Double Pipe System

Abstract

Double pipe system with a primary pipeline conducting a medium and a secondary pipeline which is arranged around the primary pipeline for protection, containing pipes and fittings of the primary pipeline, wherein the pipes and fittings of the primary pipeline are connected together, and pipes and fittings of the surrounding secondary pipeline, wherein the pipes are configured as one-piece plastics pipes and the fittings are configured as half-shells, wherein the half-shells of the fittings and the adjoining pipes of the secondary pipeline are connected together by means of electric welding sleeves, or in that the half-shells of the fittings and the adjoining fittings consisting of half-shells are connected together by means of electric welding sleeves.

Claims

1. A double pipe system (1) with a primary pipeline (2) conducting a medium and a secondary pipeline (3) which is arranged around the primary pipeline (2) for protection, containing pipes (4) and fittings (5) of the primary pipeline (2), comprising wherein the pipes (4) and fittings (5) of the primary pipeline (2) are connected together, and pipes (6) and fittings (7) of the surrounding secondary pipeline (3), wherein the pipes (6) are configured as one-piece plastics pipes and the fittings (7) are configured as half-shells (8), wherein the half-shells (8) of the fittings (7) and the adjoining pipes (6) of the secondary pipeline (3) are connected together by means of electric welding sleeves (9), or in that the half-shells (8) of the fittings (7) and the adjoining fittings (7) consisting of half-shells (8) are connected together by means of electric welding sleeves (9).

2. A double pipe system (1) according to claim 1, wherein the electric welding sleeves (9) are configured as one-piece hollow cylindrical sleeves.

3. A double pipe system (1) according to claim 1, wherein the half-shells (7) are formed by a parting plane running centrally through the fitting (7) along the axis.

4. A double pipe system (1) according to claim 1, wherein at least one half-shell (8) of a fitting (7) has a seal (10) running along a parting plane (11) running parallel to the axis, wherein the seal (10) in the region of the electric welding sleeve (9) creates a material connection with the half-shells (8) of the fitting (7) or the half-shells (7) and the electric welding sleeve (9).

5. A double pipe system (1) according to claim 1, wherein the pipes (4) and fittings (5) of the primary pipeline (2) are connected together by electric welding.

6. A double pipe system (1) according to claim 1, wherein the fittings (5) of the primary pipeline are configured as an electric welding sleeve (16).

7. A double pipe system (1) according to claim 1, wherein the fittings (5, 7) are configured as a T-piece, branching piece and/or as a curved piece.

8. A double pipe system (1) according to claim 1, wherein the half-shells (8) of the fitting in each case have a connecting piece (13) on the connection side, wherein the outer diameter of the connecting pieces (13) preferably corresponds to the outer diameter of the pipe (6).

9. A double pipe system (1) according to claim 1, wherein spacer elements (17) are arranged in the fittings (7), wherein the spacer elements (17) ensure the concentric arrangement of the primary pipeline and secondary pipeline to one another.

10. A double pipe system (1) according to claim 1, wherein at least one clip (18) is arranged in the fittings (7) in order to fix the half-shells (8) temporarily to the primary pipeline (2).

11. A method for the installation of the double pipe system according to claim 1, comprising: welding a sub-portion of the primary pipeline (2) to at least one fitting (5) and at least one pipe (4), temporarily arranging an electric welding sleeve (9) on the outer diameter of a pipe (6) of the secondary pipeline (3) which is to be pushed onto the primary pipeline (2), pushing the pipe (6), with the electric welding sleeve (9) of a secondary pipeline (3) temporarily arranged thereon, onto the pipeline portion of the sub-portion of the primary pipeline (2) welded to a fitting (5), attaching a fitting (7) of the secondary pipeline (3), preferably around a fitting (5) of the primary pipeline (2), by combining two half-shells (8), wherein the electric welding sleeve (9) which is temporarily arranged on the outer diameter of the pipe (6) of the secondary pipeline (3) is partially pushed over the fitting (7), consisting of the two half-shells (8), and welded.

Description

DRAWINGS

[0025] An exemplary embodiment of the invention is described with reference to the figures, wherein the invention is not merely limited to the exemplary embodiment. In the figures:

[0026] FIG. 1 shows a detail of a double pipe system according to the invention with only one half-shell,

[0027] FIG. 2 shows a half-shell of the double pipe system according to the invention,

[0028] FIG. 2a shows a half-shell of the double pipe system according to the invention, in which in the region of the connecting pieces the seal is arranged on the outside,

[0029] FIG. 3 shows a portion of a double pipe system according to the invention,

[0030] FIG. 4 shows the method according to the invention for the installation of the double pipeline system in steps,

[0031] FIG. 5 shows the method according to the invention for the installation of the double pipeline system in steps,

[0032] FIG. 6 shows the method according to the invention for the installation of the double pipeline system in steps,

[0033] FIG. 7 shows a detail of a double pipe system according to the invention shown with only one half-shell with visible clips and

[0034] FIG. 8 shows two fittings connected together with an electric welding sleeve.

DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

[0035] The drawing shown in FIG. 1 shows a three-dimensional view of a partially welded fitting 7 of the secondary pipeline 3, wherein the upper half-shell is masked out. The electric welding sleeve 9 shown on the right-hand side is already correctly placed on the fitting 7 and welded. However, the left-hand and lower electric welding sleeve 9 still has to be pushed onto the connecting piece 13 of the fitting 7. The double pipe system 1 according to the invention has a primary pipeline 2 through which medium circulates. The primary pipeline 2 has pipes 4 and fittings 5, which are welded together, preferably by electric welding sleeves 16, wherein other types of connection are also conceivable, such as for example adhesive bonding and butt welding. The primary pipeline 2 is preferably manufactured from plastics, wherein a metal pipeline is also perfectly conceivable as a primary pipeline.

[0036] Moreover, the double pipe system 1 according to the invention contains a secondary pipeline 3, which is arranged around the primary pipeline system 2. The secondary pipeline 3 serves for protecting the environment or for protecting personnel from injury due to media escaping from leaking primary pipeline systems 2. The secondary pipeline 3 contains pipes 6 and fittings 7, wherein the fittings 7 are configured as half-shells 8. The pipes 6 are configured as one-piece plastics pipes and generally manufactured by extrusion. The pipes 6 are pushed over the pipe 4 of the primary pipeline 2, wherein only a sub-portion of the primary pipeline 2 is installed in order then to install the secondary pipeline 3. The two half-shells 8 of the fitting 7 of the secondary pipeline 3 are attached around the corresponding position of the primary pipeline 2. Generally, the position is also that of a fitting 5 of the primary pipeline 2 as shown in FIG. 1. The half-shells 8 of the fittings 7 can also be attached at other positions, for example where they serve as a bearing point 18 at which the double pipe system 1 is fastened, which can also be identified in FIG. 3. For a concentric arrangement of the two pipelines 2, 3, the half-shells 8 have spacer elements 17 on which the fittings 5, 7 are concentrically spaced apart from one another. Additionally, the spacer elements serve for the axial positioning of the half-shells 8. In FIG. 1 the path of the seal 10 which extends along the edge or wall 12 of the half-shell 8 is clearly visible. When welding by means of the electric welding sleeves 9 arranged on the fittings 7 of the secondary pipeline 3, the seal 10 is connected by a material connection to the half-shells 8 in the region of the electric welding sleeves 9. FIG. 2 shows a half-shell 8 of a fitting 7 of a secondary pipeline 3. The connecting pieces 13 are clearly visible, the electric welding sleeve 9 being pushed thereon for welding the half-shells 8 or the fitting 7. The shoulder 15 which is formed by the smaller diameter of the connecting piece 13 relative to the central region 14 of the half-shell 8 or the fitting 7 produces a stop for the electric welding sleeve 9, whereby the sleeve is correspondingly correctly positioned. Additionally, in turn the path of the seal 10 along the edge 12 of the half-shell 8 is clearly visible in FIG. 2 The seal 10 runs in the parting plane 11 of two half-shells 8 which form a fitting 7. An exemplary embodiment in which the seal 10 runs centrally over the entire edge of the half-shell 8 is shown in FIG. 2. An exemplary embodiment in which the seal 10 is arranged on the outside in the region of the connecting pieces 13 on the outer diameter thereof is shown in FIG. 2a, so that when welded to the electric welding sleeve 9 it can be connected directly thereto by a material connection. FIG. 3 shows different fittings 7 which are configured as half-shells 8. As an example, a T-piece is shown as a 90° angle, wherein other fittings such as branching pieces, curved pieces or half-shells for fastening points which are configured as bearing points 18 are also conceivable.

[0037] FIGS. 4-6 show the method according to the invention for the installation of the double pipe system 1 in steps. FIG. 4 shows the sub-region of the primary pipeline 2 which is already installed, preferably by welding the pipes 4 and fittings 5 so that the pipe 6 of the secondary pipeline 3 can be pushed thereover. However, the sub-region of the primary pipeline 2 is only welded such that at least one side of the primary pipeline 2 remains accessible for the secondary pipeline 3 to be pushed on. Additionally, FIG. 4 shows the preparation of the pipe 6 of the secondary pipeline 3 by an electric welding sleeve 9 being temporarily arranged on the outer diameter of the pipe 6 and then the pipe 6 and the electric welding sleeves 9 arranged on both sides of the pipe being pushed onto the sub-region of the primary pipeline 2. FIG. 5 shows how the pipe 6, with the electric welding sleeves 9 arranged thereon, is pushed onto the primary pipeline 2. FIG. 6 shows the pipe 6 of the secondary pipeline 2 pushed onto the fitting 7. Then the electric welding sleeves 9 are pushed onto the connecting piece 13 of the fitting 7 as far as the shoulder 15. Then the electric welding sleeves 9 are welded. This results in a double pipe system 1 as shown in FIG. 3. FIG. 7 shows an open fitting 7 of the secondary pipeline 3 or a half-shell 8 with the primary pipeline 2 running therein. Clearly visible are the clips 18 which are attached therein and which fasten the half-shells 8 in a simple manner to the primary pipeline 3 for assembly. This provides the advantage of a simple temporary arrangement of the half-shells 8 on the primary pipeline 2, which makes it easier for the installer to fasten the second half-shell and push on the electric welding sleeve 9.

[0038] In FIG. 8 it is shown when two fittings 7 of the secondary pipeline 3 are directly welded together without a pipe piece therebetween. The electric welding sleeve 9 is then arranged in the centre of the two connecting pieces 13 of the fittings, wherein the axial positioning of the electric welding sleeve 9 is preferably predetermined by markings on the fittings.