US3775251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for pressure vessels, particularly of the type associated with nuclear reactors
Assignee: Siemens AG
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Filing: 1971-09-03
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Granted: 1973-11-27
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Expires: 1991-09-03
Abstract
Abstract As a safety measure relating to pressure vessels of nuclear reactors, there is provided a safety tank surrounding the pressure vessel at least in its upper range and a guard ring overlapping the upper edge of the safety tank. The guard ring is disconnectably secured by means of bolts extending within the safety tank to a carrier ring situated under the nipples of the pressure vessel.
Inventors
- 👤 H Schabert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:40
CPC Classifications
G; G21; G21C; G21C9/00; G21C9/001; G21C13/00; G21C13/02; G21C13/06; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S220/00; Y10S220/90
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
134 words
In a safety device for a pressure vessel, the latter including circumferentially arranged inlet and outlet nipples and a removable cover secured to the pressure vessel by cover bolts arranged along a circle, the improvement comprising A. a safety tank spacedly surrounding at least an upper terminal portion of said pressure vessel including the range of said nipples, said safety tank being normally isolated from the pressure prevailing in said pressure vessel, said safety tank having an upper edge, B. a guard ring essentially overlapping said upper edge of said safety tank and said cover bolts, C. a support means surrounding said pressure vessel below said nipples and C. tightening members disconnectably fastening said guard ring to said support means, said tightening members being arranged along a circle and extending within said safety tank.
Claim 2
Dependent Claim
134 words
In a safety device for a pressure vessel, the latter including circumferentially arranged inlet and outlet nipples and a removable cover secured to the pressure vessel by cover bolts arranged along a circle, the improvement comprising A. a safety tank spacedly surrounding at least an upper terminal portion of said pressure vessel including the range of said nipples, said safety tank being normally isolated from the pressure prevailing in said pressure vessel, said safety tank having an upper edge, B. a guard ring essentially overlapping said upper edge of said safety tank and said cover bolts, C. a support means surrounding said pressure vessel below said nipples and C. tightening members disconnectably fastening said guard ring to said support means, said tightening members being arranged along a circle and extending within said safety tank.
Claim 3
Dependent Claim
37 words
An improvement as defined in claim 1, wherein the cross section of said guard ring is such that more than one half of its bending resistance is within the circle along which said tightening means are disposed.
Claim 4
Dependent Claim
39 words
An improvement as defined in claim 1, wherein the upper portion of said safety tank is formed of a cylindrical casing loosely sitting on a mid portion of said safety tank and being directly affixed to said guard ring.
Claim 5
Dependent Claim
19 words
An improvement as defined in claim 1, wherein said tightening members associated with said guard ring are outwardly divergent.
Claim 6
Dependent Claim
16 words
An improvement as defined in claim 4, wherein said tightening members are formed as tension bolts.
Claim 7
Dependent Claim
39 words
An improvement as defined in claim 1, including a guard cover situated above said removable cover within the circle along which said cover bolts are arranged, said guard cover including an outer marginal range overlapped by said guard ring.
Claim 8
Dependent Claim
20 words
An improvement as defined in claim 6, wherein said guard ring and said guard cover constitute a jointly removable unit.
Claim 9
Dependent Claim
17 words
An improvement as defined in claim 1, wherein said support means is formed as a carrier ring.
Claim 10
Dependent Claim
31 words
An improvement as defined in claim 8, including a concrete cylinder surrounding said pressure vessel and formed as a concrete pressure container, said carrier ring being embedded in said concrete cylinder.
Claim 11
Dependent Claim
32 words
An improvement as defined in claim 1, including a concrete cylinder surrounding said pressure vessel and formed as a concrete pressure container, said tightening means being directly anchored in said concrete cylinder.
Claim 12
Dependent Claim
24 words
An improvement as defined in claim 1, including a safety tank portion surrounding said pressure vessel below said nipples and below said support means.
Claim 13
Dependent Claim
21 words
An improvement as defined in claim 11, wherein said safety tank portion is in a face-to-face engagement with said pressure vessel.
Claim 14
Dependent Claim
43 words
An improvement as defined in claim 11, wherein said safety tank portion spacedly surrounds said pressure vessel, said improvement includes a steel rib structure at least partially filling the space between said safety tank portion and said pressure vessel below said support means.
Claim 15
Dependent Claim
24 words
An improvement as defined in claim 1, wherein said support means is formed as a carrier ring constituting one part of said safety tank.
Claim 16
Dependent Claim
25 words
An improvement as defined in claim 11, wherein said support means is formed as a carrier ring constituting one part of said safety tank portion.
Claim 17
Dependent Claim
44 words
An improvement as defined in claim 1, including removable protective filler members disposed in the range of said tightening members between said safety tank and said pressure vessel on the one hand and said guard ring and said support means on the other hand.
Claim 18
Dependent Claim
44 words
An improvement as defined in claim 6, including a safety tank portion surrounding said pressure vessel below said nipples and below said support means; said safety tank, said safety tank portion, said guard ring and said guard cover are provided with external insulating means.
Claim 19
Dependent Claim
20 words
An improvement as defined in claim 6, including an overflow clearance provided between said vessel cover and said guard cover.
Claim 20
Dependent Claim
58 words
An improvement as defined in claim 1, including A. a concrete cylinder surrounding said pressure vessel, B. a safety tank portion surrounding said pressure vessel below said nipples and below said support means and C. a pressure-resistant oblique conduit passing through said concrete cylinder and said safety tank portion and merging into the space below said pressure vessel.
Claim 21
Dependent Claim
19 words
An improvement as defined in claim 1, including additional support means engaging lower outer portions of said pressure vessel.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |