US3434815A - Dry-seal pressure-type gasholders provided with stretch resistant seal structures and tensioned fender structures - Google Patents

Dry-seal pressure-type gasholders provided with stretch resistant seal structures and tensioned fender structures Download PDF

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Publication number
US3434815A
US3434815A US432582A US3434815DA US3434815A US 3434815 A US3434815 A US 3434815A US 432582 A US432582 A US 432582A US 3434815D A US3434815D A US 3434815DA US 3434815 A US3434815 A US 3434815A
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United States
Prior art keywords
seal
piston
side wall
back stop
plates
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Expired - Lifetime
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US432582A
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English (en)
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John H Wiggins
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17B—GAS-HOLDERS OF VARIABLE CAPACITY
    • F17B1/00—Gas-holders of variable capacity
    • F17B1/02—Details
    • F17B1/04—Sealing devices for sliding parts
    • F17B1/08—Sealing devices for sliding parts using resilient materials for packing, e.g. leather
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17B—GAS-HOLDERS OF VARIABLE CAPACITY
    • F17B1/00—Gas-holders of variable capacity
    • F17B1/02—Details
    • F17B1/04—Sealing devices for sliding parts

Definitions

  • This invention relates to d1y-seal, piston-type gasholders and other fluid storage apparatus, of the particular type or kind that comprise a container provided with a cylindrical side wall, a vertically movable piston in the container that forms the top wall of the gas storage space of the apparatus, a seal for the space between the piston and the container side wall made of gas-tight fabric and constructed in the form of a flexible curtain suspended between .and attached to the piston and to the container side wall and proportioned so as to provide for the rise and fall of the piston, and back up members or abutment surfaces disposed in such relationship with the curtain-like fabric seal that during the cycle of operations of the piston the abutment surfaces function as back stops that absorb pressure exerted on the seal by the gases confined in the storage chamber of the apparatus.
  • the portion of the container side wall located above the point where the fabric seal is attached to the wall is used to constitute an outer back stop that is located at the outer edge of the seal and which absorbs pressures exerted on the seal during the upward stroke of the piston, and at least one vertically movable inner back stop or abutment member of tubular or cylindrical form is arranged inside of the outer back stop in spaced, concentric relation with the same so as to absorb pressure exerted on the fabric seal during the downward stroke of the piston.
  • the inner back stop will be formed by a tubular or cylindrical member rigidly combined with the piston and projecting upwardly from the same, and if the fabric seal is composed of two cylindrical sections, one of which is attached to the container side wall and the other attached to the piston, an additional vertically movable back stop of tubular or cylindrical form will be arranged between the piston and the container side wall and attached to the two sections of the seal in such a way that during the cycle of operations of the piston the additional back stop will coact with the back stop on the piston to back up the inner seal section (the one nearest the piston), and the additional back stop will coact with the abutment surface on the container side wall to back up the outer section of the seal (the one nearest the container wall), as disclosed in US. Patent No. 2,606,824, dated Aug. 12, 1952, to John W. Allen.
  • One object of the invention therefore is to proportion the circumferential length of this seal and the effective cylindrical length of a scalloped back stop surface or inner back stop in such a way that there will always be some percentage of compression of the seal when it is pressed against the inner back stop after a long period of service.
  • Another object of the invention is to provide an improved sinuous surface to constitute the inner back stop which will prevent any wrinkling when the seal is against this surface.
  • a further object of the invention is to provide an inner back stop comprising specially constructed and mounted plates so that the loads on the (plates and the means for joining the plates will be resisted in the plates and the means as tension.
  • a further object of the invention is to mount these scalloped plates so that all the plates are identical and hence the plate tensions balance each other all around.
  • Still another object of the invention is to so design the steel plates of sinuous or corrugated structure and so that the attachments of the seal lplates to each other are in completely accessible locations and can be performed by one man.
  • a further object of the invention is to provide a piston structure which facilitates the assembly of the posts and the plates in accurate predetermined positions.
  • FIGURE 1 is a horizontal sectional view taken in the plane indicated by the line 11 in FIG. 3;
  • FIG. 2 is a fragmentary elevational view taken as generally indicated by the line 2-2 in FIG. 1;
  • FIG. 3 is a vertical sectional view taken as indicated by the line 3--3 in FIG. 2;
  • FIG. 4 is an enlarged portion of the section shown in FIG. 3;
  • FIG. 5 is a fragmentary perspective view illustrating the rolling of the seal in a loop as it moves from the inner back stop to the outer back stop or vice versa;
  • FIG. 6 is a fragmentary sectional view taken as indicated with the line 66 in FIG. 2;
  • FIG. 7 is an elevational view of the fragmentary sectional view shown in FIG. 6 as viewed from the right thereof.
  • the gasholder of the present invention includes a cylindrical side wall 11, a bottom 12 and a roof, not shown, to form a completely enclosed container for a dryseal piston-type gasholder.
  • a piston 13 having a solid bottom wall 14 around which a circular angle or girder 16 is mounted and above which a circular framework is provided including vertical posts 17 and an upper circular angle or girder 18.
  • the circular girder 18 has respective depending lugs 19 welded thereto which have a pair of apertures to receive fastening bolts (unnumbered) for the vertical posts 17 which at their bottoms are welded to brackets 20 extending upwardly from their welded connections to the bottom wall 14 of the piston 13.
  • This circular framework comprises the first part of the inner back stop.
  • a rubberized fabric seal 21 is provided and is secured about the periphery of the circular girder 16 by a series of clamp bars 2 2 bolted to the girder 16, and, at its upper end, the seal 21 is secured by a series of clamp bars 23 to the side wall 11 of the gasholder. At both points of the attachment of the seal 21 to the piston 13 and to the side wall 11, care is taken to make the connection gas-tight.
  • the seal 21 itself is a rubberized fabric of gastight character.
  • each plate 26 has its curved ridge 26a seated over one of the vertical posts 17 and then extends inwardly therefrom in concave fashion and the two edges of each plate 26 are provided with a right angle flange 27 which extends vertically and directed toward the center of the piston 13.
  • the flanges 27 of adjacent plates 26 are secured together by a plurality of bolts 28, the dimensioning of the plates and the spacing of the posts 17 being such that these plates 26 are in tension when bolted together and correspondingly, the bolts 28 are also in tension.
  • No gap is present where the edges of the plates 26 meet, and therefore the seal 21 lies smoothly as it crosses these edges.
  • a smooth continuous corrugated or sinuous surface is presented as an inner back stop for the seal 21 and this surface including the corrugations has an average diameter of the circle C-3 which is shown in phantom lines in FIG. 4.
  • This circle 0-?) may be substantially equal to or slightly less (as shown) than the circle C4 of the relaxed condition of the seal 21, i.e., when there is no gas present in the gasholder.
  • Rectangular washers 30 are provided for each of the bolts 28.
  • the circumferential length of the fabric seal 21 when relaxed is less than the circumferential length of the outer back stop or gasholder side wall 11, and is greater than the effective circumferential length of the sinuous support or second part of the inner back stop carried by the piston 13. Therefore when the seal 21 is pressed against the gasholder side wall 11 (C-1) it will be under tension and a certain amount of stretch will occur, and corresponding when the seal 21 is pressed against the inner back stop (C-2) it will be under a slight compression and a counteraction of the stretching will occur.
  • This combination of alternate compression and tension of the seal 21 as the cycles of the piston 13 continue prevents a permanent lengthening of the seal 21 and allows no wrinkling of the seal 21 as occurs if it were continually under tension and continually stretched.
  • the desirable optimum condition is to have the compression effect in the shortening of the seal 21 balance the tension effect in the lengthening of the seal 21 so that additional years of wrinkle-free operation are provided.
  • a gap G between the inner surface of the outer side wall 11 of the gasholder and the outer sufrace of the piston 13 and this gap is termed the operational gap in which the seal 21 must work as the piston 13 rises and falls within the gasholder.
  • a second radial distance Gc called the seal compression gap, which is the radial distance from the relaxed position of the seal 21 to the effective circumference of the scalloped back stop surface and, roughly, this compression gap Gc should be an amount which is essential for the allowable compression of the seal 21 during operation of the gasholder.
  • the circumference (C4) of the seal 21 is madeslightly greater than the effective circumference (C3) of the scalloped back stop.
  • Gt radial distance extending radially outward from the seal 21 to the inner wall 11 of the gasholder and this gap constitutes a seal tension gap, and G! is an amount which is essential for the desired stretch of the seal 21 during the operation of the gasholder to balance the compression of the seal 21.
  • the construction of the sinuous inner back stop provides several advantages. In the first place it presents the convex surfaces of the vertically disposed plates 26 inwardly in order that the loads of the seal 21 may be resisted as tension. Also the plates 26 are so joined that each plate 26 balance the tensions in the two adjacent plates 26, and therefore there is balanced tension in all the plates 26. This balanced tension transmits only radially directed forces to the supporting frame posts 17 around which the plates 26 are mounted.
  • the vertical seams of the plates 26 are completely accessible inside of the piston 13 and can be set in place by one man in an unobstructed area. Also in assembling these plates 26, they are temporarily supported by the bolts at the top of the posts 17 by the simple swingable attachment at each post 17 by means of a bolt 17a; and as the plates 26 are progressively joined at their vertical flanges 27 these flanges 27 are automatically pulled into vertical lines so that they fit controlled by the level line of the holes in the posts 17 for the bolts 17a. This removes the necessity for the posts 17 to be perfectly plumb. The only necessary accurate location for spacing of the posts 17 is at their top connections to the circular girder 18.
  • the construction of the sinuous part of the inner back stop is smooth and uninterrupted without any unsupported seal area, as found for example in a full length vertical solt into which the seal 21 might stretch out of control, and also, this smooth continuous surface induces the seal 21 to compress instead of wrinkling as every tiny area of the seal 21 is pressed against the back stop surface by the gas in the gasholders.
  • a gasholder comprising a substantially vertical cylindrical side wall, a vertically movable cylindrical piston therein spaced from said side wall, an annular flexible seal secured along one edge thereof in sealed relation to said side wall along a circular line intermediate the height thereof and secured along the other edge thereof in sealed relation to said piston along a circular line adjacent to the bottom thereof, and an annular fender structure mounted on said piston and extending upwardly therefrom and spaced from said side Wall, said fender structure including a series of vertical circumferentially spaced posts mounted in a circular array on said piston, and a series of plates each having at least one vertically disposed smooth ridge disposed adjacent to one of said posts and having arcuate concave sections disposed on each side thereof, and means joining the adjacent vertical edges of said plates to provide a continuous sinuous outer surface for said fender structure, said outer surface being smooth and continuous at the ridges disposed at said posts and being smoothly concave between said ridges and across the junctures between adjacent plates.
  • each of said plates has inwardly directed flanges on the vertical edges thereof, and said means securing said adjacent plates is a series of bolts holding said plates in tension.
  • a gasholder comprising a substantially vertical cylindrical side wall, a vertically movable cylindrical piston therein spaced from said side wall, an annular flexible seal secured along one edge thereof in sealed relation to said side wall along a circular line intermediate the height thereof and secured along the other edge thereof in sealed relation to said piston along a circular line adjacent to the bottom thereof, and an annular fender structure mounted on said piston and extending upwardly therefrom and spaced from said side wall, said fender structure including a series of vertical circumferentially spaced posts mounted on a circular array on said piston, a series of plates each having at least one vertically dis posed smooth ridge disposed adjacent to one of said posts and having arcuate concave sections disposed on each side thereof, means joining the adjacent vertical edges of said plates to provide a continuous sinuous outer surface for said fender structure, said outer surface being smooth and continuous at the ridges disposed at said posts and being smoothly concave between said ridges and across the junctures between adjacent plates, the effective diameter of the outer surface of said fender
  • a gasholder comprising a substantially vertical cylindrical side wall, a vertically movable cylindrical piston therein spaced from said side wall, an annular flexible seal secured adjacent to one edge thereof in sealed relation to said side wall along a circular line intermediate the height thereof and secured adjacent to the other edge thereof in sealed relation to said piston along a circular line, and an annular fender structure mounted on said piston and extending upwardly therefrom and spaced from said side wall, the outermost portions of said piston and said fender structure lying within a cylindrical surface spaced from said side wall a predeterined distance to provide an operational gap therebetween, said fender structure including an outer sinuous surface having an effective diameter less than the inner diameter of said side wall but greater than said cylindrical surface while maintaining said operational gap, said annular flexible seal having a normal and unstretched diameter intermediate that of the inner surface of said side wall and said cylindrical surface, whereby the pressure of the gas in said gasholder urges said seal against the inner surface of said side wall to place said seal in tension when said piston is in the upper portion of the travel thereof,
  • said fender structure includes a series of vertical circumferentially spaced posts mounted in a circular array on said piston, and a series of plates mounted on said posts and providing vertically extending concave surfaces between said posts.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
US432582A 1965-02-15 1965-02-15 Dry-seal pressure-type gasholders provided with stretch resistant seal structures and tensioned fender structures Expired - Lifetime US3434815A (en)

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US43258265A 1965-02-15 1965-02-15

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US3434815A true US3434815A (en) 1969-03-25

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US (1) US3434815A (zh)
AT (1) AT262488B (zh)
BE (1) BE676508A (zh)
DE (1) DE1529117A1 (zh)
DK (1) DK129367B (zh)
ES (1) ES323038A1 (zh)
GB (1) GB1085505A (zh)
LU (1) LU50462A1 (zh)
NL (1) NL6601825A (zh)
SE (1) SE313168B (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11548725B2 (en) 2013-03-15 2023-01-10 Industrial & Environmental Concepts, Inc. Cover systems, tank covering methods, and pipe retention systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104864260B (zh) * 2015-06-05 2016-09-07 中冶华天工程技术有限公司 一段式高压橡胶膜密封型气柜密封装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2669010A (en) * 1945-09-10 1954-02-16 Koppers Co Inc Method of making cylindrical surfaces
US2723908A (en) * 1952-03-15 1955-11-15 Wiggins Dry seal pressure type gas holder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2669010A (en) * 1945-09-10 1954-02-16 Koppers Co Inc Method of making cylindrical surfaces
US2723908A (en) * 1952-03-15 1955-11-15 Wiggins Dry seal pressure type gas holder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11548725B2 (en) 2013-03-15 2023-01-10 Industrial & Environmental Concepts, Inc. Cover systems, tank covering methods, and pipe retention systems

Also Published As

Publication number Publication date
LU50462A1 (zh) 1966-08-16
NL6601825A (zh) 1966-08-16
GB1085505A (en) 1967-10-04
BE676508A (zh) 1966-08-16
SE313168B (zh) 1969-08-04
DK129367B (da) 1974-09-30
AT262488B (de) 1968-06-10
DK129367C (zh) 1975-04-21
DE1529117A1 (de) 1969-06-26
ES323038A1 (es) 1967-01-01

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