EP0138864A1 - Method of securing a shrink sleeve upon the outer ends of the insulating jacket of a thermally insulated conduit - Google Patents

Method of securing a shrink sleeve upon the outer ends of the insulating jacket of a thermally insulated conduit

Info

Publication number
EP0138864A1
EP0138864A1 EP84901019A EP84901019A EP0138864A1 EP 0138864 A1 EP0138864 A1 EP 0138864A1 EP 84901019 A EP84901019 A EP 84901019A EP 84901019 A EP84901019 A EP 84901019A EP 0138864 A1 EP0138864 A1 EP 0138864A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
jacket
shrink
shrink sleeve
insulating
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.)
Withdrawn
Application number
EP84901019A
Other languages
German (de)
French (fr)
Inventor
Willem Gerrit Van Der Wiel
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.)
ANIA BV
Original Assignee
ANIA BV
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 ANIA BV filed Critical ANIA BV
Publication of EP0138864A1 publication Critical patent/EP0138864A1/en
Withdrawn legal-status Critical Current

Links

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
    • B29C65/66—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
    • B29C65/68—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 using auxiliary shrinkable elements
    • 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
    • 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
    • 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"
    • B29C65/36—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" heated by induction
    • B29C65/3604—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" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362—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" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3632—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" heated by induction characterised by the type of elements heated by induction 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
    • B29C66/50—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
    • 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
    • B29C66/72—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
    • 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
    • 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
    • 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
    • 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
    • B29C65/02—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"
    • B29C65/36—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" heated by induction
    • B29C65/3672—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" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—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" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368—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" heated by induction characterised by the composition of the elements heated by induction 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
    • 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

Definitions

  • the invention relates to a method of securing a shrink sleeve upon the outer ends of the insulating jacket of thermoplastic synthetic material of a thermally insulated conduit, which shrink sleeve serves to bridge the welded ends of the inner tube and contains between said tube and the shrink sleeve as well as between the spaced apart ends of the jacket insulating material.
  • shrink sleeve With the shrink sleeve it is possible to seal the joint between two interconnected tube ends and the insulating material placed around it with respect to the environment in a faultless way.
  • the shrink sleeve can be placed with large clearance upon one end of an insulating jacket prior to making the joining weld, subsequently can be placed over the spaced apart ends of the insulating jackets of the interconnected tubes and thereafter can be activated to shrink with a burner or hot air device or by means of a little oven having two halves which are placed around it. Upon shrinkage the sleeve engages the ends of the insulating jacket under tension so that a dense connection is obtained.
  • a disadvantage of said known method is that the initially excellent connection in the long run loses quality in that the tension by means of which the shrink sleeve engages the insulating jacket gradually gets lost. The initially excellent connection then becomes a bad connection through which moisture can penetrate into the insulating material placed around the welded joint due to which the tube can start to corode there and the insulating material can be affected. Purpose of the invention is to provide a method in which said disadvantage cannot occur.
  • this purpose is achieved in that between the outer surface of the insulating jacket and the not yet shrunk sleeve an electric conductor is placed which eventually itself is surrounded by a thermoplastic synthetic material having in principle similar softening and melting properties as the synthetic material of the insulating jackets and of the shrink sleeve, after which the shrink sleeve is activated to shrink and after completion of said shrink the sleeve and the jacket are welded upon each other by electrical heating by means of the applied wires.
  • a melt connection is generated interconnecting the sleeve and insulating jacket permanently with each other due to which it no longer is of importance whether the clamping tension obtained by the shrinkage gets lost in the long run.
  • the shrink sleeve prior to being shrunk has sufficient clearance to apply the electric wire.
  • Said wire can be wound around the jacket after which the shrink sleeve is shifted over it, of course leaving the outer ends free which can be connected to a source of electric energy. After activating the shrinkage the electric wire is firmly clamped.
  • the method of the invention can be further simplified by taking as electric wire a wire having two cores which at one end are interconnected.
  • a wire only needs to be cleaned of coating at one end so that the two conductors can be twined after which the wire with at least one winding is put around the jacket whereafter the sleeve is shifted over it.
  • the drawing shows two tube sections 1 and 2 which e.g. by means of a V-welded seam 3 are interconnected. Said tubes 1 and 2 over the largest part of their length are surrounded by an insulating jacket 4 and 5 respectively made frcm a synthetic material. The space between the tubes 1 and 2 respectively and the jackets 4 and 5 respectively has been filled with an insulating material e.g. a foamed synthetic material 6 and 7 respectively.
  • an insulating material e.g. a foamed synthetic material 6 and 7 respectively.
  • a shrink sleeve made from a thermoplastic synthetic material is shifted over one of the jackets as indicated with interrupted lines at 8. Said shrink sleeve has been stretched such that it has a wide clearance 9 with respect to the jacket.
  • a double core electric conductor 10 is wound in the form of at least one winding. At one end the two cores are interconnected and at the other end connection can take place with the electric source 11 indicated diagrammatically. The shrink sleeve now easily can be shifted over the two windings 10 as indicated with interrupted lines at 12.
  • the space 13 around the welded seam 3 and between the outer ends of the insulating jackets 4, 6 and 5, 7 respectively can have been filled with insulating material prior to placing the sleeve 12 but this can take place at a later time as well by injection of a foaming resin.

Landscapes

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

Abstract

Procédé de fixation d'un manchon de retrait (12) sur les extrémités extérieures de la chemise isolante (4, 5) d'un conduit thermo-isolé (1, 2) en insérant un conducteur électrique (10) dans l'espace (9) séparant le manchon (12) de la chemise (4, 5) avant d'activer le retrait du manchon (12), tandis que l'on obtient, après réalisation du retrait, une connexion de fusion permanente entre le manchon et la chemise par chauffage électrique au moyen desdits fils.Method of fixing a withdrawal sleeve (12) on the outer ends of the insulating jacket (4, 5) of a thermally insulated conduit (1, 2) by inserting an electrical conductor (10) in the space ( 9) separating the sleeve (12) from the jacket (4, 5) before activating the withdrawal of the sleeve (12), while one obtains, after completion of the withdrawal, a permanent fusion connection between the sleeve and the jacket by electric heating by means of said wires.

Description

Method of securing a shrink sleeve upon the outer ends of the insulating jacket of a thermally insulated conduit.
The invention relates to a method of securing a shrink sleeve upon the outer ends of the insulating jacket of thermoplastic synthetic material of a thermally insulated conduit, which shrink sleeve serves to bridge the welded ends of the inner tube and contains between said tube and the shrink sleeve as well as between the spaced apart ends of the jacket insulating material. Such a method is known in practice. With the shrink sleeve it is possible to seal the joint between two interconnected tube ends and the insulating material placed around it with respect to the environment in a faultless way. The shrink sleeve can be placed with large clearance upon one end of an insulating jacket prior to making the joining weld, subsequently can be placed over the spaced apart ends of the insulating jackets of the interconnected tubes and thereafter can be activated to shrink with a burner or hot air device or by means of a little oven having two halves which are placed around it. Upon shrinkage the sleeve engages the ends of the insulating jacket under tension so that a dense connection is obtained.
A disadvantage of said known method is that the initially excellent connection in the long run loses quality in that the tension by means of which the shrink sleeve engages the insulating jacket gradually gets lost. The initially excellent connection then becomes a bad connection through which moisture can penetrate into the insulating material placed around the welded joint due to which the tube can start to corode there and the insulating material can be affected. Purpose of the invention is to provide a method in which said disadvantage cannot occur.
According to the invention this purpose is achieved in that between the outer surface of the insulating jacket and the not yet shrunk sleeve an electric conductor is placed which eventually itself is surrounded by a thermoplastic synthetic material having in principle similar softening and melting properties as the synthetic material of the insulating jackets and of the shrink sleeve, after which the shrink sleeve is activated to shrink and after completion of said shrink the sleeve and the jacket are welded upon each other by electrical heating by means of the applied wires.
According to the invention immediately after the shrink connection has been made a melt connection is generated interconnecting the sleeve and insulating jacket permanently with each other due to which it no longer is of importance whether the clamping tension obtained by the shrinkage gets lost in the long run. The shrink sleeve prior to being shrunk has sufficient clearance to apply the electric wire. Said wire can be wound around the jacket after which the shrink sleeve is shifted over it, of course leaving the outer ends free which can be connected to a source of electric energy. After activating the shrinkage the electric wire is firmly clamped. If said wire then is heated electrically up to a temperature at which the coating of the wire melts as well as the adjacent surfaces of the sleeve and of the jacket then, also under the influence of the clamping tension, an excellent melt connection is obtained. According to the invention use is made of the properties of the shrink sleeve and said properties are combined with the somewhere else known possibility of performing a weld by means of electric or inductive heating. The sleeve needs no additional provisions. Accordingly the invention makes it possible by making use of the any how present clearance at the not yet shrunk sleeve to generate a permanent connection without the necessity of more investments than an electric wire and a source of electric energy.
The method of the invention can be further simplified by taking as electric wire a wire having two cores which at one end are interconnected. Such a wire only needs to be cleaned of coating at one end so that the two conductors can be twined after which the wire with at least one winding is put around the jacket whereafter the sleeve is shifted over it.
The invention now will be further elucidated with reference to the drawing. Said drawing shows in cross section the place of interconnection of two thermally insulated tube sections.
The drawing shows two tube sections 1 and 2 which e.g. by means of a V-welded seam 3 are interconnected. Said tubes 1 and 2 over the largest part of their length are surrounded by an insulating jacket 4 and 5 respectively made frcm a synthetic material. The space between the tubes 1 and 2 respectively and the jackets 4 and 5 respectively has been filled with an insulating material e.g. a foamed synthetic material 6 and 7 respectively.
Prior to making the weld 3 a shrink sleeve made from a thermoplastic synthetic material is shifted over one of the jackets as indicated with interrupted lines at 8. Said shrink sleeve has been stretched such that it has a wide clearance 9 with respect to the jacket. Around each outer end of the jacket 4 and 5 respectively a double core electric conductor 10 is wound in the form of at least one winding. At one end the two cores are interconnected and at the other end connection can take place with the electric source 11 indicated diagrammatically. The shrink sleeve now easily can be shifted over the two windings 10 as indicated with interrupted lines at 12.
The space 13 around the welded seam 3 and between the outer ends of the insulating jackets 4, 6 and 5, 7 respectively can have been filled with insulating material prior to placing the sleeve 12 but this can take place at a later time as well by injection of a foaming resin.
After shifting the sleeve into the position indicated at 12 said sleeve is heated in a manner known per se due to which the sleeve shrinks and assumes the shape shown in the lower half of the drawing due to which said sleeve, as indicated in the left portion at 14, starts to ly around the electric conductor 10 with the clamping tension.
If thereafter current is supplied through the conductor 10 its coating 15 will melt and said coating merges with the synthetic material of the jacket 5 and of the synthetic material of the sleeve 12 so that the melt connection is generated as indicated at 16.

Claims

1. Method of securing a shrink sleeve upon the outer ends of the insulating jacket of thermoplastic synthetic material of a thermally insulated conduit, which shrink sleeve serves to bridge the welded ends of the inner tube and contains between said tube and the shrink sleeve as well as between the spaced apart ends of the jacket insulting material, characterized in that between the outer surface of the insulating jacket and the not yet shrunk sleeve an electric conductor is placed which eventually itself is surrounded by a thermoplastic synthetic material having in principle similar softening and melting properties as the synthetic material of the insulating jackets and of the shrink sleeve, after which the shrink sleeve is activated to shrink and after completion of said shrink the sleeve and the jacket are welded upon each other by electrical heating by means of the applied wires.
2. Method as claimed in claim 1, characterized in that an electric wire is used having two cores which at one end are interconnected.
EP84901019A 1983-02-24 1984-02-24 Method of securing a shrink sleeve upon the outer ends of the insulating jacket of a thermally insulated conduit Withdrawn EP0138864A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8300692A NL8300692A (en) 1983-02-24 1983-02-24 METHOD FOR ATTACHING A CRIMPING SOCKET ON THE ENDS OF THE INSULATING COAT OF A THERMALLY INSULATED PIPE.
NL8300692 1983-02-24

Publications (1)

Publication Number Publication Date
EP0138864A1 true EP0138864A1 (en) 1985-05-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84901019A Withdrawn EP0138864A1 (en) 1983-02-24 1984-02-24 Method of securing a shrink sleeve upon the outer ends of the insulating jacket of a thermally insulated conduit

Country Status (3)

Country Link
EP (1) EP0138864A1 (en)
NL (1) NL8300692A (en)
WO (1) WO1984003346A1 (en)

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Also Published As

Publication number Publication date
NL8300692A (en) 1984-09-17
WO1984003346A1 (en) 1984-08-30

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