CA1141687A - Split tank reinforcing means - Google Patents
Split tank reinforcing meansInfo
- Publication number
- CA1141687A CA1141687A CA000364356A CA364356A CA1141687A CA 1141687 A CA1141687 A CA 1141687A CA 000364356 A CA000364356 A CA 000364356A CA 364356 A CA364356 A CA 364356A CA 1141687 A CA1141687 A CA 1141687A
- Authority
- CA
- Canada
- Prior art keywords
- band
- sections
- ring
- tank
- clamping
- 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.)
- Expired
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
- B65D90/02—Wall construction
- B65D90/08—Interconnections of wall parts; Sealing means therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
There is disclosed a tank closure assembly adapted to releasably couple tank sections formed by transversely splitting a bag-molded, reinforced tank. There is also disclosed a method for forming the tank. The assembly in-cludes external circumferential clamping flanges which are provided by level winding a relatively narrow band of resin-impregnated filaments on the sidewall of the pressure vessel adjacent the midsection of the vessel. The resin in the filaments is cured and the band and vessel are cut in a plane perpendicular to the longitudinal axis of the vessel so that band halves are provided adjacent each open mouth of the tank sections and those band halves constitute the afore-mentioned clamping flanges. A circumferential, outwardly facing shelf is machined in a one-band half and an O-ring groove is machined in that outwardly facing shelf. A circumferential, inwardly facing shelf is machined in the other band half and an O-ring is provided in the O-ring groove. The band halves are telescoped together to form a pressure vessel with the O-ring pressed between the shelves. The band halves are clamped together to form the assembly.
There is disclosed a tank closure assembly adapted to releasably couple tank sections formed by transversely splitting a bag-molded, reinforced tank. There is also disclosed a method for forming the tank. The assembly in-cludes external circumferential clamping flanges which are provided by level winding a relatively narrow band of resin-impregnated filaments on the sidewall of the pressure vessel adjacent the midsection of the vessel. The resin in the filaments is cured and the band and vessel are cut in a plane perpendicular to the longitudinal axis of the vessel so that band halves are provided adjacent each open mouth of the tank sections and those band halves constitute the afore-mentioned clamping flanges. A circumferential, outwardly facing shelf is machined in a one-band half and an O-ring groove is machined in that outwardly facing shelf. A circumferential, inwardly facing shelf is machined in the other band half and an O-ring is provided in the O-ring groove. The band halves are telescoped together to form a pressure vessel with the O-ring pressed between the shelves. The band halves are clamped together to form the assembly.
Description
`\
This invention relates to pressure vessels and their manufacture and, more particularly, relates to a split tank closure assembly.
B`ag-molded glass fiber reinforced tanks or pressure vessels are dis-closed, for example, in United States Reissue Patent No. 25,241 to Randolph and United ~tates Patent No. 3,138,507 to Wiltshire. Split tank assemblies of the general class to which the present invention is directed are shown in United States Patents 2,709,524 to RusseLl et al and 3,388,823 to Fleming et al.
Split tanks of the type herein disclosed provide full access to the interior of the tank for placement and removal of rigid filter elements and various other purposes.
In United States Patent No~ 4133,442, granted January 9, 1979, there is disclosed a fiber-reinforced split tank assembly. Two basic arrangements are set forth in that patent for clamping the tank sections together. In one such arrangement~ grooves are cut into the tank sections to accommodate clamping members. However, in order to minimize weakening of the tank sections, the interior of the tank must be provided with additional reinforcement in the area where the grooves are cut. This necessitates extra resin and glass and adds further steps to the manufacturing operation. In another embodiment, there is disclosed an arrangement where plastic members are adhered to the tank sections to provide clamping flanges. The plastic clamping flanges are expensive and fit only a given size tank. Therefore, if a manufacturer makes tanks of different diameters, the manufacturers must provide plastic flanges to accommo-date various diameters.
According to one aspect of the present invention there is provided a fiber-reinforced plastic split tank assembly comprising a pair of tank sections having mating faces, each of said sections being provided with an external circumferential flange adjacent its mating face, each said flange comprising bands of filament-wound, resin-impregnated fibers encircling circumferential --I _ , . . ,~
,. ~
portions of said tank sections, said circumferential portions having an abraded surface, sealing means between said flanges, and clamping means clamping said flanges together.
According to another aspect of the invention there is provided a fiber-reinforced plastic split tank assembly comprising a pair of tank sections, each with an open mouth, the open mouth of a first one of said sections having a multiplicity of resin-impregnated wound fibers encircling an abraded portion of said first one of said sections adjacent said open mouth which comprises a first clamping flange, said first clamping flange having an outwardly facing recess extending circumferentially around the flange, a circumferentially extending groove in said recess, an O-ring in said groove, the open mouth of a second one of said sections having a multiplicity of resin-impregnated wound fibers encircling an abraded portion of said second one of said sections adjacent said open mouth which comprises a second clamping flange, said second clamping flange having an inwardly facing recess extending circumfer-entially around the flange, the inner diameter of the inwardly facing recess being slightly greater than the outer diameter of the outwardly facing recess so that the first clamping flange may be telescoped into the second clamping flange with the O-ring forming a seal between the flanges and means to clamp said flanges together.
According to a further aspect of the invention there is provided a method for forming a fiber-reinforced plastic split tank assembly comprising the steps of providing a hollow fiber-reinforced plastic pressure vessel, rotating said pressure vessel about its longitudinal axis, level winding resin-impregnated filaments on the sidewall of the vessel while confining the filaments to a relatively narrow band, curing the resin and the filaments, cutting the band and vessel in two at a plane perpendicular to such axis and '7 passing through the approximate midpoint of said band so that a band half is provided adjacent each open mouth~ machining a circumferential outwardly facing shelf in one band half~
- -2a-.
. . .
machining an 0-ring groove in said outwardly facing shelf, machining a circum-ferential inwardly facing shelf in the other band half, providing an 0-ring in said groove, telescoping the band halves together to form a pressure vessel withthe 0-ring pressed between said shelves, and clamping said half-bands together to form said assembly.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIGURE 1 is an elevational view of a completed assembly;
FIGURE 2 is a fragmentary, cross sectional view of the tank after the filament winding operationJ illustrating a technique for confining the resin-impregnated filaments to a predetermined location on the sidewall of the tank;
FIGURE 3 is a fragmentary, cross sectional view similar to FIGURE 2, but showing the tank after a severing operation;
FIGURE 4 is a fragmentary, cross sectional view of the complete joint assembly; and FIGURE 5 is a perspective view of one of the clamps employed in the invention.
Referring initially to FIGURE 1, there is illustrated a split tank assembly 10 constructed in accordance with the principles of the invention. The assembly 10 includes a pair of mating tank sections 11 and 12 formed by trans-versely splitting an elongated tank having generally cylindrical sidewalls and domed end walls. Preferably, the tank is originally an integral, bag-molded, glass-reinforced, closed tank such as that shown in the aforementioned United States Reissue Patent No. 25,241. Each tank section 11 and 12 is provided with a clamping band 13 and 14 so that C-clamps may be applied to hold the assembly together during use. The clamping bands 13 and 14 are initially fabricated as a single unit or band 15 by a conventional filament winding technique. In such a typical technique, the tank would be mounted in a hori~ontal position for rota~
tion about its longitudinal axis in a filament winding machine which is similar to a lathe. To provide a stronger bond between the filaments and tank sidewall, the sidewall is slightly abraded in the area to be wound. Resin-impregnated fiber filaments are then laid up on the sidewall by a guide which moves back andforth at a predetermined rate which is geared to the rate of rotation of the vessel between end guides 16 and 17. The rate of traverse is such that the filaments are laid down in a level-wound pattern where there is substantially noside-to-side overlap of the filaments. When the band 15 is built up to a suit-able thickness, the resin is cured (by heat, a suitable catalyst, or both) and the guides 16 are removed.
Referring now to FIGURP 3, the tank sections 11 and 12 are formed by rotating the unitary tank about its longitudinal axis while severing the band 15and the tank with a suitable tungscen carbide or diamond cutting tool.
To complete the assembly, the clamping bands 13 and 14 are further machined in the following manner. The clamping band 13 is machined along the dotted line 17 to provide a shelf 18 and a circumferential 0-ring groove 19.
This operation may be done with a single cutting tool shaped to conform to the shape of the shelf 18 and the 0-ring groove 19.
A portion 20, together with a portion 21 of the band 14, is machined away to form an inwardly facing shelf 22 which has a diameter slightly greater than the diameter of the shelf 18.
After the machining operations are completed, an 0-ring 28 is inserted in the 0-ring groove 19 and, as is indicated in FIGURE 4, the tank sections are brought together by telescoping the shelf 18 into the shelf 22 so that the 0-ring 28 is firmly pressed between the band halves. The ends of the band halves are undercut slightly to provide a gripping surface for the clamps.
As indicated in FIGURES 4 and 5, clamps 23 are provided. Each clamp 23 has a C-shaped configuration and is provided with raised stiffening portions 24 at the legs of the C. The clamps 23 are held in place by a band 25 which ex-tends through struck-out tab portions 26 on each clamp. The band is fastened together by a nut and bolt 27 or other suitable fastener~ As may be appreci-ated, the bands may be employed on tanks of various diameters, as opposed to prior art techniques wherein integral bands were employed as the clamping means.
As is evident in FIGURE 4, the legs of the clamps are slightly in-clined toward each other so that they conform to the undercut portions of the bands. To assemble the tank sections, the tank sections must be abutted to per-mit the legs to clear the band ends. When the tank is pressurized, the sections part slightly, as is indicated in FIGURE 4, so that the clamps cannot be re-moved while the tank is under pressure.
_5 _
This invention relates to pressure vessels and their manufacture and, more particularly, relates to a split tank closure assembly.
B`ag-molded glass fiber reinforced tanks or pressure vessels are dis-closed, for example, in United States Reissue Patent No. 25,241 to Randolph and United ~tates Patent No. 3,138,507 to Wiltshire. Split tank assemblies of the general class to which the present invention is directed are shown in United States Patents 2,709,524 to RusseLl et al and 3,388,823 to Fleming et al.
Split tanks of the type herein disclosed provide full access to the interior of the tank for placement and removal of rigid filter elements and various other purposes.
In United States Patent No~ 4133,442, granted January 9, 1979, there is disclosed a fiber-reinforced split tank assembly. Two basic arrangements are set forth in that patent for clamping the tank sections together. In one such arrangement~ grooves are cut into the tank sections to accommodate clamping members. However, in order to minimize weakening of the tank sections, the interior of the tank must be provided with additional reinforcement in the area where the grooves are cut. This necessitates extra resin and glass and adds further steps to the manufacturing operation. In another embodiment, there is disclosed an arrangement where plastic members are adhered to the tank sections to provide clamping flanges. The plastic clamping flanges are expensive and fit only a given size tank. Therefore, if a manufacturer makes tanks of different diameters, the manufacturers must provide plastic flanges to accommo-date various diameters.
According to one aspect of the present invention there is provided a fiber-reinforced plastic split tank assembly comprising a pair of tank sections having mating faces, each of said sections being provided with an external circumferential flange adjacent its mating face, each said flange comprising bands of filament-wound, resin-impregnated fibers encircling circumferential --I _ , . . ,~
,. ~
portions of said tank sections, said circumferential portions having an abraded surface, sealing means between said flanges, and clamping means clamping said flanges together.
According to another aspect of the invention there is provided a fiber-reinforced plastic split tank assembly comprising a pair of tank sections, each with an open mouth, the open mouth of a first one of said sections having a multiplicity of resin-impregnated wound fibers encircling an abraded portion of said first one of said sections adjacent said open mouth which comprises a first clamping flange, said first clamping flange having an outwardly facing recess extending circumferentially around the flange, a circumferentially extending groove in said recess, an O-ring in said groove, the open mouth of a second one of said sections having a multiplicity of resin-impregnated wound fibers encircling an abraded portion of said second one of said sections adjacent said open mouth which comprises a second clamping flange, said second clamping flange having an inwardly facing recess extending circumfer-entially around the flange, the inner diameter of the inwardly facing recess being slightly greater than the outer diameter of the outwardly facing recess so that the first clamping flange may be telescoped into the second clamping flange with the O-ring forming a seal between the flanges and means to clamp said flanges together.
According to a further aspect of the invention there is provided a method for forming a fiber-reinforced plastic split tank assembly comprising the steps of providing a hollow fiber-reinforced plastic pressure vessel, rotating said pressure vessel about its longitudinal axis, level winding resin-impregnated filaments on the sidewall of the vessel while confining the filaments to a relatively narrow band, curing the resin and the filaments, cutting the band and vessel in two at a plane perpendicular to such axis and '7 passing through the approximate midpoint of said band so that a band half is provided adjacent each open mouth~ machining a circumferential outwardly facing shelf in one band half~
- -2a-.
. . .
machining an 0-ring groove in said outwardly facing shelf, machining a circum-ferential inwardly facing shelf in the other band half, providing an 0-ring in said groove, telescoping the band halves together to form a pressure vessel withthe 0-ring pressed between said shelves, and clamping said half-bands together to form said assembly.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIGURE 1 is an elevational view of a completed assembly;
FIGURE 2 is a fragmentary, cross sectional view of the tank after the filament winding operationJ illustrating a technique for confining the resin-impregnated filaments to a predetermined location on the sidewall of the tank;
FIGURE 3 is a fragmentary, cross sectional view similar to FIGURE 2, but showing the tank after a severing operation;
FIGURE 4 is a fragmentary, cross sectional view of the complete joint assembly; and FIGURE 5 is a perspective view of one of the clamps employed in the invention.
Referring initially to FIGURE 1, there is illustrated a split tank assembly 10 constructed in accordance with the principles of the invention. The assembly 10 includes a pair of mating tank sections 11 and 12 formed by trans-versely splitting an elongated tank having generally cylindrical sidewalls and domed end walls. Preferably, the tank is originally an integral, bag-molded, glass-reinforced, closed tank such as that shown in the aforementioned United States Reissue Patent No. 25,241. Each tank section 11 and 12 is provided with a clamping band 13 and 14 so that C-clamps may be applied to hold the assembly together during use. The clamping bands 13 and 14 are initially fabricated as a single unit or band 15 by a conventional filament winding technique. In such a typical technique, the tank would be mounted in a hori~ontal position for rota~
tion about its longitudinal axis in a filament winding machine which is similar to a lathe. To provide a stronger bond between the filaments and tank sidewall, the sidewall is slightly abraded in the area to be wound. Resin-impregnated fiber filaments are then laid up on the sidewall by a guide which moves back andforth at a predetermined rate which is geared to the rate of rotation of the vessel between end guides 16 and 17. The rate of traverse is such that the filaments are laid down in a level-wound pattern where there is substantially noside-to-side overlap of the filaments. When the band 15 is built up to a suit-able thickness, the resin is cured (by heat, a suitable catalyst, or both) and the guides 16 are removed.
Referring now to FIGURP 3, the tank sections 11 and 12 are formed by rotating the unitary tank about its longitudinal axis while severing the band 15and the tank with a suitable tungscen carbide or diamond cutting tool.
To complete the assembly, the clamping bands 13 and 14 are further machined in the following manner. The clamping band 13 is machined along the dotted line 17 to provide a shelf 18 and a circumferential 0-ring groove 19.
This operation may be done with a single cutting tool shaped to conform to the shape of the shelf 18 and the 0-ring groove 19.
A portion 20, together with a portion 21 of the band 14, is machined away to form an inwardly facing shelf 22 which has a diameter slightly greater than the diameter of the shelf 18.
After the machining operations are completed, an 0-ring 28 is inserted in the 0-ring groove 19 and, as is indicated in FIGURE 4, the tank sections are brought together by telescoping the shelf 18 into the shelf 22 so that the 0-ring 28 is firmly pressed between the band halves. The ends of the band halves are undercut slightly to provide a gripping surface for the clamps.
As indicated in FIGURES 4 and 5, clamps 23 are provided. Each clamp 23 has a C-shaped configuration and is provided with raised stiffening portions 24 at the legs of the C. The clamps 23 are held in place by a band 25 which ex-tends through struck-out tab portions 26 on each clamp. The band is fastened together by a nut and bolt 27 or other suitable fastener~ As may be appreci-ated, the bands may be employed on tanks of various diameters, as opposed to prior art techniques wherein integral bands were employed as the clamping means.
As is evident in FIGURE 4, the legs of the clamps are slightly in-clined toward each other so that they conform to the undercut portions of the bands. To assemble the tank sections, the tank sections must be abutted to per-mit the legs to clear the band ends. When the tank is pressurized, the sections part slightly, as is indicated in FIGURE 4, so that the clamps cannot be re-moved while the tank is under pressure.
_5 _
Claims (6)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A fiber-reinforced plastic split tank assembly comprising a pair of tank sections having mating faces, each of said sections being provided with an external circumferential flange adjacent its mating face, each said flange comprising bands of filament-wound, resin-impregnated fibers encircling circumferential portions of said tank sections, said circumferential portions having an abraded surface, sealing means between said flanges, and clamping means clamping said flanges together.
2. A fiber-reinforced plastic split tank assembly according to claim 1, wherein said sealing means is an O-ring.
3. A fiber-reinforced plastic split tank assembly according to claim 1, wherein said clamping means comprises a plurality of C-shaped members main-tained in a spaced array by a band which encircles said flanges.
4. A fiber-reinforced plastic split tank assembly according to claim 2, wherein said O-ring is provided in a circumferential groove on one of said flanges.
5. A fiber-reinforced plastic split tank assembly comprising a pair of tank sections, each with an open mouth, the open mouth of a first one of said sections having a multiplicity of resin-impregnated wound fibers encircling an abraded portion of said first one of said sections adjacent said open mouth which comprises a first clamping flange, said first clamping flange having an outwardly facing recess extending circumferentially around the flange, a circumferentially extending groove in said recess, an O-ring in said groove, the open mouth of a second one of said sections having a multiplicity of resin-impregnated wound fibers encircling an abraded portion of said second one of said sections adjacent said open mouth which comprises a second clamping flange, said second clamping flange having an inwardly -facing recess extend-ing circumferentially around the flange, the inner diameter of the inwardly facing recess being slightly greater than the outer diameter of the outwardly facing recess so that the first clamping flange may be telescoped into the second clamping flange with the O-ring forming a seal between the flanges and means to clamp said flanges together.
6. A method for forming a fiber-reinforced plastic split tank assembly comprising the steps of providing a hollow fiber-reinforced plastic pressure vessel, rotating said pressure vessel about its longitudinal axis, level winding resin-impregnated filaments on the sidewall of the vessel while con-fining the filaments to a relatively narrow band, curing the resin and the filaments, cutting the band and vessel in two at a plane perpendicular to such axis and passing through the approximate midpoint of said band so that a band half is provided adjacent each open mouth, machining a circumferential outwardly facing shelf in one band half, machining an O-ring groove in said outwardly facing shelf, machining a circumferential inwardly facing shelf in the other band half, providing an O-ring in said groove, telescoping the band halves together to form a pressure vessel with the O-ring pressed between said shelves, and clamping said half-bands together to form said assembly.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11335180A | 1980-01-18 | 1980-01-18 | |
| US113,351 | 1980-01-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1141687A true CA1141687A (en) | 1983-02-22 |
Family
ID=22348937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000364356A Expired CA1141687A (en) | 1980-01-18 | 1980-11-10 | Split tank reinforcing means |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0033598A3 (en) |
| JP (1) | JPS56147964A (en) |
| AU (1) | AU6623681A (en) |
| BR (1) | BR8100261A (en) |
| CA (1) | CA1141687A (en) |
| DK (1) | DK18581A (en) |
| ES (1) | ES267096Y (en) |
| NO (1) | NO810141L (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58123906U (en) * | 1982-02-16 | 1983-08-23 | 内田鍜工株式会社 | band for utility pole |
| JPS58127208U (en) * | 1982-02-23 | 1983-08-29 | 内田鍛工株式会社 | band for utility pole |
| SE528634C2 (en) * | 2004-09-09 | 2007-01-09 | Olcon Engineering Ab | Gas-tight transport container for detonating dangerous goods |
| JP5419156B2 (en) * | 2009-11-26 | 2014-02-19 | 国立大学法人九州大学 | Liner for production test of composite container and production test method |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE25241E (en) * | 1962-09-11 | Method of making impregnated glass fiber articles | ||
| US288638A (en) * | 1883-11-20 | Tool for facing emery-wheels | ||
| US3138507A (en) * | 1961-06-15 | 1964-06-23 | Structural Fibers | Fiber reinforced plastic articles and method of making the same |
| US3388823A (en) * | 1967-01-11 | 1968-06-18 | Fleming T J Co | Double chamber compressed fluid reservoir |
| US3655085A (en) * | 1968-04-12 | 1972-04-11 | Arde Inc | Filament wound spherical pressure vessel |
| US3700512A (en) * | 1969-09-05 | 1972-10-24 | Owens Corning Fiberglass Corp | Method of forming a fluid retaining wall |
| US3843429A (en) * | 1970-09-18 | 1974-10-22 | Stebbins Eng And Mfg Co | Glass fiber reinforced resin tank structures and method of fabricating |
| US4005233A (en) * | 1975-10-30 | 1977-01-25 | The United States Of America As Represented By The United States Energy Research And Development Administration | Filament wound structure and method |
| US4133442A (en) * | 1976-12-27 | 1979-01-09 | Structural Fibers, Inc. | Tank closure assembly |
-
1980
- 1980-11-10 CA CA000364356A patent/CA1141687A/en not_active Expired
-
1981
- 1981-01-15 EP EP81300174A patent/EP0033598A3/en not_active Withdrawn
- 1981-01-15 AU AU66236/81A patent/AU6623681A/en not_active Abandoned
- 1981-01-16 ES ES1981267096U patent/ES267096Y/en not_active Expired
- 1981-01-16 DK DK18581A patent/DK18581A/en not_active Application Discontinuation
- 1981-01-16 NO NO810141A patent/NO810141L/en unknown
- 1981-01-16 BR BR8100261A patent/BR8100261A/en unknown
- 1981-01-19 JP JP625481A patent/JPS56147964A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| AU6623681A (en) | 1981-07-23 |
| NO810141L (en) | 1981-07-20 |
| EP0033598A2 (en) | 1981-08-12 |
| ES267096U (en) | 1984-10-01 |
| EP0033598A3 (en) | 1981-08-26 |
| DK18581A (en) | 1981-07-19 |
| ES267096Y (en) | 1985-04-01 |
| BR8100261A (en) | 1981-08-04 |
| JPS56147964A (en) | 1981-11-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |