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
  • F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
  • F16L39/005—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies for concentric pipes

Definitions

• the invention relates to a connection of outer protective pipes of a double pipe system, as characterized in the preamble of claim 1.
• safety piping systems are often required, which have an inner pipeline line that transmits the medium and an outer pipeline line, which in the event of breaks or leaks in the inner pipeline line Medium can be caught in the outer pipeline to avoid accidents.
• these can be fertilizers are moved in such a way that access to the inner pipe string is ensured over the entire length of the space between the protective pipes arranged at a distance for the purpose of establishing a connection and / or testing a connection of the inner pipes for leaks.
• Fig. 2 shows the connection of the protective tubes in a first phase in a partial section of Fig. 1 and
• 1 shows a double pipe system with an inner pipe string 1 conducting the medium and an outer pipe string 2.
• Pipes 10, 11 of the inner pipe string 1 are connected by means of a socket connection 12, for example by gluing or welding.
• the two pipes 10, 11 can, for example, also be connected to one another in a medium-tight manner by a butt weld connection or by a releasable screw connection, the type of connection also depending on the plastic used in the inner pipe string 1.
• the outer pipe string 2 has two protective pipes 20 and 21 which are arranged in the area of the connection 12 of the inner pipe string 1 for their accessibility with a distance D from one another.
• sleeves 23 and 24 are pushed onto the protective tubes 20 and 21 and inner sleeves 25, 26 and a pipe section 27 are arranged between the protective tubes 20, 21.
• the two inner sleeves 25, 26 are each shifted on both sides to the front ends of the protective tubes 20, 21, the pipe section 27 lying in one of the inner sleeves 26 and partially inserted into the interior of one of the protective tubes 21 is. This creates a free distance d in the middle for accessibility to the inner pipe string 1.
• This accessibility can be increased by pushing both inner sleeves 25 and 26, as can be seen in FIG. 1 below, on " one side, so that overall after moving to the other side, the inner pipe string 1 has the length corresponding to the distance D is accessible.
• the sleeves 23, 24 and 25, 26 are designed as electric welding sleeves with a heating winding 28 arranged on the inner circumference and with connection ends 29 for connection to an electrical power source.
• Fig. 2 shows the first phase for producing the solid and medium-tight connection 22 of the protective tubes 20, 21, wherein the inner sleeves 25, 26 on both sides of the end ' * ends of the protective tubes 20, 21 connected to the pipe section 27 by welding become.
• the welding is carried out in a known manner by supplying current to the heating windings 28, the thermoplastic material being melted from the inner circumference of the sleeves 25, 26 and, after cooling, a firm connection to the pipe section 27 is produced.
• the second phase of the connection is shown in Fig. 3, wherein after removing the connection ends 29 on the inner sleeves 25, 26, the two sleeves 23 and 24 are pushed with a half on the outer circumference of the inner sleeves 25 and 26 and the ends of the Protective tubes 20 and 21 are firmly connected to the inner sleeves 25 and 26 by welding in a known manner.
• Polyethylene is preferably used for the outer pipe string, so that commercially available electrical welding sleeves can also be used for this, in particular for connecting the * protective tubes 20, 21 to the inner welding sleeves 25, 26.
• the welded connections can also be made by inductive heating, by heating by means of heating elements or by contactless heat radiation getting produced.
• a firm socket connection can also be produced by gluing if appropriate plastics such as polyvinyl chloride are used for sockets and pipes.
• connection according to the invention of the outer protective tubes of a double tube system can be used for the following purposes:

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=4267325

Family Applications (1)

Country Status (2)

Cited By (4)

Citations (3)

• 1988
  • 1988-10-25 CH CH396888A patent/CH677014A5/de not_active IP Right Cessation
• 1989
  • 1989-10-04 WO PCT/CH1989/000179 patent/WO1990004736A1/de unknown

Patent Citations (3)

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