Patent US3926134A successfully refreshed from Google Patents.
US3926134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prestressed concrete tanks for liquid natural gas tankers
Assignee: Preload Technology Inc
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Filing: 1974-12-12
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Granted: 1975-12-16
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Expires: 1994-12-12
Abstract
Abstract A tank for cryogenic liquids, specifically liquid natural gas, adapted for placement within a conventional marine transportation vessel is shown. The tank is preferably cylindrical and of circular cross section and is comprised of prestressed concrete with steel heads. The tank wall is made up of a series of concrete, modular tank wall sections which are circumferentially prestressed by steel tendons and which have holes therein for through-passage of axial prestressing tendons. A steel sheath anchored to the concrete wall provides a secondary barrier against leakage of the liquid natural gas cargo within the tank. The modular wall sections are separated by concrete or steel stiffening disks. The tank is formed by alternately positioning a number of modular wall sections and stiffening disks. Flat, concrete, stiffening plates which are integral with the modular tank wall sections and are radially-axially positioned within the tank further stiffen the structure. The walls and the stiffening plates are axially prestressed and the heads are attached. The tank is supported on the annular stiffening disks which are joined to the tank wall. The tank makes efficient use of the vessels cubic and is inexpensive to construct. By preforming and prestressing the modular units and thereafter erecting them rapidly at the ship-building site or at a removed fitting out site, important economies are achieved.
Inventors
- 👤 John J Closner
- 👤 Tadeusz Josef Marchaj
- 👤 Sven Hjalmar Wichman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:57
CPC Classifications
B; B63; B63B; B63B25/00; B63B25/02; B63B25/08; B63B25/12; F; F17; F17C; F17C3/00; F17C3/02; F17C3/025; F17C2203/00; F17C2203/06; F17C2203/0634; F17C2203/0678; F17C2221/00; F17C2221/03; F17C2221/032; F17C2221/033; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2260/00; F17C2260/01; F17C2260/016; F17C2270/00; F17C2270/01; F17C2270/0102; F17C2270/0105; Y; Y10; Y10S; Y10S220/00; Y10S220/901
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
194 words
A marine transport system for cryogenic liquids, comprising the elements of: a. an outer marine hull; b. a cradle for a horizontally-oriented, cylindrical tank formed from prestressed concrete and having a circular cross-section; and c. a horizontally-oriented, cylindrical tank of circular crosssection, adapted for containing cryogenic liquids positioned in said cradle, comprising the elements of: 1. a concrete, cylindrical tank wall having a plurality of steel prestressing tendons located therein in axial orientation; 2. a steel sheath anchored to the exterior surface of said wall; 3. a prestressing tendon wrapped essentially circumferentially about the exterior of said steel sheath; 4. at least two, annular stiffening disks positioned coaxially within the said wall said disks having holes therein for through-passage of axially oriented prestressing tendons; 5. a plurality of stiffening plates positioned radially-axially with respect to said tank and abutting at both axial extensions thereof, said stiffening disks and at their radial outermost extension, the said cylindrical tank wall, said stiffening plates having essentially axially oriented prestressing tendonS therein; 6. steel heads defining the ends of said cylindrical tank and attached to said stiffening disks; and 7. inlet and outlet means for said cryogenic liquid.
Claim 2
Dependent Claim
194 words
A marine transport system for cryogenic liquids, comprising the elements of: a. an outer marine hull; b. a cradle for a horizontally-oriented, cylindrical tank formed from prestressed concrete and having a circular cross-section; and c. a horizontally-oriented, cylindrical tank of circular crosssection, adapted for containing cryogenic liquids positioned in said cradle, comprising the elements of: 1. a concrete, cylindrical tank wall having a plurality of steel prestressing tendons located therein in axial orientation; 2. a steel sheath anchored to the exterior surface of said wall; 3. a prestressing tendon wrapped essentially circumferentially about the exterior of said steel sheath; 4. at least two, annular stiffening disks positioned coaxially within the said wall said disks having holes therein for through-passage of axially oriented prestressing tendons; 5. a plurality of stiffening plates positioned radially-axially with respect to said tank and abutting at both axial extensions thereof, said stiffening disks and at their radial outermost extension, the said cylindrical tank wall, said stiffening plates having essentially axially oriented prestressing tendonS therein; 6. steel heads defining the ends of said cylindrical tank and attached to said stiffening disks; and 7. inlet and outlet means for said cryogenic liquid.
Claim 3
Dependent Claim
11 words
a steel sheath anchored to the exterior surface of said wall;
Claim 4
Dependent Claim
11 words
a steel sheath anchored to the exterior surface of said wall;
Claim 5
Dependent Claim
26 words
A marine transport system as defined in claim 1, wherein said cradle comprises transverse structural members positioned below the lower parts of said annular stiffening disks.
Claim 6
Dependent Claim
49 words
A marine transport system as recited in claim 2, wherein the diameter of the said annular stiffening disks is greater then the diameter of the concrete, cylindrical tank wall, so as to provide a protruding support post, which is positioned upon the said transverse structural members of said cradle.
Claim 7
Dependent Claim
13 words
a prestressing tendon wrapped essentially circumferentially about the exterior of said steel sheath;
Claim 8
Dependent Claim
13 words
a prestressing tendon wrapped essentially circumferentially about the exterior of said steel sheath;
Claim 9
Dependent Claim
24 words
at least two, annular stiffening disks positioned coaxially within the said wall said disks having holes therein for through-passage of axially oriented prestressing tendons;
Claim 10
Dependent Claim
24 words
at least two, annular stiffening disks positioned coaxially within the said wall said disks having holes therein for through-passage of axially oriented prestressing tendons;
Claim 11
Dependent Claim
43 words
a plurality of stiffening plates positioned radially-axially with respect to said tank and abutting at both axial extensions thereof, said stiffening disks and at their radial outermost extension, the said cylindrical tank wall, said stiffening plates having essentially axially oriented prestressing tendonS therein;
Claim 12
Dependent Claim
43 words
a plurality of stiffening plates positioned radially-axially with respect to said tank and abutting at both axial extensions thereof, said stiffening disks and at their radial outermost extension, the said cylindrical tank wall, said stiffening plates having essentially axially oriented prestressing tendonS therein;
Claim 13
Dependent Claim
16 words
steel heads defining the ends of said cylindrical tank and attached to said stiffening disks; and
Claim 14
Dependent Claim
16 words
steel heads defining the ends of said cylindrical tank and attached to said stiffening disks; and
Claim 15
Dependent Claim
8 words
inlet and outlet means for said cryogenic liquid.
Claim 16
Dependent Claim
8 words
inlet and outlet means for said cryogenic liquid.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |