Contitech USA, Inc.

Phoenix Rubber Gumiipari Kft.

Contitech Rubber Industrial Gumiipari Kft.

Jeno Kotai

Tibor Nagy

Istvan Grepaly

Imre Domonkos

Gyula Beteri

Jozsef Kiraly

Laszlo Nacsa

Gergely Szekely

Tamas Mezo

Zsolt Kovacs

A rubber hose includes a distinctly colored inner wear indicator integrated into its liner, wherein a distance b of the inner wear indicator from the inner surface of the liner is less than 40% of the liner's thickness v, and height h of the wear indicator, measured perpendicularly to a longitudinal axis of the hose, falls between 1% to 90% of liner thickness v, or even from 10% to 40% of the liner thickness v. The inner wear indicator may have concentric sectional surface area of the inner wear indicator may even gradually decrease in the radial direction as a function of distance from the longitudinal axis. The rubber hose may be connected at one end to a plunger pump and connected at a second to a common manifold, in an oilfield pump system, or used in any hose application in an oilfield fluid pump system.

Early life erosion tracking layer for high pressure fracking hoses

The invention relates to a bonded high-pressure rubber hose comprising a flexible internal stripwound tube (), a liquid and gas tight liner () made from rubber or plastic, reinforcing plies embedded in rubber, and in specific cases an adhesively bonded coupling body (), the lower reinforcing ply or plies being disposed at an angle smaller than the so-called angle of equilibrium (35.26&#xb0;). The invention is characterized by that in addition to the primary liner the hose () comprises a liquid and gas tight secondary liner () disposed above the small angle reinforcing ply or plies (), and that the following inequality holds for the angle of lay of the lowest reinforcing ply () of the hose: &#x2022;where &#x2022;ais the angle of lay of the lowest small angle reinforcing ply () &#x2022;D s is the outside diameter of the internal stripwound tube () &#x2022;Dis the mean diameter of the lowest small angle reinforcing ply ().

Bonded high-pressure rubber hose, particularly for conveying gaseous media

A rubber hose provided with an outer metal armouring and a vulcanised and/or adhesively bonded coupling, in particular a flexible rubber hose provided with reinforcing plies, wherein the armouring is constituted by a flexible metal stripwound metalpipe with an interlocked profile ( ) which is spliced at least from tow sections and fits with a minimal gap on the hose below.

Rubber hose with outer armouring and process of producing the same

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Szeged, Hungary

Jeno Kotai