US3969812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing an overwrapped pressure vessel
Assignee: Lockheed Martin Corp
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Filing: 1974-04-19
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Granted: 1976-07-20
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Expires: 1994-04-19
Abstract
Abstract A pressure vessel of the type wherein a metallic liner in the shape of a cylindrical portion with a dome-shaped portion at each end thereof is overwrapped by a plurality of layers of resin coated, single fiberglass filaments. A four-step wrapping technique reinforces the vessel with overwrap material at the most likely areas for vessel failure. Overwrapping of the vessel is followed by a sizing pressurization cycle which induces a compressive prestress into the liner and thereby permits the liner to deform elastically through an increased strain range.
Inventors
- 👤 Emory J. Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:03
CPC Classifications
F; F17; F17C; F17C1/00; F17C1/16; B; B21; B21D; B21D51/00; B21D51/16; B21D51/24; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/60; B29C53/602; B29C53/605; B65; B65D; B65D23/00; B65D23/08; B29L; B29L2031/00; B29L2031/712; B29L2031/7154; B29L2031/7156; F17C2209/00; F17C2209/21; F17C2209/2154; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805; Y10T29/49826; Y10T29/49863; Y10T29/49874; Y10T29/49885
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
125 words
A method of manufacturing a pressure vessel including the steps of forming a liner in the shape of a cylindrical portion and a dome portion at each end thereof, overwrapping the liner by winding filament material thereabout in the following sequence: a. wrapping filament material about the liner in the polar direction to form a first polar overwrap, b. wrapping filament material over the first polar overwrap in a cylindrically oriented direction and of sufficient extent to cover the junctions of the cylindrical portion with the dome portions to form a first cylindrical overwrap, and c. wrapping filament material over the first cylindrical overwrap in the polar direction to form a second polar overwrap which holds the cylindrical overwrap against movement relative to the liner.
Claim 2
Independent Claim
125 words
A method of manufacturing a pressure vessel including the steps of forming a liner in the shape of a cylindrical portion and a dome portion at each end thereof, overwrapping the liner by winding filament material thereabout in the following sequence: a. wrapping filament material about the liner in the polar direction to form a first polar overwrap, b. wrapping filament material over the first polar overwrap in a cylindrically oriented direction and of sufficient extent to cover the junctions of the cylindrical portion with the dome portions to form a first cylindrical overwrap, and c. wrapping filament material over the first cylindrical overwrap in the polar direction to form a second polar overwrap which holds the cylindrical overwrap against movement relative to the liner.
Claim 3
Dependent Claim
39 words
A method as set forth in claim 1 further including the step of wrapping filament material over the second polar overwrap in the cylindrically oriented direction overlying the cylindrical portion of the liner, thereby forming a second cylindrical overwrap.
Claim 4
Dependent Claim
40 words
A method as set forth in claim 2 wherein the step of forming the second cylindrical overwrap includes the step of terminating the wrapping of the filament material adjacent to the junctions of the cylindrical portion with the dome portions.
Claim 5
Dependent Claim
28 words
A method as set forth in claim 1 wherein said step of forming a liner includes the step of integrally forming the dome and cylindrical portion of aluminum.
Claim 6
Dependent Claim
47 words
A method as set forth in claim 4 wherein said step of overwrapping the liner includes the step of providing filament material made of fiberglass, and further including the step of coating the fiberglass filament material with an epoxy resin prior to wrapping it around the liner.
Claim 7
Dependent Claim
22 words
A method as set forth in claim 5, and further including the step of heat curing the vessel after overwrapping the liner.
Claim 8
Dependent Claim
44 words
A method as set forth in claim 1, and further including the step of pressurizing the vessel beyond the elastic limit of the liner after overwrapping the liner, elastically unloading the liner by reducing the pressure, and compressing the liner with the filament overwrap.
Claim 9
Dependent Claim
25 words
A method as set forth in claim 1 wherein said step of overwrapping the liner includes the step of providing filament material made of graphite.
Claim 10
Dependent Claim
25 words
A method as set forth in claim 1 wherein said step of overwrapping the liner includes the step of providing filament material made of boron.
Claim 11
Dependent Claim
25 words
A method as set forth in claim 1 wherein said step of overwrapping the liner includes the step of providing filament material made of Kevlar.
Claim 12
Independent Claim
137 words
A method of manufacturing a pressure vessel including the steps of forming a tubular blank of aluminum, forming the tubular blank into a liner in the shape of a cylindrical portion having a wall thickness and a dome portion of substantially equal wall thickness at each end thereof, completely overwrapping the liner by winding filament material in alternating polar oriented and cylindrically oriented winding patterns with at least part of a cylindrically wound winding pattern covering the junctions of the cylindrical portion and each dome portion, the filament material having a higher modulus of elasticity than the aluminum liner, pressurizing the vessel above the elastic limit of the metallic liner and then depressurizing the vessel, so that the metal liner unloads elastically, and a compressive stress is thereby applied to the metallic liner by the overwrap filaments.
Claim 13
Independent Claim
137 words
A method of manufacturing a pressure vessel including the steps of forming a tubular blank of aluminum, forming the tubular blank into a liner in the shape of a cylindrical portion having a wall thickness and a dome portion of substantially equal wall thickness at each end thereof, completely overwrapping the liner by winding filament material in alternating polar oriented and cylindrically oriented winding patterns with at least part of a cylindrically wound winding pattern covering the junctions of the cylindrical portion and each dome portion, the filament material having a higher modulus of elasticity than the aluminum liner, pressurizing the vessel above the elastic limit of the metallic liner and then depressurizing the vessel, so that the metal liner unloads elastically, and a compressive stress is thereby applied to the metallic liner by the overwrap filaments.
Claim 14
Independent Claim
137 words
A method of manufacturing a pressure vessel including the steps of forming a tubular blank of metallic material forming the tubular blank into a liner in the shape of a cylindrical portion having a wall thickness and a dome portion of substantially equal wall thickness at an end thereof, completely overwrapping the liner by winding filament material in alternating polar oriented and cylindrically oriented winding patterns with at least part of a cylindrically wound pattern covering the junction of the cylindrical portion with the dome portion, the filament material having a higher modulus of elasticity than the metallic liner, pressurizing the vessel above the elastic limit of the metallic liner and then depressurizing the vessel, so that the metal liner unloads elastically, and a compressive strength is thereby applied to the metallic liner by the overwrapped filaments.
Claim 15
Independent Claim
137 words
A method of manufacturing a pressure vessel including the steps of forming a tubular blank of metallic material forming the tubular blank into a liner in the shape of a cylindrical portion having a wall thickness and a dome portion of substantially equal wall thickness at an end thereof, completely overwrapping the liner by winding filament material in alternating polar oriented and cylindrically oriented winding patterns with at least part of a cylindrically wound pattern covering the junction of the cylindrical portion with the dome portion, the filament material having a higher modulus of elasticity than the metallic liner, pressurizing the vessel above the elastic limit of the metallic liner and then depressurizing the vessel, so that the metal liner unloads elastically, and a compressive strength is thereby applied to the metallic liner by the overwrapped filaments.
Claim 16
Independent Claim
168 words
A method of manufacturing a pressure vessel including the steps of forming a liner in the shape of a cylindrical portion and a dome portion at an end thereof, overwrapping the liner by winding filament material thereabout in the following sequence: a. wrapping filament material about the liner in the polar direction to form a first polar overwrap; b. wrapping filament material over the first polar overwrap in a cylindrically oriented direction and of sufficient extent to cover the junction of the cylindrical portion with the dome portion to form a first cylindrical overwrap; c. wrapping filament material over the first cylinder overwrap in the polar direction to form a second polar overwrap which holds the cylindrical overwrap against movement relative to the liner; d. wrapping filament material over the second polar overwrap in the cylindrically oriented direction overlying the cylindrical portion of the liner and terminating the wrapping of said wrapping of the filament material adjacent to the junction of the cylindrical portion with the dome portion.
Claim 17
Independent Claim
168 words
A method of manufacturing a pressure vessel including the steps of forming a liner in the shape of a cylindrical portion and a dome portion at an end thereof, overwrapping the liner by winding filament material thereabout in the following sequence: a. wrapping filament material about the liner in the polar direction to form a first polar overwrap; b. wrapping filament material over the first polar overwrap in a cylindrically oriented direction and of sufficient extent to cover the junction of the cylindrical portion with the dome portion to form a first cylindrical overwrap; c. wrapping filament material over the first cylinder overwrap in the polar direction to form a second polar overwrap which holds the cylindrical overwrap against movement relative to the liner; d. wrapping filament material over the second polar overwrap in the cylindrically oriented direction overlying the cylindrical portion of the liner and terminating the wrapping of said wrapping of the filament material adjacent to the junction of the cylindrical portion with the dome portion.
Claim 18
Independent Claim
122 words
A method of manufacturing a pressure vessel including the steps of forming a tubular blank of aluminum, forrming the tubular blank into a liner in the shape of a cylindrical portion having a wall thickness and a dome portion of substantially equal wall thickness at at least one end thereof, completely overwrapping the liner by winding filament material with the filament material covering both the cylindrical portion and the dome portion, the filament material having a higher modulus of elasticity than the aluminum liner, pressurizing the vessel above the elastic limit of the metallic liner and then depressurizing the vessel so that the metal liner unloads elastically and a compressive stress is thereby applied to the metallic liner by the overwrapped filaments.
Claim 19
Independent Claim
122 words
A method of manufacturing a pressure vessel including the steps of forming a tubular blank of aluminum, forrming the tubular blank into a liner in the shape of a cylindrical portion having a wall thickness and a dome portion of substantially equal wall thickness at at least one end thereof, completely overwrapping the liner by winding filament material with the filament material covering both the cylindrical portion and the dome portion, the filament material having a higher modulus of elasticity than the aluminum liner, pressurizing the vessel above the elastic limit of the metallic liner and then depressurizing the vessel so that the metal liner unloads elastically and a compressive stress is thereby applied to the metallic liner by the overwrapped filaments.
References Cited (Backward Citations)
US2030818A
Cited
US2227817A
Cited
US2858992A
Cited
US3023495A
Cited
US3411727A
Cited
US3448253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |