Abstract: A device for the electric measurement of the level of a liquid in a container has a protective tube (1) within which a conductive foil (10) is arranged twisted. The protective tube is a corrugated tube with corrugations (2, 3). These corrugations (2, 3) have interruptions (4, 5, 7, 8). The interruptions lie along two helical lines (6, 8). The conductive foil (10) is pushed with its longitudinal edges (11, 12) into these interruptions (4, 5) which lie on two helical lines (6, 9). In order to permit of easy bending of the entire device, the conductive foil (10) has incisions (13, 14) which extend from both longitudinal edges (11, 12) up to the center of the conductive foil (10).

Abstract: A conduit tube of an electrode device for electrically heating underground hydrocarbon resources, which comprises: a metal conduit tube and an electrically insulative covering adhered on and around the outer peripheral surface of said metal conduit tube, said electrically insulative covering being formed by adhering polyether/ether/ketone resin in powder form having particle size of a range of from 10 to 100 .mu.m on and around said metal conduit tube which has been preheated to a temperature range of from 350.degree. C. to 450.degree. C. by the electrostatic coating method, and fusion-bonding the electrically insulative covering material thereon at said temperature range of the preheating.

Abstract: A flexible control line for communication in a well bore is disclosed having a communication tube and a strength member extending along the tube. The tube and strength member are encapsulated in a sheath of elastomeric material. Sealing means are provided for the strength member to prevent fluid or gas migration to the surface through the strength member from a subsurface source.

Abstract: In a device for the electric measurement of the level of a liquid in a container, particularly in the gasoline tank of a vehicle, a support developed as protective tube of a conductor foil is fastened for swinging against the force of a spring (14 and 21) to the top of the container. In order to be able to arrange the support even in containers in which the point of attachment of the support is lower than the highest level to be detected, the support is subdivided into three approximately rigid sections, (2, 3, 5) each two sections (3, 5) being articulated in the manner of a toggle joint to each other and being under spring action. In this way the outermost section (3) is swung, substantially independently of the inside height of the container, on the one end towards the bottom (4) and on the other end towards the top (1) of the container.

Abstract: One or more electric conductors (36, 236) in a flexible hose (10, 210) are protected from tensile and compressive forces exerted on or by the hose by providing an enclosure (32, 232) for the conductor(s) whose radial dimension (46, 246) provides a path for movement of the conductor(s) that is greater than any movement thereon exerted on or by the hose which might otherwise harm or break the conductor(s).

Abstract: A device for the electric measurement of the level of a liquid within a container has a protective tube (1) within which a conductive foil (2) is helically arranged. The conductive foil (2) is wound with such a pitch that sufficient space remains between its longitudinal edges (3, 3') to provide a helically extending flexible protective-tube region (16, 16') within the protective tube (1). This protective-tube region has inwardly and outwardly directed U-shaped tube sections (17, 18, 19). As a result of this development the protective tube (1) bends exclusively in those regions which are located between the longitudinal edges (3) of the conductive foil (2).

Abstract: A long, continuous, constant diameter, neutrally buoyant oil filled line array hose without couplings comprising a plastic inner hose having a layer of conducting and/or optical fibers wrapped helically around and bonded to the outer periphery along the neutral axis thereof. A strength member layer is encased within and bonded to an outer plastic sleeve which covers the conducting layer. Sensors are placed within the inner hose cavity through incisions formed at predetermined locations, attached to the conducting layer, and sensor-conductor junctions are sealed with a waterproof coating; the incisions are then chemically sealed. The hose cavity is filled with an insulating oil providing a continuous, oil filled constant diameter, line array hose devoid of coupling members.

Abstract: A flexible heated hose for transporting molten adhesive from a melter to a dispenser. The hose comprises a Teflon tube contained within stainless steel braided wire and fitted with conventional hydraulic fittings at each end. The braided tube is encased within a multiple ply covering which includes a first layer of fiberglass tape around which are wound electrical resistance heating wires, a resistance temperature detector, electrical leads including a ground wire, and two plies of helically wound fiberglass tape, with a layer of helically wound Aramid fiber, two layers of helically wound polyester felt, and a layer of helically wound vinyl tape covering the same. The heating wires, electrical leads, and temperature detector are adhesively secured to the first layer of fiberglass tape which is in turn adhesively secured to the stainless steel braided wire covering the Teflon tube. In a modified embodiment, the ground wire is wound separate from the other electrical leads.

Abstract: A control line protector clamp having an elastic inner wall with longitudinal slots therein to accommodate and secure control lines comprising a pair of rubber-coated, semicylindrical, skeletal steel frame members hinged together along one of their longitudinal edges and adapted to be releasably closed securely into a generally cylindrical configuration by drive pin fastener means at their opposite longitudinal edges, the frame members each being of lateral, parallel, rib-and-slot construction with a reinforced, generally rectangular, three-walled, longitudinal channel formed in the member with the open side of the channel facing inwardly of the frame and encompassing the slots and with braces spanning the angles formed between the side walls of the channel and the circumference line of the frame members.

Abstract: An improved double wall hose and the method of forming the hose characterized by the hose comprising a helically wound member having a center part with extensions extending in opposite directions so that when adjacent turns of the member are joined together, a plurality of cavities are formed with one of the cavities containing a helical reinforcing member. Preferably, the reinforcement is of a material harder than the material forming the rest of the member and the turns of the member when joined together provide smooth continuous inner and outer wall surfaces for the hose.

Abstract: An armored umbilical and termination housing is disclosed for towing a sub-array of seismic air guns used in marine seismic surveying comprising a single air hose for supplying all the high pressure air to the individual air guns surrounded by all the electrical control cables needed to operate the air guns in the sub-array. Protective coatings are applied around the electrical control cables and stress members for carrying the laod of towing the sub-array are incorporated within the umbilical. A termination housing is provided on the end of the umbilical for terminating the single air hose and all the electrical control lines to common connectors so that individual electrical control lines and air hoses can run from the termination housing to each individual air gun in the sub-array. Air shut off valves are provided so that the high pressure air can be shut off to the individual air guns within the sub-array remotely from the survey vessel.

Abstract: A supplementary hose attached to a main vacuum cleaner hose for carrying an electrical line is seated in a groove formed in the outside surface of the main vacuum cleaner hose. To increase the flexibility of the vacuum cleaner hose in all directions, the wall of the supplementary hose is perforated.

Abstract: In an air duct assembly, the air duct is integrally provided with a harness sheath which is formed with a laterally openable, longitudinal slit adapted to permit the harness to be inserted in the sheath and retained therein. The harness sheath may be molded, integrally with the air duct, of a polyethylene resin by blow-molding, for example. The air duct is a defroster duct which extends transversely across the passenger comparment of an automobile.

Abstract: Pipe coating having a thermal insulating layer of polymeric material and an outer barrier layer is provided with an additional electro-conductive layer intermediate between the two layers to facilitate testing of the latter for discontinuities by conventional electric testing equipment for detecting discontinuities in the outer barrier layer, e.g. by measuring electrical conductivity or resistivity along the face of the barrier layer.

Abstract: A multiple fluid conveying hose assembly comprising a principal vacuum conveying hose for a vacuum cleaning system, and a smaller diameter liquid conveying hose passing through its interior. A molded end connector on the principal hose provides an outlet for the smaller hose and serves to separate the ends of the two hoses for use. Alternatively, the hose may utilize reinforcing wire coils which also serve as electrical conductors.

Abstract: A side-entry sub for use in conjunction with wireline cable. The sub has a cable entry port provided with a self-closing valve for sealing the port upon withdrawal of the cable. In one embodiment, the self-closing valve is characterized by a housing member supporting a closure disc which is integrally molded with a resiliently deflectable support member having an elastic memory which biases the valve in the closed position. In an alternate embodiment, the self-closing valve comprises a ball valve, biased in the closed position by magnetic or spring means, and having a passageway through which the cable may pass. When the cable is inserted through the passageway, the ball valve is held in the valve open position. When the cable is removed from the passageway, the ball valve automatically closes.

Abstract: To provide a jacket for electrical welding cables with good torsional and bending flexibility as well as form strength at high internal pressures, a surrounding reinforcement layer of conventional warp-knit type is vulcanized into the rubber jacket. In the radial direction outside this reinforcement layer, at least one unidirectionally helically wound reinforcing card is vulcanized into the rubber jacket, the spacing between adjacent cord windings measuring in the longitudinal direction of the jacket about 2-8 mm, preferably about 4 mm.

Abstract: An improved wand for connecting a vacuum cleaner and power nozzle is disclosed. The wand includes a sheath, an upper wand assembly received in the sheath and detachably connected to the vacuum cleaner hose handle, and a lower wand assembly received in the sheath and releasably connected therein to the upper wand assembly. A resilient plug body is provided for attachment to the hose handle to be connected to the cord of the sheath. The plug body contains at least two electrical connectors separated by a slit to provide a limited degree of flexibility in the plug body to insure a good connection despite any possible minor misaligment with the opposing connectors on the cord. The upper end of the lower wand assembly has a leaf spring with a button on its underside protruding through a hole in the lower wand assembly to engage a similar hole in the upper wand assembly.

Abstract: A helically fabricated electrically conductive flexible hose having a self-supporting electrically conductive helical reinforcing element of non-circular cross-section with a flat side facing inwardly and defining the outermost element of the hose bonded to a flexible plastic hose wall.

Abstract: A one-piece wire guard device formed of non-metallic material for use in wells includes an inner ring having a split therein defining an opening and having a portion of reduced thickness defining a hinge. Arcuate sections are disposed concentrically outwardly of the inner ring and are connected to the latter by ribs. The ribs, arcuate sections and inner ring cooperate with each other to define openings for accommodating electric wires, ropes and the like therethrough. A guard device may be flexed about its hinge from a normally closed condition to an open position to permit a drop pipe to be inserted through the opening defined by the split. Releasably locking means lock the guard device upon the drop pipe. Spacer tabs extend outwardly from the arcuate sections and engage a well casing to space the drop pipe from the casing and thereby prevent damage to the drop pipe, electrical wires, safety ropes and the like extending through the guard device.

Abstract: A spacer for use in a deep well that is to have a submersible pump situated downhole and with a string of tubing attached to the pump for delivering the pumped fluid. The pump is electrically driven, and power is supplied via an armored cable which parallels the string of tubing. Spacers are clamped to the cable and have the tubing running through an eccentrically located passage in each spacer. The outside dimensions of a spacer fit freely inside any casing in the well.

Abstract: A vacuum cleaning tool adapter for vacuum cleaning systems having a control device incorporated within the adapter. The control device includes an electrical switch and may also include other circuit control devices. Also incorporated in the adapter is a connect-disconnect connector for mechanically interengaging the adapter with a hose assembly leading to the vacuum cleaner, which also provides electrical continuity from the adapter through current conducting reinforcing members in the hose assembly and into the vacuum cleaner. The adapter provides for electrically connecting the cleaning tool into the system, and the switch is used to turn the power on and off from the vacuum cleaner motor to the cleaning tool. An additional switch may also be located in the adapter for controlling the vacuum cleaner motor itself.

Abstract: A separable junction for an electric pipeline system of the type including a tracer for skin-effect heating, which tracer comprises an insulated conductor within an electrically conductive conduit, incorporates flanges at the ends of the pipe section to be joined and the pipes are joined by securing bolts through holes in the flanges. Each end of the tracer conduit on each of the sections of pipe is terminated at and electrically connected to a metallic junction box adjacent to a flange and the tracer conductor thereof extends into the box. Each box has an opening aligned with one of the flange holes for the fastening bolts, but when the junction is assembled, the flange bolt which would be in alignment with the junction box opening is replaced with a hollow, threaded metallic nipple which is dimensioned to fit freely through the bolt holes in the flanges and is long enough to extend between and into the openings of the junction boxes at either side of the junction and electrically connect the boxes.

Abstract: An elongate article, such as a pump power cable, is secured to a flexible hose, for example a layflat well riser hose, by providing the hose with integral support means such as a longitudinally extending rib and providing tie means to extend from the support means around at least part of the periphery of the hose to support the elongate article relative to the hose at a position which is remote from the support means. Preferably the elongate article is secured to the hose by a spaced series of tie means each arranged to encircle individually the hose and elongate article in a figure 8 configuration, with the elongate article lying diametrically opposite the support means.

Abstract: A hose construction and method of making same are provided wherein such hose construction comprises a flexible corrugated hose made of polymeric material, a pair of hose connectors fixed to opposite ends of the hose, and a sleeve disposed around the hose and having opposite end portions wherein the sleeve is fastened to the hose only at its opposite end portions and the sleeve serves to improve the fluid pressure resistance and external wear resistance of the hose while keeping its flexibility substantially intact.

Abstract: A flexible electrically heated hose for transporting molten adhesive from a melter to a dispenser. The hose comprises a Teflon tube contained within stainless steel braided wire and fitted with conventional hydraulic fittings at each end. The braided tube is encased within a multiple ply covering which includes electrical resistance heating wires and a resistance temperature detector adhered between two plies of helically wound fiberglass tape. This tape is covered by multiple plies of helically wound, double thickness fiberglass paper between the plies of which there are embedded spiral wound electrical leads to the dispenser. The fiberglass paper layer is encased within two layers of helically wound polyester felt, a layer of helically wound vinyl tape, and a braided polyester cover. Hard molded plastic cuffs are attached to the ends of the hose. The electrical leads to the heating wires, temperature detector and dispenser extend radially from the hose through holes in the cuffs.

Abstract: A hot melt hose has multiple electrically heated hose sections physically and electrically interconnected end-to-end between a pressurized hot melt source and hot melt dispenser, such as a hand-held gun having a trigger-controlled valve for regulating the flow of hot melt from the gun. Each of the hose sections includes an inner, fluid impervious, chemically inert tube, preferably fabricated of tetrafuoroethlene; an electrically conductive multi-strand braided resistance heating sheath snugly embracing the exterior surface of the inner tube and in intimate heat transfer contact therewith for supplying strength and heat to the tube; and an outer sheath of thermal insulating material for minimizing heat loss. The hose sections are interconnected by a heated joint which comprises electrically conductive hose end fittings electrically connected to the braided sheath and connected by threaded swivel nuts to an electrical insulating fitting.

Abstract: An improved power cable for a heating system that utilizes the skin effect of alternating current, and a method and apparatus for joining lengths of the improved cable. Lengths of the improved cable are joined by first removing predetermined portions of the insulating and semiconductor layers from a terminal end (50) and a feed end (52) of respective cable lengths. The exposed conductors (30') are mechanically joined and covered by a spirally wrapped carbonized TFE tape (60). An insulating layer (62) is formed over the junction by spirally wrapping uncured, nonadhesive tetrafluoroethylene tape with a 50% overlap and then heat fusing the layer. Shield extensions (66), (68) are formed by spirally wrapped, carbonized TFE tape that extend into noncommunicating, isolated overlapped relationship from the respective shield layers (38) of each cable end. The entire splice is covered with a layer of insulation (73) formed by uncured, nonadhesive TFE tape which is subsequently heat fused.

Abstract: A bifilar resistance element for use in preparing heating elements used in thermal bonding and the like, wherein two electrically conducting wires are embedded in a thermoplastic sheath which is fusible when sufficient current is passed through the bifilar resistance element. A heating element is prepared by joining the pair of wires in a length of the bifilar resistance element together at one end to form an electrically conductive path and then winding the length into a spiral shape. Two articles of thermoplastic material may be bonded together by placing the heating element in a recess simultaneously adjacent both articles with a pair of leads to the heating element extending externally from the two articles to be bonded, and applying an electrical current so that the thermoplastic sheath and a portion of the adjacent articles themselves are fused, to bond the articles together upon cooling.

Abstract: A ground clamp for making an electrical connection between a wire and a metal pipe. A metal saddle having a central plate, opposed down turned sides defining a pipe engaging channel, and opposed up turned ends with openings for receiving a wire, with the ends having fingers projecting toward each other defining a band space between the fingers and the plate, with a ground wire passing through the band space and the openings and with a pipe band passing through the space between the fingers and the wire, with means for drawing the ends of the band together to clamp the wire in the saddle and clamp the wire and saddle onto the pipe.

Abstract: A controllable stiffness duct having a spirally wound metallic strip with a spiral turns interlock to define a flexible product carrying or delivering conduit. Disposed in the spiral turns interlock is a pressure line inflatable to stiffen the conduit and resist collapse. The pressure line may be used to convey fluid through the duct to power a device at a remote end of the duct. The pressure line may include imbedded electrically conductive materials to provide electrical power to the remote end of the duct. An insulating layer and a protective wire rope sheath cover the conduit to form the controllable stiffness duct.

Abstract: A protective clamp assembly is provided for securing a conductor lines to the production tubing of oil and gas wells and providing for efficient transition of the conductor lines past the various connections of the well tubing. To prevent crushing or other damage to those portions of the conductor lines that are located at tubing connections, the clamp assembly of this invention provides for efficient transition of the conductor lines past the enlarged connections of the tubing. Under circumstances where the tubing is brought into forcible contact with the well casing within which it is received, the protective clamp assembly contacts the well casing thus preventing the well casing from applying crushing force to the conductor lines.

Abstract: An apparatus for heating liquid in a pipe to prevent freezing of the liquid and for de-icing of frozen pipes includes an elongated housing constructed of plastic material and having a central bore and fittings for detachably coupling each end of the housing to the open end of a liquid pipe so that the central bore connects a first liquid pipe to a second liquid pipe. The fittings each comprise a sleeve attachable to the pipe end, a sealing gasket between the end of the housing and an annular flange on the sleeve, and a threaded coupling nut cooperating with external threads on the housing and having a flange engaging the sleeve flange. The housing includes a lateral passageway intermediate its end communicating with the central bore and closed by a sealer valve having an opening with a normally closed penetrable seal of elastomeric material.

Abstract: A hose construction and method of making same are provided wherein such hose construction comprises a flexible corrugated hose made of polymeric material, a pair of hose connectors fixed to opposite ends of the hose, and a sleeve disposed around the hose and having opposite end portions wherein the sleeve is fastened to the hose only at its opposite end portions and the sleeve serves to improve the fluid pressure resistance and external wear resistance of the hose while keeping its flexibility substantially intact.

Abstract: A hose assembly of limited conductivity designed to bleed static electric charges such as encountered in paint spraying. The assembly includes, as is conventional, a stem fitting 1, a reinforced hose 3 fitted over the stem 7 of the fitting 1, and a crimped shell 5. The novel element is a conductive coupling ring 13 that is adapted to establish an electrically conductive path between the hose coupling 1 and the conductive element 26 of the hose 3. The conductive coupling ring 13 includes a number of tines 19 and, when assembled between the coupling 1 and the hose 3 will, on its one side, seat against a shoulder 11 of the coupling 1, and the tines 19, on its other side, will penetrate the reinforcement 23 and 24 of the hose 3 and establish electrical contact with the conductive element 26.

Abstract: A thermally insulated composite flexible hose, particularly suited for heat exchanger connections in building structures, comprising an outer foam jacket of thermal insulation and an inner extended unitary elastomeric extrusion comprising primary tubes spaced apart by an intermediate section separable therefrom along tear lines. The intermediate section may comprise two additional tubes smaller in diameter than the primary tubes. Insulated electrical conductors may be disposed along the outside of the unitary extrusion and inside the jacket.

Abstract: A hose assembly of limited conductivity designed to dissipate static electric charges, such as encountered in paint spraying. The hose assembly includes a reinforced hose 1 fitted over the nipple 15 of a stem 13, and a shell 14 holding the hose 1 in compression over the nipple 15 of the stem 13. The novel element is a stripe of conductive polymer 11 in the cover 9 of the hose 1 extending from the static drain 7 to the surface of the hose 1. When the shell 14 is compressed over the hose 1, the conductive stripe 11 is seated and held in secure electrically conducting relationship with the inner diameter of the shell 14.

Abstract: A side entry apparatus for use in a drill string permits a wireline to be connected with tool apparatus within the pipe and passed to the exterior of the pipe intermediate the ends of the drill string so that sections of pipe may be added to the drill string without interrupting the connection and resulting communication between the wireline and tool apparatus to which it is connected. The side entry apparatus includes a housing having an opening through the wall of the housing. A sealing element is arranged to be positioned about the wireline, between the wireline and the opening. A jacking mechanism is used to compress the sealing element and thereby move it into sealing contact about the wireline.

Abstract: A method is disclosed for structuring a plurality of supply and control conduits having a length substantially greater than its cross sectional width wherein the control conduits for each supply conduit are segregated and covered. The segregated and covered control conduits are bundled in a generally annular shape and the supply conduits are placed around the control conduits in a generally circular fashion. The entire bundle is then covered to retain its circular shape by periodically fastening the resultant bundle circumferentially or by extruding a covering over its entire length.

Abstract: Flexible production tubing is wound about a reel for easy and convenient transport to and from a well site. A submersible pump is attached directly to the end of the flexible tubing and is lowered through the well casing to a producing formation. Insertion and withdrawal of the flexible tubing is accomplished with a hydraulically powered drive sprocket assembly mounted above the well head equipment. The flexible tubing is reinforced by striker plate assemblies which are engaged by the teeth of the drive sprocket, thereby providing positive traction for insertion and withdrawal without damaging the flexible core. The flexible production tubing includes a high strength injection core, a tubular production conduit embedded within the core, and a series of striker plate assemblies partially embedded within the core.

Abstract: A vacuum cleaner hose is equipped with an electrical cable which runs in parallel to the longitudinal axis of the vacuum cleaner hose in a groove or in contact with a flattened portion of the vacuum cleaner hose which is encased together with the electrical conductor by an outer jacketing hose. Alternately, the cable may be enclosed in a smaller diameter hose which in turn is connected to the outer wall of the vacuum cleaner hose in the groove formed in the vacuum cleaner hose. The electrical cable may be embedded in a foam material which forms a segment of the vacuum cleaner hose inside the jacketing hose.

Abstract: A sub for connection into a drill string which has a cable extending along the outside of the string to the location of the sub and then extending downwardly within the string beyond the sub. The sub includes two members which are connectable to upper and lower portions of the drill string and are detachably connectable to one another, preferably by a surrounding threaded sleeve, with the cable extending between the two members in sealed relation from the exterior of the first member to the interior of the second.

Abstract: A flexible conduit with a quadrangular hollow casing-shaped wire in the side wall of the conduit and extending the length of the conduit. The casing-shaped wire has at one side bent unjoined and overlapping extremities of the metal strip from which the wire is formed and is capable of receiving a hydraulic or electrical control line therein.

Abstract: When a submerged pump is supported on its discharge pipe in a deep well, such as an oil well, the electric power supply cable to the pump is strapped to the side of the discharge pipe. The cable banding lock ring engages around the strap between the cable and discharge pipe to increase the wrap of the strap around both the power supply cable and the discharge pipe.

Abstract: An electrical current-carrying flexible hose wherein a strip is helically wound in tubular form with interlocking tongue and groove edge portions and insulated electrical conductor means are disposed within a hollow central section between the edge portions.

Abstract: A conduit is provided for transmitting both electrical power and pressured hydraulic fluid from the surface to a point in a subterranean well. The conduit comprises an outer housing formed of steel or other high tensile strength material and one or more insulated wires of copper or similar low tensile strength, highly conductive metal which are run through the outer housing. Supports are provided between the external surfaces of the insulated wires and the internal wall of the housing to frictionally anchor the insulated wires to the housing. The supports also define fluid passages therethrough so that pressured fluid may be transmitted through the bore of the housing. So that the wires are gravitationally stabilized within the outer housing, the average density of the supports and the pressured fluid is approximately equal to the average density of the insulated wires.

Abstract: A coupling assembly is provided including a pair of confronting conduit members. Each conduit member has an annular flange fixed to the confronting ends of the conduit members. A circumferentially extending coupler surrounds portions of the flanges. A resilient bonding jumper transversing the circumferential wall of the coupler provides electrical continuity between the conduit members. The bonding jumper includes a body portion and a pair of arms fixed to opposite ends of the body portion. The arms extend in opposite directions. When the coupler is secured to the flanges, each arm contacts one of the flanges and a torque is produced tending to force the other arm into secure electrical contact with its contacted flange.

Abstract: A rigid extension member, for use with a well-logging cable in a borehole, has a means for protecting the well-logging cable disposed along the length of, and on the outer surface of, a cylindrical tube. Means for detachably securing the well-logging cable within the protection means is also provided.

Abstract: A composite, flexible tubing assembly (22) for conveying fluids along plural flow paths is provided by an integrated assembly of a relatively large diameter core tube (32) for conveying production fluid, electrical conductors (42, 44, 46, 48) and a plurality of relatively smaller diameter tubular conduits (38, 40) for conveying electrical power and/or pneumatic/hydraulic fluid to the drive motor of a downhole pump, respectively. High tensile strength is provided by a group (36A) of flexible strands (36) and a protective, high tensile strength polymer sheath (34) which encloses the core tube (32) and tubular conduits (38, 40). The assembly (22) is further strengthened by an injection body (58) of filler material disposed in the annulus intermediate the core tube (32) and the protective sheath (34).

Abstract: An electrical conduit formed of helically fabricated grounding and reinforcing elements, including a spaced-turn foil channel defining a substantially smooth conduit bore, and an end fitting in combination with the conduit.