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DE10211703B4 - Verfahren zur Herstellung einer feuchtigkeitsdichten Verbindung - Google Patents

Verfahren zur Herstellung einer feuchtigkeitsdichten Verbindung Download PDF

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Publication number
DE10211703B4
DE10211703B4 DE10211703A DE10211703A DE10211703B4 DE 10211703 B4 DE10211703 B4 DE 10211703B4 DE 10211703 A DE10211703 A DE 10211703A DE 10211703 A DE10211703 A DE 10211703A DE 10211703 B4 DE10211703 B4 DE 10211703B4
Authority
DE
Germany
Prior art keywords
plastic
plastic pipes
pipes
heating
sleeve tube
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
DE10211703A
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English (en)
Other versions
DE10211703A1 (de
Inventor
Jörn Dipl.-Ing. Homann
Wolf Dieter Strumpen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brugg Rohr AG Holding
Original Assignee
Brugg Rohr AG Holding
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
Application filed by Brugg Rohr AG Holding filed Critical Brugg Rohr AG Holding
Priority to DE10211703A priority Critical patent/DE10211703B4/de
Priority to IT000091A priority patent/ITRM20030091A1/it
Priority to PL359126A priority patent/PL203692B1/pl
Priority to DK200300374A priority patent/DK200300374A/da
Publication of DE10211703A1 publication Critical patent/DE10211703A1/de
Application granted granted Critical
Publication of DE10211703B4 publication Critical patent/DE10211703B4/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • F16L47/20—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
    • F16L47/22—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics using shrink-down material
    • 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
    • B29C65/3428—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 said at least a single wire having a waveform, e.g. a sinusoidal form
    • 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
    • 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
    • B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
    • 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
    • B29C66/50—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
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5324—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length
    • B29C66/53241—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length said articles being tubular and said substantially annular single elements being of finite length relative to the infinite length of said tubular articles
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/723—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 structure of the material of the parts to be joined being multi-layered
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/727—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 structure of the material of the parts to be joined being porous, e.g. foam
    • 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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7371—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73715—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable heat-shrinkable
    • 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91221—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91653—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the voltage, i.e. the electric potential difference or electric tension
    • 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
    • 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
    • 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
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
    • F16L59/18—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for joints
    • F16L59/20—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for joints for non-disconnectable joints
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/46—Heating elements having the shape of rods or tubes non-flexible heating conductor mounted on insulating base
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • B29C66/70—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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/723—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 structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • 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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid
    • B29L2023/225—Insulated
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/003—Heaters using a particular layout for the resistive material or resistive elements using serpentine layout

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Verfahren zur Herstellung einer feuchtigkeitsdichten Verbindung zwischen den Enden zweier Kunststoffrohre, bei dem ein aufgeweitetes Muffenrohr aus Kunststoff auf die Enden der Kunststoffrohre geschoben, geschrumpft und mittels Heizelementen mit den Kunststoffrohren verschweißt wird, gekennzeichnet durch folgende Merkmale:
a) Aufschieben eines Muffenrohres auf das Ende eines der Kunststoffrohre.
b) Aufwickeln eines Heizelements aus je einem in einen Streifen aus Kunststoffolie eingebetteten mäanderförmig geformten Metalldraht auf die Kunststoffrohre mit zumindest einer Windung.
c) Einbringen je eines Thermofühlers in den Bereich des Heizelementes.
d) Verschieben des Muffenrohres über die Verbindungsstelle und Schrumpfen des Muffenrohres zumindest an seinen Enden auf die Heizelemente und
e) Aufheizen der Metalldrähte durch elektrischen Strom und Verschweißen der Enden des Muffenrohres mit den Enden der Kunststoffrohre.

Description

  • Die Erfindung betrifft ein Verfahren zur Herstellung einer feuchtigkeitsdichten Verbindung zwischen zwei Kunststoffrohren nach dem Oberbegriff des Anspruchs 1.
  • Aus der EP 1 087 171 A1 ist ein Verfahren zur Herstellung einer Rohrmuffe aus Kunststoff bekannt, bei dem an der inneren Oberfläche der Rohrmuffe ein elektrisches Widerstandsheizelement aus einem mäanderförmig gebogenen Draht befestigt wird, die Rohrmuffe mit dem Widerstandsheizelement aufgeweitet wird und anschließend die Rohrmuffe im aufgeweiteten Zustand abgekühlt wird. Das Widerstandselement besteht aus einem Metalldraht, der in einem Kunststoffband eingebettet ist. Die bekannte Rohrmuffe wird bei der Herstellung einer Verbindung von Fernwärmeleitungen eingesetzt. Hierbei wird die aufgeweitete Rohrmuffe über das Ende eines der zu verbindenden Fernwärmeleitungsrohre geschoben. Nach dem Verbinden der Mediumrohre wird die Rohrmuffe über die Verbindungsstelle geschoben, durch Wärmezufuhr geschrumpft und durch Anlegen einer Spannung an die Metalldrähte mit den Mantelrohren der Fernwärmeleitungen verschweißt.
  • Nachteilig ist hierbei, daß beim Aufweiten der Rohrmuffe nicht sichergestellt werden kann, daß sich der Abstand zwischen den Mäanderwindungen gleichmäßig verändert. Bei ungleichem Abstand der Windungen ist die Wärmezufuhr an den Stellen eines größeren Abstandes geringer. Dies kann dazu führen, daß an diesen Stellen nur eine unzureichende Verschweißung der Rohrmuffe mit den Mantelrohren erreicht wird. Ein weiterer Nachteil besteht darin, daß unter den widrigen Baustellenbedingungen der Bereich der Widerstandselemente verschmutzt, was ebenfalls zu fehlerhaften Schweißverbindungen führen kann.
  • Der Erfindung liegt die Aufgabe zugrunde, das bekannte Verfahren dahingehend zu verbessern, daß der Abstand der einzelnen Mäanderwindungen mit Sicherheit konstant gehalten wird und dadurch an jeder Stelle des Umfangs eine gleich große Wärmemenge zugeführt wird und daß vermieden wird, daß Schmutz in den Bereich der Schweißnaht gelangen kann.
  • Diese Aufgabe wird durch die im Kennzeichen des Anspruchs 1 erfaßten Merkmale gelöst.
  • Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen erfaßt.
  • Neben den sich aus der Aufgabenstellung direkt ergebenden Vorteile weist die Erfindung noch folgenden Vorteil auf, daß das Heizelement in Form von großen Längen, z. B. auf Vorratsrollen an der Baustelle anlieferbar ist und die benötigte Länge von der Vorratsrolle abnehmbar ist.
  • Die Erfindung ist anhand der in den 1 bis 4 schematisch dargestellten Ausführungsbeispiele näher erläutert.
  • In der 1 ist eine Ansicht eines Heizelementes 1 dargestellt, welches mit besonderem Vorteil bei dem erfindungsgemäßen Verfahren Verwendung findet.
  • Das Heizelement 1 besteht aus einem mäanderförmig geformten Metalldraht 2 vorzugsweise aus Kupfer, welcher in einem Folienstreifen 3 aus Kunststoff eingebettet ist. Der Folienstreifen 3 besteht aus dem gleichen Kunststoff wie die zu verbindenden Kunststoffrohre 4 und das Muffenrohr 5. Das Heizelement 1 kann in großen Längen in kontinuierlicher Arbeitsweise hergestellt und auf Vorratsspulen aufgewickelt werden.
  • Die Konfektionierung kann werksseitig oder an der Baustelle durchgeführt werden. Hierzu werden die Anschlußenden 6 des Metalldrahtes 2 rechtwinklig vom Heizelement 1 abgehend geformt.
  • Zwischen den beiden Enden des Heizelementes 1 wird ein Trägerfolienabschnitt 7 aus dem gleichen Kunststoff wie der Folienstreifen 3 an dem Folienstreifen 3 durch Schweißen befestigt. Der Trägerfolienabschnitt 7 trägt einen Thermofühler 8 der mit Verankerungselementen 9 an dem Trägerfolienabschnitt 7 befestigt ist. Der Thermofühler 8 ist zwischen zwei Mäanderwindungen des Metalldrahtes 2 angeordnet.
  • In der 2 ist eine Ansicht eines Endes des Kunststoffrohres 4 teilweise dargestellt. Nachdem das Muffenrohr 5 über eines der Kunststoffrohre 4 geschoben wurde, wird zunächst die Oberfläche des Kunststoffrohres 4 gereinigt und dann ein Heizelement 1 mit einer Windung auf das Kunststoffrohr 4 gewickelt. Das Heizelement 1 wird durch Wärmezufuhr von außen oder durch Anlegen einer Spannung an den Metalldraht 2 bis kurz unterhalb des Kristallitschmelzbereiches des Folienstreifens 3 erwärmt und dem Umfang des Kunststoffrohres 4 angepaßt.
  • Anschließend wird der Folienstreifen 3 durch örtliches Erwärmen auf eine Temperatur oberhalb des Kristallitschmelzbereiches an dem Kunststoffrohr 4 fixiert.
  • Mittels eines temperaturfesten, elektrisch nicht leitenden Abstandshalters 10, der ebenfalls auf dem Kunststoffrohr 4 befestigt wird, werden die Anschlußenden 6 des Metalldrahtes 2 in Abstand zueinander gehalten, wobei der Abstand der Anschlußenden 6 zueinander dem Abstand zweier Mäanderwindungen entspricht.
  • In der 3 ist der Zustand dargestellt, wenn auf beiden zu verbindenden Kunststoffrohren 4 die Heizelemente 1 und Thermofühler 8 an mindestens einem Ende wie vorgehend beschrieben fixiert sind.
  • Nun wird das Muffenrohr 5, welches ebenfalls aus dem gleichen Kunststoff wie die Kunststoffrohre 4 besteht, über die Verbindungsstelle geschoben, so daß beide Heizelemente 1 von dem Muffenrohr 5 überdeckt sind und die Anschlußenden 6 sowie die Enden des Thermofühlers 8 an beiden Enden des Muffenrohres 5 herausragen. Es versteht sich von selbst, daß die innere Oberfläche des Muffenrohres 5 zumindest an seinen Enden vorher gereinigt wird. Durch Zufuhr von Wärme von außen werden die Enden des aufgeweiteten Muffenrohres 5 geschrumpft und die Heizelemente 1 zwischen den Kunststoffrohren 4 und dem Muffenrohr 5 gekammert. Da das Muffenrohr 5 im unaufgeweiteten Zustand die gleichen Abmessungen hat wie das Kunststoffrohr 4 liegt das Muffenrohr 5 mit beiden Enden mit Vorspannung auf dem Kunststoffrohr 4 auf.
  • Nun werden die Anschlußenden 6 mit einer Spannungsquelle verbunden und die Thermofühler 8 an eine Meßapparatur angeschlossen. Spannungsquelle und Meßapparatur sind nicht näher dargestellt. Eine derartige Apparatur ist Gegenstand der offengelegten deutschen Patentanmeldung 37 02 912 . Durch Anlegen einer Spannung an die Anschlußenden 6 der Heizelemente 1 werden die Folienstreifen 3 sowie die Grenzbereiche der Kunststoffrohre 4 sowie des Muffenrohres 5 geschmolzen und vermischen sich miteinander. Die Energiezufuhr wird dabei durch die von den Thermofühlern 8 gemessenen Werte geregelt.
  • Nach dem Schweißvorgang kann der zwischen dem Innenrohr 11 und dem Muffenrohr 5 verbleibende Zwischenraum 13 mit einem Schaumstoff ausgefüllt werden, der aus dem gleichen Werkstoff wie die zwischen dem Innenrohr 11 und dem Kunststoffrohr 4 bei Fernwärmeleitungen vorgesehene Isolierschicht 12, die üblicherweise aus Polyurethan besteht.
  • 4 zeigt die Verbindungsstelle vor dem Anschäumen des Zwischenraumes 13.
  • Die nach der Lehre der Erfindung hergestellte Verbindungsstelle ist gegen das Eindringen von Feuchtigkeit gesichert und ist so fest, daß Kräfte, die aufgrund von Temperaturänderungen und dadurch bedingten Schiebungen des Fernwärmeleitungsrohrs entstehen, aufgenommen werden können.

Claims (7)

  1. Verfahren zur Herstellung einer feuchtigkeitsdichten Verbindung zwischen den Enden zweier Kunststoffrohre, bei dem ein aufgeweitetes Muffenrohr aus Kunststoff auf die Enden der Kunststoffrohre geschoben, geschrumpft und mittels Heizelementen mit den Kunststoffrohren verschweißt wird, gekennzeichnet durch folgende Merkmale: a) Aufschieben eines Muffenrohres auf das Ende eines der Kunststoffrohre. b) Aufwickeln eines Heizelements aus je einem in einen Streifen aus Kunststoffolie eingebetteten mäanderförmig geformten Metalldraht auf die Kunststoffrohre mit zumindest einer Windung. c) Einbringen je eines Thermofühlers in den Bereich des Heizelementes. d) Verschieben des Muffenrohres über die Verbindungsstelle und Schrumpfen des Muffenrohres zumindest an seinen Enden auf die Heizelemente und e) Aufheizen der Metalldrähte durch elektrischen Strom und Verschweißen der Enden des Muffenrohres mit den Enden der Kunststoffrohre.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die den mäanderförmig geformten Draht aufnehmende Kunststoffolie nach dem Aufwickeln auf die Kunststoffrohre durch Erwärmen dehnbar gemacht und dem Umfang des jeweiligen Kunststoffrohres angepasst wird.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass nach der Anpassung an den Umfang die Kunststoffolie an der Oberfläche der Kunststoffrohre fixiert wird.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass auf die Enden des Muffenrohres vor oder unmittelbar nach dem Beginn des Schweißens Spannelemente aufgespannt werden.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Anschlußenden der Metalldrähte durch Abstandshalter in Abstand zueinander gehalten werden, wobei der Abstand der Anschlußenden zueinander dem Abstand der Mäanderwindungen entspricht.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass ein Abstandshalter für die Anschlußenden des Heizelementes auf dem Kunststoffrohr befestigt wird.
  7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Kunststoffrohre als Mäntel von Fernwärmeleitungen ausgeführt sind.
DE10211703A 2002-03-16 2002-03-16 Verfahren zur Herstellung einer feuchtigkeitsdichten Verbindung Expired - Fee Related DE10211703B4 (de)

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DE10211703A DE10211703B4 (de) 2002-03-16 2002-03-16 Verfahren zur Herstellung einer feuchtigkeitsdichten Verbindung
IT000091A ITRM20030091A1 (it) 2002-03-16 2003-02-28 Procedimento per la produzione di una connessione a tenuta di umidita'.
PL359126A PL203692B1 (pl) 2002-03-16 2003-03-12 Sposób wytwarzania szczelnego względem wilgoci połączenia między końcami dwóch rur z tworzywa sztucznego
DK200300374A DK200300374A (da) 2002-03-16 2003-03-12 Fremgangsmåde til fremstilling af en fugtighedstæt forbindelse

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CH704994B1 (fr) * 2011-05-20 2016-03-15 Plco Pipelines Construction S A Procédé de raccordement de conduits de chauffage urbain et manchon de raccordement pour la mise en œuvre de ce procédé.
NL1040210C2 (nl) * 2013-05-14 2014-11-24 C C Rombouts Kunststof Techniek Holding B V Werkwijze voor het tegengaan van vochtmigratie in een thermisch geïsoleerde buis, alsmede volgens deze werkwijze vervaardigde buis.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3702912A1 (de) * 1986-06-05 1987-12-10 Kabelmetal Electro Gmbh Verfahren zur regelung des schweissvorganges bei der herstellung einer muffenverbindung fuer waermeisolierte leitungsrohre
DE3720577A1 (de) * 1986-07-31 1988-02-04 Meier Schenk Ag Schweissmanschette zur herstellung einer rohrverbindung und verwendung dieser schweissmanschette
EP0258827A1 (de) * 1986-08-28 1988-03-09 Tarco Energi A/S Verfahren zur Verbindung eines Kunststoffrohrendes mit einer schweissbaren Kunststoffhülse
DE19652712C1 (de) * 1996-12-18 1998-02-05 Bem Gmbh Verbindung von Doppelrohren
EP1087171A1 (de) * 1999-08-27 2001-03-28 Star Pipe, AS Dansk Rorindustri Elektroschweissmuffe und Verfahren zu ihrer Herstellung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3702912A1 (de) * 1986-06-05 1987-12-10 Kabelmetal Electro Gmbh Verfahren zur regelung des schweissvorganges bei der herstellung einer muffenverbindung fuer waermeisolierte leitungsrohre
DE3720577A1 (de) * 1986-07-31 1988-02-04 Meier Schenk Ag Schweissmanschette zur herstellung einer rohrverbindung und verwendung dieser schweissmanschette
EP0258827A1 (de) * 1986-08-28 1988-03-09 Tarco Energi A/S Verfahren zur Verbindung eines Kunststoffrohrendes mit einer schweissbaren Kunststoffhülse
DE19652712C1 (de) * 1996-12-18 1998-02-05 Bem Gmbh Verbindung von Doppelrohren
EP1087171A1 (de) * 1999-08-27 2001-03-28 Star Pipe, AS Dansk Rorindustri Elektroschweissmuffe und Verfahren zu ihrer Herstellung

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DE10211703A1 (de) 2003-09-25
ITRM20030091A0 (it) 2003-02-28

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