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
  • 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

Definitions

• This invention relates to a method st joining of insulated pipes, which comprise an outer casing, an inner pipe and a heat insulating material located between the outer casing and the inner pipe, the end section of the inner pipe projecting a certain length outside the end surface of the heat insulating material and the outer casing in the end regions of the pipes intended for joining, a tubular mantle surrounding the outer casing being applied to one of two pipes intended for joining, the length of said mantle being greater than the total projecting length of the inner pipes, after which the ends of the projecting inner pipes are interconnected.
• the invention also relates to a device at joining of said insulated pipes.
• the pipe sectors are applied to inner pipes heated to normal working temperature, and this has the effect that the linesr measures of the prefabricated pipe sectors are adapted to this length, which in turn results in that the stresses in the glue lines will not be so great at additional rise of temperature as might otherwise be the case.
• Fig. 1 shows a longitudinal section of two insulated pipes being in contact with each other, the inner pipes of which are to be connected to each other, after which the place of the joint is to be insulated
• Fig. 2 shows a section taken along the line II-II in Fig. 1, i.e. a cross section of the insulated pipe
• Fig. 3 shows a longitudinal section of two pipes joined to each other where the place of joint is insulated in accordance with the invention
• Fig, 4 shows a section taken along the line IV-IV in Fig. 3
• Fig. 5 shows a section taken along the line V-V in Fig. 3.
• the insulated pipe 1 comprises an outer casing 2, an inner pipe 3 and a heat insulating material 4 placed between the outer casing 2 and the inner pipe 3.
• the end section 5 of the inner pipe 3 projects in the end regions of the pipes 1 intended for joining a certain length outside the end surface of the heat insulating material 4 and the casing 2.
• the joining operation is carried out in such a way that the projecting inner pipes 3 are first connected with each other. This can e.g. be done by welding, but of course a lot of other joining methods can be utilized .
• a joining sleeve of some kind can for instance be used.
• the adhesive is preferably of a type which expands at curing.
• the outer casing 2 is usually made of polyethylene, the inner pipe 3 of steel and the heat insulating material 4 of polyurethane foam. It is then of course also suitable to make the pipe sectors 20 and 21 of polyurethane foam and the tubular mantle 6 of polyethylene. Moreover, it is then also suitable to use a one-component polyurethane adhesive of a type curing by means of moisture. The adhesive should fill the joint and be suitable to use also where a bad joint adaptation is present and where both sealing and adhesive properties are suitable. In order to get a reasonable curing time current surfaces can be moistened by water.
• pipe sectors 20 and 21 these can mostly be prefabricated for a certain type of pipe as the projecting length of the inner pipe 3 is mostly constant.
• pipe sectors 20 and 21 of a definite cross section can be prefabricated but of a greater length than what is normally used. The desired lengths can then be cut at the place of use as desired.
• two pipe sectors have been used, but a greater number of pipe sectors can of course be selected within the scope of the invention if this is found suitable. possible

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=20355631

Family Applications (1)

Country Status (4)

Families Citing this family (3)

Family Cites Families (4)

• 1984
  • 1984-04-18 SE SE8402186A patent/SE8402186L/sv not_active Application Discontinuation
• 1985
  • 1985-04-17 EP EP85902200A patent/EP0179122A1/en active Pending
  • 1985-04-17 WO PCT/SE1985/000177 patent/WO1985004942A1/en not_active Application Discontinuation
  • 1985-12-17 FI FI855011A patent/FI855011L/fi not_active Application Discontinuation

Non-Patent Citations (1)

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