WO2011022124A1 - Energy dissipative tubes, sealing devices, and methods of fabricating and installing the same - Google Patents
Energy dissipative tubes, sealing devices, and methods of fabricating and installing the same Download PDFInfo
- Publication number
- WO2011022124A1 WO2011022124A1 PCT/US2010/040744 US2010040744W WO2011022124A1 WO 2011022124 A1 WO2011022124 A1 WO 2011022124A1 US 2010040744 W US2010040744 W US 2010040744W WO 2011022124 A1 WO2011022124 A1 WO 2011022124A1
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- WIPO (PCT)
- Prior art keywords
- tubing
- resin layer
- energy dissipative
- sealing device
- layer
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/08—Machines for placing washers, circlips, or the like on bolts or other members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/04—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection
- F16L19/041—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection the ring being an insert
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0462—Tubings, i.e. having a closed section
- H02G3/0468—Corrugated
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0462—Tubings, i.e. having a closed section
- H02G3/0481—Tubings, i.e. having a closed section with a circular cross-section
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- the present invention relates to gas, liquid, and slurry piping systems as well as protective conduit systems for cable carrying purposes, and more particularly to piping or tubing systems incorporating jackets and fittings capable of transferring and dissipating energy.
- CSST corrugated stainless steel tubing
- Such piping systems can be designed for use in combination with elevated pressures of up to about 25 psi or more and provide advantages over traditional rigid black iron piping systems in terms of ease and speed of installation, elimination of onsite measuring, and reduction in the need for certain fittings such as elbows, tees, and couplings.
- the thin metal walls are vulnerable to failure when exposed to physical or electrical forces, such as lightning or fault currents.
- fault current is typically used to describe an overload in an electrical system, but is used broadly herein to include any electrical current that is not normal in a specific system. These currents can be the result of any number of situations or events such as a lightning event. Electrical currents from lightning can reach a structure directly or indirectly. Direct currents result from lightning that attaches to the actual structure or a system contained within the structure. When current from a nearby lightning stroke moves through the ground or other conductors into a structure, it is referred to as indirect current.
- One aspect of the invention provides an energy dissipative tube including: a length of tubing; a first resin layer surrounding the outside of the tubing; an expanded metal foil adjacent to the outside of the first resin layer; and a second resin layer surrounding the expanded metal foil and the first resin layer.
- the first resin layer can include one or more materials selected from the group consisting of: a polymer, a thermoplastic polymer, and a thermoset polymer.
- the second resin layer can include one or more materials selected from the group consisting of: a polymer, a
- thermoplastic polymer and a thermoset polymer.
- the first resin layer can be electrically conductive.
- the first resin layer can have a volume resistivity of less than about 10 6 ohm-cm.
- the first resin layer can be electrically insulative.
- the second resin layer can be electrically conductive.
- the second resin layer can have a volume resistivity of less than about 10 6 ohm-cm.
- the second resin layer can be electrically insulative.
- the expanded metal foil can completely surround the first resin layer.
- the expanded metal foil can substantially surround the first resin layer.
- the tubing can be metallic tubing.
- the tubing can be thin-walled tubing.
- the tubing can be flexible tubing.
- the tubing can be corrugated tubing.
- Another aspect of the invention provides an energy dissipative tube including: a length of tubing; a conductive layer adjacent to the outside of the tubing; and an insulative layer adjacent to the conductive layer.
- the conductive layer can include a metal.
- the metal can be a foil.
- the metal can be an expanded foil.
- the metal can be a perforated foil.
- the metal can be a metal tape.
- the metal can be a perforated metal tape.
- the metal can include one or more wires.
- the wires can be formed into a mesh.
- the one or more wires can be braided.
- the metal can include one or more selected from the group consisting of: copper, aluminum, silver, and gold.
- the conductive layer can have a higher electrical conductivity than the tubing.
- the tubing can be corrugated tubing.
- the conductive layer can be a conductive resin.
- the conductive resin can have a volume resistivity of less than about 10 6 ohm-cm.
- Another aspect of the invention provides an energy dissipative tube including: a length of tubing; a metal layer adjacent to the outside of the tubing; and a resin layer adjacent to the metal layer.
- the metal layer can be an expanded foil.
- the resin can be a conductive resin.
- the conductive resin can have a volume resistivity of less than about 10 6 ohm-cm.
- the resin can be an insulative resin.
- Another aspect of the invention provides an energy dissipative tube including: a length of tubing; a resin layer adjacent to the outside of the tubing; and a metal layer adjacent to the resin layer.
- Another aspect of the invention provides a method of fabricating energy dissipative tubing.
- the method includes: providing a length of tubing; applying a first resin layer surrounding the outside of the tubing; applying an expanded metal foil adjacent to the outside of the first resin layer; and applying a second resin layer surrounding the expanded metal foil and the first resin layer.
- Another aspect of the invention provides a method of fabricating energy dissipative tubing.
- the method includes: providing a length of tubing; applying a conductive layer adjacent to the outside of the tubing; and applying an insulative layer adjacent to the conductive layer.
- Another aspect of the invention provides a method of installing energy dissipative tubing.
- the method includes: providing a length of energy dissipative tubing including a length of tubing, a first resin layer surrounding the outside of the tubing, an expanded metal foil adjacent to the outside of the first resin layer, and a second resin layer surrounding the expanded metal foil and the first resin layer; and coupling a fitting to an end of the energy dissipative tubing. The fitting creates electrical continuity with the expanded metal foil.
- Another aspect of the invention provides a method of installing energy dissipative tubing.
- the method includes: providing a length of energy dissipative tubing including a length of tubing, a conductive layer adjacent to the outside of the tubing, and an insulative layer adjacent to the conductive layer; and coupling a fitting to an end of the energy dissipative tubing.
- the fitting creates electrical continuity with the conductive layer.
- Another aspect of the invention provides a sealing device for connecting an energy dissipative tube having a length of tubing, a first resin layer surrounding the outside of the tubing, a conductive layer adjacent to the outside of the first resin layer, and a second resin layer surrounding the conductive layer and the first resin layer.
- the sealing device includes one or more penetrating members configured to penetrate the second resin layer and establish electrical continuity with the conductive layer.
- the one or more penetrating members do not penetrate the first resin layer. In another embodiment, the one or more penetrating members do not establish electrical continuity with the tubing. In still another embodiment, the one or more penetrating members are substantially triangular. In yet another embodiment, the one or more penetrating members are formed on a split bushing.
- the one or more penetrating members can extend circumferentially around the split bushing.
- the one or more penetrating members can include at least one radial cutting edge.
- the one or more penetrating members can include at least one tangential cutting edge.
- the sealing device of claim can include a sleeve portion.
- the split bushing can be received within the sleeve portion.
- the exterior of the sleeve portion can include one or more threads.
- the sealing device can include a nut operably connected to the one or more threads on the exterior of the sleeve portion.
- the nut can be configured to advance the bushing when the nut is tightened.
- the split bushing can have a geometry that interacts with the sleeve portion to facilitate penetrating the second resin layer and establishing electrical continuity with the conductive layer.
- the split bushing can be metallic.
- the split bushing can be brass.
- the one or more penetrating members can be metallic.
- the sealing device can be configured to form a seal with one end of the length of tubing and wherein electrical continuity is established between the sealing device and the end of the length of tubing.
- Another aspect of the invention provides a sealing device for connecting an energy dissipative tube having a length of tubing, a first resin layer surrounding the outside of the tubing, a conductive layer adjacent to the outside of the first resin layer, and a second resin layer surrounding the conductive layer and the first resin layer.
- the sealing device includes: a body member including a sleeve portion and a bushing arranged to be received in the sleeve portion.
- the bushing includes one or more penetrating members configured to penetrate the second resin layer and establish electrical continuity with the conductive layer.
- the bushing can be a split bushing.
- the split bushing can be configured to penetrate the second resin layer substantially radially.
- the split bushing can be configured to penetrate the second resin layer substantially tangentially.
- the exterior of the sleeve portion can include one or more threads.
- the sealing device can include a nut operably connected to the one or more threads on the exterior of the sleeve portion. The nut is arranged to advance the bushing when the nut is tightened.
- Another aspect of the invention provides a method of installing energy dissipative tubing.
- the method includes: providing a length of energy dissipative tubing including a length of tubing, a first resin layer surrounding the outside of the tubing, an expanded metal foil adjacent to the outside of the first resin layer, and a second resin layer surrounding the expanded metal foil and the first resin layer; and coupling a sealing device to an end of the energy dissipative tubing.
- the sealing device includes one or more penetrating members configured to penetrate the second resin layer and establish electrical continuity with the expanded metal foil.
- the one or more penetrating members are arranged on a split bushing.
- FIG. 1 depicts a multi-layer jacketed tube in accordance with the prior art.
- FIG. 3A depicts an expanded metal foil in accordance with a preferred embodiment of the invention.
- FIG. 3B depicts a nomenclature for expanded metal foils in accordance with a preferred embodiment of the invention.
- FIGS. 4A and 4B depict energy dissipative tubes in accordance with alternate preferred embodiments of the invention.
- FIG. 5 depicts an energy dissipative smooth bore tube in accordance with a preferred embodiment of the invention.
- FIG. 6 depicts a method of fabricating an energy dissipative tube in accordance with the subject invention.
- FIG. 7 depicts a method of installing an energy dissipative tube in accordance with the subject invention.
- FIG. 8 depicts a system for testing tubing and conduit in accordance with a preferred embodiment of the subject invention.
- FIG. 9A is a compilation of four photographs of energy dissipative tubing in accordance with a preferred embodiment of the invention after exposure to electricity in accordance with the SAE ARP5412 standard.
- FIG. 9B is a photograph of tubing coated with a conductive resin after exposure to electricity in accordance with the SAE ARP5412 standard.
- FIG. 10 depicts a sealing device according to a preferred embodiment of the subject invention.
- FIGS. 1 IA and 1 IB depict a split bushing useful in the sealing device of
- FIG. 12 depicts a method of installing energy dissipative tubing in accordance with the subject invention.
- corrugated stainless steel tubing and “CSST” refer to any type of tubing or piping, which may accommodate corrosive or aggressive gases or liquids, and includes but is not limited to tubing or piping made from:
- thermoplastics metal or metal alloy materials such as olefin-based plastics (e.g., polyethylene (PE)), fluorocarbon polymers (e.g., polytetrafluoroethylene (PTFE)), carbon steel, copper, brass, aluminum, titanium, nickel, and alloys thereof.
- PE polyethylene
- PTFE polytetrafluoroethylene
- Tubing having an energy dissipative jacket and methods for fabricating and installing the same are disclosed.
- the corrugated tubing 2 may be composed of stainless steel or any other suitable material.
- the tubing 2 contains a number of corrugation peaks 4 and corrugation valleys 6.
- a jacket 8 (e.g., a multi-layer jacket) covers the outside of the tubing 2.
- the jacket 8 can include a plurality of layers 10, 12.
- the layers 10, 12 generally form an annulus around the tubing 2, but may have a circular or non- circular cross-section.
- energy dissipative jackets 8 are provided that dissipate electrical and thermal energy throughout the respective jackets 8, thereby protecting the tubing 2.
- the term “dissipate” encompasses distributing electrical energy to an appropriate grounding device such as a fitting.
- Preferred embodiments of energy dissipative jackets preferably include one or more conductive layers for distributing electricity and heat.
- the conductive layers can include, for example, conductive resins and/or metals as discussed herein.
- the energy dissipative tubing 20a includes a length of tubing 22.
- the tubing 22 can be metal tubing, thin- walled metal tubing, corrugated tubing, corrugated stainless steel tubing, or the like.
- Tubing 22 is surrounded by a first resin layer 24, a metal layer 26a, and a second resin layer 28.
- Resin layers 24, 28 can be formed from insulative and/or conductive resins.
- Insulating resin layers can be formed from a variety of materials.
- an insulating elastic layer includes polytetrafluoroethylene (PTFE).
- PTFE polytetrafluoroethylene
- Other suitable insulators include polyolefin compounds, thermoplastic polymers, thermoset polymers, polymer compounds, polyethylene, crosslinked polyethylene, UV-resistant polyethylene, ethylene-propylene rubber, silicone rubber, polyvinyl chloride (PVC), ethylene tetrafluoroethylene (ETFE), and ethylene propylene diene monomer (EPDM) rubber.
- PVC polyvinyl chloride
- ETFE ethylene tetrafluoroethylene
- EPDM ethylene propylene diene monomer
- Conductive resin layers can be formed by impregnating a resin with conductive material such as metal particles (e.g., copper, aluminum, gold, silver, nickel, and the like), carbon black, carbon fibers, or other conductive additives.
- conductive material such as metal particles (e.g., copper, aluminum, gold, silver, nickel, and the like), carbon black, carbon fibers, or other conductive additives.
- the metal layer 26 and/or one or more of the resin layers 24, 28 has a higher electrical conductivity than the tubing 22.
- the volume resistivity of the conductive resin can be less than about 10 6 ohm-cm
- each resin layer 24, 28 has a thickness of about 0.015" to about 0.035".
- Metal layer 26 can include one or more metals (e.g., ductile metals) such as aluminum, cadmium, niobium (also known as “columbium”), copper, gold, nickel, platinum, silver, tantalum, titanium, zinc, zirconium, and the like and alloys thereof (e.g., austentitic nickel-chromium-based superalloys, brass, low carbon steel, phosphor bronze, stainless steel, and the like).
- the metal(s) can be formed into foils, perforated foils, tapes, perforated tapes, cables, wires, strands, meshes, braids, and the like.
- the metal layer 26 is an expanded metal foil.
- expanded metal foils are available from the Dexmet Corporation of Wallingford, Connecticut.
- FIGS. 2A-2D Several exemplary embodiments of energy dissipative tubing 20 with various expanded metal foils are depicted in FIGS. 2A-2D.
- Expanded metal foils are particularly advantageous because they provide uniform protection while minimizing weight and allowing for flexibility of the tubing 20.
- the expanded metal foil will either stretch or break on the outside of the bend. In either case, a continuous path is still maintained in the inside of the bend to allow for energy to be dissipated.
- the expanded metal foil can be designed to not break on the outside of a bend with an appropriate design based on specified bend radii.
- expanded or perforated metal foils include a plurality of voids.
- the voids can be formed in a variety of shapes including circles, ellipses, triangles, quadrilaterals, rectangles, squares, trapezoids, parallelograms, rhombuses, pentagons, hexagons, heptagons, octagons, nonagons, decagons, ra-gons, and the like.
- the voids can be formed through a variety of techniques. For example, a plurality of foils or wires can be assembled in a parallel formation and bonded at regular intervals before the bonded assembly is stretched laterally to form voids between the non- bonded portions of the foils or wires.
- the voids can be created with a mechanical device (e.g., dies, drills, punches, molds, and the like), chemical means (e.g., chemical etching, photochemical etching, and the like), and/or electrical means (e.g., electrical discharge machining and the like).
- a mechanical device e.g., dies, drills, punches, molds, and the like
- chemical means e.g., chemical etching, photochemical etching, and the like
- electrical means e.g., electrical discharge machining and the like.
- the metal layer 26 completely surrounds the first resin layer 24. In such embodiments, the metal may overlap and/or be welded or soldered in some regions. In other embodiments, the metal layer 26 substantially surrounds the first resin layer 24. In such embodiments, a small portion of the first resin layer 24 (e.g., less than about 1°, less than about 2°, less than about 3°, less than about 4°, less than about 5°, less than about 10°, less than about 15°, less than about 20°, and the like) is not surrounded by the metal layer 26. In still other embodiments, the metal layer 26 can be wrapped spirally or helically around the first resin layer 24. In such an embodiment, the metal layer 26 can overlap or substantially surround the first resin layer 24
- the resin layers 24, 28 and the metal layer 26 can be selected to achieve desired resistance to lightning strikes and physical damage while maintaining desired levels of flexibility.
- the mass per area can be adjusted to provide an appropriate amount of energy dissipation.
- the resin layers 24, 28 can be the same or different thickness and can include the same or different materials.
- Various colors or markings can be added to resin layers, for example, to clearly distinguish the resin layers 24, 28 from each other and from the metal layer 26 and/or to make the tubing 20 more conspicuous.
- the expanded metal foil 26a has a plurality of rhombus- shaped voids (e.g., rhombuses with internal angles of approximately 80° and approximately 100°).
- the expanded metal foil 26b again has a plurality of rhombus- shaped voids.
- Expanded metal foil 26b differs from expanded metal foil 26a by the lengthening of the voids 26b.
- the voids can be rhombuses with internal angles of approximately 70° and approximately 110°.
- the expanded metal foil 26c resembles to the expanded metal foil 26b in FIG.
- the expanded metal foil 26d again has a plurality of rhombus-shaped voids.
- the expanded metal foil 26d is wider between the voids and the rhombus- shaped voids approach square- shaped voids with internal angles of approximately 85° and approximately 95°.
- the metal layer 26 has a thickness between
- the metal layer 26 has a mass per square foot between about 0.045 and about 0.070 pounds per square foot.
- Dexmet Corporation are specified by product codes illustrated by FIG. 3B in the context of FIG. 3A.
- the first number in the product code indicates the base material thickness in thousandths of inches.
- the letters indicate the chemical symbol of the material.
- the second numbers indicate the strand width in thousandths of inches.
- the third number indicates the length of the long axis of the void or diamond in thousandths of inches.
- the second letters indicate post-production processing of the expanded metal foil.
- the letter “F” indicates that the expanded metal foil is flattened.
- the letter “A” indicates that the expanded metal foil is annealed.
- a variety of expanded metal foils are suitable for use in embodiments of the invention
- the energy dissipative tubing 40a includes a length of tubing 42a surrounded by a metal layer 44a and a resin layer 46a.
- Metal layer 44a and resin layer 46a can include the same or similar materials described in the context of FIGS . 2A-2D herein.
- the energy dissipative tubing 40b includes a length of tubing 42b surrounded by a resin layer 46b and a metal layer 44b.
- Metal layer 44b and resin layer 46b can include the same or similar materials described in the context of FIGS. 2A-2D herein.
- one or more layers positioned adjacent to the tubing 2, 22, 42, 52 are conductive.
- conductive layers can better protect thin-walled tubing 2, 22, 42, 52 by substantially evenly distributing electricity throughout the tubing 2, 22, 42, 52 and/or by providing sacrificial means to transfer and dissipate the electrical energy.
- insulative layers resist electrical energy until the potential difference between the inner conductive tubing and another conductive element is large enough to create a dielectric breakdown of the insulative layer thereby allowing electrical energy to enter through the compromised insulative layer and on to the thin- walled tubing 2, 22, 42, 52 at a single point and damaging the thin-walled tubing 2, 22, 42, 52.
- the entire jacket is conductive.
- tubing 22 can be surrounded by a first conductive resin layer 24, a metallic layer 26, and a second conductive layer 28.
- both energy dissipative corrugated or smooth bore tubing can be used to transport gases, liquids, and slurries.
- the particular configuration of energy dissipative conduits 50 can vary in compliance with various regulations (e.g., the National Electrical Code as published by the National Fire Protection Association and promulgated by various municipalities).
- the internal tube 52 is corrugated tubing as depicted in FIGS. 2A-2D.
- the internal tube 52 is a smooth bore tube as depicted in FIG. 5.
- Tube 52 can be conventional conduit such as rigid metal conduit (RMC), rigid nonmetallic conduit (RNC), galvanized rigid conduit (GRC), electrical metallic tubing (EMT), electrical nonmetallic tubing (ENT), flexible metallic conduit (FMC), liquidtight flexible metal conduit (LFMC), flexible metallic tubing (FMT), liquidtight flexible nonmetallic conduit (LFNC), aluminum conduit, intermediate metal conduit (IMC), PVC conduit, and the like.
- RMC rigid metal conduit
- RMC rigid nonmetallic conduit
- GRC galvanized rigid conduit
- EMT electrical metallic tubing
- ENT electrical nonmetallic tubing
- FMC flexible metallic conduit
- LFMC liquidtight flexible metal conduit
- FMT flexible metallic tubing
- LFNC liquidtight flexible nonmetallic conduit
- IMC intermediate metal conduit
- PVC conduit and the like.
- an internal tube 52 is omitted.
- inner tube 52 can be enclosed in one or more resin layers 54, 58 and one or more metal layers 56.
- one or more layers of the jacket possess various properties such as flame resistance, heat resistance, sound insulation, temperature insulation, oil or water impermeability, and/or wear resistance.
- a layer may incorporate a fire retardant.
- Suitable layers include polymers incorporating about 20% to 60% magnesium hydroxide, aluminum trihydrate, and/or halogenated fire retardants by weight.
- one or more of the resin layers have a 25/50 flame spread / smoke density index as measured in accordance with the ASTM E84 standard.
- resin layers are capable of elongation greater than or equal to about 200% as measured in accordance with the ASTM D638 standard.
- the outer layer includes wear resistant materials such as wire, cable, strands of material such as poly-aramid synthetic fiber such as
- KEVLAR® (available from E.I. Du Pont de Nemours and Company of Wilmington, Delaware), and the like. Such materials may be incorporated within a polymer or resin layer or may be exposed. In some embodiments, a layer is formed by twisting an interlocking metal strip around the tubing and underlying jacket layers similar to the metal sheath on BX or TECK type electrical cables.
- Energy dissipative tubing can be fabricated in accordance with existing techniques for the manufacture of CSST.
- An exemplary method 60 for fabricating energy dissipative tubing is depicted in FIG. 6.
- a length of tubing is provided.
- the tubing can be metal tubing, thin-walled metal tubing, corrugated tubing, corrugated stainless steel tubing, and the like. Embodiments of suitable tubing are described herein.
- a resin layer is applied to the exterior of the tubing (and any intervening jacket layers).
- the resin layer can be applied by known extrusion techniques.
- a metal layer is applied to the exterior of the tubing (and any intervening jacket layers).
- the metal layer can be applied by a variety of techniques. Foils, tapes, wires, and the like can be wound onto the tubing.
- an adhesive e.g., an electrically conductive adhesive
- Braids and meshes can be formed by various known techniques in the rope-, wire-, and cable-making fields.
- steps S64 and S66 can be repeated in variety of patterns. For example, consecutive resin and/or metal layers can be applied to the tubing.
- the metal layer is embedded or partially embedded in one or both of the resin layers. This can be accomplished by pressing the metal layer into the resin layer while the resin is curing. In other embodiments, the metal is applied over a cured resin layer (e.g., to aid in easy removal of the metal layer for installation and/or recycling).
- Energy dissipative tubing can be installed in accordance with existing techniques for the manufacture of CSST.
- An exemplary method 70 for installing energy dissipative tubing is depicted in FIG. 7.
- a length of energy dissipative tubing is provided.
- Tubing may be provided in lengths (e.g., 8' sticks) or on reels.
- one or more jacket layers are optionally removed in accordance with the instructions for a fitting.
- the one or more layers can be removed with existing tools such as a utility knife, a razor blade, a tubing cutter, and the like.
- the fitting is coupled to the tubing in accordance with the instructions for the fitting.
- the fitting may, in some embodiments, contact one or more conductive layers (e.g., conductive resin layers or metal layers) to create electrical continuity between the conductive layer(s) and the fitting, thereby grounding the conductive layer(s).
- the fitting can include one or more conductive teeth that penetrate an outer resin layer to ground the metal layer.
- a schematic of the testing apparatus 80 is provided in FIG. 8.
- a length of tubing 82 (including any metallic layers) is connected to power source 84.
- Tubing 82 can be any tubing or conduit described herein or can be other tubing for use as a control during testing.
- the power source 84 can, in some embodiments, contain three energy storage capacitors/battery banks that are capable of producing the waveforms described as current components A/D, B, and C in SAE Standard No. ARP5412 discussed above.
- Ground plate 86 contacts or is in close proximity to tubing 82 at contact point 88.
- capacitors/battery banks A/D, B, C are discharged at the same time. The electricity arcs through any resin layers at contact point 88 and flows to ground plate 86.
- samples A and C lengths of tubing (Samples A and C) including a layer of 8AL19-125F MICROGRID® expanded metal foil, available from Dexmet Corporation, and a length of conventional tubing (Sample B) coated with a conductive resin were exposed to A/D, B, C electrical current waveforms in accordance with SAE ARP5412.
- FIGS. 9A and 9B clearly demonstrate the effectiveness of the energy dissipating layers described herein.
- FIG. 9A depicts Sample A.
- FIG. 9A(I) a portion of the outer resin layer is ablated. Further removal of the outer resin layer in FIG. 9A(2) clearly shows the vaporization of a portion of the energy dissipating layer, protecting the inner resin layer and the corrugated tubing.
- FIG. 9A(3) shows the extent of vaporization.
- FIG. 9A(4) a portion of the inner resin layer is removed to demonstrate that although the corrugated tubing is slightly deformed, the corrugated tubing is still intact.
- FIG. 9B depicts Sample B, which catastrophically failed and was completely separated into two pieces.
- a sealing device 1000 is provided for energy dissipative tubing 1002.
- the sealing device 1000 can include a body (or
- the energy dissipative tubing 1002 can be any tubing configured to dissipate electrical energy. Various examples of energy dissipative tubing 1002 are described herein. In one example depicted in FIG. 10, the energy dissipative tubing 1002 includes a length of tubing 1008 (e.g., corrugated stainless steel tubing), a first resin layer 1010 adjacent to the tubing 1008, a conductive layer 1012 adjacent to the first resin layer 1010, and a second resin layer 1014 adjacent to the conductive layer 1012.
- tubing 1008 e.g., corrugated stainless steel tubing
- the sealing device 1000 includes one or more penetrating members 1016 configured to penetrate the second (or exterior) resin layer 1014 and establish electrical continuity with the conductive layer 1012.
- penetrate encompasses situations in which the penetrating member 1016 does not completely pierce the second resin layer 1014, but does penetrate the second resin layer 1014 sufficiently so that electrical continuity is established across the partially-penetrated second resin layer 1014.
- Penetrating members 1016 can be arranged in a variety of configurations.
- the penetrating members 1016 can be one or more teeth.
- the penetrating members can be a protrusion arranged on a split bushing 1018.
- the penetrating members 1016 disclosed in the embodiment of FIG. 10 provide a plurality of cutting surfaces as further described in the context of FIGS. 1 IA and 1 IB.
- FIG. HA depicts an exploded view of a split bushing 1100 around
- the split bushing 1100 includes one or more components 1104 (e.g., two 180° sectors).
- One or more of the bushing components 1104 can include a penetrating member 1106 configured to penetrate one or more layers of the energy dissipative tubing 1102.
- components 1104a and 1104b include circumferential penetrating members 1106a and 1106b, respectively.
- the penetrating members 1106a, 1106b extend continuously around the inner surface of the components 1104a, 1104b, the penetrating members 1106 can, in other embodiments, be discontinuous.
- one or more penetrating members e.g. , teeth or the like
- the split bushing 1018, 1100 described herein is particularly advantageous because it is arranged to penetrate one or more layers of the energy dissipative tubing in two directions, thereby providing more robust and predictable electrical continuity with the conductive layer 1012.
- split bushing components 1104a, 1104b are compressed (i.e., pushed together)
- the penetrating member 1106 presses radially against the second resin layer 1014 to substantially uniformly penetrate the second resin layer 1014.
- the ends 1108 of the penetrating members 1106 cut substantially tangentially across the second resin layer to establish further electrical continuity with the conductive layer 1012.
- the tangential cutting path is illustrated by dashed lines in FIG. HA.
- the split bushing 1018, 1100 and the penetrating members 1106 can be configured to penetrate certain layers of energy dissipative tubing 1002 and can be further optimized to reflect the specific thicknesses and materials of various embodiments of energy dissipative tubing 1002 and to withstand certain levels of electrical and/or thermal energy.
- the penetrating members 1106 can be configured to penetrate certain layers of energy dissipative tubing 1002 and can be further optimized to reflect the specific thicknesses and materials of various embodiments of energy dissipative tubing 1002 and to withstand certain levels of electrical and/or thermal energy.
- the penetrating members 1106 can be configured to penetrate certain layers of energy dissipative tubing 1002 and can be further optimized to reflect the specific thicknesses and materials of various embodiments of energy dissipative tubing 1002 and to withstand certain levels of electrical and/or thermal energy.
- the penetrating members 1106 can be configured to penetrate certain layers of energy dissipative tubing 1002 and can be further optimized
- the penetrating members 1106 can be configured to penetrate only the second (or exterior) resin layer 1014. In other embodiments, the penetrating members 1106 can penetrate the second (or exterior) resin layer 1014, and partially or fully penetrate the conductive layer 1012 in order to establish better electrical continuity. In still another
- the penetrating member 1106 can penetrate all layers of the energy dissipative tubing 1002 including the first (or inner) resin layer 1010, and is in contact or in proximity to the tubing 1008 to form electrical continuity with the tubing 1008 in addition to conductive layer 1012. Alternatively or additionally, electrical continuity can be established with the tubing 1008 through a metallic sealing face 1028.
- the penetrating members 1016, 1106 can be beveled and/or sharpened to better penetrate the desired layers 1010, 1012, 1014.
- the penetrating members 1016, 1106 can be triangular- shaped protrusions as depicted in
- the split bushing 1018 and the sleeve portion 1006 can be configured to compress the split bushing 1018 as the split bushing is advanced towards a proximal end 1020 of the sealing device 1000.
- the split bushing 1018 can include an enlarged diameter region 1022, 1110 configured to interact with a tapered interior of sleeve portion 1006 to provide substantially uniform compression of split bushing 1018 as the split bushing is advanced proximally.
- the split bushing 1018 can be advanced proximally through a variety of techniques and components.
- the split bushing 1018 can be engaged by a tool and advanced proximally until the split bushing 1018 is held within the sleeve portion 1006 by friction, locking members, and/or retention members as described in International Publication No. WO 2008/150449.
- an exterior of the sleeve portion 1006 can be threaded in order to mate with a nut 1024. As the nut 1024 is tightened, the split bushing 1018 is advanced proximally to compress the split bushing 1018.
- the split bushing 1018 also forms a seal between the tubing 1008 and the sealing device 1000.
- a seal can be a metal-to-metal seal formed by collapsing and compressing a first corrugation 1026 against a sealing face 1028.
- the principles and various embodiments of such sealing devices are described in publications such as International Publication Nos. WO 2008/150449 and WO 2008/150469, which are incorporated by reference herein.
- split bushing 1018 can also be applied to various other mechanical devices such as multi-segment bushings, collets, split rings, and the like.
- a proximal end 1020 can be configured for coupling with various fittings, pipes (e.g., black iron pipe), appliances and the like.
- the proximal end 1020 can include male or female threads, for example in accordance with the American National Standard Taper Pipe Thread (NPT) standard, which is discussed, for example, at Erik Oberg et al., Machinery's Handbook 1861-65 (28th ed. 2008).
- NPT American National Standard Taper Pipe Thread
- the proximal end is sized for a sweat/solder connection or a compression connection.
- the sealing device is configured to couple two lengths of the energy dissipative tubing 1002 having the sleeve portions 1006 on both ends for receiving the split bushings 1006 and the energy dissipative tubing 1002.
- the sealing device 1000, split bushing 1018, and/or nut 1024 can be fabricated from materials such as metals (e.g., iron, copper, aluminum, gold, silver, and the like), metal alloys (e.g., brass, bronze, steel, and the like), plastics, polymers, elastomers, and the like.
- metals e.g., iron, copper, aluminum, gold, silver, and the like
- metal alloys e.g., brass, bronze, steel, and the like
- plastics e.g., polymers, elastomers, and the like.
- the sealing device 1000, split bushing 1018, and/or nut 1024 are fabricated from conductive materials in order to provide a conductive path between the energy dissipative tubing 1002 to a grounding conductor (e.g., a fitting, a pipe, an appliance, a grounding wire, and the like).
- grounding conductor e.g., a fitting, a pipe, an appliance,
- a method 1200 of installing energy dissipative tubing is provided.
- a length of energy dissipative tubing is provided.
- the energy dissipative tubing can be the same or similar to the energy dissipative tubing described herein.
- the energy dissipative tubing can include a length of tubing (e.g., corrugated stainless steel tubing), a first resin layer adjacent to the tubing, a conductive layer adjacent to the first resin layer, and a second resin layer adjacent to the conductive layer.
- a sealing device is coupled to the end of the energy dissipative tubing.
- the sealing device can include one or more penetrating members configured to penetrate the second resin layer and establish electrical continuity with the conductive layer.
- the coupling step S 1204 can include a variety of sub-steps.
- one or more jacket layers can be removed (e.g., with a utility knife, a razor blade, a tubing cutter, and the like) to expose one or more corrugations.
- a split bushing can be placed over the energy dissipative tubing.
- the split bushing can be provided within a sleeve portion of the sealing device and removed by the installer or can be provided outside of the sealing device.
- the assembled tubing and split bushing can then be inserted into a sleeve portion of the sealing device in step S 1208b.
- step S 1208c the energy dissipative tubing is inserted into the split bushing without removing the split bushing from the sealing device.
- step S 1210 the split bushing is compressed.
- the split bushing can be compressed as it is proximally advanced within the sleeve portion as discussed herein. As further discussed herein, the split bushing can be advanced through the use of a tool or by tightening of a nut.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Gasket Seals (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10810329.2A EP2467916A4 (en) | 2009-08-21 | 2010-07-01 | Energy dissipative tubes, sealing devices, and methods of fabricating and installing the same |
NZ598018A NZ598018A (en) | 2009-08-21 | 2010-07-01 | Energy dissipative tubes, sealing devices, and methods of fabricating and installing the same |
CA2771377A CA2771377C (en) | 2009-08-21 | 2010-07-01 | Energy dissipative tubes, sealing devices, and methods of fabricating and installing the same |
BR112012003882A BR112012003882A2 (en) | 2009-08-21 | 2010-07-01 | power dissipator pipe, power dissipator pipe manufacturing methods, installation method and sealing devices for a power dissipator |
AU2010284564A AU2010284564A1 (en) | 2009-08-21 | 2010-07-01 | Energy dissipative tubes, sealing devices, and methods of fabricating and installing the same |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US23591009P | 2009-08-21 | 2009-08-21 | |
US61/235,910 | 2009-08-21 | ||
US32168910P | 2010-04-07 | 2010-04-07 | |
US61/321,689 | 2010-04-07 |
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WO2011022124A1 true WO2011022124A1 (en) | 2011-02-24 |
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PCT/US2010/040744 WO2011022124A1 (en) | 2009-08-21 | 2010-07-01 | Energy dissipative tubes, sealing devices, and methods of fabricating and installing the same |
Country Status (7)
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US (5) | US8399767B2 (en) |
EP (1) | EP2467916A4 (en) |
AU (1) | AU2010284564A1 (en) |
BR (1) | BR112012003882A2 (en) |
CA (3) | CA3060376C (en) |
NZ (1) | NZ598018A (en) |
WO (1) | WO2011022124A1 (en) |
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2010
- 2010-07-01 US US12/828,847 patent/US8399767B2/en active Active
- 2010-07-01 CA CA3060376A patent/CA3060376C/en active Active
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WO2013052200A1 (en) * | 2011-10-07 | 2013-04-11 | Titeflex Corporation | Bushings, sealing devices, tubing, and methods of installing tubing |
US8766110B2 (en) | 2011-10-07 | 2014-07-01 | Titeflex Corporation | Bushings, sealing devices, tubing, and methods of installing tubing |
US9541225B2 (en) | 2013-05-09 | 2017-01-10 | Titeflex Corporation | Bushings, sealing devices, tubing, and methods of installing tubing |
CN110291319A (en) * | 2017-02-06 | 2019-09-27 | 日立金属株式会社 | Pipe |
Also Published As
Publication number | Publication date |
---|---|
CA2976959C (en) | 2019-12-17 |
NZ598018A (en) | 2014-04-30 |
US8399767B2 (en) | 2013-03-19 |
US20110042139A1 (en) | 2011-02-24 |
AU2010284564A2 (en) | 2012-04-26 |
US9249904B2 (en) | 2016-02-02 |
US10293440B2 (en) | 2019-05-21 |
CA3060376C (en) | 2021-11-16 |
AU2010284564A1 (en) | 2012-04-19 |
CA2771377A1 (en) | 2011-02-24 |
US20160105944A1 (en) | 2016-04-14 |
US20180065216A1 (en) | 2018-03-08 |
CA2771377C (en) | 2018-05-22 |
EP2467916A1 (en) | 2012-06-27 |
US20160339547A1 (en) | 2016-11-24 |
BR112012003882A2 (en) | 2016-03-29 |
US20110041944A1 (en) | 2011-02-24 |
CA3060376A1 (en) | 2011-02-24 |
CA2976959A1 (en) | 2011-02-24 |
US9445486B2 (en) | 2016-09-13 |
EP2467916A4 (en) | 2014-06-04 |
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