Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1998-03-30
2000-08-08
Krynski, William
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428 358, 428 361, 428 362, 428 3691, 138124, 138125, 138129, 138172, B32B 108
Patent
active
06099925&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a flexible pipe or duct having a textile reinforcement and, more particularly, to a flexible pipe for conveying a fluid under high pressure, the inside diameter of the said pipe being greater than approximately 4 cm.
Such pipes are used, for example, for conveying gas, crude oil, water or other fluids over long distances and under pressures of several hundred bars.
The structure of these pipes, in its simplest form, comprises at least: function of which is to resist the pressure prevailing inside the inner tube and the various external forces, arranged around the reinforcement.
The improvements and other refinements made to the pipes of this type relate generally, but not exclusively, to the reinforcement.
RELATED ART
In a known embodiment, the reinforcement is produced by plaiting filamentary slivers around an inner leakproofing tube made of synthetic material. Such a reinforcing technique has disadvantages, in particular that of limiting the inside diameter of the inner leakproofing tube to values below 4 cm, which considerably restricts the use of the flexible pipe. In fact, beyond 4 cm, the means to be employed for producing the appropriate plaits are prohibitive, since they involve a great number of large reels of filamentary slivers and handling members which are considerable in view of the weight of the reels. With the means currently available, it is very difficult, if not impossible, to produce a closely packed reinforcement which covers the inner leakproofing tube perfectly over very great lengths (for example, greater than 1 km for an inside diameter of 5 cm). Now a closely packed reinforcement or a complete covering of the inner tube is necessary in order to achieve a high resistance of the flexible pipe. It is preferred to have a closely packed reinforcement or a good covering rate of the inner tube, hence resistance to internal pressure, the only solution is to reduce the length of the pipes obtained continuously. The result of this is that, in order to convey fluids over long distances, it becomes necessary to connect a plurality of pipes end to end by means of connection pieces, the disadvantage of this being that it involves a high outlay and gives rise to zones of weakness in the pipe in term of leakproofing.
Moreover, carrying out very closely packed plaiting slows down the pipe production rates appreciably.
Finally, plaiting of filamentary slivers involves a great number of interlacings of the filamentary slivers, the result of which is a low output which is reduced all the more because the number of superposed plaited layers is high since it was noticed that the layers furthest away from the (central) longitudinal axis of the inner tube contributed less than the others to the resistance to the pressure exerted on the inner wall of the inner tube.
In another embodiment, the reinforcement consists of one or more pairs of crossed laps, each lap being produced by means of a spiral winding of large slivers, such as cords or strands of substantially circular cross-section, the turns being more or less contiguous. The disadvantage of this technique is that it gives rise to a phenomenon of rotation of the inner tube when it is under pressure, the reinforcing slivers having unequal elongations from one lap to the other. Now such a phenomenon may damage the inner tube and reduce the effectiveness of the flexible pipe.
The U.S. Pat. No. 4,104,095 describes a flexible pipe having an internal plastic tube on which is wound a tape made of glass web the assembly being then heated in order that an intimate bond between the plastic sheath and the glass web is made by superficial melting of the sheath and displacement into the free spaces of the glass web, whereby a called "bonded" pipe is obtained.
The patent EP 539 429 relates to a composite pipe, in which a fluid under high pressure can circulate. The pipe comprises an inner tube made of thermoplastic, one or more layer of a band-like material wound around an inner tube, and an outer protect
REFERENCES:
patent: 4104095 (1978-08-01), Shaw
Do Anh Tuan
Le Nouveau Joel
Coflexip
Cronin Chris
Krynski William
LandOfFree
Flexible duct with a textile reinforcement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flexible duct with a textile reinforcement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flexible duct with a textile reinforcement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1148087