According to various embodiments, there is provided a marked conduit or tube including: a hollow body having an outer surface, a length dimension, and a plurality of markings along the length dimension, the plurality of markings including a first line marking, where the first line marking is positioned at a 0-degree point of a cross-sectional view of the hollow body, a second line marking where the second line marking is positioned at a 90-degree point relative to the 0-degree point of the cross-sectional view of the hollow body, a third line marking, where the third line marking is positioned at a 180-degree point relative to the 0-degree point of the cross-sectional view of the hollow body, and a fourth line marking, where the fourth line marking is positioned at a 270-degree point relative to the 0-degree point of the cross-sectional view of the hollow body.

A compressive heat-resistant tube structure for RV includes a compressive heat-resistant multi-layer tube. The compressive heat-resistant multi-layer tube includes a compressive heat-resistant PVC soft inner tube, a polyester dense crocheted covering layer, and a compressive PVC soft outer tube. An outer surface of the compressive PVC soft outer tube is provided with an identification surface layer portion. The identification surface layer portion enables the user to easily and quickly identify each tube for connection of tubes. The soft compressive heat-resistant multi-layer tube can be bent according to the demand of use, not limited to the arrangement of the edge wiring. The soft compressive heat-resistant multi-layer tube is convenient for use and can be installed conveniently.

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.

A compressive heat-resistant tube structure for RV includes a compressive heat-resistant multi-layer tube. The compressive heat-resistant multi-layer tube includes a compressive heat-resistant PVC soft inner tube, a polyester dense crocheted covering layer, and a compressive PVC soft outer tube. An outer surface of the compressive PVC soft outer tube is provided with an identification surface layer portion. The identification surface layer portion enables the user to easily and quickly identify each tube for connection of tubes. The soft compressive heat-resistant multi-layer tube can be bent according to the demand of use, not limited to the arrangement of the edge wiring. The soft compressive heat-resistant multi-layer tube is convenient for use and can be installed conveniently.

A composite hose assembly including a fluoropolymer inner tube and a jacket circumferentially surrounding the fluropolymer tube. The jacket is formed from a plurality of plaits of fiberglass lace or other material. The jacket is then coated or infused with different resins along an axial length of the tube to impart varying degrees of flexibility along its length. A method of making the composite hose assembly includes: providing a fluropolymer inner tube, forming a jacket by circumferentially wrapping a plurality of plaits of fiberglass lace or other material around the fluropolymer tube, and infusing the plaits with different resins along its length to vary the flexibility.

An identifier for a conduit includes a substrate having a pair of apertures. The substrate further contains a frangible portion encompassing one of the apertures and having a shape that corresponds to an opening left in the substrate after removal of the frangible portion. The identifier enables the shape of the frangible portion to be correlated with the shape of the opening left in the substrate after the frangible portion is separated from the substrate.

The provided is a hose with an indicator (30), comprising: a hose body (30a) made of rubber that forms a fluid flow path therein; a fitting (30b) made of metal connected to an end of the hose body; and an indicator (31) in which color components are extracted by a deterioration state determination device provided with a deterioration determination model and a color change database in order to determine deterioration state of the hose body, wherein a first indicator (31a) is attached to an external surface of the hose body, a second indicator (31b) is attached to an external surface of the fitting, and the color component extracted from the first indicator is compared with the color component of the second indicator in determining deterioration state of the hose body.

A flexible hose for the transportation of liquids or fluids comprising at least one layer (10) with an exposed surface (11) made of a first polymeric material, the at least one layer (10) having at least one QR code (40) according to the ISO/IEC 18004:2000(E) standard. The at least one QR code (40) includes at least one ink layer (41) printed on at least one portion (12) of the exposed surface (11) of the hose, the ink being compatible with the first polymeric material.

A visibility-enhanced corrugated structure is provided. The structure includes a base tube having an internal passage that slideably receives an inner element such as a hose, cable or fluid. A rub strip is provided on crests of the corrugated structure to mitigate abrasion wear of structures located beneath the crests. One or more visibility strips are provided within the corrugations in a flank or root region, thus protecting the visibility strip from wear. Suitable visibility strips may be reflective or phosphorescent.