MXPA00000688A - Hose assembly and method for making same - Google Patents

Abstract

A method of making a hose assembly (10) includes the steps of disposing a reinforcing layer (14) having interstitial spaces extending therethrough about a tubular inner liner (12) and heating an outer surface (16) of the inner liner (12) to cause it to melt and disperse into the interstitial spaces of the reinforcing layer (14) and the fibers themselves to bond the first layer to the inner liner (12). A lightweight hose assembly (10) of the type adapted for conveying fuels and other corrosive fluids is also disclosed. The assembly (10) includes a tubular inner liner (12) including a melt extrudable polymeric fluorocarbon material having an external surface (16). A layer (14) having gaps extending therethrough is disposed about the inner liner (12). The inner liner (12) is dispersed into the layer (14) and bonds the layer (14) to the external surface (16) of the inner liner (12).

Description

HOSE ASSEMBLY AND METHOD FOR MANUFACTURING THE SAME DESCRIPTION OF THE INVENTION The subject invention relates to a hose construction. More specifically, the subject invention relates to a method for constructing a hose assembly having an inner fluorocarbon polymer coating and a reinforcement layer thereof. Hose assemblies for transporting fuel and other corrosive materials are well known in the art. Such assemblies are exposed to a variety of combustible mixtures, combustible additives, and caustic materials in addition, being exposed to extreme temperatures. Thus, such hose assemblies must be resistant to chemical, environmental, and physical degradation as a result of chemical exposure, environmental exposure to heat, and the physical degradation resulting from repeated bending and motion or forces applied to the body. assemble Polymeric fluorocarbon materials such as polytetrafluoroethylene possess the required chemistry and temperature resistance properties for more fuel hose applications. Unfortunately, the polymeric fluorocarbon materials exhibit relatively poor stress and tangential strengths. As a consequence, such fluorocarbon materials are prone to curling.

Such curling residues remain and provide a continuous resistance to the flow of fluid through the hose assembly. Furthermore, as a result of a low tensile strength of the fluorinated materials attached or secured to the coupling members to the hose assembly are substantially compromised. Several approaches have been described to offer additional resistance to an internal fluorocarbon polymer coating. One approach involves braiding fibers around the internal fluorocarbon coating. The braided fibers offer additional resistance to the fluorocarbon coating resulting in a hose assembly that resists curling. Examples of such approaches are described in U.S. Patent Nos. 5,124,878, issued June 23, 1992, 5,142,782, issued September 1, 1992, and 5,192,476, issued March 9, 1992. 1993, all assigned to the assignees of the subject invention. The hose assembly described in the '878 patent includes an internal fluorocarbon polymeric coating, a braided reinforcement layer disposed approximate to the exterior of the inner lining and characterized in that it includes an organic polymeric material dispersed in the reinforcement layer which connects the layer of reinforcement to the inner lining, so it provides a hose assembly that is stronger and more resistant to curling.

Patents 782 and 76 describe methods for producing a hose assembly of the type shown in the '878 patent. The '782 patent discloses a method of manufacturing a low weight hose assembly that includes the steps of extruding an inner liner, applying a braided reinforcement material having voids extending through voids extending therethrough. around the inner lining. The inner lining and the braided layer are then passed through a vessel containing a solution of a fluorocarbon polymer. After the solvent is removed, the fluorocarbon polymer coating is dispersed through the braided layer and joins the braided layer to the internal fluorocarbon coating. The M76 patent describes a method for forming a hose assembly in which an internal coating of a fluorocarbon material is extruded and then passed through a container containing a dispersion including a fluorocarbon polymeric material. A reinforcing layer is then braided around the outside of an inner lining to form a braided layer having the dispersion therein such that the dispersion penetrates the interstitial spaces of the braided layer. Subsequently, the assembly is heated to remove the solvent and the braided reinforcement layer is then bonded to the internal fluorocarbon polymer coating. The methods described in patents A82 and 76 produced a hose assembly made highly desirable and excellent, however, the steps of applying the dispersion of the fluorocarbon polymer to the inner coating may allow some of the dispersion of the fluorocarbon polymer to enter the interior of the hose where it can cause problems when the hose assembly is used in a desired application. Additionally, the hose assemblies discussed above preferably use extruded fluorocarbon polymers without melting for the inner coating. These polymeric extruded fluorocarbon materials without melting normally have a high permeation ratio that melts the extruded fluorocarbon polymeric materials. That is, the ability of volatile fluids or gases to escape through the wall of the inner lining is greater with hose assemblies based on extruded fluorocarbon without melting. Additionally, fluorocarbon materials extruded without melting are not readily adaptable to recycle or reuse of the material such as molten extruded fluorocarbon materials. A further example of strengthening the coating of internal fluorocarbon with an outer coating while also increasing flexibility is shown in US Patent No. 3,023,787 issued to Phillips et al. The Phillips et al. describes a twisted hose assembly having an internal fluorocarbon coating constructed of many layers of helically wrapped Teflon® tape. Twisted hoses are normally used because they provide flexibility to a fluorocarbon hose assembly, however, twisted hose assemblies have inherent weaknesses. A reinforcing strip consisting of reinforcing fibers coated with a plastic material is wrapped around the inner layer to provide additional strength to the assembly due to the inherent weakness of the wrapped twisted core construction. In its final assembly, a metal braid is applied to the outside of the hose assembly to impart greater strength. Hose assemblies of the type described in the Phillips et al. Patent have various inherent setbacks. First, because the inner lining is formed by the helically wrapped layers of a fluorocarbon tape, it requires a greater amount of fluorocarbon material to be used in order to build the inner lining which adds to both the cost of building the liner. hose assembly and labor intensity of hose assembly construction. Other setbacks associated with hoses of the type described in the Phillips et al. Patent include the failure of seams created by helically wrapped Teflon® layer tapes. These failures occur due to the inherent weakness in the binding of the seams created by the overlapping layers of the tape which, under internal pressures and prolonged movement are prone to escape or bursting. In addition, the seams create ripples within the inner lining which causes disruption in the flow of liquids which could give rise to the increase in electrical charge accumulated inside the hose. Therefore, it may be desirable to have a method for constructing a fluorocarbon hose assembly which eliminates the need for dispersions of liquid fluorocarbon polymer in order to bond the reinforcing layers to a fluorocarbon coating. In addition, it may be desirable to have a hose assembly which includes an internal polymeric fluorocarbon coating which is resistant to curling while having greatly increased bending properties while maintaining the overall integrity of the hose assembly. In accordance with the present invention, a method for constructing a hose assembly is provided.

The method includes the steps of arranging a reinforcing layer having interstitial spaces extending through approximately a tubular inner liner and dispersing the reinforcing layer in the interstitial spaces and bonding the reinforcing layer to the inner lining. Additionally, consistent with the present invention, there is provided a hose assembly which includes an extruder, a tubular inner lining of soft inner diameter that includes an extruded polymeric fluorocarbon material having an outer surface and a reinforcement layer having voids that are Extend through the arranged around the outer surface. The outer surface of the inner lining is dispersed in the reinforcing layer and bonds the reinforcing layer to the outer surface of the inner lining. BRIEF DESCRIPTION OF THE DRAWINGS Other advantages of the present invention will be readily appreciated as the same one that best adheres to the understanding by reference to the following detailed description when considered in connection with the accompanying drawings wherein: Figure 1 is a perspective view of the preferred embodiment of the present invention; Figure 2 is an elongated sectional view of the hose assembly; Figure 3 is a perspective view of an alternative embodiment of the present invention; Figure 4 is a perspective view of the extrusion of the inner lining of the method of the preferred embodiment of the present invention; Figure 5 is a perspective view of the hose assembly having a hose attached thereto; and Figure 6 is a perspective view of the hose assembly with the administration of both heating and cooling elements to ensure adhesion of the braided layer. A hose assembly made in accordance with the present invention is generally shown at 10 in Figure 1. The assembly 10 includes a tubular inner liner 12 and a reinforcing layer 14 disposed around the inner lining 12. Coupling means 20 adapted for coupling The ends of the hose assembly 10 can be included. The inner tubular layer 12, as best shown in Figures 1 and 2, includes a fused extruded polymeric fluorocarbon material resistant to chemical and heat degradation, this allows a variety of fluids, particularly automotive fuels and fuel additives, for example, detergents, alcohols, etc., which pass through the inner lining 12 without corroding or degrading the inner lining 12. The inner lining 12 is preferably extruded using well-known melt or paste extrusion techniques and has a wall thickness between 0 and 0.30 cm (0.001 and 0.120 inches). The walls of the innerliner 12 define an inner surface 15 and an inner passage 22 of the innerliner 12. Although the innerliner 12 may be made of any number of polymeric fluorocarbon materials, the innerliner 12 is preferably made of a polymeric material of fused extruded fluorocarbon including perfluorinated ethylene-propylene (FEP), tetrafluoroethylene copolymer and hexafluoropropylene sold under the trademark TEFLON © FEP by DuPont, perfluoroalkoxy fluorocarbon resins (PFA), the tetrafluoroethylene-perfluorovinyl ether copolymer sold under the trademark TEFLON® PFA by DuPont, or the ethylene tetrafluoroethylene copolymer (ETFE) sold under the trademark TEFZEL by DuPont. In addition to the aforementioned polymeric fluorocarbon materials, any other molten extruded fluorocarbon polymer materials known to those skilled in the art can be used. To one side of the manufacturing benefits detailed herein, using the molten extrusion materials allowed for any piece of molten extruded material to be newly cast and therefore recycled into the manufacturing facility. Another benefit using a molten extrusion inner liner 12 is lower than the gas permeation ratio and / or liquids through the hose assembly 10. Fluoroplast extruded from pulp such as PTFE, during the sintering process, may have gaps which in turn may have high permeation. The liner 12 is extruded to provide an inner liner 12 which has a smooth inner diameter, free of ripples and seams which can cause turbulence of fluid flow within the inner lining 12. Turbulence can cause strengthening of an electrical charge within the hose assembly which is undesirable in the situation where flammable fluids are potentially being transported therein. The internal extrusion liner 12 creates an inner liner 12 which has no seams and corrugations and is therefore the preferred method for forming the inner lining 12. By molten extruded fluorocarbon polymer material, it is understood that the material, in suitable conditions such as increased temperatures, can cause melting or flow in such a manner that the fluorocarbon material flows around the reinforcing layer 14 and substantially encapsulates the reinforcing layer 14 whereupon the fluorocarbon material is cooled, the coating inner 12 and the reinforcing layer 14 which are joined to one and the other forming an integral hose assembly. The assembly 10 includes the reinforcing layer 14, which has recesses extending therethrough. Generally, the reinforcing layer 14 is constructed of a braid or woven material. Due to the inner lining 12 made of a molten extruded material, it is allowed for the use of monofilament braiding material for the reinforcing layer 14 which is significantly less extensive than the multifilament braiding material. The layer 14 may comprise any non-metallic material disposed in the interparticle or wrapping form tight around the inner lining 12. The material of the layer 14 is generally constructed of a braid or weave of interlocking fibers which creates gaps or interstitial spaces which facilitate the connection of the layer 14 to the inner lining 12. Preferably, the material used for the layer 14 is glass fiber such as glass fibers. The glass fibers provide the necessary strength needed to reinforce the inner liner 12 and are heat resistant which is important for use in high temperature environments. The layer 14 adds tensile strength to the hose assembly 10, and the layer 14 imparts increased tangential strength to the hose assembly 10.

In a preferred embodiment, the glass fibers are tight tissues such as the voids and spaces between the adjacent fibers are minimized. The glass fibers are preferably woven in a neutral braid. This angle is preferred since there is no movement of the internal pressure under the hose in either the longitudinal or diametric form. It is preferred that the braid angle is like closing the neutral angle as possible. However, the variations in. materials, selection of reinforcement fiber material, and the machines used to apply the braid in the part of some variation. The reinforcing layer 14 is preferably applied around the exterior of the inner liner 12 when using a braiding machine well known in the art. The machine includes a plurality of reels that carry the fiber material. The fibers are fed through the machine to a braiding area. In the braiding area, the fibers are braided or wound around the liner 12 to form the braided reinforcement layer 14. Alternatively, the reinforcement layer 14 can also be constructed in a previous, bowl-shaped embodiment and then applied around the outside of the inner lining 12.

Due to the chemistry of the inert and general lubricant nature of the polymeric fluorocarbon materials, relative to the movement between the internal and external concentric polymeric fluorocarbon coatings is frequently encountered in the hose assemblies of the prior art. This drives the movement relative to the weakness in the final hose assembly. The present hose assembly 10 is modified to eliminate such movement relative to the inner liner 12 and the layer 14. The hose assembly 10 is constructed in such a way that the molten extruded fluorocarbon material forming the inner lining 12 also bonds the layer reinforcement 14 to the inner lining 12 to form an integral assembly and therefore eliminates relative movement between the inner lining and the reinforcement layer 14. As stated above, the inner lining 12 is constructed of a material, which when heated at a desired temperature 260-399 ° C (500 ° F -750 ° F), the outer surface 16 of the inner liner 12 melts and flows into the interstitial voids or spaces which comprise the braided material to form a mechanical bond which forms integrally the reinforcing layer 14 to the inner lining 12. That is, the heat is applied to the outer surface 16 of the lining in 12 by a mechanism such as a forced air heating unit. The material comprising the inner liner 12 is heated in such a way that substantially only the outer surface 16 converts the fluid sufficient to the flow in, and approximately the reinforcing layer 14. The heating of the outer surface 16 is controlled in a form which it does not allow the internal surface 15 of the inner liner 12 or substantially all of the wall thicknesses of the inner lining 12 to convert to sufficient heat to convert fluid, melt or deformed. For additional control the bonds of the layer 14 to the inner lining 12, the inner passage 22 of the inner lining 12, can be pressurized and / or cooled to prevent the inner passage 22 and the inner surface 15 of the inner lining 12 of the deformed transformation or printed with the plaiting pattern of the layer 14. By maintaining a positive pressure in the inner passage 22 of the inner lining 12 during heating of the outer surface 16, the uniformity of the inner lining 12 can be controlled and / or maintained. The internal pressure is preferably in the range of 1-100 psi. The bonding of the layer 14 to the inner lining 12 can also be increased by cooling to the interior 22 of the inner lining 12 while heat is applied thereto. The interior 22 of the inner lining 12 can be cooled by, for example, passing a fluid, or a gas having a temperature lower than the melting temperature of the particular molten extruded fluorocarbon material, through the interior 22 of the inner lining 12. The cooling fluid may be a gas, a liquid or any other fluid or combination of fluids suitable for this purpose. For example, the fluid may be air or water. Generally, the fluid is chosen in such a way that it is compatible with the desired molten extruded fluorocarbon material and such that it would not cause problems if the residual cooling fluid is remaining in the fluid. hose assembly 10. The temperature range for the cooling fluid can vary from -39 ° C - 93 ° C (-40 ° F - 200 ° F) using fluids such as nitrogen, "helium, etc. The cooler can also be applied under pressure, as described above, to achieve simultaneously heat the exterior 16 of the liner 12, and cooling the interior 22 of the inner lining 12. An example, air or water maintained at a temperature lower than the melting temperature of the molten extruded polymer can be pressurized to a pressure (e.g. . ) suient to maintain the integrity and size of the The inner liner 12 is simultaneously prevented from flowing or melting the internal surface 15 of the inner liner 12. The hose assembly 10 is then subsequently sintered at a suitable temperature (approximately 371 ° C (700 ° F)) to curing the dispersed fluorocarbon polymer material through the layer 14. The sintering operation fuses the fluorocarbon polymeric material of the inner liner 12 to the layer 14 and the inner lining 12. The bond between the layer 14 and the inner lining 12 prevents a slip, i.e. relative longitudinal or rotational movement between the inner liner 12 and the layer 14. That is, the molten material of the inner lining 12, dispersed through the layer 14 and mechanically attached to the layer 14 to the inner lining 12 so that it provides resistance to the inner lining 12 in the flexure of the hose assembly 10. Thus, at u By using an internal coating of extruded polymeric fluorocarbon 12, which is dispersed through the layer 14, a hose assembly 10 is produced which results in the tangential strength of the inner lining 12 which is increased in such a way that the inner lining 12 It can be twisted without curling. In addition, linking together the inner liner 12 and the layer 14 allows the hose assembly 10 to operate at high operating pressures and, therefore, accommodate fluids conveyed under higher pressures. An optional metallic outer layer or painted layer braid 18, as best shown in Figures 1 and 2, can be arranged around the layer 14. The metallic braided layer 18 includes a metallic material to increase the strength and flexibility of the assembly of hose 10. More specifically, the metal outer layer 18 allows the inner liner 12 to be twisted to a small radius without crimping. The outer metallic layer 18 provides resistance to the inner lining 12 in bending. This is commonly mentioned as the tangential resistance. Thus, by arrangement, the outer metallic layer 18 around the layer 14 and the inner lining 12, the tangential strength of the inner lining 12 is increased, thus improving the flexible radius of the hose assembly 10. The improvement in the flexible radius allows the - Hose assembly 10 be manipulated or placed in configurations which could affect or rip the internal lines of hose assemblies of the prior art. That is, the metal outer layer 18 allows for a reduction in the static flexible radius of the hose assembly 10 thereby allowing the hose assembly 10 to be used in a larger number of applications. Additionally, the metallic outer layer 18 adds to the breaking strength of the hose assembly. The outer metal layer 18 allows the hose assembly 10 to be used in applications where the hose assembly 10 is operated at much higher operating pressures without bursting of the hose assembly 10. In additionThe metallic outer layer 18 provides for a better positive attachment of couplings or extreme adjustments 20 to the hose assembly 10 as shown in Figure 1. The metallic outer layer 18 additionally increases the tensile strength of the hose assembly 10. sufficiently to securely connect the coupling member 20 (Figure 1) to the hose assembly 10. The outer metal layer 18 may be made of any suitable material. In the preferred embodiment of the hose assembly 10, the outer layer 18 is made of stainless steel. . The metallic outer layer 18 is preferably braided in place over the reinforcing layer 14. The metallic braided outer layer 18 is preferably applied around the outside of the reinforcing layer 14 when using a braiding machine well known in the art. The machine includes a plurality of coils which carry approximately sieved stainless steel wire material. The stainless steel wire is fed through the machine to the braiding area. In the braiding area, the wires are braided or wound around the outside of the reinforcing layer 14. Alternatively, the metallic braided layer 18 can also be constructed in its entirety in a basin-like manner and then applied around the exterior of the braid. reinforcement layer 14. Unless layer 14, the metallic braided outer layer 18 is not attached to any of the underlying structure. That is, the braided metal outer layer 18 is not fixed to the underlying hose assembly. The braided layer 18 can be applied using a braiding machine that is commonly known as a projector braider or can be applied using a rotating braider that is commonly used in the art. Each machine applies the braid differently, however, it achieves the same results, that is, a construction of Z over Z. As the fluid flow through the inner liner 12, electrical charges can accumulate over the entire length of the inner liner 12. To prevent these electrical accumulation charges, the inner liner 12 can include an integral longitudinal duct 20 coextensive with the length of the inner liner 12 to conduct an electrical charge along the length of the inner lining 12. The integral conductor 24 includes a conductive strip 24 of the carbon black, as shown in Figures 1 and 2. The integral conductor can also intercalating through the inner liner 12 by the intermixed carbon black 26 through the polymeric fluorocarbon material either while the inner liner 12 is extruded or before the extrusion of the inner liner 12 as shown in the Figures. The hose assembly 10 may further include a coupling 20 as shown in Figure 1. The coupling 20 is adapted to couple the ends of the hose assembly 10 to interconnect the hose assembly 10 to the fluid flow, eg, flow of the hose assembly 10. fuel, and of a fuel tank (not shown). Couplings suitable for use with the hose assembly 10 of the present invention are well known in the art. Typically, the couplings 20 are adapted to couple the ends of the hose assembly 10. Typically, the couplings are adapted by a barb shape which engage the inner surface 15 of the inner liner 12. The coupling 20 may also include a portion of attractiveness. (not shown) extending longitudinally of the inserted portion for coupling an attachment (not shown). The engaging portion may comprise a male skewer member 28 - or female skewer member (not shown). The attraction portion may comprise any configuration that could cooperate with the member to which it is connected. For example, the attraction portion may comprise a plug for receiving a joint ball joint (not shown). Alternatively, the coupling 20 can be molded, such as by injection molding, to the hose assembly (not shown). The molten extruded material allows for plastic adjustments to be molded directly into the hose assembly 10 thereby eliminating curling, and its associated disadvantages, as the preferred method of setting adjustments to the hose assembly 10. This is made possible to eliminate the separate operations of hose making, fit fabrication, and fitting attachment to the hose to allow fit to be directly formed (molded), fixed, and sealed to the hose assembly. Additionally, the coupling 20 can be any other well-known type of coupling known to those skilled in the art. Throughout this application, several publications are referred by mention or number. Complete mentions for the publication are listed below. The description of these publications in their entirety are incorporated herein by reference in this application for the purpose of further describing the state of the art to which this invention pertains.

The invention has been described in an illustrative form, and the terminology used which is intended to be in the nature of the description rather than the limitation is well understood. Obviously, many modifications and variations of the present invention are possible in the clarity of the above teachings. Therefore, it will be understood that within the scope of the appended claims, the reference numbers are primarily for convenience and are not in any way limiting, the invention may be practiced otherwise than as specifically described.

Claims (34)

1. CLAIMS 1. A method for the construction of a hose assembly, the method is characterized in that it comprises the steps of: arranging a reinforcing layer having interstitial spaces extending therethrough around a tubular inner lining and dispersing a surface of the inner lining in the interstitial spaces of the reinforcement layer and bond the first layer to the inner lining. The method according to claim 1, characterized in that it includes the step of extruding a tubular inner liner comprising a molten extruded fluorocarbon polymer material and having an internal passage defined by an internal surface thereof. 3. The method according to claim 1, characterized in that the disposed stage is further defined as the braiding of a reinforcing layer. 4. The method according to claim 2, characterized in that it also includes the step of preventing the flow of the internal surface, while maintaining the flow of the external surface. 5. The method according to claim 4, characterized in that it also includes the step of cooling the internal passage. 6. The method in accordance with the claim 5, characterized in that the cooling step is further defined as the arrangement of a fluid in the internal passage. The method according to claim 6, characterized in that the fluid is a gas. 8. The method of compliance with the claim 6, characterized in that the fluid is a liquid. 9. The method according to claim 6, characterized in that the fluid is cooled. 10. The method of compliance with the claim 4, characterized in that it also includes the step of maintaining the expansion of the inner lining. The method according to claim 10, characterized in that the stage of maintaining the stage further includes pressurizing the internal passage. The method according to claim 10, characterized in that the pressurization step is defined as being arranged in the fluid within the internal passage. 13. The method according to the claim 12, characterized in that the fluid is a gas. 14. The method according to claim 1 * 2, characterized in that the fluid is a liquid. 15. The method according to claim 12, characterized in that the fluid is cooled. 16. The method according to claim 1, characterized in that it includes the additional step of arranging a second layer around the reinforcing layer. 17. The method according to claim 16, characterized in that the second layer includes a braided reinforcement material. 18. The method according to claim 17, characterized in that the material is one of the group consisting essentially of stainless steel, glass, Aramid fiber, PVDF fiber or PPS. The method according to claim 1, characterized in that it further includes the step of fixing at least one extreme fit to the hose assembly. 20. A hose assembly, characterized in that it comprises: an extruder, a tubular inner liner of soft inner diameter, comprising a molten extruded polymeric fluorocarbon material having an outer surface and a reinforcing layer having recesses extending through of it arranged around the outer surface, the inner lining is being dispersed in the reinforcing layer and links the reinforcing layer to the outer surface of the inner lining. 21. The assembly according to claim 20, characterized in that the assembly is free of additional polymeric fluorocarbon dispersions. 22. The assembly according to claim 20, characterized in that a reinforcing layer is disposed around the reinforcing layer to increase the strength and hose assembly properties. 23. The assembly according to claim 21, further characterized in that the reinforcing layer has an outer periphery, the inner lining extends from the outer periphery of the reinforcement layer, radially inward of the inner lining. 24. The assembly according to claim 20, further characterized in that the reinforcing layer includes a non-metallic inwardly wound material. The assembly according to claim 24, further characterized in that the non-metallic material includes one of the group consisting essentially of glass fiber, aramid, PVDF and PPS fiber. 26. The assembly according to claim 20, further characterized in that the external reinforcing layer includes a metallic material. 27. The assembly according to claim 26, further characterized in that the metallic material includes stainless steel. 28. The assembly according to claim 20, further characterized in that the molten extruded polymeric fluorocarbon material includes perfluorinated ethylene-propylene. 29. The assembly according to claim 20, further characterized in that the molten extruded polymeric fluorocarbon polymer includes perfluoroalkoxy. 30. The assembly according to claim 20, further characterized in that the molten extruded polymeric fluorocarbon material includes perfluoroalkoxy fluorocarbon resin. The assembly according to claim 20, further characterized in that the molten extruded polymeric fluorocarbon material includes one of the group consisting essentially of a polymer of ethylene tetrafluoroethylene, PVDF and THU. 32. The assembly according to claim 20, further characterized in that the inner sheath includes integral conductive means co-extensive with the length of the inner sheath to conduct electrical charges along the length of the inner sheath. 33. The assembly according to claim 22, further characterized in that the integral conductive means includes carbon black. The assembly according to claim 20, characterized in that it includes coupling means adapted to couple the ends of the hose assembly to interconnect the hose assembly to the fluid flow.