WO2006096297A2 - Systeme de soudage par electro-fusion pour tuyauteries en matiere thermoplastique - Google Patents

Systeme de soudage par electro-fusion pour tuyauteries en matiere thermoplastique Download PDF

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Publication number
WO2006096297A2
WO2006096297A2 PCT/US2006/005351 US2006005351W WO2006096297A2 WO 2006096297 A2 WO2006096297 A2 WO 2006096297A2 US 2006005351 W US2006005351 W US 2006005351W WO 2006096297 A2 WO2006096297 A2 WO 2006096297A2
Authority
WO
WIPO (PCT)
Prior art keywords
coupling
electro
fusion
pipe
proximal
Prior art date
Application number
PCT/US2006/005351
Other languages
English (en)
Other versions
WO2006096297A3 (fr
Inventor
Christopher G. Ziu
Bradley K. Weisbond
Original Assignee
Orion Enterprises, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US11/073,436 external-priority patent/US20060202471A1/en
Application filed by Orion Enterprises, Inc. filed Critical Orion Enterprises, Inc.
Publication of WO2006096297A2 publication Critical patent/WO2006096297A2/fr
Publication of WO2006096297A3 publication Critical patent/WO2006096297A3/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding comprising several wires, e.g. in the form of several independent windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5223—Joining tubular articles for forming corner connections or elbows, e.g. for making V-shaped pieces
    • B29C66/52231—Joining tubular articles for forming corner connections or elbows, e.g. for making V-shaped pieces with a right angle, e.g. for making L-shaped pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • B29C66/976—Checking completion of joining or correct joining by using indications on at least one of the joined parts by the use of an indicator pin, e.g. being integral with one of the parts to be joined
    • 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
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02—Welded joints; Adhesive joints
    • F16L47/03—Welded joints with an electrical resistance incorporated in the joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B29C65/348—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic with a polymer coating

Definitions

  • This invention relates to electro-fusion couplings and fittings for thermoplastic piping.
  • Thermoplastic piping has been used to convey corrosive waste discharge from research laboratories since the late 1960s.
  • borosilicate glass piping was the standard material of choice for the aboveground portions of the piping systems located within buildings.
  • high- silicon alloy iron was the material of choice.
  • thermoplastics such as polyvinyl chloride (PVC) and acrylonitrile-butadiene-styrene copolymer (ABS), as well as polyethylene.
  • PVC and ABS both proved to lack the necessary chemical resistance to common laboratory solvents and environmental stress crack resistance to common disinfectant ingredients such as non-ionic surfactants.
  • PVC, ABS and polyethylene alike all proved to lack the necessary stiffness at elevated temperatures.
  • back-pitch refers to a situation where the pipes that are supposed to be "pitched" at a constant slope downward, instead bow upwards in places thereby preventing gravity from causing 51
  • PVDF fluoropolymer thermoplastic material known for its fire resistance as well as its excellent chemical resistance
  • PVDF fluoropolymer thermoplastic material known for its fire resistance as well as its excellent chemical resistance
  • the present disclosure pertains to electro-fusion couplings and fittings for use with a thermoplastic piping system adapted for use in corrosive waste piping systems.
  • the piping system incorporates use of plain end fittings with use of electro-fusion couplings and fittings.
  • Plain end pipe and plain end fittings are capable of use with other prior art joining systems such as heat element butt fusion, heat element socket fusion, mechanical joint, solvent cementing or adhesive bonding. Therefore, the electro-fusion system of the present invention can be used individually on a given installation, or several of the listed methods can be combined on a given project, e.g., with different methods used in different portions of the system. Regardless of the method or methods used on a given installation, common fittings can be used interchangeably since the end configuration is always the same.
  • the piping system makes use of full integrity "pressure rated” electro-fusion technology using molded-in wire or post-molding imbedded wire and "clampless” designs for the coupling.
  • the resulting installation in a gravity drainage system is pressure-testable and pressure rated to at least the rating of the component having the lowest pressure rating installed in the system. This is highly desirable for applications involving critical fluids that are to be drained down the systems by gravity, due to the unprecedented level of afforded safety factor.
  • the electro-fusion system of the present disclosure results in a relatively much higher level of fusion integrity, and one that is more repeatable for polypropylene, PVDF and other thermoplastic piping systems.
  • advantages of the present system include full pressure integrity without exterior clamping of the joint during fusion.
  • the coupling wall thickness of the present invention is predetermined to be sufficient to restrain the coupling from expanding during the heat fusion stage of coupling.
  • the thickness of the coupling is equal to or greater than the wall thickness of the associated pipe, thereby providing a pressure rating equal to or greater than the pipe.
  • Further advantages include use in a system of plain end fittings, thereby eliminating the need for short pipe nipples.
  • Other advantages of the electro-fusion coupling of the present disclosure include the reduced space required for assembly of an electro-fusion coupling compared to a mechanical coupling. For example, a mechanical coupling requires additional space for manipulating a wrench to tighten the mechanical fasteners (bolt and nut) of the mechanical clamp rather than slipping the electro-fusion coupling on and connecting the power supply wires to the coupling terminals.
  • an electro-fusion drainage system coupling has a tubular body defining an outer surface and an inner surface, the outer surface and the inner surface being substantially parallel, the inner surface defining a passageway from a first end to a second end.
  • a first resistive heating element is disposed in the passageway.
  • the resistive heating element may be disposed in the passageway, e.g., in a spiral groove cut in the interior surface of the body of the coupling with a resistive heating element wire laid down in the groove, or the groove may be a continuous spiral from a first end portion of the coupling to a second end portion.
  • a first spiral groove may be inscribed in the surface of the first end portion to the central portion of the coupling and a second spiral may be inscribed from the central portion to the second end portion of the body, with a first resistive wire disposed in the first spiral groove and a second wire disposed in the second groove.
  • the wires may be electrically connected.
  • a tubular preformed sleeve has a resistive heating element comprising a spiral wound wire disposed on an outer surface of the sleeve.
  • a tubular body is over-molded over the sleeve and heating element.
  • the electro-fusion coupling may include a first radial opening from the inner surface to the outer surface of the body and a second radial opening from the inner surface to the outer surface of the first portion of the body.
  • a first conductive terminal is disposed in the first radial opening and electrically connected to the resistive heating element and a second conductive terminal is disposed in the second radial opening and electrically connected to the resistive heating element.
  • the resistive heating element of the electro-fusion coupling may be coated with fluoropolymer or other polymer coating such as polyamide-imide before being disposed in the groove of the coupling body or coated with fluoropolymer after being disposed in the groove of the coupling body.
  • At least one ridge is integrally molded on the exterior surface at the central portion of the body.
  • the ridge has a first edge generally perpendicular to the outer surface of the coupling positioned at a predetermined distance from the end of the body.
  • the predetermined distance is representative of a desired insertion distance of a first proximal end portion of first thermoplastic pipe inserted into the passageway of the coupling body.
  • the electro-fusion coupling further includes a stop in the passageway of the body, the stop being positioned for contact with a first proximal end portion of first thermoplastic pipe inserted into the passageway of the coupling body.
  • the stop may comprise a continuous circumferential ring of the same material as the body of the coupling and the ring is sized to be partially received in a radial groove milled in the inner surface of the body. The groove is milled in the inner surface before the resistive heating element is put in place.
  • the electro-fusion coupling may include a pop-up fusion indicator having an annular depression on an outer surface of a portion of the fitting body.
  • the annular depression extends into but not through the sidewall.
  • An integral button of sidewall material is disposed to the center of the annular depression.
  • the electro-fusion coupling may further comprise a fitting integrally formed on a second end of the coupling.
  • the fitting may be a tee-fitting, elbow-fitting, wye- fitting, or other standard waste discharge system fitting.
  • the electro-fusion coupling has at least one U- shaped member integrally molded on the outer surface of the central portion.
  • the U- shaped member has a first leg and a second leg adapted to contact a first proximal end portion of a first thermo-plastic pipe to be inserted into the passageway of the coupling body.
  • An outer stop is disposed in the bottom of the U-shaped member.
  • the stop has a first edge generally perpendicular to the bottom of the U-shaped member and positioned at a predetermined distance from the end of the body. The predetermined distance represents a desired insertion distance of a first proximal end portion of first thermoplastic pipe into the passageway of the coupling body.
  • the thermoplastic piping system may be in the form of a kit having at least one mechanical coupling with a predetermined interior diameter and predetermined length configured to accept and couple a thermoplastic pipe of a specified outside diameter.
  • the kit further includes at least one electro- fusion coupling having a predetermined interior diameter configured to accept and couple a thermoplastic pipe of the specified outside diameter of the pipe to be coupled by the mechanical coupling.
  • the electro-fusion coupling has a longitudinal length substantially equivalent to the length of the mechanical coupling.
  • the electro-fusion coupling has an internal working pressure equal to or greater than internal working pressure of the mechanical coupling.
  • Polymeric waste discharge system pipe may be joined using the electro-fusion coupling of the present disclosure by the steps of: providing a first piece and a second piece of polymeric tubular pipe to be joined, each with a proximal terminal end and a proximal end portion adjacent to the proximal terminal end; and providing an electro- fusion coupling (or fitting with electro-fusion ends); inserting the proximal terminal end of the first piece of pipe to be joined in a first end portion of the electro-fusion coupling for a predetermined distance of insertion; inserting the proximal terminal end of the second piece of pipe to be joined in a second end portion of the electro- fusion coupling for a predetermined distance; and applying an electrical current to the resistive element to heat the resistive heating element to a temperature sufficient to fuse each end of the tubular pipe to the coupling absent any external support applied to the outside of the tubular body of the electro-fusion coupling.
  • the method of joining may further include steps of: positioning a squared-off, terminal proxi
  • the method may also include the step of inserting the terminal proximal end of the pipe to be joined into the electro-fusion coupling until the terminal end contacts a stop disposed on the interior surface of the central portion of the coupling.
  • FIG. 1 is a perspective view of an electro-fusion coupling with a resistive heating element in an internal passageway;
  • FIG. 2 is an end view of the electro-fusion coupling of FIG. 1;
  • FIG. 3 A is a cross-sectional side view of the electro-fusion coupling taken along section 3A-3Aof FIG. 2;
  • FIG. 3B is a cross-sectional side view of an electro-fusion coupling taken along section 3B-3B of FIG. 2 with a resistive heating element configured differently than that of the implementation of FIG. 3 A;
  • FIG. 3C is an enlarged partial cross-section of a portion of FIGS. 3 A and 3B illustrating a pop-up fusion indicator and an electrical terminal connector;
  • FIG. 3D is an enlarged partial cross-section taken along section 3D-3D of FIGS. 3A and 3B illustrating a pop-up fusion indicator and an electrical terminal connector;
  • FIG. 4 is a partial cross-sectional side view of a polymeric pipe to polymeric pipe connection, using the electro-fusion coupling of FIG. 1:
  • FIG. 5 is a partial cross-sectional side view of a polymeric pipe to polymeric pipe connection, using a prior art mechanical coupling
  • FIG. 6 is a cross-sectional side view of a polymeric pipe to polymeric elbow connection joint, using the electro-fusion coupling of FIG. 1 and a prior art plain end elbow;
  • FIG. 7 is a partial cross-sectional side view of a polymeric pipe to polymeric elbow connection joint, using a prior art mechanical coupling and a prior art plain end elbow;
  • FIG. 8 is a cross-sectional view of elbow fitting with an integrally- formed electro-fusion coupling on at least one end of the elbow joined to a polymeric pipe;
  • FIG. 9 is a partial cross-sectional side view of the electro-fusion coupling of FIG. 4 with a portion of a polymeric pipe to be joined shown positioned with a terminal end in contact with an exterior ridge of the coupling;
  • FIG. 1OA is a perspective view of an electro-fusion coupling with a U- shaped projection for holding an end of a pipe to be coupled while marking a predetermined depth of insertion on an end portion of the pipe to be coupled;
  • FIG. 1 OB is a perspective view of another implementation of an electro-fusion coupling with a U-shaped projection for holding an end of a pipe to be coupled while marking a predetermined depth of insertion on an end portion of the pipe to be coupled;
  • FIG.1OC is a perspective view of another implementation of an electro- fusion coupling with a U-shaped projection for holding an end of a pipe to be coupled while marking a predetermined depth of insertion on an end portion of the pipe to be coupled;
  • FIG. HA is an end view of the electro-fusion coupling of FIG. 1OA
  • FIG. 1 IB is an end view of the electro-fusion coupling of FIG. 1OB
  • FIG. HC is an end view of the electro-fusion coupling of FIG. 1OC;
  • FIG. 12 is a partial cross-sectional side view of the electro-fusion coupling of FIGS. 1OA, 1OB or 1OC with a portion of polymeric pipe to be joined shown positioned with a terminal end of the pipe in contact with a stop in the bottom of the U-shaped projection of the coupling;
  • FIG. 13 is an end view of another implementation of the electro-fusion coupling having U-shaped projections for measurement spaced circumferentially around the outer surface of the coupling;
  • FIG. 14 is a cross-sectional view of an electro-fusion coupling having a wall thickness that decreases with distance from the center of the coupling to the ends of the coupling;
  • FIG. 15 is an end view of the electro-fusion coupling of FIG. 14;
  • FIG. 16 is a cross-sectional view of an electro-fusion coupling having a wall thickness that decreases with distance from the center of the coupling to the ends of the coupling and includes U-shaped projections for measurement;
  • FIG. 17 is an end view of the electro-fusion coupling of FIG. 16;
  • FIG. 18 is a perspective view of an electro-fusion coupling with a stiffening ring of higher tensile strength material disposed on the electro-fusion coupling of FIG. 1;
  • FIG. 19 is an end view of the electro-fusion coupling of FIG. 18;
  • FIG. 20 is a cross-sectional view of a transition coupling having a bell connection for use with a fusion sealing system and a spigot end for use in a prior art mechanical or socket system;
  • FIG. 21 is an end view of an alternative implementation of an electrofusion coupling wherein the legs of the U-shaped projection are disposed tangent instead of radially.
  • an electro-fusion coupling 100 for making electro-fusion (re: ASTM F 1073 and ASTM F 1290) connections between carrier pipe and/or other fittings (hereinafter referred to generally as "couplings") of various configurations is designed to receive pipes 210 and 212 in opposing socket ends 110 and 112.
  • the circuit 300 can consist of one circuit that runs from a near first end 110 of the coupling 100 to a second end 112.
  • the coupling 100 can contain two separate wire circuits, one for each of the opposing socket ends 110, 112, (FIG. 3B).
  • stop 150 is a full circumferential stop formed of the same material as the coupling body. This is desirable in drainage systems so a smooth interior surface is in the flow area of a gravity draining system.
  • the stop 150 can be configured so that in cross-section, it is essentially "square" to match pipe and fitting ends that are squarely cut.
  • the stop can be implemented with a smooth bevel (i.e. radius), e.g., having a radius of 3 mm or 1/8-inch, with all ends of pipes and fittings advantageously prepared with the same external bevel to match the contour of the bevel so that when the pipe or fitting ends are properly inserted, the ends are essentially flush with the stop resulting in a substantially smooth surface to be encountered by the fluid flow of the draining system.
  • the interior pipe stop can be manufactured using a separate continuous polypropylene ring, which is later assembled into a counterbore 152 on the inside surface 170 of the coupling.
  • This method allows for a full circumferential stop to be used on the inside diameter of the coupling, which is otherwise difficult to achieve with a coupling where the wire is inlaid by this method.
  • a full circumferential stop, or nearly full circumferential stop, is desirable in gravity-flow drainage applications to prevent fluid flow from slowing down, and creating the possibility of fluid back-up. Referring now to FIG. 9, in implementations where there is an interior stop
  • the contractor can then mark (M) the exterior of a pipe to 212 for the proper depth of insertion, L 2j of pipe to make certain the pipes are fully inserted into the coupling so as to produce a smooth bore across the pipe-to-pipe interface when the joint is made.
  • the length from the terminal edge of the coupling 100 to the perpendicular edge 162 of the ridge 160 is Lj.
  • the distance Li is equal to L 2 .
  • This external ridge can also function as a stiffening ring, thereby reducing the thickness to which the coupling must be molded to achieve a full rating for the coupling joint as closely equal as possible to the thickest associated pipe to be joined, thereby reducing material costs.
  • a spiral groove 600 is inscribed on the inner surface 170 of a preformed coupling. It will be understood that the spiral groove may be of a continuous consistent pitch from beginning to end or the pitch of the spiral may change one or more times from the beginning of a groove to the end of the groove.
  • a resistive heating element comprising a wire 176 is disposed in the spiral groove.
  • First and second radial openings 182 and 184 extend from the inner surface 170 to the outer surface 180 of the coupling body.
  • a first conductive terminal 500 is disposed in the first opening and electrically connected to a first end region of the resistive heating element 176 and a second conductive terminal 500 is electrically connected to a second end region of the resistive heating element 176.
  • the terminal connectors 500 can be of any diameter, but it is preferentially one of several standard diameters, including 4.0 mm, 4.7 mm, or other standard pin sizes.
  • the molded coupling body Surrounding the terminal connection, the molded coupling body includes a cylindrical terminal protector comprising a protective sleeve 510 formed around the terminal connector 500, so that when the connector is affixed to the heating element leads, it is shielded by the terminal protector, thereby minimizing exposure of an installer to a terminal and reducing chances for injury due to electrocution.
  • Such terminal protectors may be used with other implementations of the electro-fusion couplings of the present invention.
  • Pop-up fusion indicators have an annular depression 552 into the surface 180, 480 and penetrating into the tubular body sidewall 172, 472. Integral button 554 of sidewall of material is left in the center of the annular depression 552.
  • the annular depression 552 is molded integrally into the sidewall 172, 472 leaving the central indicator button 554 in the center of the annular depression.
  • the annular depression 552 may be drilled in the sidewall 172 or 472.
  • Prior art fusion indicators typically consist of a button and spring inserted into a depression in the sidewall of a coupling.
  • the present design represents a significant cost savings over the prior art because the button is formed integral to the body. Additionally, since the button is integral to the body it will not detach from the coupling and become lost prior to the fusion. The indicators are forced to rise by molten fusion material in the wall of the coupling, thereby indicating that fusion has taken place. Pop-up-fusion indicators may be used with other implementations of the electro-fusion coupling of the present invention.
  • the electro-fusion drainage system coupling 400 is similar to the first implementation.
  • the coupling includes a tubular body having: a first end portion proximal to a first end 410; a second end portion proximal to a second end 412; a central portion 414 between the two end portions; and an outer surface 480 and an inner surface 470.
  • the outer surface 480 and the inner surface 470 are substantially parallel, with the inner surface defining a passageway from the first end 410 to the second end 412.
  • a first spiral groove 610 is inscribed in the inner surface 470 extending from the central portion 414 of the body.
  • the inscribing tool changes the pitch of inscribing in the central portion 414 leaving a space for the stop ring 150 in the central portion and a second spiral groove 612 is inscribed in the inner surface 470 extending from the central portion 414 of the body the second portion 412 of the body.
  • a first resistive heating element comprising a wire 310 is disposed in the first spiral groove 610 and a second resistive heating element 312 comprising a wire is disposed in the second spiral groove 612.
  • the first and second heating elements may be electrically connected. Alternatively, a single wire may be laid down from the first portion 410 across the center portion 414 to the second portion 412.
  • First and second radial openings 182 and 184 extend from the inner surface 470 to the outer surface 480 of the coupling body.
  • a first conductive terminal 500 is disposed in the first opening and electrically connected to the resistive heating element and a second conductive terminal 500 is electrically connected to the resistive heating element.
  • the coupling 400 may also include a stop 150 and fusion indicators 550 as illustrated and discussed in the first implementation disclosed in FIG. 3A.
  • the electro-fusion coupling may be manufactured using a prior art socket fusion coupling wherein at least one end of the coupling has the interior milled to predetermined dimension and then a spiral groove is milled on the interior surface as has been described with regard to FIGS. 3 A and 3B.
  • a resistive heating element is disposed in the groove and connected to terminals as heretofore described. It will be understood that both ends of the socket fusion fittings may be milled and have a resistive heating element installed or only one end may have the heating element installed whereby the remaining end may still function as a socket coupling.
  • the electro-fusion coupling 100 of the present disclosure joins two pieces of pipe 210 and 212 with outside diameter D 1 .
  • the inside diameter of the coupling is substantially equal to the outside diameter Di of the pipe to be joined.
  • the outside diameter of the coupling is denoted as D 2 .
  • the overall axial length of the coupling 100 is illustrated as L T .
  • a prior art mechanical coupling 1000 (manufactured by the assignee of this application) joins a pipe of outside diameter Dj having the same overall longitudinal length LT.
  • the prior art mechanical coupling 1000 includes a polymeric sleeve 1010 placed in contact with the end regions of pipes 210 and 212 to be joined and an exterior metal sleeve 1020 with opposed ears 1030 and conventional fasteners 1040.
  • the common longitudinal length L T permits interchangeability of the mechanical and electro-fusion couplings on the same construction site. Applicant believes the longitudinal length L T is shorter than any commercially available electro-fusion coupling of the same pressure rating. Approximate internal diameter, external diameter and total length of one embodiment of the electro-fusion coupling is in the Table 1 below.
  • FIGS. 6 and 7 therein is illustrated a polymeric elbow 220 joining to a polymeric pipe 210 with a polymeric coupling 100 (FIG. 6) and with a standard prior art mechanical coupling 1000 (FIG. 7).
  • the prior art clamp has total longitudinal length L T equal to the longitudinal length L T of the electro-fusion coupling, which permits interchangeability of the mechanical and electro-fusion couplings on the same construction site.
  • the wall thickness W 2 of the coupling 100 is predetermined to be of thickness sufficient to restrain the coupling from expanding during the heat fusion stage of the coupling process.
  • the thickness of the pipe coupling W 2 is equal to or greater than the wall thickness Wi of the pipe to be joined.
  • the electro-fusion couplings 100, 400, 700, 800 and 900 are designed with an internal working pressure rating equal to or greater than that of an equivalent mechanical coupling 1000.
  • an elbow fitting 700 has an integral coupling 790 formed on one end.
  • the external diameter of the electro-fusion coupling end of the elbow fitting is D2, which is the same outside diameter (D2) of the electro-fusion fitting 100, 400 and 800.
  • the integral coupling may be manufactured as an integral electro-fusion coupling or an integral prior art socket coupling may have the socket milled to predetermined dimensions and the electro-fusion wires laid down in grooves milled into the socket fusion coupling as described with regard to FIGS. 3 A and 3B.
  • a squared off terminal proximal end 290 of the pipe 212 is positioned adjacent to and in contact with an external ridge 162 molded on the exterior parallel surface 180 of the central portion of the electro-fusion coupling 100.
  • the tubular pipe 212 is further positioned such that a longitudinal axis XX of the pipe 212 and a longitudinal axis X'X' of the coupling 100 are parallel to each other and an outside surface 280 of tubular pipe 212 is adjacent to and generally in contact with the outside parallel surface 180 of the electro-fusion coupling.
  • the pipe installer or helper marks the outside surface 280 of the pipe 212 where the end of the coupling is contacting the pipe with a mark designated herein by reference numeral M.
  • the distance Li from the mark (M) on the outside of the pipe 212 to the first proximal terminal end 290 of the pipe is equal to the predetermined distance L 2 of insertion of the first proximal terminal end 290 of the pipe into the end portion of the electro-fusion coupling 100.
  • the wire resistive heating elements 600, 610, 612 with a tough, high temperature corrosion resistant coating, e.g., fluoropolymers such as PFA (one of the grades of Teflon ® ) or polyamide-imide (PAI), on the wire.
  • a tough, high temperature corrosion resistant coating e.g., fluoropolymers such as PFA (one of the grades of Teflon ® ) or polyamide-imide (PAI)
  • PFA one of the grades of Teflon ®
  • PAI polyamide-imide
  • copper ions freed during reaction with acids and caustic solutions, can function as a stress- cracking reagent, which, if stress is present in the system, can lead to complete fracturing of the joints.
  • it is desirable to protect the wire e.g., by means of a coating, as a conservative measure. It is further beneficial to protect the wire with a coating that also serves a dielectric function so that if wires migrate during the fusion, the dielectric characteristic helps to prevent the wires from burning out or shorting out.
  • electro-fusion coupling 900 includes a U-shaped projection 936 having two upwardly disposed sides 930, 932 connected to or formed integrally with the outer surface 980 of the coupling 900.
  • the concave inner surface (bottom) 934 of the U-shaped projection is configured to correspond to the outside diameter D] of the pipe to be joined (see FIG.
  • IPS pipe e.g. 2- inch IPS pipe has an outside diameter of 2.375 inches; therefore the radius Ri of the inner curve of the U-shaped projection should be 1.1875 inches so that when the coupling is held against the corresponding pipe to mark it, it fits snugly and uniformly against the outer pipe wall.
  • the tubular pipe 212 is positioned such that the longitudinal axis of the pipe XX and the longitudinal axis X"X" of the coupling 900 are parallel to each other and the outside surface 280 of the tubular pipe 212 is adjacent to and generally contacting the inside surface 934, 935. If the U-shaped profile extends all the way to the ends of the coupling, together with the coupling insertion marking stop 950, the contractor can make a smooth semicircular mark "M" around a portion of the exterior of the pipe to be joined (e.g. for approx. 90 degrees) in exactly the right spot to indicate the desired insertion length L 2 of the pipe 212 as was previously discussed in regards to FIG. 9.
  • the contractor can make a complete circle around the pipe to provide a full and complete mark for proper insertion of the pipe.
  • the couplings serve as a marking tool to insure proper installation, as well as a coupling.
  • the U-shaped projections can function as integral stiffening ribs, which together with the external central stop 950 provide significant stiffening, thereby further lessening the overall mass (and material) required to mold an acceptable coupling. Referring to FIGS.
  • the outside radius R ⁇ of the sides 930 and 932 of the U-shaped projections should be limited to a dimension that allows the coupling to fit within the likely inside diameter of the common corresponding outer pipes within which it is likely to be contained in a dual containment system.
  • This normally means within a pipe of reasonable wall thickness two nominal pipe sizes larger than the corresponding pipe to which the coupling is joined.
  • a 2- inch IPS pipe and coupling is normally housed within a 4-inch IPS pipe
  • a 3-inch IPS and coupling is housed under a 6-inch IPS pipe
  • a 4-inch within an 8-inch a 1-inch within a 3-inch
  • FIGS. 1OB and HB therein is another implementation of the electro-fusion coupling of FIGS. 1OA and 1 IA.
  • the bottom wall 935 of the U-shaped projection is configured differently to save on material used in constructing the coupling.
  • Sidewalls 930 and 932 are positioned to receive the outside surface of the pipe to be coupled as in FIGS. 1OA and 1 IA.
  • the bottom wall 935 follows the surface of coupling 900 and creates voids 937 between the U-shaped member and the outer surface of the pipe to be joined instead of bottom 934 following the radius Ri as in the implementation of FIG. 1OA.
  • the void area is an area not filled by material of the coupling thereby saving on the amount of material used in the coupling.
  • FIGS. 1OC and HC therein is another implementation of the electro-fusion coupling of FIGS. 1OA and 1 IA.
  • the U-shaped projection is configured differently to save on material used in constructing the coupling.
  • Sidewalls 930 and 932 are positioned to receive the outside surface of the pipe to be coupled as in FIGS. 1OA and HA.
  • the bottom 934 of the U-shaped member follows the radius Ri as in the implementation of FIG. 1OA.
  • voids 945 and 947 are molded between the surface of the coupling and the bottom of the U-shaped projection, thereby saving on material. Referring to FIG.
  • FIG. 13 is another implementation of an electrofusion coupling wherein multiple center stops 950 and multiple U-shaped projections 936 are disposed around the outside circumference of the coupling.
  • the center stop 950 functions as a stiffening cross brace and the U-shaped projections 936 serve as stiffening vanes, thereby allowing the coupling wall thickness to be reduced and in a savings of material used in manufacturing.
  • the legs or sides 930 or 932 which form the U- shaped structures on the exterior of the coupling can be positioned to project radially out from the coupling at a tangent to the circle formed by the cross section of the coupling (see Fig. 21).
  • the legs/sides of the U-shaped member in this manner, and positioning them in pairs (e.g. at roughly 8:30 and 9:30; 2:30 and 3:30, etc., as opposed to projecting outward from a line extending from the centerpoint of the circle, the manufacturability of the part will be enhanced. This is due to the fact that the mold cavity can be kept simpler, with less moving parts.
  • the mold cavity can be made to split at the 12:00 position and 6:00 position in two simple halves. This would keep the mold design as a simple arrangement of two split cavities with removable cores, as opposed to a mold with a lot of parts that are required to move by means of hydraulics and/or operated with robotics.
  • the wall thickness of the coupling 1100 decreases with distance from the center portion of the coupling proceeding from a wall thickness OfW 3 at the center to a wall thickness of W 4 at the end of the coupling, thereby also saving on material used in forming the coupling and providing a thicker wall thickness where the stress is greater during the electro-fusion operation.
  • a central portion of the coupling may have an outer surface parallel to the inner surface of the coupling as illustrated in FIG. 1.
  • the tapered wall may begin at the terminus of such central portion and taper to a position proximate to the end of the coupling.
  • an electro-fusion coupling 1200 having a tapered wall as illustrated and discussed with regards to FIGS. 14 and 15 and with U-shaped projections 936 and center stops 950 as illustrated and discussed with regard to FIGS. 1OA, 1OB, 1OC, HA, HB, HC, and 13.
  • the center stop 950 functions as a stiffening cross brace and the U-shaped projections 936 serve as stiffening vanes, thereby allowing the coupling wall thickness to be reduced and results in a savings of material used in manufacturing.
  • a thin radial vane can be formed at the outer edge of the coupling.
  • the purpose of this vane is to give the pipe member a place to rest against, when using the U-shaped member and external center stop to mark the coupling. Since the exterior of the tapered coupling is not an even surface, if the exterior radial vane is made to the proper height in its center where its center height equals the largest diameter at the point where the exterior center stop is formed, then this allows the pipe to be held in a straight position.
  • this radial vane is formed as a curve at its outer edge which matches the outside diameter of the pipe to which it is being positioned against it. This allows for the pipe to be held snugly in position for marking, and also allows for a place along which to trace the marking instrument.
  • the exterior of the coupling at the point where the center stop is formed could also have a slight U-shaped curve incorporated to allow the pipe to sit snugly along the inside as well as along the outer radial marking vane to allow for the pipe to be snugly held in place for marking.
  • FIGS. 18 and 19 wherein there is illustrated a coupling 100 as illustrated and described in FIGS. 1, 2, 3A, 3B, 3C and 3D with one or more stiffening rings 1300 disposed proximal to the end of the coupling.
  • the ring 1300 may be a continuous circumferential ring or may be a discontinuous split ring.
  • the ring may be used on one or both ends of the coupling to provide support and reduce the material used in the coupling.
  • the transition coupling has a tubular body with a first bell (female) end portion 1410 and a spigot end (male) portion 1430 and a central transition portion 1420 between the two end portions.
  • a passageway from the first end to the second end of the coupling is defined by an inner surface 1412 of the first bell end portion and an inner surface 1422 of the central transition portion and an inner surface 1432 of the second spigot end portion.
  • a spiral groove 600 is inscribed in the inner surface of the first bell end and a resistive heating element 176 comprising a wire is disposed in the spiral groove.
  • the heating element 176 is connected to conductive terminals 500 disposed in the first portion of the coupling.
  • the second spigot portion 1430 male end
  • the spigot portion can be inserted into the bell (female) end of any prior art mechanical or socket fusion socket connector such as standard coupling, wye, tee or elbow to transition from an electro-fusion system to a mechanical or glued system.
  • any prior art mechanical or socket fusion socket connector such as standard coupling, wye, tee or elbow to transition from an electro-fusion system to a mechanical or glued system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

L'invention concerne un couplage à système de drainage par électro-fusion (100, 400, 700, 800, 1100, 1200, 1300, 1400) présentant un corps tubulaire à surfaces extérieures (180, 480, 980) et intérieures (170, 470, 970) sensiblement parallèles entre elles. La surface intérieure définit un passage à partir d'une extrémité (110, 410, 910) à l'autre (112, 412, 912). Un élément de chauffage à résistance (300, 310, 312, 610, 612) est disposé dans ledit passage. Dans une forme d'exécution, une nervure (162) est moulée d'une seule pièce avec la surface extérieure (180) de la portion centrale du corps, à une distance prédéterminée L1 de l'extrémité. La distance prédéterminée L1 représente une distance d'insertion désirée L2 du tuyau (212) dans le passage du corps de couplage. Le couplage par électro-fusion peut en outre comprendre une butée (150) positionnée dans le passage pour venir en contact avec l'extrémité du tuyau thermoplastique inséré dans ledit passage, D'autres formes d'exécution (900) peuvent comprendre un élément en forme de U (936), moulé d'une seule pièce avec la surface extérieure (980) de la portion centrale du corps, et comportant une butée extérieure (950) dans le fond (934) de la saillie en forme de U (936).
PCT/US2006/005351 2005-03-07 2006-02-16 Systeme de soudage par electro-fusion pour tuyauteries en matiere thermoplastique WO2006096297A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US11/073,436 2005-03-07
US11/073,436 US20060202471A1 (en) 2005-03-07 2005-03-07 Electro-fusion joining system for thermoplastic piping systems
US11/134,879 US20060197338A1 (en) 2005-03-07 2005-05-23 Electro-fusion joining system for thermoplastic piping systems
US11/134,879 2005-05-23

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007042807A1 (de) 2007-09-07 2009-03-12 Egeplast Werner Strumann Gmbh & Co. Kg Heizwendelmuffe
WO2017194812A1 (fr) * 2016-05-13 2017-11-16 Abn Pipe Systems, S.L.U. Dispositif de raccordement pour éléments de tuyauterie

Citations (1)

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Publication number Priority date Publication date Assignee Title
US4842305A (en) * 1984-08-14 1989-06-27 Osterreichische Salen-Kunststoffwerk Gmbh Pipe joint connecting plastic pipes and process of making such joint

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US4842305A (en) * 1984-08-14 1989-06-27 Osterreichische Salen-Kunststoffwerk Gmbh Pipe joint connecting plastic pipes and process of making such joint

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007042807A1 (de) 2007-09-07 2009-03-12 Egeplast Werner Strumann Gmbh & Co. Kg Heizwendelmuffe
WO2009033608A1 (fr) 2007-09-07 2009-03-19 Egeplast Werner Strumann Gmbh & Co. Kg Manchon chauffant
WO2017194812A1 (fr) * 2016-05-13 2017-11-16 Abn Pipe Systems, S.L.U. Dispositif de raccordement pour éléments de tuyauterie
US11506320B2 (en) 2016-05-13 2022-11-22 Abn Pipe Systems, S.L.U. Connection device for pipe elements

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