Pipes and tubular conduits – Flexible – Spirally wound material
Patent
1980-12-01
1984-02-14
Stodola, Daniel P.
Pipes and tubular conduits
Flexible
Spirally wound material
138132, 138174, F16L 1108
Patent
active
044310340
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to flexible tubing and particularly to the construction of a hose, and may be used to best advantage for operation under the conditions of high internal pressure and axial tensions in the petroleum, gas, petroleum-processing, chemical, and coal industries.
BACKGROUND ART
The exploitation of oil and gas wells constructions of hoses capable of operation under the conditions of high internal pressures and axial tensions. However, the existing hoses which provide for operation under the above conditions fail to offer adequate flexibility, which greatly complicates their use and transportation. On the other hand the conventional hoses which offer an adequate flexibility are incapable of operation under high axial tensions; this restricts the use of such hoses, for example rendering them completely unfit for lowering into a well or mine.
The problem of providing a flexible hose capable of operation under high internal pressures and axial tensions arose relatively long ago, but still remains to be adequately solved.
There is known in the art a hose disclosed in U.S. Pat. No. 3,715,454. The hose comprises an internal supporting portion in the form of spaced tubular members interconnected by convolutions which are integral with the tubular members and extend radially outwardly from the latter. The convolutions have aligned recesses which define at least one groove extending the full length of the hose, each groove accommodating a reinforcing thread secured to the hose over the entire length thereof.
The hose of the above-described construction may be, depending on the amount of the reinforcing threads, employed for operation either under the action of only an internal pressure or under a simultaneous action of both an internal pressure and an axial tension. In the latter case, an additional amount of the threads is provided to counterbalance the external axial tensile forces. However, increasing the amount of the threads considerably lowers the flexibility of the hose. Thus, the above-described hose reinforced in the axial direction will be capable of operation under a simultaneous action of a high internal pressure and high axial tensile forces, offering low volume, axial, and radial deformations, and a fair durability, but at the same time will have a high specific weight, will be difficult to manufacture and costly.
When adequately reinforced in the axial direction, the hose will have but a very low flexibility. Moreover, it will be incapable for operation in a bent state, since in this case the equality of loading of the reinforcing threads will be upset and thereby the carrying capacity of the construction as a whole will be lowered. The above disadvantages considerably restrict the scope of application of this known.
Another hose construction has been proposed in the French Pat. No. 2,142,764. This hose comprises an inner supporting tube of an elastic material and an outer protective cover, between which reinforcing plies are arranged. Each of the reinforcing plies has the form of a helically wrapped metallic braid, the wrapping angle with respect to the geometrical axis of the hose varying in accordance with a certain relationship from the innermost reinforcing ply to the outermost one within the range of 80.degree. to 6.degree..
The above-described hose features an adequate flexibility and is capable of withstanding the internal pressure. However, due to the high axial and volume deformations arising in operation, especially with a pulsating internal pressure, the threads of the reinforcing ply braids rub through due to their displacements with respect to one another, which greately impairs the durability of the hose. In addition, a hose of such a construction is incapable of operation under an axial tension.
There is also known in the art a hose disclosed in British Pat. No. 1,334,025. The hose comprises an inner supporting tube of an elastic material and an outer protective cover, between which reinforcing plies are arranged. Each of the reinforcing plies
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Abdullaev Gasan M. B. O.
Aliev Gabil G.
Gadzhiev Yashar A. O.
Gasanov Ilgam A. O.
Ismailov Tofik K. O.
Adams Bruce L.
Burns Robert E.
Institut Matematiki I Mekhaniki
Lobato Emmanuel J.
Stodola Daniel P.
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