US3667644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversing rupture disc for protecting equipment from excessive pressure and method of manufacture
Assignee: Interatom Internationale Atomreaktorbau GmbH
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Filing: 1970-05-22
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Granted: 1972-06-06
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Expires: 1990-05-22
Abstract
Abstract A reversing rupture disc assembly for protecting a vessel or other apparatus from excessive pressure has a carrier ring mountable in the apparatus and a reversing rupture disc tightly positioned in the ring. The disc has a curvature obtained by imparting a force thereto so as to strain the material from which the disc is made. The disc is disposed in the ring, so that the convex surface of the disc is directed toward the pressure. The disc has a weak buckling zone located in the mid-region of the disc, whereby the disc buckles inwardly and ruptures in response to the excessive pressure, the disc deviating from a spherical form at the mid-region, so that the radius of curvature of the disc decreases going from the mid-region to the edge of the disc and, so that the sector angle phi of the disc is greater than 3.82 square root S/R, where S is the disc thickness and R is the average radius of curvature of the disc. The material of which the disc is made has a positive stress-strain curve after undergoing the strain required to obtain the curvature, the curve having a slope d sigma /d Epsilon greater than about 100 kgf/mm2.
Inventors
- 👤 Manfred Fortmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:54
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/14; F16K17/16; F16K17/1606
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
215 words
Reversing blow-out disc assembly for protecting a vessel or other apparatus from excessive pressure comprising a carrier ring mountable in said apparatus and a reversing blow-out disc tightly secured along the periphery thereof to said ring, said disc having a curvature obtained by imparting a force thereto so as to strain the material from which said disc is made, said disc being disposed in said ring and having a convex surface toward the pressure, said disc having a weak buckling zone located in the mid-region of said disc, whereby said disc buckles inwardly to reverse snap like a membrane and separates along said periphery from said ring in response to the excessive pressure, said disc deviating from a spherical form at said mid-region, so that the radius of curvature of said disc decreases going from said midregion to the edge of said disc and, so that the sector angle phi of said disc is greater than 3,82 square root S/R where S is the disc thickness and R is the average radius of curvature of the disc, and said material of which said disc is made still has a positive stress-strain curve after undergoing said strain required to obtain said curvature, said curve having a slope d sigma /d Epsilon greater than about 100 Kgf/mm2.
Claim 2
Dependent Claim
215 words
Reversing blow-out disc assembly for protecting a vessel or other apparatus from excessive pressure comprising a carrier ring mountable in said apparatus and a reversing blow-out disc tightly secured along the periphery thereof to said ring, said disc having a curvature obtained by imparting a force thereto so as to strain the material from which said disc is made, said disc being disposed in said ring and having a convex surface toward the pressure, said disc having a weak buckling zone located in the mid-region of said disc, whereby said disc buckles inwardly to reverse snap like a membrane and separates along said periphery from said ring in response to the excessive pressure, said disc deviating from a spherical form at said mid-region, so that the radius of curvature of said disc decreases going from said midregion to the edge of said disc and, so that the sector angle phi of said disc is greater than 3,82 square root S/R where S is the disc thickness and R is the average radius of curvature of the disc, and said material of which said disc is made still has a positive stress-strain curve after undergoing said strain required to obtain said curvature, said curve having a slope d sigma /d Epsilon greater than about 100 Kgf/mm2.
Claim 3
Dependent Claim
39 words
In the disc assembly according to claim 1, said material of which said disc is made being a high creep resistant material, said material being in a solution annealing condition before said force is imparted to obtain said curvature.
Claim 4
Dependent Claim
14 words
In the disc assembly according to claim 2, said material being a nickel-base alloy.
Claim 5
Dependent Claim
32 words
A reversing blow-out disc assembly according to claim 1, said assembly including holding means at the junction of said disc and said ring for securing and sealing said disc to the latter.
Claim 6
Dependent Claim
17 words
In a reversing blow-out disc assembly according to claim 4, said holding means being a solder joint.
Claim 7
Dependent Claim
42 words
In a reversing blow-out disc assembly according to claim 4, said ring having shoulder means disposed on the inner periphery thereof and adjacent said disc, said holding means being a weld joint joining said disc to said ring to said shoulder means.
Claim 8
Dependent Claim
34 words
In a reversing blow-out disc assembly according to claim 6, said weld joint being disposed at said junction so as to join said disc to said ring at the convex side of said disc.
Claim 9
Dependent Claim
106 words
Method of producing a reversing blow-out disc which comprises the steps of tensioning a plane sheet between two circular holding members, successively applying and removing fluid pressure to said sheet for imparting a curvature thereto, each successive application of pressure being of greater intensity than the preceding application, measurinG the height of said curvature after each application of pressure has been removed, discontinuing said applications of pressure when said height has reached a value determined from the initial thickness of said sheet and the pressure at which said disc shall buckle and rupture, and separating said disc from its rim portion held between said holding members.
Claim 10
Dependent Claim
106 words
Method of producing a reversing blow-out disc which comprises the steps of tensioning a plane sheet between two circular holding members, successively applying and removing fluid pressure to said sheet for imparting a curvature thereto, each successive application of pressure being of greater intensity than the preceding application, measurinG the height of said curvature after each application of pressure has been removed, discontinuing said applications of pressure when said height has reached a value determined from the initial thickness of said sheet and the pressure at which said disc shall buckle and rupture, and separating said disc from its rim portion held between said holding members.
Claim 11
Dependent Claim
18 words
In a method according to claim 8, said height of said curvature being measured by a feeler mechanism.
Claim 12
Dependent Claim
24 words
The method according to claim 8, said method including the final step of heat treating said disc so as to precipitation harden the same.
Claim 13
Dependent Claim
34 words
The method according to claim 8, wherein the reversing rupture disc assembly is produced by including the step of joining the disc to a carrier ring after said curvature is imparted to said disc.
Claim 14
Dependent Claim
17 words
In a method according to claim 11, said disc being jointed to said carrier ring by welding.
Claim 15
Dependent Claim
17 words
In a method according to claim 11, said disc being joined to said carrier ring by soldering.
Claim 16
Dependent Claim
25 words
The method according to claim 11, said method including the step of heat treating said disc while simultaneously soldering the latter to said carrier ring.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |