Pipes and tubular conduits – Flexible – Spirally wound material
Patent
1987-11-25
1989-08-29
Bryant, III, James E.
Pipes and tubular conduits
Flexible
Spirally wound material
138130, 138174, F16L 1108
Patent
active
048607983
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a flexible hose reinforced by wire plies, wherein at least two wire plies are provided and the reinforcing wires of each ply are disposed in helical convolutions about the longitudinal axis of the hose. Furthermore, the hose is provided with at least one inner and outer layer each pressure-tight, as well as with connecting elements at the ends.
STATE OF THE ART
As it is known, such reinforced flexible hoses have to cope with ever increasing requirements. Nowadays, in the oil industry liquid-bearing hoses with internal diameters of 50 to 100 and more millimeters are needed which have an operating pressure of more than 1,000 bar and they have to withstand a burst pressure of around 3,000 bar. Additionally, an increased form stability is also required, in the sence that the hoses should not deform longitudinally or torsionally. But, at the same time, they should have the smallest possible bending stiffness.
Conventional reinforced flexible hoses are unsuitable for fulfilling these requirements simultaneously. With known hoses, the flexibility of the hoses can be provided and the strength of the hoses is satisfactory but they are not flexible strength, neither with pressures being considerably smaller than 3000 bar.
In the field of the reinforced hoses, a so called equilibrium angle of lay 35.degree. 26' is conventionally used. (Angle of lay is defined in the following manner: the angle of lay is zero if the reinforcing wire is perpendicular to hose axis, and the angle of lay is 90.degree. if the wire is parallel to the hose axis.) In this case, the load bearing of the wire plies being arranged one on the other greatly decreases outwardly and, on the impact of inner pressure, the hoses also deform torsionally.
In some cases, it has been suggested to improve the torsional stability and the uniform load bearing of the plies by deviating from the conventional angle of lay of 35.degree. 16' and by decreasing the angles of lay of the inner wire plies, and to increase the angles of lay for the outer wire plies. With this, the load was thought to be devided into two, the radial loads were intented to be carried by the wire plies being closer to the center of the hose and the axial loads by the ones being farther from it. Such expedients, however, failed to ensure the required flexibility, and the bending stiffness of these hoses was the multiple of that of the hoses with conventional equilibrium, angles of lay, the reason for the latter being in the great angle of lay of the outer wire plies.
This kind of wire reinforced hose is described in SU-PS 941 867 wherein the angle of lay of the two inner wire plies is between 0 and 15 degrees and that of the outer pair of wire plies between 70 and 90 degrees. As it has been shown, the strength utilization of these hoses is not sufficient against inner pressure since the stress in the outer plies is the half of that in the inner plies and the two simmetrically arranged lower plies having the same angle of lay are not loaded uniformly. Followingly, the strength utilization is in the best case only 70 to 75 percent.
Numerous proposals have been suggested to lessen the drawbacks of this construction, and in SU-PS 949 282, 949 283, 949 284 nd 960 483, reinforcing elements are described having various profiles. It has also been suggested to employ a further pair of wire plies with an angles of lay between 30 and 60 degrees. In SU-PS 994 853, a hose with more than two pairs, i.e. more than four wire plies is used and the angles of lay of the wire plies are between 0 and 15 or 70 and 90 degrees. With this, the pressure bearing of the hoses can be enlarged to a certain extent in relation to the original construction but the bending stiffness could not be made less.
In GB-PS 953 833, a reinforced hoses having a similar construction as mentioned above is described. The inner pressure is carried by a pair of wire plies having the same angle of lay and the axial tension is carried by a pair of wire plies with an angle of lay between 55
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Antal Sandor
Gyongyosi Gyorgy
Kovacs Ferenc
Lengyel Miklosne
Nagy Tibor
Bryant III James E.
Taurus Gumiipari Vallalat
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