US3882591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of constructing a low temperature liquefied gas tank of a membrane type
Assignee: Eneos Globe Corp
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Filing: 1973-03-22
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Granted: 1975-05-13
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Expires: 1993-03-22
Abstract
Abstract A method of constructing a low temperature liquefied gas tank of a membrane type comprising an inner membranous vessel provided at the inside of a rigid outer vessel with interposition of a heat insulating layer, said inner membranous vessel being formed to have at least one seam at side wall portions thereof, characterized by the steps of provisionally forming said inner membranous vessel at least in two parts to be connected with each other along said seam, said two parts being formed as oversized so that adjacent edge portions of said two parts overlap one over the other by an amount corresponding to the contraction of said inner membranous vessel in a low temperature operating condition, displacing the side wall portions of said two parts relative to each other so as to eliminate the overlapping of said adjacent edge portions, connecting said adjacent edge portions with each other to form said seam while keeping said side wall portions displaced as before, and filling up a space left between said outer vessel and side wall portions of said inner membranous vessel with a compression resistant heat insulating material to form said heat insulating layer while maintaining said side wall portions in a displaced state, whereby said inner membranous vessel is formed to have a marginal slack which compensates for the contraction thereof in a low temperature operating condition.
Inventors
- 👤 Katsuro Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:08
CPC Classifications
B; B63; B63B; B63B25/00; B63B25/02; B63B25/08; B63B25/12; B63B25/16; F; F17; F17C; F17C3/00; F17C3/02; F17C3/025; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2270/00; F17C2270/01; F17C2270/0102; F17C2270/0105; F17C2270/0107; Y; Y10; Y10S; Y10S220/00; Y10S220/09; Y10S220/901; Y10S220/902; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428; Y10T29/49826; Y10T29/49879; Y10T29/49888; Y10T29/49893; Y10T29/49904
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
260 words
A method of constructing a low temperature liquefied gas tank of the membrane type, said tank comprising an other vessel of a rigid structure, a heat insulating layer provided at the inside of said outer vessel, flat side wall portions provided at the inside of said heat insulating layer and an inner membranous vessel provided further at the inside of said flat side wall portions, said inner membranous vessel being formed to have curved edge portions and at least one substantially flat seam at the flat side wall portions thereof, characterized by the steps of provisionally forming said inner membranous vessel in two parts to be connected with each other along said seam, said two parts being formed as oversized portions so that the adjacent edge portions of said two parts overlap with each other by an amount corresponding to the contraction of said inner membranous vessel at low temperature operating conditions, displacing the side wall portions of said two parts relative to each other along the surface thereof so as to eliminate the overlapping of said adjacent edge portions, said displacing being effected by provisionally shortening the radius of curvature of said curved edge portions, connecting said adjacent edge portions with each other to form said seam while keeping said side wall portions displaced, and filling up a space left between said outer vessel and said wall portions of said inner membranous vessel with a heat insulating material having compression resisting characteristics to form said heat insulating layer while still maintaining said side wall portions in a displaced state.
Claim 2
Independent Claim
260 words
A method of constructing a low temperature liquefied gas tank of the membrane type, said tank comprising an other vessel of a rigid structure, a heat insulating layer provided at the inside of said outer vessel, flat side wall portions provided at the inside of said heat insulating layer and an inner membranous vessel provided further at the inside of said flat side wall portions, said inner membranous vessel being formed to have curved edge portions and at least one substantially flat seam at the flat side wall portions thereof, characterized by the steps of provisionally forming said inner membranous vessel in two parts to be connected with each other along said seam, said two parts being formed as oversized portions so that the adjacent edge portions of said two parts overlap with each other by an amount corresponding to the contraction of said inner membranous vessel at low temperature operating conditions, displacing the side wall portions of said two parts relative to each other along the surface thereof so as to eliminate the overlapping of said adjacent edge portions, said displacing being effected by provisionally shortening the radius of curvature of said curved edge portions, connecting said adjacent edge portions with each other to form said seam while keeping said side wall portions displaced, and filling up a space left between said outer vessel and said wall portions of said inner membranous vessel with a heat insulating material having compression resisting characteristics to form said heat insulating layer while still maintaining said side wall portions in a displaced state.
Claim 3
Dependent Claim
40 words
A method according to claim 1, wherein at least one of said adjacent portions of said two parts is adapted to be provided with a belt member having a width corresponding to the overlapping amount of said adjacent edge portions.
Claim 4
Dependent Claim
34 words
A method according to claim 1, wherein said inner membranous vessel is formed as a double-layered membranous vessel including first and second membranous vessels, said first membranous vessel enclosing said second membranous vessel therein.
Claim 5
Independent Claim
46 words
A method according to cliam 3, wherein, said first inner membranous vessel comprises two parts, at least one of said adjacent edge portions of said two parts being provided with a belt member having a width corresponding to the overlapping amount of said adjacent edge portions.
Claim 6
Independent Claim
46 words
A method according to cliam 3, wherein, said first inner membranous vessel comprises two parts, at least one of said adjacent edge portions of said two parts being provided with a belt member having a width corresponding to the overlapping amount of said adjacent edge portions.
Claim 7
Dependent Claim
52 words
The method of claim 3, wherein the first inner membranous vessel comprises two parts which, when displaced, defined an incomplete portion between the adjacent edges of said two parts, said adjacent edges being joined together by a belt having a width at least as large as the distance between said adjacent edges.
Claim 8
Dependent Claim
50 words
A method according to claim 1, wherein a protecting plate is mounted at the outside of said side wall portion of said inner membranous vessel before said space disposed between said outer vessel and said side wall portion of said inner membranous vessel is filled will a heat insulating material.
Claim 9
Dependent Claim
52 words
A method according to claim 1, wherein said inner membranous vessel is provided with a positive pressure sufficient to support the side wall portions thereof against the pressure applied by the heat insulating material charged into the space to form said heat insulating layer when said heat insulating layer is being formed.
Claim 10
Dependent Claim
35 words
A method according to claim 1, wherein the radius of curvature of said curved edge portions is shortened by applying a preSsing force to said curved edge portions from the inside of the inner vessel.
Claim 11
Dependent Claim
35 words
A method according to claim 1, wherein the radius of curvature of said curved edge portions is shortened by applying a drawing force to said curved edge portions from the outside of the inner vessel.
Claim 12
Dependent Claim
20 words
The method according to claim 1, wherein the heat-insulating material is foamed sulfur containing glass wool as a reinforcing material.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |