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
  • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
  • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
  • F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
• • 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
  • F16L27/00—Adjustable joints, Joints allowing movement
  • F16L27/12—Adjustable joints, Joints allowing movement allowing substantial longitudinal adjustment or movement
• • 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
  • F16L27/00—Adjustable joints, Joints allowing movement
  • F16L27/12—Adjustable joints, Joints allowing movement allowing substantial longitudinal adjustment or movement
  • F16L27/127—Adjustable joints, Joints allowing movement allowing substantial longitudinal adjustment or movement with means for locking the longitudinal adjustment or movement in the final mounted position
  • F16L27/1273—Adjustable joints, Joints allowing movement allowing substantial longitudinal adjustment or movement with means for locking the longitudinal adjustment or movement in the final mounted position by quick-acting means
• • 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
  • F16L51/00—Expansion-compensation arrangements for pipe-lines
  • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube

Definitions

• the invention relates to a pipe joint member for use in the assembly of district heating pipes and similar supply pipes, said pipe joint member comprising two mutually telescopic parts with through flow, said parts being connected to a bellows so that each of the parts can be welded to the end of a district heating pipe and thereafter be telescoped in the axial direction.
• the establishing of a district heating pipeline usually takes place by the laying down of pipe lengths in a trench, after which the pipes are welded together in the formation of the pipeline.
• the district heating pipeline will hereby be so-called thermally pre-stretched, in that the pipe under a given temperature, which is normally around 50°C, will be exposed to tensile stresses, and above this temperature to compressive stresses.
• the muff is rigid after the welding together, the compressive effect will be absorbed by the unyielding pipeline as a permanent compressive stress. However, this can be absorbed by the pipe without difficulty during the operation.
• the weld must be carried out in the trench, where there can be both water and sludge, which is a great disadvantage.
• the trenches have to be filled in two stages, i.e. for the pipeline and subsequently for the assembly muffs after the welding.
• the pipe joint member as disclosed in claim 1, the one part of which comprises a piece which is conical on the outside with greatest diameter at the end, where said conical piece extends in a pipe portion on the second part, and where there is inserted a ring on the conical piece so that this piece with the ring can be displaced axially in the pipe portion by the compression, but where the ring will be clamped between the conical part and the pipe portion by subsequent stress effects on the pipes, the advantage is achieved that the whole of the pipe system, including the assembly member, can be established in one operation.
• the establishing of a pipeline system can hereby be carried out quickly, in that the laying down of the pipes, the insulation and the subsequent filling of the trench can be effected in one continuous operation.
• the ring will be able to expand without any danger of cracking when the tractive forces influence the parts for clamping together.
• fig. 1 shows a part section through a pipe joint member before the thermal pre-stretching of the system
• fig. 2 shows the same section after the thermal pre-stretching
• fig. 3 shows a second embodiment of a pipe joint member corresponding to that shown in f g. 1.
• the actual pipe joint member is mounted between to pipes 1 and 2 in such a manner that the medium can flow unhindered through the member.
• the pipe joint member comprises two parts, each of which is welded to a pipe end.
• the part shown at the right-hand side of the drawing is the movable part.
• This comprises a pipe piece 14 with substantially the same diameter as the medium pipe 1, and is welded to this by an annular weld 3.
• the pipe piece 14 On the external side around the middle the pipe piece 14 is provided with an annular rib 15 which, on its front side in the direction of movement, forms the starting point of a cone 16 which extends up to the end where its diameter is greatest.
• a bellows retaining pipe 5 In the opposite end of the movable part there is provided a bellows retaining pipe 5, the end of which is welded 13 to the outside of the medium pipe 1.
• a metal bellows 6 is welded to the retaining pipe 5 by an annular weld 7 which, as shown, can extend along the circumference of the retaining pipe 5 around the mean diameter for the bellows 6.
• the bellows 6 extends externally on the medium pipe 1 until around the joining weld 3 with the pipe piece 14, and at the end it is welded to an end piece 9 on the second part of the pipe joint member, which is the stationary part.
• the end piece 9 extends externally on the pipe piece 14 and has a turned-down part on which the bellows 6 is welded 8.
• the jacket forms an end-stop for the bellows retaining pipe 5, so that the movement of the movable part towards the right in the direction of expansion of the bellows is limited by the jacket 20.
• the middle of the end piece 9 is configured as a pipe piece
• a gasket 19 can be introduced between the two surfaces 12, 17.
• This ring 18 is dimensioned in such a manner that it can lie up against the dog 15 at the smallest diameter of the cone 16, and slide against the internal cylinder surface of the pipe piece 10 when the cone is displaced by the compression of the bellows.
• This member is produced as a unit with projecting pipe ends
• the ring 18 is divided into two segments, but several segments can be advantageous with large pipe joint members.
• the division into segments provides maximum security that the ring is expanded by the cone for contact with the inside surface of the pipe piece 10.
• a lining pipe 21 can be inserted along the inside of the cone 16 so that the cone is protected against direct influence from the medium flowing in the pipes.
• the pipe element is welded in while the medium pipes and the pipe joint member are at ambient temperature.
• the welding fast as to the one medium pipe 1, can with advantage be carried out beforehand, i.e. before the laying down in the trench, the result being that all that is necessary when assembling the pipeline in the trench is the welding 4 to the other medium pipe.
• the pipe joint member can be provided with external insulation upon delivery in such a manner that it .-a be welded to the ends of the pipes, which in a similar way can be provided with external insulation. Consequently, all welding and insulation work can be carried out before the laying down in the trench, and this can be filled up immediately after the laying down. This makes the assembly and laying-down work considerably more .simple and cheaper.
• hot water or steam is sent through the pipeline at a temperature of, for example, around 50°C.
• this condition will be the permanent state for the pipeline when the temperaure is, for example, above 50°C.
• the compression above this temperature will easily be able to be absorbed by the rigid pipeline system, which is secured against bending in the trench by the material with which the trench has been filled up.
• the ring 18 will hereby be wedged firmly between the cone surface and the wall of the pipe, whereby the cone 16 and herewith the whole of the movable part of the pipe joint member will be locked unmovably fast to the stationary part.
• the pre-stretched state of the pipeline system is hereby ensured, even at low temperatures, and this pre-stretched position will be maintained until the temperature rises again, after which the expansion will replace the tractive force with a compressive force, whereby the locking engagement is released, in that the cone wall 17 will again lie against the end wall 12.
• the function of the pipe joint member is a self-adjusting and completely automatic function which does not require any form of attention. Moreover, it is very beneficial to the pipeline system, in that it has a certain motility and herewith a tendency to serve as a buffer in the event of sudden changes of temperature.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Joints Allowing Movement (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8090476

Family Applications (1)

Country Status (3)

Cited By (4)

Citations (3)

• 1992
  • 1992-02-10 DK DK016392A patent/DK168312B1/da not_active IP Right Cessation
• 1993
  • 1993-02-10 WO PCT/DK1993/000047 patent/WO1993016311A1/en active Application Filing
  • 1993-02-10 AU AU34930/93A patent/AU3493093A/en not_active Abandoned

Patent Citations (3)

Also Published As

Similar Documents

Legal Events