DE7811209U1 - SLEEVE IN A PASSAGE OR BRANCH CONNECTION FOR THERMAL INSULATED PIPES - Google Patents

Description

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Cable and M eta 1 1 v erke
Gut ehoffnungshütte Aktiengesellschaft

1 1,600
05/22/1978

• C sleeve in a through or branch connection for heat-insulated Line pipes

The innovation relates to a socket in a passage or _;

Branch connection for heat-insulated line pipes, which consist of ρ

an inner tube carrying a preferably heated medium, j

preferably made of metal, coaxially to this angeordne- ψ th outer tube, preferably made of plastic and arranged between the tubes layer of foamed

Consist of plastic, l-egg of the freed from foam j,

Inner tubes are connected to one another in a fluid-tight manner and the \

The outer pipes are separated from the inner pipes and are marked with a §

socket pipe seated on both outer pipes connected \

and that between the Iimenpipes and the socket pipe I.

located space is subsequently filled with foam. G

When laying district heating lines, in addition to
so-called hood channel procedure, a procedure is enforced,
with the factory pre-insulated conduit directly in the
To be laid in the ground. These are so-called
District heating cables on standard cable drums in lengths of up to

7811209 08/24/78

up to 3OO ^m - can be inserted directly from the cable drum into the installation shaft. The advantage of the pipe type mentioned below is to be seen in the fact that, due to the great length, no connection points are necessary. Furthermore, c pre-insulated rigid pipes are known, which are delivered in lengths of up to 15 '' to the assembly and must be connected to one another there. When connecting the rigid pipes, the procedure is to first remove the outer pipe and remove the foam layer from the inner

IQ pipe removed, then a so-called sleeve pipe is pushed over one of the pipe ends and the inner pipes are connected to one another in a fluid-tight manner, preferably by welding. If the pipes are equipped with a leak detection system, the signaling wires of each pipe run are connected to one another in the area of the connection point, the socket pipe is pushed over the connection point so that it rests on the outer pipe of each pipe line and the space between the inner pipe and the socket pipe passes through Foam insulated. For this purpose, a foamable plastic mixture, preferably based on polyurethane, is introduced through a filling opening in the socket pipe, which completely foams the space.

It has now been shown that occasionally either the connection not carried out properly by the reporting officers or the The cavity was not completely filled with foam. An improper connection of the message wires leads to a Failure to display the leak detector while an incomplete Foaming of the annular space to heat loss in the area the through sleeve leads.

The innovation is therefore the object of the transit \ gangs- or branch connection to the effect of improving that one both the weld seam of the inner tube and the connects |

The setting of the message headers and the foaming in the area of the 1 pass-through point can be checked retrospectively. This |

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_ O _M

In the case of a socket of the type mentioned at the beginning, this is a task solved that the socket pipe consists of a transparent plastic. Come as material for the socket pipe both polyvinyl chloride and low molecular weight polyethylene in question. These materials can be processed into relatively transparent pipes in a particularly economical way, from which the socket pipe can be separated. A little more expensive but also much more transparent, for example in the manner of glass, are polycarbonate and polyacrylic acid esters. What all materials have in common, however, is that they are necessary Have compressive and impact strength and opposite the reactive foam mixture based on polyurethane are persistent. The ends of the socket pipe are opposite the outer pipe of the respective line pipe run sealed with shrink tubing. Similarly, will the filling opening for the foam mixture in the socket pipe subsequently sealed.

The innovation is shown schematically on the basis of one in the figure Embodiment explained in more detail.

To connect two pipes 1 and 2, each consisting of an inner pipe 3, an outer pipe 4 and a thermal insulation layer 5 based on, for example, polyurethane located between the pipes 3 and k , the outer pipe k and the heat insulation layer are first removed from each pipe end 5 deposited over a certain length. A sleeve pipe 6 is pushed over one of the line pipes 1 or 2 and the inner pipes 3 are connected to one another in a fluid-tight manner, preferably by a weld seam 7. If necessary, a signaling wire or a welding wire pair 8 is connected in the area of the passage sν connection. The socket pipe 6 is then pushed over the connection point so that it rests on the outer pipes h of both line pipes 1 and 2. According to the teaching of the innovation, the socket pipe consists of a transparent plastic, preferably based on polycarbonate, see above

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I t

1 It

that the proper execution of both the weld as well as the connection of the message headers 8 can be checked. Then is provided in the socket pipe 6 by a Insertion opening 9 is a schäuinbaren.iges plastic mixture, preferably filled on the basis of polyurethane, which the ring roughness between the inner pipes 3 and the socket pipe 6 fills in. You can also check that it has been completed in full. The ends of the socket pipe 6 are opposite the outer tube 4 by shrink tubing 10 and sealed. The filling opening can also be carried out in a similar manner 9 are closed.

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Claims (2)

Cable and metal works Gutehoffnungshütte Aktiengesellschaft 1 1,600 May 22, 1978 claims for protection 1. Sleeve in a through or branch connection for wärmc.isolies ^ e conduit pipes, which consist of an inner pipe carrying a preferably heated medium, preferably made of metal, an outer pipe arranged coaxially to this, preferably made of plastic and a layer arranged between the pipes foamed plastic, in which the inner pipes freed from foam are connected to one another in a fluid-tight manner and the outer pipes are separated from the inner pipes and connected by a socket pipe seated on both outer pipes and the space between the inner pipes and the socket pipe is subsequently filled with foam, characterized in that the socket pipe (6) consists of a clear plastic. 2. Sleeve according to claim 1, characterized in that the socket pipe (6) consists of a plastic based on polyvinyl chloride or Ni edermo liiku 1 arpolyät hylen. 7811209 08/24/78 3. Sleeve according to claim 1, characterized in that the sleeve pipe (6) consists of a plastic based on polycarbonate or polyacrylic acid ester. 7811209 08/24/78