments of the present invention, further adaptations of the methods and systems described herein may be accomplished by appropriate modifications by one of ordinary skill in the art without departing from the scope of the present invention. Several of such potential modifications have been mentioned, and others will be apparent to those skilled in the art. For instance, the examples, embodiments, geometrics, materials, dimensions, ratios, steps, and the like discussed above are illustrative and are not required. Accordingly, the scope of the present invention should be considered in terms of the following claims and is understood not to be limited to the details of structure and operation shown and described in the specification and drawings.
This application claims priority to U.S. Pat. App. No. 63/225,732, filed on Jul. 26, 2021, entitled “Floating Roof Seal and Related Methods,” the disclosure of which is hereby expressly incorporated by reference herein, in its entirety.
Number | Date | Country | |
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63225732 | Jul 2021 | US |