US3687169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible pipe for conveying fluids, particularly hydrocarbons
Assignee: IFP Energies nouvelles
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Filing: 1970-07-16
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Granted: 1972-08-29
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Expires: 1990-07-16
Abstract
Abstract A flexible pipe for conveying diphasic fluids under pressure which includes a flexible tubular core of an elastomeric or plastic material, an inner reinforcing means which resists compression and is in contact with the internal wall of the tubular core and an external clamping means enclosing the tubular core. The internal reinforcing means and external clamping means subject the core to a compression not less than 50 kg/cm2 and at least equal to the maximum internal pressure of the fluid conveyed in the pipe. The internal reinforcement means is preferably a helical winding of a metallic band or strip which is adapted to withstand compression. The external clamping means is, preferably, a metallic wire, strand, band or cable helically wound around the core.
Inventors
- 👤 Remi Reynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:44
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/14; F16L11/16; F16L11/04; F16L11/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
158 words
A flexible pipe effective for conveying diphasic fluids under pressure which comprises a tubular core of flexible material, an internal compression-resisting reinforcement means in contact with the internal wall of said tubular core, an external clamping means surrounding said tubular core, said external clamping means maintaining said core in a state of compression against said internal reinforcement means, and said internal reinforcement means and said external clamping means each forming a substantially continuous contact surface with said tubular core, the value of the compression of the core being not less than 50 kg/cm2 and at least equal to the maximum internal pressure of the fluid being conveyed in the pipe, the state of compression of the tubular core and the contact of the internal compressionresisting reinforcement means and the external clamping means with the core being sufficient to provide a pipe which is resistant to corrosive action in the conveyance of diphasic fluids under high pressure and temperature.
Claim 2
Dependent Claim
158 words
A flexible pipe effective for conveying diphasic fluids under pressure which comprises a tubular core of flexible material, an internal compression-resisting reinforcement means in contact with the internal wall of said tubular core, an external clamping means surrounding said tubular core, said external clamping means maintaining said core in a state of compression against said internal reinforcement means, and said internal reinforcement means and said external clamping means each forming a substantially continuous contact surface with said tubular core, the value of the compression of the core being not less than 50 kg/cm2 and at least equal to the maximum internal pressure of the fluid being conveyed in the pipe, the state of compression of the tubular core and the contact of the internal compressionresisting reinforcement means and the external clamping means with the core being sufficient to provide a pipe which is resistant to corrosive action in the conveyance of diphasic fluids under high pressure and temperature.
Claim 3
Dependent Claim
21 words
The flexible pipe of claim 1, wherein the clamping means comprises an elongated element helically wound along a small pitch angle.
Claim 4
Dependent Claim
66 words
The flexible pipe of claim 2, wherein the helical winding of the element constituting the clamping means has a pitch angle tan Alpha (d + e)/( pi D), wherein D the outer diameter of the tubular core, d the width of the element constituting the clamping means, and e the spacing between adjacent turns of the clamping means, D, d and e having the same units.
Claim 5
Dependent Claim
43 words
The flexible pipe of claim 1, wherein at least one of the internal reinforcement means and the external clamping means is composed of a band helically wound with a spacing between the adjacent turns of the winding being less than about five-tenths mm.
Claim 6
Dependent Claim
22 words
The flexible pipe of claim 4, wherein the spacing between the adjacent turns of the winding is less than about three-tenths mm.
Claim 7
Dependent Claim
39 words
The flexible pipe of claim 1, wherein at least one of the internal reinforcement means and the external clamping means is composed of a band helically wound in such a manner that the successive turns of the bands overlap.
Claim 8
Dependent Claim
45 words
The flexible pipe of claim 1, wherein at least one of the internal reinforcement means and the external clamping means is composed of a band helically wound in such a manner that the successive turns of the bands are interconnected with respect to each other.
Claim 9
Dependent Claim
31 words
The flexible pipe of claim 1, wherein the external clamping means is composed of a wire wound with a spacing between adjacent turns of the winding less than about five-tenths mm.
Claim 10
Dependent Claim
32 words
The flexible pipe of claim 1, wherein the external clamping means is composed of a cable wound with a spacing between adjacent turns of the winding being less than about five-tenths mm.
Claim 11
Dependent Claim
22 words
The flexible pipe of claim 1, wherein at least one of the internal reinforcement means and the external clamping means is metallic.
Claim 12
Dependent Claim
31 words
The flexible pipe of claim 1, wherein at least one of the internal reinforcement means and the external clamping means is made of a metal and coated with a synthetic resin.
Claim 13
Dependent Claim
30 words
The flexible pipe of claim 1, wherein at lEast one of the internal reinforcement means and the external clamping means is made of a metal and coated with an elastomer.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |