CA1073316A - Fluid pressure rupturable apparatus - Google Patents
Fluid pressure rupturable apparatusInfo
- Publication number
- CA1073316A CA1073316A CA273,268A CA273268A CA1073316A CA 1073316 A CA1073316 A CA 1073316A CA 273268 A CA273268 A CA 273268A CA 1073316 A CA1073316 A CA 1073316A
- Authority
- CA
- Canada
- Prior art keywords
- recess
- rupturable
- rupturable portion
- fluid pressure
- opposite ends
- 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
Abstract
INTEGRAL FLUID PRESSURE RUPTUABLE APPARATUS
Abstract of the Disclosure An integral reverse buckling fluid pressure rupturable apparatus comprised of a support body formed of a ductile material having opposite ends and having a recess extending inwardly from one of the opposite ends, the internal terminus of the re-cess being positioned in close proximity to the other of the opposite ends of the body or to the terminus of another recess extending inwardly from the other of the opposite ends, whereby a relatively thin integral rupturable portion is formed in the body. The rupturable portion is of a concave-convex shape formed by applying pressure on a side of the rupturable portion when in a substantially flat state.
Abstract of the Disclosure An integral reverse buckling fluid pressure rupturable apparatus comprised of a support body formed of a ductile material having opposite ends and having a recess extending inwardly from one of the opposite ends, the internal terminus of the re-cess being positioned in close proximity to the other of the opposite ends of the body or to the terminus of another recess extending inwardly from the other of the opposite ends, whereby a relatively thin integral rupturable portion is formed in the body. The rupturable portion is of a concave-convex shape formed by applying pressure on a side of the rupturable portion when in a substantially flat state.
Description
~733~l6 Back round of the Invention ~ g 1 Field of the Invention -This invention relates to an integral fluid pressure rupturable apparatus, and more particularly, to an integral reverse buckling safety pressure relief apparatus.
2. Description of the Prior Art Many various safety pressure relief devices of the rup-ture disk type have been developed. Generally, these devices include a rupture disk supported between a pair of supporting members or flanges which are in turn connected to a relief connection in a vessel or system containing fluid pressure.
When the fluid pressure within the vessel or system exceeds the design rupture pressure of the disk, rupture occurs causing fluid pressure to be relieved from the vessel or system.
Generally, such heretofore developed and used rupture disk assemblies have been welded, soldered, bolted or otherwise clamped together, and the rupture disks have generally been formed of a thin frangible metal or other material having a ; concave-convex shape.
For many years after the initial development of safety pressure relief devices of the rupture disk type, and often presently, the concave-convex rupture disk is placed in the pressure relief assembly so that fluid pressure from the ves-sel or system to be protected is exerted against the concave side of the disk. This arrangement places the disk in tension ; and in order to prevent premature stress failures in -the disk, the operating fluid pressure exerted on the disk, i.e., the normal operation pressure of the vessel or system/ must be considerably less than the pressure at which the disk is designed to rupture.
:1(31733~6 In more recent years, rupture disk assemblies of the so-called "reverse buckling" type have been developed which are capable of operating at 90 percent or more of the pressure at which the disk is designed to rupture. Such assemblies in-clude various parts which are welded, soldered, bolted orotherwise clamped together and include a concave-convex rupture ~;
disk positioned in the assembly so that fluid pressure from the system or vessel to be protected is exerted on the convex side of the disk. This results in the disk being placed in compression during operation and allows the normal fluid pres-sure exerted on the disk to be relatively close to the pressure at which the disk is designed to rupture. Further, reverse buckling rupture disks can withstand pressure fluctuations within the vessel or system over a long period of time without premature failure. Such reverse buckling rupture disk assemblies have heretofore included knife blades upon which the disk im-pales when reversed by excess fluid pressure, or scores or grooves on a surface of the concave-convex portion of the disk creatiny lines of weakness therein so that upon reversal, the concave-convex portion tears along the lines of weakness and opens.
In substantially all of the various safety pressure relief devices developed and used heretofore, various parts are as-sembled and clamped together. In reverse buckling rupture disk assemblies, the rupture disk is often clamped between a pair of special annular members which are in turn clamped between inlet and outlet flanges. Regardless of the particular techniques used for clamping the rupture disk between supporting members, the pressure at which the disk ruptures is often affected and can be changed appreciably by variables in the holdlng or ~7~3~6 clamping means. For example, the rupture pressures of reverse buckling rupture disk assemblies which are welded or soldered together are affected by variations in the welding or soldering heat, the speed at which the welding or soldering is accom-plished, the ~orce exerted on the rupture disk by the supportingmembers, etc. The rupture pressure of reverse buckling rupture disks clamped in bolted assemblies are affected and often substantially changed by variations in the flange confi~uration, the bolting load exerted on the rupture disk, misalignment of the rupture disk within the supporting members, etc. Further, because heretofore used reverse buckling rupture disk assem-blies include various parts which are clamped together, the utilization of such devices in high pressure applications has been limited, i~e., to applications wherein the fluid pressure exerted on the rupture disk are below about 2,000 psig. This limitation hasgenerally been due to the fact that a reverse buckling rupture disk designed for a high pressure application must include a relatively thick concave-convex portion con-nected to an annular flange portion by a transition connection having a large radius. When high pressures are exerted on the disk, unpredictable failure often occurs at the large radius transition connection in that the diameter of the concave-convex portion is reduced as the pressure forces exerted thereon cause the radius portion to roll inward until the disk fails by rolling off the supporting member.
By the present invention, an integral reverse buckling fluid pressure rupturable apparatus is provided which includes only a single part thereby eliminating the problems mentioned above. Further, the apparatus of the present invention is particularly suitable in high pressure applications in that the ~L~733~L6 ~
rupturable portion of the apparatus does not include a large radius transition connection and consequently the heretofore experienced problems of unpredictable failure are obviated.
Summary of the Invention An integral reverse buckling fluid pressure rupturable apparatus comprised of a body formed of a ductile material having opposite ends, having a recess extending inwardly from one of the opposite ends, the internal terminus of the recess being positioned in close proximity to the other of the oppo- -site ends of the body whereby a relatively thin integral rup-turable portion is formed in the body. The rupturable portion of the body is of a concave-convex shape formed by applying pressure on a side of the rupturable portion when in a substan-tially flat state.
It is, therefore, a general object of the present invention to provide an integral pressure formed reverse buckling fluid ;
pressure rupturable apparatus of one-piece integral construc~
tion whereby the requirement of clamping several parts together to form the apparatus is eliminated.
Yet a further object of the present invention is the pro-vision of an integral reverse buckling fluid pressure ruptur-able apparatus which is capable of achieving long service life in extremely high pressure applications at operating pressures up to 90 percent of the pressure at which the apparatus is designed to rupture.
Another object of the present invention is the provision of an integral reverse buckling fluid pressure rupturable apparatus which is economical to produce in lots or groups with little variation in the rupture pressure between indivi-dual apparatus in the group.
~733~6 Other and fuxthex objects, ~eatures and advantages of the present invention will be readily apparent to those skilled in the art upon a reading of the description of preferred embo-diments which follows when taken in conjunction with the accompanying drawings. ;~
Brief Description of the Drawings FIGURE 1 is a perspective view of one form of an integral reverse buckling fluid pressure rupturable apparatus of the present invention.
FIGURE 2 is a cross-sectional view of the apparatus of FIGURE l.
FIGURE 3 is a cross-sectional view similar ko FIGURE 2 showing the apparatus after revesal of the rupturable portion thereof.
; 15 FIGURE 4 is a cross-sectional view similar to FIGURE 2 showing the apparatus after reversal and rupture of the rupturable portion thereof.
FIGURE 5 is an enlarged partial cross-sectional view of the apparatus of FIGURE l prior to forming the rupturable portion thereof into a concave-convex shape.
FIGURE 6 is an enlarged partial cross-sectional view of the apparatus of FIGURE l after forming the rupturable portion thereof into a concave-convex shape.
FIGURE 7 is a perspective view of an alternate form of the apparatus of the present invention.
: FIGURE 8 is a cross-sectional view of the apparatus of FIGURE 7.
FIGURE 9 is a cross-sectional view of apparatus similar to that illustrated in FIGURES 1 and 2, showing a:Lternate arrangements of the rupturable portion thereof.
~L0733~1L6 FIGURE 10 is a cross-sectional view similar to FIGURE 9 showing another alternate arrangement.
FIGURE 11 is a cross-sectional view similar to FIGURE 10 showing yet another alternate arrangement.
Description of Preferred Embodiments Referring now to the drawings, and particularly to FIGURES
1 through 4, one presently preferred form of the apparatus of the present invention is illustrated and generally designated by the numeral 10. The apparatus 10 basically comprises a cylindrical support body 12 formed of a ductile material having opposite parallel ends 14 and 16. As best shown in FIGURES 2-4, an inlet cylindrical recess 18 i.s provided in the body 12 ex-tending from the end 14 thereof inwardly and terminating within the body 12. An outlet cylindrical recess 20 is provided in the support body 12 extending inwardly from the end 16 thereof and terminating in close proximity to the terminus of the recess 18 whereby a relatively thin integral rupturable portion 22 is formed into a concave-convex shape with the convex side 2~ thereof ~acing the inlet recess 1~ and the concave side 26 thereof facing the outlet recess 20. The cylindrical body 12 and the cylindrical inlet and outlet : recesses 18 and 20 therein are positioned coaxially so that the rupturable portion 22 of the body 12 is connected to the remaining outer annular portion 28 of the body 12 by an annular connection 30 lying in a plane perpendicular to the axis of the body 12.
The rupturable portion 22 of the body 12 is formed into its concave-convex shape by first machining the rupturable portion 22 in a flat configuration as shown in FIGURE 5. Pres-sure is then applied to the rupturable portion 22 by way of 11D733~6 the outlet recess 20 so that the rupturable portion 22 is stretched or bulged into the desired concave-convex shape.
While the stretching or bulging of the rupturable portion 22 can be accomplished mechanically, i.e., forcing a plug having a convex surface against the rupturable portion 22 by way of the outlet recess 20 until the rupturable portion 22 is de-formed into a concave-convex shape corresponding with the convex shape of the plu~, the bulging of the rupturable portion 22 is preferably accomplished by exerting fluid pressure on the side 26 thereof by way of the outlet recess 20. In either technique, in order to insure that the connection 30 of the rupturable portion 22 to the outer annular portion 28 of the body 12 is of proper strength, i.e., resists tearing or cracking when the rupturable portion 22 is formed into the concave-convex shape, the recesses 18 and 20 are machined or otherwise formed in the body 12 whereby the connection 30 includes smoothly curved portions on both sides of the ruptur-able portion 22 and the rupturable portion 22 is substantially flat. The curved portion o the connection 30 on the side 26 of the rupturable portion 22 corresponds with an arc of a circle having a radius R. The curved portion of the connec-tion 30 within the inlet recess 18 corresponds with an arc of a circle having a radius R'.
As will be understood, the thickness of the rupturable portion 22 of the apparatus 10, the material from which the apparatus 10 is formed, e.g., stainless steel, carbon steel, INCONEL*, etc., and the fluid pressure utilized to form the rupturable portion 22 into a concave-convex shape as well as the diameter of the rupturable portion 22 determine the fluid pressure level at which the rupturable portion 22 of the * Trade Mark of International Nickel Company, Inc., used in ~....
~ ';- association with a corrosion resistant alloy of nickel and , --chromium.
733~G
apparatus 10 will reverse and rupture. These variables are adjusted in the manufacture of the apparatus 10 to produce an apparatus having the desired reverse buckling rupture pressure.
In addition, however, it is necessary that the radii R and R' of the curved portions of the connection 30 be of specific size to avoid cracking or other stress failure of the connec-tion 30 when the rupturable portion 22 is formed from a sub-stantially flat state to the concave-convex shape, and to insure that the rupturable portion 22 tears away from the outer annular portion 28 of the body 12 after revesal. The most critical o the radiuses R and R' is the radius R within the outlet recess 20 of the body 12. That is, the radius R
must be large enough so that when the rupturable portion 22 is formed into the concave-convex shape, the connection 30 does not become weakened due to the stretching of the material from which the body 12 is formed at the curved portion of the connection 30 within ~he outlet recess 20. Preferably, the radius R is of a length equal to or greater than one half of the thickness of the rupturable portion 22 prior to forming so that upon forming the connection 30 includes a smooth unbroken transition on the side thereof facing the outlet recess 20 as illustrated in FIGURE 6. The radius R' must be small as compared to the radius R so that upon reversal of the rupturable portion 22, the stress created in the connection 30 at the radius R' causes the connection to shear and the rupturable portion 22 to tear away from the portion 28 of the body 12. Preferably the radius R' is as small as the machininy process used in forming the inlet recess 18 will allow.
In operation of the apparatus 10l the apparatus 10 is sealingly positioned in a pressure relief area with the fluid _g_ ~733~6 pressure from the vessel or system being protected exerted on the convex side 24 of the rupturable portion 22. In the form illustrated in FIGURES 1~6, the apparatus 10 can be conveniently clamped between conventional pipe flanges or other similar clamping means. When the fluid pressure exerted on the convex side 24 of the rupturable portion 22 exceeds the design rupture pressure of the apparatus 10, the rupturable portion 22 re verses itself as shown in FIGURE 3 which causes the stress failure of the connection 30, i.e., the formation of cracks 31 in the connection 30 on the side thereo~ acing the inlet recess 18. As a result of the cracking and stress failure produced in the connection 30 upon reversal of the rupturable portion 22, the entire rupturable portion 22 tears away from the outer annular portion 28 of the body 12 at the connection 30 as illustrated in FIGURE 4 thereby providing a full opening through the body 12 and full relief of fluid pressure from the system or vessel being protected.
As will be readily understood by those skilled in the art, the configuration of the body 12 can take a variety of forms.
For example, the body 12 can be cylindrical as illustrated in FIGU~ES 1-6 so that it can be readily clamped between conven-tional pipe flanges, etc., or as illustrated in FIGURES 7 and 8, the body 12 can be formed in a manner such that it is adapted to be directly connected to a system or vessel containing fluid pressure. That is, the body 12 can include threads 15 on the lower outside surfaces thereof for direct threaded con-nection to a pipe fitting, and the upper outer portion 17 can be formed into a hex head for facilitating the threading of the body 12 into the pipe itting. Further, threads can be provided on the outside surfaces of the body 12 at either end ~733~
and/or within either or both of the recesses 18 and 200 ~ urther, the position of the rupturable portion 22 within the body 12 can vary as can the diameters of the recesses 18 and 20 to produce different desired results. For example, as illustrated in FIGURE 9 the apparatus 10 can be formed with a single recess 18 or 20 whereby the rupturable portion 22 is positioned at either end of the support body 12, or as illustrated in FIGURES 10 and 11, the inlet and outlet cylin-drical recesses 18 and 20 can be of different diameters. In FIGURE 10, the outlet recess 20 is of a larger diameter than the inlet recess 18, and in FIGURE 11 the outlet recess 20 is of a smaller diameter than the inlet recess 18.
The forming of the rupturable portion 22 of the body 12 into a concave-convex shape by applying pressure thereto when in the flat state by way of the outlet recess 20 is particularly well suited for producing quantities of substantially identical apparatus 10. Tha-t is, when the rupturable portions 22 of appa-ratus 10 of suhstantially the same size are formed into concave-convex shapes using the same forming pressure, slight variations in the thickness of the rupturable portions do not materially affect the pressure level at which the units will rupture.
That is, the rupturable portions 22 of units which are slightly thinner than others are formed into concave-convex shapes having greater apex heights which increases the fluid pressure at which the rupturable portions reverse, but those units having thicker rupturable portions are formed into concave-convex shapes of less apex height which reduces the fluid pressure at which the rupturable portions reverse thereby tending to nullify changes in reversal pressure due to slight variations in the thickness of the rupturable portions 22 of different apparatus 10.
10733~6 Further, because the diameter to thickness ratios of the rupturable portions 22 can be closely,controlled, the apparatus 10 can be utilized in extremely high pressure applications and can withstand operating pressures at up to 90 percent of the design rupture pressure without premature failure of the rupturable portions 22.
Thus, the present invention is well adapted to carry out the objects and attain the ends and advantages mentioned as well as those inherent therein. While presently preferred methods of manufacturing the apparatus and particular embodiments thereof have been described ~or purposes of this disclosure, many variations will suggest themselves to those skilled in the art which are encompassed within the spirit of this inven-; tion as defined by the appended claims.
What is claimed is:
When the fluid pressure within the vessel or system exceeds the design rupture pressure of the disk, rupture occurs causing fluid pressure to be relieved from the vessel or system.
Generally, such heretofore developed and used rupture disk assemblies have been welded, soldered, bolted or otherwise clamped together, and the rupture disks have generally been formed of a thin frangible metal or other material having a ; concave-convex shape.
For many years after the initial development of safety pressure relief devices of the rupture disk type, and often presently, the concave-convex rupture disk is placed in the pressure relief assembly so that fluid pressure from the ves-sel or system to be protected is exerted against the concave side of the disk. This arrangement places the disk in tension ; and in order to prevent premature stress failures in -the disk, the operating fluid pressure exerted on the disk, i.e., the normal operation pressure of the vessel or system/ must be considerably less than the pressure at which the disk is designed to rupture.
:1(31733~6 In more recent years, rupture disk assemblies of the so-called "reverse buckling" type have been developed which are capable of operating at 90 percent or more of the pressure at which the disk is designed to rupture. Such assemblies in-clude various parts which are welded, soldered, bolted orotherwise clamped together and include a concave-convex rupture ~;
disk positioned in the assembly so that fluid pressure from the system or vessel to be protected is exerted on the convex side of the disk. This results in the disk being placed in compression during operation and allows the normal fluid pres-sure exerted on the disk to be relatively close to the pressure at which the disk is designed to rupture. Further, reverse buckling rupture disks can withstand pressure fluctuations within the vessel or system over a long period of time without premature failure. Such reverse buckling rupture disk assemblies have heretofore included knife blades upon which the disk im-pales when reversed by excess fluid pressure, or scores or grooves on a surface of the concave-convex portion of the disk creatiny lines of weakness therein so that upon reversal, the concave-convex portion tears along the lines of weakness and opens.
In substantially all of the various safety pressure relief devices developed and used heretofore, various parts are as-sembled and clamped together. In reverse buckling rupture disk assemblies, the rupture disk is often clamped between a pair of special annular members which are in turn clamped between inlet and outlet flanges. Regardless of the particular techniques used for clamping the rupture disk between supporting members, the pressure at which the disk ruptures is often affected and can be changed appreciably by variables in the holdlng or ~7~3~6 clamping means. For example, the rupture pressures of reverse buckling rupture disk assemblies which are welded or soldered together are affected by variations in the welding or soldering heat, the speed at which the welding or soldering is accom-plished, the ~orce exerted on the rupture disk by the supportingmembers, etc. The rupture pressure of reverse buckling rupture disks clamped in bolted assemblies are affected and often substantially changed by variations in the flange confi~uration, the bolting load exerted on the rupture disk, misalignment of the rupture disk within the supporting members, etc. Further, because heretofore used reverse buckling rupture disk assem-blies include various parts which are clamped together, the utilization of such devices in high pressure applications has been limited, i~e., to applications wherein the fluid pressure exerted on the rupture disk are below about 2,000 psig. This limitation hasgenerally been due to the fact that a reverse buckling rupture disk designed for a high pressure application must include a relatively thick concave-convex portion con-nected to an annular flange portion by a transition connection having a large radius. When high pressures are exerted on the disk, unpredictable failure often occurs at the large radius transition connection in that the diameter of the concave-convex portion is reduced as the pressure forces exerted thereon cause the radius portion to roll inward until the disk fails by rolling off the supporting member.
By the present invention, an integral reverse buckling fluid pressure rupturable apparatus is provided which includes only a single part thereby eliminating the problems mentioned above. Further, the apparatus of the present invention is particularly suitable in high pressure applications in that the ~L~733~L6 ~
rupturable portion of the apparatus does not include a large radius transition connection and consequently the heretofore experienced problems of unpredictable failure are obviated.
Summary of the Invention An integral reverse buckling fluid pressure rupturable apparatus comprised of a body formed of a ductile material having opposite ends, having a recess extending inwardly from one of the opposite ends, the internal terminus of the recess being positioned in close proximity to the other of the oppo- -site ends of the body whereby a relatively thin integral rup-turable portion is formed in the body. The rupturable portion of the body is of a concave-convex shape formed by applying pressure on a side of the rupturable portion when in a substan-tially flat state.
It is, therefore, a general object of the present invention to provide an integral pressure formed reverse buckling fluid ;
pressure rupturable apparatus of one-piece integral construc~
tion whereby the requirement of clamping several parts together to form the apparatus is eliminated.
Yet a further object of the present invention is the pro-vision of an integral reverse buckling fluid pressure ruptur-able apparatus which is capable of achieving long service life in extremely high pressure applications at operating pressures up to 90 percent of the pressure at which the apparatus is designed to rupture.
Another object of the present invention is the provision of an integral reverse buckling fluid pressure rupturable apparatus which is economical to produce in lots or groups with little variation in the rupture pressure between indivi-dual apparatus in the group.
~733~6 Other and fuxthex objects, ~eatures and advantages of the present invention will be readily apparent to those skilled in the art upon a reading of the description of preferred embo-diments which follows when taken in conjunction with the accompanying drawings. ;~
Brief Description of the Drawings FIGURE 1 is a perspective view of one form of an integral reverse buckling fluid pressure rupturable apparatus of the present invention.
FIGURE 2 is a cross-sectional view of the apparatus of FIGURE l.
FIGURE 3 is a cross-sectional view similar ko FIGURE 2 showing the apparatus after revesal of the rupturable portion thereof.
; 15 FIGURE 4 is a cross-sectional view similar to FIGURE 2 showing the apparatus after reversal and rupture of the rupturable portion thereof.
FIGURE 5 is an enlarged partial cross-sectional view of the apparatus of FIGURE l prior to forming the rupturable portion thereof into a concave-convex shape.
FIGURE 6 is an enlarged partial cross-sectional view of the apparatus of FIGURE l after forming the rupturable portion thereof into a concave-convex shape.
FIGURE 7 is a perspective view of an alternate form of the apparatus of the present invention.
: FIGURE 8 is a cross-sectional view of the apparatus of FIGURE 7.
FIGURE 9 is a cross-sectional view of apparatus similar to that illustrated in FIGURES 1 and 2, showing a:Lternate arrangements of the rupturable portion thereof.
~L0733~1L6 FIGURE 10 is a cross-sectional view similar to FIGURE 9 showing another alternate arrangement.
FIGURE 11 is a cross-sectional view similar to FIGURE 10 showing yet another alternate arrangement.
Description of Preferred Embodiments Referring now to the drawings, and particularly to FIGURES
1 through 4, one presently preferred form of the apparatus of the present invention is illustrated and generally designated by the numeral 10. The apparatus 10 basically comprises a cylindrical support body 12 formed of a ductile material having opposite parallel ends 14 and 16. As best shown in FIGURES 2-4, an inlet cylindrical recess 18 i.s provided in the body 12 ex-tending from the end 14 thereof inwardly and terminating within the body 12. An outlet cylindrical recess 20 is provided in the support body 12 extending inwardly from the end 16 thereof and terminating in close proximity to the terminus of the recess 18 whereby a relatively thin integral rupturable portion 22 is formed into a concave-convex shape with the convex side 2~ thereof ~acing the inlet recess 1~ and the concave side 26 thereof facing the outlet recess 20. The cylindrical body 12 and the cylindrical inlet and outlet : recesses 18 and 20 therein are positioned coaxially so that the rupturable portion 22 of the body 12 is connected to the remaining outer annular portion 28 of the body 12 by an annular connection 30 lying in a plane perpendicular to the axis of the body 12.
The rupturable portion 22 of the body 12 is formed into its concave-convex shape by first machining the rupturable portion 22 in a flat configuration as shown in FIGURE 5. Pres-sure is then applied to the rupturable portion 22 by way of 11D733~6 the outlet recess 20 so that the rupturable portion 22 is stretched or bulged into the desired concave-convex shape.
While the stretching or bulging of the rupturable portion 22 can be accomplished mechanically, i.e., forcing a plug having a convex surface against the rupturable portion 22 by way of the outlet recess 20 until the rupturable portion 22 is de-formed into a concave-convex shape corresponding with the convex shape of the plu~, the bulging of the rupturable portion 22 is preferably accomplished by exerting fluid pressure on the side 26 thereof by way of the outlet recess 20. In either technique, in order to insure that the connection 30 of the rupturable portion 22 to the outer annular portion 28 of the body 12 is of proper strength, i.e., resists tearing or cracking when the rupturable portion 22 is formed into the concave-convex shape, the recesses 18 and 20 are machined or otherwise formed in the body 12 whereby the connection 30 includes smoothly curved portions on both sides of the ruptur-able portion 22 and the rupturable portion 22 is substantially flat. The curved portion o the connection 30 on the side 26 of the rupturable portion 22 corresponds with an arc of a circle having a radius R. The curved portion of the connec-tion 30 within the inlet recess 18 corresponds with an arc of a circle having a radius R'.
As will be understood, the thickness of the rupturable portion 22 of the apparatus 10, the material from which the apparatus 10 is formed, e.g., stainless steel, carbon steel, INCONEL*, etc., and the fluid pressure utilized to form the rupturable portion 22 into a concave-convex shape as well as the diameter of the rupturable portion 22 determine the fluid pressure level at which the rupturable portion 22 of the * Trade Mark of International Nickel Company, Inc., used in ~....
~ ';- association with a corrosion resistant alloy of nickel and , --chromium.
733~G
apparatus 10 will reverse and rupture. These variables are adjusted in the manufacture of the apparatus 10 to produce an apparatus having the desired reverse buckling rupture pressure.
In addition, however, it is necessary that the radii R and R' of the curved portions of the connection 30 be of specific size to avoid cracking or other stress failure of the connec-tion 30 when the rupturable portion 22 is formed from a sub-stantially flat state to the concave-convex shape, and to insure that the rupturable portion 22 tears away from the outer annular portion 28 of the body 12 after revesal. The most critical o the radiuses R and R' is the radius R within the outlet recess 20 of the body 12. That is, the radius R
must be large enough so that when the rupturable portion 22 is formed into the concave-convex shape, the connection 30 does not become weakened due to the stretching of the material from which the body 12 is formed at the curved portion of the connection 30 within ~he outlet recess 20. Preferably, the radius R is of a length equal to or greater than one half of the thickness of the rupturable portion 22 prior to forming so that upon forming the connection 30 includes a smooth unbroken transition on the side thereof facing the outlet recess 20 as illustrated in FIGURE 6. The radius R' must be small as compared to the radius R so that upon reversal of the rupturable portion 22, the stress created in the connection 30 at the radius R' causes the connection to shear and the rupturable portion 22 to tear away from the portion 28 of the body 12. Preferably the radius R' is as small as the machininy process used in forming the inlet recess 18 will allow.
In operation of the apparatus 10l the apparatus 10 is sealingly positioned in a pressure relief area with the fluid _g_ ~733~6 pressure from the vessel or system being protected exerted on the convex side 24 of the rupturable portion 22. In the form illustrated in FIGURES 1~6, the apparatus 10 can be conveniently clamped between conventional pipe flanges or other similar clamping means. When the fluid pressure exerted on the convex side 24 of the rupturable portion 22 exceeds the design rupture pressure of the apparatus 10, the rupturable portion 22 re verses itself as shown in FIGURE 3 which causes the stress failure of the connection 30, i.e., the formation of cracks 31 in the connection 30 on the side thereo~ acing the inlet recess 18. As a result of the cracking and stress failure produced in the connection 30 upon reversal of the rupturable portion 22, the entire rupturable portion 22 tears away from the outer annular portion 28 of the body 12 at the connection 30 as illustrated in FIGURE 4 thereby providing a full opening through the body 12 and full relief of fluid pressure from the system or vessel being protected.
As will be readily understood by those skilled in the art, the configuration of the body 12 can take a variety of forms.
For example, the body 12 can be cylindrical as illustrated in FIGU~ES 1-6 so that it can be readily clamped between conven-tional pipe flanges, etc., or as illustrated in FIGURES 7 and 8, the body 12 can be formed in a manner such that it is adapted to be directly connected to a system or vessel containing fluid pressure. That is, the body 12 can include threads 15 on the lower outside surfaces thereof for direct threaded con-nection to a pipe fitting, and the upper outer portion 17 can be formed into a hex head for facilitating the threading of the body 12 into the pipe itting. Further, threads can be provided on the outside surfaces of the body 12 at either end ~733~
and/or within either or both of the recesses 18 and 200 ~ urther, the position of the rupturable portion 22 within the body 12 can vary as can the diameters of the recesses 18 and 20 to produce different desired results. For example, as illustrated in FIGURE 9 the apparatus 10 can be formed with a single recess 18 or 20 whereby the rupturable portion 22 is positioned at either end of the support body 12, or as illustrated in FIGURES 10 and 11, the inlet and outlet cylin-drical recesses 18 and 20 can be of different diameters. In FIGURE 10, the outlet recess 20 is of a larger diameter than the inlet recess 18, and in FIGURE 11 the outlet recess 20 is of a smaller diameter than the inlet recess 18.
The forming of the rupturable portion 22 of the body 12 into a concave-convex shape by applying pressure thereto when in the flat state by way of the outlet recess 20 is particularly well suited for producing quantities of substantially identical apparatus 10. Tha-t is, when the rupturable portions 22 of appa-ratus 10 of suhstantially the same size are formed into concave-convex shapes using the same forming pressure, slight variations in the thickness of the rupturable portions do not materially affect the pressure level at which the units will rupture.
That is, the rupturable portions 22 of units which are slightly thinner than others are formed into concave-convex shapes having greater apex heights which increases the fluid pressure at which the rupturable portions reverse, but those units having thicker rupturable portions are formed into concave-convex shapes of less apex height which reduces the fluid pressure at which the rupturable portions reverse thereby tending to nullify changes in reversal pressure due to slight variations in the thickness of the rupturable portions 22 of different apparatus 10.
10733~6 Further, because the diameter to thickness ratios of the rupturable portions 22 can be closely,controlled, the apparatus 10 can be utilized in extremely high pressure applications and can withstand operating pressures at up to 90 percent of the design rupture pressure without premature failure of the rupturable portions 22.
Thus, the present invention is well adapted to carry out the objects and attain the ends and advantages mentioned as well as those inherent therein. While presently preferred methods of manufacturing the apparatus and particular embodiments thereof have been described ~or purposes of this disclosure, many variations will suggest themselves to those skilled in the art which are encompassed within the spirit of this inven-; tion as defined by the appended claims.
What is claimed is:
Claims (11)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An integral reverse buckling fluid pressure rupturable apparatus comprised of:
a body formed of a ductile material having opposite ends, having a cylindrical inlet recess extending inwardly from one of said opposite ends and a cylindrical outlet recess positioned coaxially with said inlet recess and said body extending inward-ly from the other of said opposite ends, the internal termini of said inlet and outlet recesses being positioned in close proximity to each other whereby a relatively thin integral rupturable portion is formed in a concave-convex shape within said body with the convex side thereof facing said inlet recess, the concave-convex rupturable portion being connected to the remaining outer portion of said body by an annular connection lying in a plane substantially perpendicular to the axis of said body and being formed in said concave-convex shape by applying pressure on a side of said rupturable portion when in a substantially flat state by way of said outlet recess;
said annular connection, prior to forming said rupturable portion into said concave-convex shape and when said rupturable portion is in said flate state, including smoothly curved portions on opposite sides thereof connecting said rupturable portion of said body to said outer annular portion of said body, said curved portion within said outlet recess corresponding to an arc of a circle having a radius equal to or greater than one-half of the thickness of said rupturable portion of said body.
a body formed of a ductile material having opposite ends, having a cylindrical inlet recess extending inwardly from one of said opposite ends and a cylindrical outlet recess positioned coaxially with said inlet recess and said body extending inward-ly from the other of said opposite ends, the internal termini of said inlet and outlet recesses being positioned in close proximity to each other whereby a relatively thin integral rupturable portion is formed in a concave-convex shape within said body with the convex side thereof facing said inlet recess, the concave-convex rupturable portion being connected to the remaining outer portion of said body by an annular connection lying in a plane substantially perpendicular to the axis of said body and being formed in said concave-convex shape by applying pressure on a side of said rupturable portion when in a substantially flat state by way of said outlet recess;
said annular connection, prior to forming said rupturable portion into said concave-convex shape and when said rupturable portion is in said flate state, including smoothly curved portions on opposite sides thereof connecting said rupturable portion of said body to said outer annular portion of said body, said curved portion within said outlet recess corresponding to an arc of a circle having a radius equal to or greater than one-half of the thickness of said rupturable portion of said body.
2. An integral reverse buckling fluid pressure rupturable apparatus comprising:
a support body formed of ductile material having opposite ends;
a first cylindrical recess extending inwardly from one of said opposite ends of said body forming a fluid pressure inlet therein, the terminus of said first recess being positioned transversely to the axis of said body and being convex in shape;
a second cylindrical recess extending coaxially inwardly from the other of said opposite ends of said body forming a fluid pressure outlet therein, the terminus of said second recess being positioned transversely to the axis of said body, being concave in shape and lying in close proximity to the terminus of said first recess whereby a relatively thin concave-convex fluid pressure rupturable portion is positioned interiorly of said body;
said concave-convex rupturable portion of said body being formed in said concave-convex shape by applying fluid pressure on a side of said rupturable portion when in a substantially flat state by way of said outlet recess and being connected to the remaining annular outer portion of said body by an annular connection lying in the plane substantially perpendicular to the axis of said body;
said annular connection, prior to forming said rupturable portion into said concave-convex shape and when said rupturable portion is in said flat state, including smoothly curved portions on opposite sides thereof connecting said rupturable portion of said body to said outer annular portion of said body, said curved portion within said outlet recess corresponding to an arc of a circle having a radius equal to or greater than one-half the thickness of said rupturable portion of said body.
a support body formed of ductile material having opposite ends;
a first cylindrical recess extending inwardly from one of said opposite ends of said body forming a fluid pressure inlet therein, the terminus of said first recess being positioned transversely to the axis of said body and being convex in shape;
a second cylindrical recess extending coaxially inwardly from the other of said opposite ends of said body forming a fluid pressure outlet therein, the terminus of said second recess being positioned transversely to the axis of said body, being concave in shape and lying in close proximity to the terminus of said first recess whereby a relatively thin concave-convex fluid pressure rupturable portion is positioned interiorly of said body;
said concave-convex rupturable portion of said body being formed in said concave-convex shape by applying fluid pressure on a side of said rupturable portion when in a substantially flat state by way of said outlet recess and being connected to the remaining annular outer portion of said body by an annular connection lying in the plane substantially perpendicular to the axis of said body;
said annular connection, prior to forming said rupturable portion into said concave-convex shape and when said rupturable portion is in said flat state, including smoothly curved portions on opposite sides thereof connecting said rupturable portion of said body to said outer annular portion of said body, said curved portion within said outlet recess corresponding to an arc of a circle having a radius equal to or greater than one-half the thickness of said rupturable portion of said body.
3. A method of manufacturing an integral reverse buckling fluid pressure rupturable apparatus comprising:
forming a recess in a support body having opposite ends, said recess extending from one of said opposite ends of said body towards the other and terminating in close proximity to said other end whereby a relatively thin integral fluid pressure rupturable portion remains in said body; and applying pressure on a side of said rupturable portion of said body so that said rupturable portion is formed into a concave-convex shape.
forming a recess in a support body having opposite ends, said recess extending from one of said opposite ends of said body towards the other and terminating in close proximity to said other end whereby a relatively thin integral fluid pressure rupturable portion remains in said body; and applying pressure on a side of said rupturable portion of said body so that said rupturable portion is formed into a concave-convex shape.
4. The method of claim 3 wherein said opposite ends of said body are flat and said recess formed in said body is of cylindrical shape.
5. A method of manufacturing an integral reverse buckling fluid pressure rupturable apparatus comprising the steps of:
forming an inlet recess in a support body having opposite ends, said inlet recess extending inwardly from one of said opposite ends and terminating interiorly of said body;
forming an outlet recess in said body extending inwardly from the other of said opposite ends of said body and terminating in close proximity to the terminus of said inlet recess whereby a relatively flat integral fluid pressure rupturable portion is positioned interiorly of said body; and applying pressure to a side of said rupturable portion of said body by way of said outlet recess so that said rupturable portion is formed into a concave-convex shape.
forming an inlet recess in a support body having opposite ends, said inlet recess extending inwardly from one of said opposite ends and terminating interiorly of said body;
forming an outlet recess in said body extending inwardly from the other of said opposite ends of said body and terminating in close proximity to the terminus of said inlet recess whereby a relatively flat integral fluid pressure rupturable portion is positioned interiorly of said body; and applying pressure to a side of said rupturable portion of said body by way of said outlet recess so that said rupturable portion is formed into a concave-convex shape.
6. The method of claim 5 wherein said inlet and outlet recesses are cylindrical and are formed coaxially in said body whereby said rupturable portion of said body is connected to the remaining outer portion of said body by an annular connection lying in a plane transverse to the axis of said body.
7. The method of claim 6 wherein the step of forming said outlet recess in said body includes forming a smoothly curved annular transition from said flat rupturable portion to the sides of said outlet recess so that said curved portion of said annular connection within said outlet recess corresponds to an arc of a circle having a radius equal to or greater than one-half the thickness of said rupturable portion of said body.
8. The method of claim 6 wherein the pressure applied to a side of said rupturable portion is fluid pressure.
9. A method of manufacturing an integral reverse buckling fluid pressure rupturable apparatus comprising the steps of:
machining a cylindrical inlet recess in a support body having opposite ends extending inwardly from one of said opposite ends of said body and terminating in a flat surface interiorly of said body;
machining a cylindrical outlet recess in said support body extending inwardly from the other of said opposite ends thereof and terminating in a flat surface in close proximity to the terminus of said inlet recess whereby a relatively thin fluid pressure rupturable portion of said body is positioned interiorly thereof, the connection of said flat surface with the sides of said outlet recess including a smoothly curved transition; and applying fluid pressure by way of said outlet recess in said body on said rupturable portion thereof so that said rupturable portion is formed into a concave-convex shape.
machining a cylindrical inlet recess in a support body having opposite ends extending inwardly from one of said opposite ends of said body and terminating in a flat surface interiorly of said body;
machining a cylindrical outlet recess in said support body extending inwardly from the other of said opposite ends thereof and terminating in a flat surface in close proximity to the terminus of said inlet recess whereby a relatively thin fluid pressure rupturable portion of said body is positioned interiorly thereof, the connection of said flat surface with the sides of said outlet recess including a smoothly curved transition; and applying fluid pressure by way of said outlet recess in said body on said rupturable portion thereof so that said rupturable portion is formed into a concave-convex shape.
10. The method of claim 9 wherein said inlet and outlet recesses are formed coaxially in said body whereby said rupturable portion of said body is connected to the remaining outer portion of said body by an annular connection lying in a plane transverse to the axis of said body.
11. The method of claim 10 wherein said smoothly curved trans-ition connection between the sides of said outlet recess and said flat surface of said rupturable portion formed in said body corresponds to an arc of a circle having a radius equal to or greater than one-half the thickness of said rupturable portion prior to applying fluid pressure on said rupturable portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA273,268A CA1073316A (en) | 1977-03-07 | 1977-03-07 | Fluid pressure rupturable apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA273,268A CA1073316A (en) | 1977-03-07 | 1977-03-07 | Fluid pressure rupturable apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1073316A true CA1073316A (en) | 1980-03-11 |
Family
ID=4108081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA273,268A Expired CA1073316A (en) | 1977-03-07 | 1977-03-07 | Fluid pressure rupturable apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1073316A (en) |
-
1977
- 1977-03-07 CA CA273,268A patent/CA1073316A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4146047A (en) | Integral fluid pressure rupturable apparatus | |
| US6192914B1 (en) | Rupture disk safety member | |
| US4404982A (en) | Rupturable pressure relief apparatus | |
| US4553559A (en) | Rupturable pressure relief assembly | |
| US4102167A (en) | Method of manufacturing integral fluid pressure rupturable apparatus | |
| CA2241251C (en) | Threaded fastener system | |
| US5167337A (en) | Scored reverse buckling rupture disk assembly | |
| US6178983B1 (en) | Rupture disk assembly | |
| US4838447A (en) | Pressure relief device with conical reverse buckling disc | |
| JPS6069370A (en) | Safety device with knife for explosion for limiting pressure of fluid and diaphragm | |
| US4943095A (en) | Stepped thread and cutoff thread joint exhibiting excellent fatigue resistance | |
| US4795051A (en) | Rupturable fluid pressure relief apparatus and manufacturing method | |
| US6349737B2 (en) | Bursting disc assembly retaining ring with a clover leaf cutting pattern and projection | |
| US7870865B2 (en) | Safety pressure relief device | |
| US5558114A (en) | Eccentric scored rupture disk assembly | |
| CA1073316A (en) | Fluid pressure rupturable apparatus | |
| CA1087066A (en) | Fluid pressure relief apparatus | |
| CA1229540A (en) | Scored rupture disk apparatus | |
| CA1156569A (en) | Pressure relief device for internally pressurized fluid container | |
| GB1562329A (en) | Safety pressure relief apparatus | |
| EP0010913A1 (en) | Improvements in or relating to reverse buckling disc assemblies | |
| EP0039599B1 (en) | Integral end closure and hub for a ball valve body | |
| JPS6218370B2 (en) | ||
| WO2002029296A1 (en) | Pressure release bursting disc | |
| JPH07280149A (en) | Flange joint structure for steel pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |