Abstract: A multi-layered pipe of arbitrary length and cross-section is produced by co-extrusion of a lower polyolefin (C2-C4) outer body over the exterior surface of a tubular core of randomly, partially randomly, or blocky chlorinated lower polyolefin, the core having a wall thickness, measured in the radial direction, in the range from about 0.025 mm to 5 mm. The tubular core is coextensive with essentially the entire length of the pipe. The tubular core comprises a major proportion by weight of the randomly chlorinated polyolefin (r-CPO), or, partially randomly chlorinated polyolefin (pr-CPO), or, a blocky chlorinated polyolefin (b-CPO), any of which may be blended with a minor proportion by weight of a blending ingredient. The r-CPO, pr-CPO or b-CPO, or a blend thereof, each has an extrusion temperature in the same range as that for the corresponding non-halogenated polyolefin, namely in the range from about 150° C. to 250° C.

Abstract: A pipe of layers of thermoplastic polyolefins of the same type, however with different properties, which are connected inseparably with one another, an outer first layer and a second layer, adjoining the first layer on the inside, consisting of a material, which has not been cross-linked, the second layer approximately having the FNCT the value or the NPT value of a one-layer standard pressure pipe and the first layer having an FNCT or NPT value, which is higher by a factor of at least 3 than that of the second value. Moreover, a third layer is provided, which adjoins the second layer on the inside, also consists of material that is not cross-linked and has a PNCT, which is higher by a factor of at least 3 than that of the second layer and an NPT layer, which is higher by a factor of at least 2 than that of the second layer.

Abstract: A resinous tube for piping in a fuel system of an automotive vehicle. The resinous tube comprises at least one first cylindrical resin layer (A) including at least one resin selected from the group consisting of polybutylene terephthalate (PBT), polybutylene naphthalate (PBN), polyethylene terephthalate (PET) and polyethylene naphthalate (PEN). At least one second cylindrical resin layer (B) is formed generally coaxial with the at least one first cylindrical layer and includes at least one of polybutylene terephthalate (PBT) copolymer and polybutylene naphthalate (PBN) copolymer. In this tube, a cylindrical resin layer forming an innermost layer of the resinous tube is electrically conductive, fuel being in direct contact with an inner surface of the innermost layer.

Abstract: A fuel hose having a fluororesin layer formed from a copolymer of vinylidene fluoride and chlorotrifluoroethylene by powder coating or the like on the inner surface of a rubber tube is characterized by at least one of the following: (1) the copolymer contains a metal salt; (2) the rubber tube is of a mixture containing acrylic rubber; and (3) the rubber tube contains an organic ammonium salt or the like. The fuel hose is high in gasoline impermeability and flexibility and has a strong adhesion between the rubber tube and fluororesin layer.

Abstract: A hose for fuel transportation including an inner layer which is a fluororesin layer having electrical conductivity, and an outer layer which is a fluororesin layer having no electrical conductivity, wherein the fluororesin layer in the inner layer includes a material having electrical conductivity, and the material having electrical conductivity comprises a metallized inorganic compound having a surface portion including one of zinc oxide, glass beads and titanium oxide.

Abstract: A laminated nylon air brake tubing is formed from outer and inner layers of nylon 11 or nylon 12 with inner layers of nylon 6. The nylon 6 and nylon 11 or 12 layers are adhered together by a tie layer. The tie layer is preferably a nylon 6-12 or an anhydride modified polyolefin. The air brake tubing has improved high temperature strength and low temperature impact resistance characteristics.

Abstract: A fuel hose having a two layer structure comprising an inner layer made of a fluororesin and an outer layer adjacent thereto, made of a thermoplastic resin other than a fluororesin, wherein the fluororesin has a tensile strength at break of higher than 21 MPa, and the fluororesin of the inner layer has a melt adhesiveness with the thermoplastic resin of the outer layer.

Abstract: A heat-resistant multi-layer hose is described. The hose includes inner and outer elastomeric layers, and an intermediate reinforcing layer. The inner and outer layers each include a substantial fraction of ethylene-octene copolymer, and may include one or more compatible polymers such as EPDM, chlorosulfonated polyethylene, and chlorinated polyethylene. The use of relatively large amounts of ethylene-octene copolymer results in improved high heat resistance.

Abstract: A hose for fuel having a laminated structure comprising an inner layer (A) made of a ethylene/tetrafluoroethylene copolymer adhesive to a polyamide resin and an outer layer (B) made of a polyamide resin, is formed. Such a hose for fuel is excellent in interlaminar adhesive strength and also excellent in antistatic properties and fuel permeation-preventing properties, and particularly, the dependency of the interlaminar adhesive strength on the take-up speed during the co-extrusion molding, is small.

Abstract: A fuel transport tube having improved fuel vapor permeation characteristics comprising an inner conductive nylon tubular structure, an aluminum barrier layer on the outside surface of the nylon inner tubular layer, and a non-conductive nylon layer on the outer surface of the aluminum layer; and a method for making the fuel transport tube are disclosed.

Abstract: According to the present invention, there is provided a hose assembly with an inner fluoropolymer layer having a smooth inner surface and an outer polyamide layer having an undulated surface.

Abstract: A layered tubing for use in a motor vehicle composed of a thick outer tubing having an inner and an outer face, the outer tubing made of an extrudable thermoplastic such as a polyamide like Nylon 12; a thin intermediate bonding layer bonded to the inner face of the thick outer layer, the bonding layer composed of an extrudable melt-processible thermoplastic such as poly butylene terepthalate capable of sufficiently permanent laminar adhesion to the polyamide outer tubing; and an inner layer bonded to the intermediate bonding layer, the inner layer composed of an extrudable, melt-processible thermoplastic such as Nylon 12.

Abstract: A multilayer tube comprising at least an inner layer, an intermediate layer, and an outer layer, wherein the intermediate layer is formed by a polyphthalamide.

Abstract: A pipe section for lining sewer pipelines along with a system of such pipe sections and method of lining a sewer pipeline are provided. The pipe section has a first end portion having a spigot. A protective ring is mounted around the spigot for transferring a load to the pipe section for axially moving the pipe section within a sewer pipeline. A second end portion of the pipe section is designed for surrounding the spigot of an adjacent pipe. A seal is formed is formed around the spigot for sealing with the second end portion of the adjacent pipe section.

Abstract: A clad article of a substrate of one powdered metal that is clad with a second dissimilar powdered metal. A separation layer may be provided between the substrate and the clad layer to separate these layers during consolidation and to facilitate bonding thereof. The consolidation operation may be performed by hot isostatic pressing of the powders within a deformable container.

Abstract: The invention relates to a multilayer tank or tubing made of a thermoplastic, comprising at least one layer comprising a barrier resin, adjacent to at least one layer consisting of a blend comprising at least one polyolefin and at least one functionalized polyolefin, and the said functionalized polyolefin of which comprises functional monomeric units chosen from carboxylic acids, dicarboxylic acids and the anhydrides corresponding to the said dicarboxylic acids.

Abstract: A multilayer tubing for conveying liquid, especially motor vehicle fuel in a motor vehicle is extruded with an outer layer composed of nylon 12, an intermediate layer composed of an ethylene vinyl alcohol copolymer and an electrically-conductive inner layer composed of nylon 6 or nylon 12 and compounded with at most 30% by weight of conductive carbon black or graphite fibril.

Abstract: The present invention relates to a method intended for heat insulation of a pipe (1), comprising the following successive stages of depositing, on the outer surface of the pipe moving longitudinally, a thickness (3) of an insulating material made of elastomer having an elastic type behavior, substantially without irreversible plastic deformation, forming at least one circumferential slot (4) in the thickness of the material substantially orthogonally to the axis (2) of the pipe, and coating the insulating material thickness with a sealed sheath. In a variant, the slot is machined in the thickness of the insulant. The invention further relates to a heat-insulated pipe.

Abstract: The invention describes the use of compositions containing at least one thermoplastic polymer and an epoxy resin modified by at least one aromatic polyamine to coat surfaces, especially pipes through which oil is transported. The polymer compositions used contain at least one thermoplastic polymer which is preferably amorphous selected from the group formed by polysulphones, polyetherimides and polyphenylene esters and at least one epoxy resin modified by at least one aromatic polyamine containing at least two primary amine groups in its molecule. Different layers of polymers are deposited on different types of surface, more particularly as internal and external coatings for conduits. The invention also provides a surface coating comprising such compositions. Multi-layer coatings are also produced.

Abstract: A fuel hose which is less permeable to an automotive fuel and highly resistant to a sour gasoline. The fuel hose comprises at least one layer including an innermost layer which comprises a thermoplastic polybutylene terephthalate elastomer containing a dimer acid moiety.

Abstract: Metal-plastic multilayer pipe with a plastic inner pipe (30) and a metal sheath (32) around the plastic inner pipe (30), where the metal sheath (32) is of uniform thickness, is applied to the plastic inner pipe (30) so that it completely encircles the plastic inner pipe (30) and a practical plastic outer layer (38), with the feature that the thickness of the metal sheath (32) as compared to the total thickness of all layers of the multilayer pipe (32, 34 and 38), is sufficiently thin that the metal sheath (32) accounts for a negligible part of the overall strength and stiffness of the multilayer pipe and, as a consequence, when the multilayer pipe is bent in an arc, the metal sheath (32) offers negligible resistance to such bending as compared to the resistance offered by the inner pipe (30) and the practical cover layer (38), and when so bent, the multilayer pipe tends to remain bent in said arc, whereby, the multilayer pipe has “form stability”.

Abstract: A fuel hose wherein an electrically conductive fluororesin is used as an inner layer, and the inside surface thereof is smooth even when it is molded at a high speed, is provided. As the inner layer, a highly melt flowable fluororesin having an electrical conductivity and a melt flow rate of from 14 to 30 (g/10 min), is used to form a fuel hose wherein the inside surface of the inner layer is substantially smooth.

Abstract: An improved coiled air brake tubing is formed from a nylon polyurethane laminate. The laminate includes an innermost nylon layer surrounded with a thick intermediate polyurethane layer in turn covered with an outermost thin nylon layer. The polyurethane layer is fiber reinforced. The product is extruded and coiled around a heated mandril causing it to assume a coiled set. This exhibits improved low temperature properties and is less expensive than a nylon product.

Abstract: A composite pipe includes a polytetrafluoroethylene (PTFE) inner layer and a covering layer of fiber-reinforced plastics material which are joined to one another by force-locking and form-locking through an intermediate layer. The intermediate layer is formed of a PFA layer and a layer of glass or carbon fibers, in order to improve adhesive and shear strength between the PTFE inner layer and the covering layer. The PFA layer is adjacent the PTFE inner layer and the layer of glass or carbon fibers is adjacent the covering layer of fiber-reinforced plastics material.

Abstract: A fuel hose which satisfies low-permeability requirements in conformity with stringent regulations against vapor emission of fuel gases, is halogen-free and has excellent hydrolysis resistance, inter-layer adhesiveness and low-temperature flexibility.

Abstract: An impermeable rubber hose is thinned for the purpose of reducing weight and costs. A rigid resin film is used as an intermediate layer. When the resin film is gradually rolled up into a cylindrical shape from a planar shape and fed to an extrusion head and rubber is simultaneously extrusion-molded inside and outside the cylindrical film, the film produces a break or a twist to make extrusion molding difficult. It is an object of the present invention to make simultaneous extrusion molding possible even in such a condition.

Abstract: A tubular structure exhibiting fuel and vapor impermeability properties for use as a fuel transport hose, wherein the hose is constructed of a polyalkylene terephthalate material or a polyalkylene naphthalate material, wherein the polyalkylene terephthalate or the polyalklyene naphthalate material extends throughout the entire wall structure.

Abstract: The present invention relates to a pressure-resistant hose and forming method thereof, which is capable of effectively spouting liquid or gas of high pressure even though the pressure-resistant hose is of a relatively small thickness, reducing the material cost of the pressure-resistant hose and improving the flexibility of the pressure-resistant hose. The Pressure-resistant hose comprises a first polyethylene mixture and one or more second hose layers. The first hose layer is formed by bonding together longitudinal ends of a first polyethylene mixture fabric coated with one or two watertight films at one or both surfaces of the first polyethylene mixture fabric. Each of said second hose layers if formed by bonding together longitudinal ends of a second polyethylene mixture fabric coated with one or two watertight films at one or both surfaces of the second polyethylene mixture fabric.

Abstract: The present invention relates to a multilayer tube comprising, in its radial direction from the outside inwards:

Abstract: A transport tube for transporting a motor vehicle fluid, in particular a coolant, which tube comprises: an inner layer (1) made of vulcanized elastomer material; an outer layer (2) made of thermoplastic material that withstands the coolant chemically and that is impermeable thereto; and an intermediate bonding layer (3) made of a material that is compatible with the materials of the inner and outer layers.

Abstract: A multi-layer assembly for fluid and vapor handling and containment systems. The multi-layer assembly comprises an extrudable inner layer of polymeric material and a layer of multi-phase polymer of polyamide alloys containing maleic anhydride modified polyolefins surrounding the inner layer.

Abstract: Fuel supply pipe 43 includes a fixed fuel supply pipe 43b that comprises a metal, such as stainless steel, and connecting fuel supply pipes 43a, 43c that comprise a resin or similar material. The bulk resistivity of connecting fuel supply pipes 43a, 43c is chosen to be within the range from 107 to 1011 &OHgr;·cm. By doing this, the amount of electric charge that builds up in the fuel when the fuel passes through connecting fuel supply pipes 43a, 43c can be held low. Further, the electric charge that builds up on connecting fuel supply pipes 43a, 43c is not rapidly discharged. Therefore, spark discharge can be prevented from being generated on connecting fuel supply pipe 43a. Connecting fuel supply pipes 43a, 43c may have a multi-layer structure that includes an innermost layer having a bulk resistivity of 107 to 1011 &OHgr;·cm and an outermost layer having a bulk resistivity of about 1012 &OHgr;·cm or more.

Abstract: A brake hose comprises reinforcing layers in a rubber base. The brake hose comprising an inner tube rubber layer that is made of a rubber material and has a flow path for flowing fluid; a lower yarn layer formed by braiding lower yarn around the inner tube rubber layer; an intermediate rubber layer made of a rubber material and located around the lower yarn layer; an upper yarn layer formed by braiding upper yarn around the intermediate rubber layer; and a cover rubber layer formed around the upper yarn layer. The intermediate rubber layer is formed from a sheet material having a Mooney viscosity of 10-40 Mv (minimum Mooney value) at 145° C.

Abstract: An automotive fuel hose which satisfies low permeability requirements in conformity with stringent regulations against vapor emission of hydrocarbons and alcohol-containing hydrocarbons, and is less permeable to hydrogen and excellent in sour gasoline resistance and inter-layer adhesion. The automotive fuel hose comprises: an inner layer (1) comprising one of a fluororesin and a polyolefin resin; and a low permeability layer (2) comprising a polybutylene naphthalate; the inner layer (1) having a plasma-treated outer peripheral surface (1a); the low permeability layer (2) being provided on the plasma-treated surface (1a) of the inner layer (1).

Abstract: A pipe of layers of thermoplastic polyolefins of the same type, however with different properties, which are connected inseparably with one another, an outer first layer and a second layer, adjoining the first layer on the inside, consisting of a material, which has not been cross-linked, the second layer approximately having the FNCT the value or the NPT value of a one-layer standard pressure pipe and the first layer having an FNCT or NPT value, which is higher by a factor of at least 3 than that of the second value. Moreover, a third layer is provided, which adjoins the second layer on the inside, also consists of material that is not cross-linked and has a PNCT, which is higher by a factor of at least 3 than that of the second layer and an NPT layer, which is higher by a factor of at least 2 than that of the second layer.

Abstract: The present invention relates to a multilayer hose, especially for conveying fuel, comprising an outer layer and a conductive, fluorine-containing, elastomeric inner layer, said inner layer comprising a fluorine-containing elastomer mixed with graphite.

Abstract: A flexible pipe and a method of manufacturing same according to which an inner sheath is surrounded by at least one tensile layer, and an outer sheath of polymeric material consisting of an olefin polymer blended with at least one thermoset elastomer is disposed around the tensile layer.

Abstract: A weldable plastic tube (10) has at least one end designed to be butt welded and designed for the conveyance of a fluid producing a drop in mechanical resistance of said weldable plastic. The tube comprises an internal layer (12) for protection of the plastic of the tube from contact with the fluid conveyed and adjoining said welding end has a terminal section permanently covered with an external reinforcing sleeve (13) also of weldable plastic to participate in the butt welding of the tube. The sleeve has a thickness such as to make the mechanical resistance of the tube section nearest the welded end at least equal to the mechanical resistance of the tube not in contact with the fluid when in contact with the fluid in the welding zone which will be without the internal protective layer.

Abstract: Thermoplastic multilayer composite, particularly in the form of a multilayer hose, a multilayer pipe or a multilayer container, containing at least one intermediate layer made of a molding compound on the basis of ethylene/vinyl alcohol copolymers between layers made of molding compounds on the basis of polyamide, the intermediate layer being bonded via at least one adhesion-promoting layer made of a molding compound on the basis of polyamide selected from the group of copolyamide 6/12, block copolyamide 6/12, polyamide 612, polyamide 610, a mixture of polyamide 6 and polyamide 12 with compatibilizer, a mixture of polyamide 6 and polyamide 11 with compatibilizer, with at least one neighboring layer made of a molding compound on the basis of polyamide 12, polyamide 11, polyamide 1010, polyamide 1012, or polyamide 1212.

Abstract: A detectable liquid leakage conduit characterized by a conduit fitted with a tube which is capable of preventing spillage of liquid from the conduit in the event of a leak. In one embodiment, a leak sensor interposed between the tube and the conduit is electrically connected to a leak detector, whereby leaked fluid in the tube triggers an alarm signal to the leak detector, which alerts personnel to the need for repairing or replacing the conduit.

Abstract: Rubber compositions for hose production having excellent scorch resistance, extrudability, moisture impermeability, weatherability (ozone resistance), and compression set resistance, as well as a hose produced therefrom, and in particular, a refrigerant hose and its production process are provided. More illustratively, a composition comprising (A) a brominated copolymer of an isomonoolefin and a p-alkylstyrene (PMS) wherein PMS content, bromine (Br) content, and Br/PMS weight ratio are within particular ranges; (B) zinc white; and (C) a brominated alkylphenol resin, and a hose wherein such composition is used for the inner tube and/or the outer cover are provided. Also provided are a composition comprising (A) the brominated copolymer rubber and (D) an inorganic laminar compound; a hose produced by using such composition for the inner tube; and a process for producing a refrigerant hose from such a composition by in-die drawing process.

Abstract: A ship including a multi-layer composite piping system formed from a laminated pipe structure comprising: (a) a metal tube; (b) a bonding layer disposed on both sides of the metal tube; and (c) an internally cross-linked polymer layer disposed on both bonding layers.

Abstract: The blow-molded hose of a synthetic resin of the present invention is produced by blow-molding a single parison comprising a soft resin and a hard resin. The blow-molded hose comprises a monolayer (or single-layer) segment formed with either a soft resin layer or a hard resin layer and multilayer laminating) segment formed with the soft resin layer and the hard resin layer, wherein, in the multilayer (laminating) segment, the thickness of the resin layer forming the monolayer segment is thinner than that of the other resin layer. Practically, the monolayer segment comprises the soft resin layer and forms the connection end(s) at the end(s) of the hose.

Abstract: A multilayer fluid conduit for use in motor vehicles includes a first layer and a second layer surrounding the first layer. The two layers are essentially composed of thermoplastic materials and are integrally connected to one another. Electrically conductive particles are mixed into the plastic material of the first layer. For increasing a long-term elasticity and flexibility even at higher temperatures of up to 90° C. when coming into contact with a liquid fuel and fuel vapors, the plastic material of the first layer is a functionalized cross-linked polyolefin or a functionalized cross-linked thermoplastic elastomer.

Abstract: An air handling system ductwork component comprising a tubular, foam interior layer integrally formed with a thin, non-metal outer layer. The combination interior and outer layers are characterized as providing requisite strength for use of the ductwork component within an air handling system without inclusion of a metal-based layer. In one preferred embodiment, the interior layer is a closed cell foam, and the outer layer is plastic, with the ductwork component being formed as part of a rotational molding process. The ductwork component can assume a wide variety of forms, such as a duct, pipe, elbow, boot, tee, plenum, reducer, register, wall stack, take-off, etc.

Abstract: A tubular structure exhibiting fuel and vapor impermeability properties for use as a fuel transport hose, wherein the hose is constructed of a polyalkylene terephthalate material or a polyalkylene naphthalate material, wherein the polyalkylene terephthalate or the polyalklyene naphthalate material extends throughout the entire wall structure.

Abstract: To provide a multiple coat metal pipe and its fabrication method having excellent corrosion resistance without deteriorating chipping resistance or splashing resistance, capable of being fabricated easily and capable of simply carrying out peel off operation owing to a weak peel off strength wherein corrosion resistance of an end working portion is not deteriorated, there is provided a multiple coat metal pipe which is a metal pipe constituted by multiplexing and coating a first layer including a resin having an adhesive force in respect of a surface treatment layer formed on an outer peripheral face of the metal pipe and capable of being extruded and a second layer provided on an outer peripheral face of the first layer, having a chipping resistance and capable of being extruded, wherein a peel off strength between the first layer and the second layer is 75 g/cm or less.

Abstract: A vibration absorbing rubber hose having a laminar structure including an inner rubber layer, a reinforcing layer, and an outer rubber layer, which layers are laminated integrally with one another in the order of description in a radially outward direction of the rubber hose, wherein the inner rubber layer is formed of a butyl rubber material and/or a halogenated butyl rubber material while the outer rubber layer is formed of an EPM material consisting of ethylene-propylene copolymer.

Abstract: The invention is an insulation material comprising a novolac cured polysulfide polymer resin. The material is used as a thermal insulator for subsea gas and oil production equipment, such as pipes and wellhead equipment. In order to decrease the maximum exothermic temperature generated by the resin during curing, hollow glass beads are added to the resin. The amine content of the hardener in a standard resin was adjusted to further decrease the maximum exothermic temperature. A fumed silica thixotropic material was also added to increase the viscosity of the mixture. These modifications allow the material to be cast in thick sections without cracking, leaking, or excessive expansion during curing.

Abstract: A hose or flexible pipe (100,200) which has an inner lining (116; 216) composed of fluoropolymer. This gives the hose an improved capacity to withstand high temperatures, chemical degradation and embrittlement along with flexibility and light weight. The hose wall structure (102) is preferably fully bonded to improve support for the fluoropolymer lining (116; 216). The fluoropolymer lining (116; 216) also makes practicable the use of rubbers having the ability to withstand high temperatures.