DE4039863C1 - Insulated double pipe - has nested pipes with foaming heat insulation in between, plus leakage sensor line below inner pipe, screened from insulation by cover film - Google Patents

Insulated double pipe - has nested pipes with foaming heat insulation in between, plus leakage sensor line below inner pipe, screened from insulation by cover film

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Publication number
DE4039863C1
DE4039863C1 DE4039863A DE4039863A DE4039863C1 DE 4039863 C1 DE4039863 C1 DE 4039863C1 DE 4039863 A DE4039863 A DE 4039863A DE 4039863 A DE4039863 A DE 4039863A DE 4039863 C1 DE4039863 C1 DE 4039863C1
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DE
Germany
Prior art keywords
sensor line
leakage sensor
pipe
cover film
inner tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE4039863A
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German (de)
Inventor
Rolf 4173 Kerken De Timmel
Bernd Dr. 4154 Toenisvorst De Schroers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
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Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Priority to DE4039863A priority Critical patent/DE4039863C1/en
Application granted granted Critical
Publication of DE4039863C1 publication Critical patent/DE4039863C1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/02—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having conical surfaces; Packings therefor
    • 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
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
    • 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
    • F16L59/143—Pre-insulated pipes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G01M3/165—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means by means of cables or similar elongated devices, e.g. tapes

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Insulation (AREA)

Abstract

The dual pipe comprises inner and outer pipes whose interval is packed with in situ foaming heat insulating jacket material, plus a leakage sensor line run below the inner pipe. The sensor line (3) should be screened from the insulating jacket material (6) by a cover film (4). The line is sited between film and inner pipe (2). The film pref. bears on the pipe on both sides of the line or is joined here to the pipe. ADVANTAGE - Cover film shields line from jacket foam and so prevents line being isolated and deprived of useful function.

Description

Die Erfindung betrifft ein Doppelrohr für wärmegedämmte Leitung, bestehend aus einem Innenrohr und einem Außenrohr mit einem dazwischen angeordneten, in-situ-geschäumten Wärmedämm-Mantel aus wärmedämmendem Schaumstoff, wobei unter dem Innenrohr eine Leckage-Sensorleitung angeordnet ist, sowie ein Verfahren zur Herstellung dieses Doppelrohres.The invention relates to a double pipe for thermally insulated line, consisting of an inner tube and an outer tube with an intermediate one, in-situ foamed thermal insulation jacket made of thermal insulation foam, a leakage sensor line is arranged under the inner tube, and a Process for the production of this double pipe.

Bei Doppelrohren dieser Art wird der Wärmedämm-Mantel in der Regel dadurch erzeugt, daß man ein flüssiges Reaktionsgemisch, welches Hartschaumstoff, insbesondere Polyurethan-Hartschaumstoff, bildet, zwischen die beiden Rohre einbringt und aufschäumen läßt. Das Arbeiten mit blähfähigem Polystyrolgranulat zur Bildung eines Wärmedämm-Mantels aus Schaumstoff ist zwar auch möglich, wird aber weniger praktiziert. Der Leckage-Sensor arbeitet in der Regel nach dem konduktiven Prinzip und benötigt die Leiterüberbrückung der Signalleiterdrähte der Sensorleitung durch das Leckage-Medium. Durch die Nutzung von Widerstandsdraht läßt sich durch Widerstandsmessung die Leckagestelle orten. Es hat sich gezeigt, daß beim Ausschäumen die Signalleiterdrähte der Leckage-Sensorleitung bei der Schaumstoffbildung eine Isolierung erfahren und ihre Funktion nicht mehr ausüben, wenn eine Überbrückung durch das Leckage-Medium nicht mehr möglich ist.With double pipes of this type, the thermal insulation jacket is usually produces that a liquid reaction mixture, which rigid foam, especially rigid polyurethane foam, forms between the two tubes brings in and lets foam. Working with expandable polystyrene granules to form a thermal insulation jacket made of foam is also possible but is practiced less. The leakage sensor usually works according to the conductive principle and requires the bridging of the signal conductor wires Sensor line through the leakage medium. By using resistance wire the leakage point can be located by measuring the resistance. It has shown that when foaming the signal conductor wires of the leakage sensor line experience insulation during foam formation and no longer function exercise when it is no longer possible to bypass the leakage medium is.

Es besteht die Aufgabe, einen Aufbau und ein Herstellungsverfahren für das Doppelrohr zu finden, wobei die Funktionsfähigkeit der Leckage-Sensorleitung erhalten bleibt.There is a task, a structure and a manufacturing process for the Find double pipe, the functionality of the leakage sensor line preserved.

Diese Aufgabe wird dadurch gelöst, daß die Leckage-Sonderleitung gegenüber dem Wärmedämm-Mantel durch eine Abdeckfolie abgeschirmt ist, wobei die Leckage- Sensorleitung zwischen dieser Abdeckfolie und dem Innenrohr plaziert ist.This object is achieved in that the leakage special line compared to the Thermal insulation jacket is shielded by a cover film, the leakage Sensor line is placed between this cover and the inner tube.

Durch diese Maßnahme wird erreicht, daß beim Aufschäumen des Raumes zwischen den beiden Rohren zur Bildung des Wärmedämm-Mantels die Leckage- Sensorleitung nicht durch Schaumstoff elektrisch isoliert wird.This measure ensures that when the room is foamed the leakage between the two pipes to form the thermal insulation jacket Sensor cable is not electrically insulated by foam.

Gemäß einer ersten Ausführungsform liegt die Abdeckfolie beidseitig der Leckage- Sensorleitung an dem Innenrohr an bzw. ist mit dem Innenrohr verbunden.According to a first embodiment, the cover film lies on both sides of the leakage Sensor line on the inner tube or is connected to the inner tube.

Theoretisch ist ein Verbinden, insbesondere Verkleben, mit dem Innenrohr nicht nötig; für die Praxis ist es jedoch zu empfehlen, weil dadurch sichergestellt ist, daß die Abdeckfolie, welche in diesem Falle in Form eines Streifens verwendet wird, plaziert gehalten wird, und um das Eindringen von schaumstoffbildendem Material zwischen Folie und Innenrohr zu vermeiden.Theoretically, a connection, in particular gluing, to the inner tube is not necessary; in practice, however, it is recommended because it ensures that the Covering film, which in this case is used in the form of a strip, placed is held, and the penetration of foam-forming material to avoid between film and inner tube.

Es ist dabei jedoch nicht erwünscht, daß die Verbindung lange hält. Im Prinzip ist es am günstigsten, wenn sich eine solche abdichtende Haftung oder Verklebung möglichst sofort nach dem Aushärten des Schaumstoffes wieder löst, damit nicht nur solches Leckage-Medium an die Leckage-Sensorleitung gelangt, welches aus dem Innenrohr in dem von der Abdeckfolie abgedeckten Bereich austritt, sondern auch solches, wie es irgendwo am Umfang des Innenrohres durchkommt. Man wählt deshalb vorzugsweise einen Kleber, dessen Klebkraft schnell nachläßt oder welcher bald versprödet. Alternativ hierzu läßt sich auch für die Abdeckfolie ein Material verwenden, welches permeabel für Leckage-Medium ist, nicht jedoch für schaumstoffbildende Materialien oder flüssige Reaktionsgemische. Es lassen sich auch Folienmaterialien, insbesondere geeignete Kunststoffe, wählen, welche bei höheren Temperaturen verspröden und brüchig werden. Dies kann beispielsweise durch die beim Aufschäumen entstehende Temperatur geschehen oder durch Beschickung des Innenrohres mit Dampf, nachdem die Erzeugung des Wärmedämm-Mantels beendet ist.However, it is not desirable that the connection last long. In principle it is It is best if there is such a sealing adhesion or adhesive as possible dissolves immediately after the foam has cured, and not only such leakage medium reaches the leakage sensor line, which comes from the Inner tube emerges in the area covered by the cover film, but also such as it gets through somewhere on the circumference of the inner tube. So you choose preferably an adhesive whose adhesive strength quickly deteriorates or which soon embrittled. Alternatively, a material can also be used for the cover film use, which is permeable for leakage medium, but not for foam-forming Materials or liquid reaction mixtures. It can also be Select film materials, especially suitable plastics, which are used for higher  Temperatures become brittle and become brittle. This can be done, for example, by happen at the foaming temperature or by loading the Inner tube with steam after the generation of the thermal insulation jacket ends is.

Gemäß einer weiteren Ausführungsform besteht die Abdeckfolie aus einer das Innenrohr und die Leckage-Rohrleitung gemeinsam umschließenden Schlauchfolie. Hierbei braucht die Schlauchfolie weder mit dem Innenrohr verklebt zu sein noch muß sie permeabel sein, da irgendwo am Innenrohr austretendes Leckage-Medium zwangsläufig mit der Leckage-Sensorleitung in Kontakt kommt. Eine solche Schlauchfolie kann auch aus einer Wicklung bestehen, deren Windungen genügend überlappen müssen, damit das schaumstoffbildende Material nicht zwischen die Windungen eindringen kann.According to a further embodiment, the cover film consists of a Inner tube and the leakage pipeline together enclosing tubular film. The tubular film does not need to be glued to the inner tube here it must be permeable, since leakage medium escaping somewhere on the inner tube inevitably comes into contact with the leakage sensor line. Such Tubular film can also consist of a winding, the windings of which are sufficient must overlap so that the foam-forming material does not between the Windings can penetrate.

Das neue Verfahren zur Herstellung eines Doppelrohres für wärmegedämmte Leitung geht davon aus, daß ein Innenrohr mit einer unter ihm angeordneten Leckage-Sensorleitung in ein Außenrohr koaxial eingeschoben und in den Zwischenraum ein wärmedämmendes, schaumstoffbildendes Material eingebracht wird.The new process for the production of a double pipe for thermally insulated pipes assumes that an inner tube with one located below it Leakage sensor cable is inserted coaxially into an outer tube and into the Intermediate space introduced a heat-insulating, foam-forming material becomes.

Das Neue ist darin zu sehen, daß vor dem Einscheiben des Innenrohres mit Leckage-Sensorleitung in das Außenrohr die Leckage-Sensorleitung mit einer Abdeckfolie abgedeckt wird.The new thing is to be seen in the fact that before the inner tube is inserted Leakage sensor line in the outer tube with a leakage sensor line Covering film is covered.

Auf diese Weise läßt sich das neuartige Doppelrohr in recht einfacher Weise herstellen.In this way, the novel double tube can be produced in a very simple manner.

Es ist bei dieser Verfahrensweise sichergestellt, daß das aufschäumende Material nicht mit der Leckage-Sensorleitung in Kontakt kommen kann, so daß ihre Funktionsfähigkeit erhalten bleibt.This procedure ensures that the foaming material cannot come into contact with the leakage sensor line, so that its functionality preserved.

Vorzugsweise wird als Folie ein Streifen verwendet, welcher beidseitig der Sensorleitung mit dem Innenrohr verklebt wird. Preferably, a strip is used as the film, which on both sides of the Sensor cable is glued to the inner tube.  

Es wird auf die obigen Ausführungen zur Gestaltung des Doppelrohres verwiesen, und zwar insbesondere darauf, daß sich die Verklebung nach der Bildung des Wärmedämm-Mantels wieder lösen kann bzw. gelöst werden soll.Reference is made to the above explanations regarding the design of the double tube, in particular, that the bond after the formation of the Thermal insulation jacket can loosen again or should be solved.

Gemäß einer weiteren Durchführungsform des neuen Verfahrens wird als Abdeckfolie eine Schlauchfolie verwendet, in welche das Innenrohr mit der Leckage- Sensorleitung eingeschoben wird.According to a further embodiment of the new method, it is used as a cover film uses a tubular film in which the inner tube with the leakage Sensor cable is inserted.

Alternativ hierzu wird eine Flachfolie um Innenrohr und Leckage-Sensorleitung gelegt und zu einem Schlauch verschweißt.Alternatively, there is a flat film around the inner tube and leakage sensor line placed and welded to a hose.

In der Zeichnung ist das neue Doppelrohr in zwei Ausführungsbeispielen im Querschnitt rein schematisch dargestellt und nachstehend näher erläutert. Es zeigtIn the drawing, the new double tube is in cross section in two exemplary embodiments shown purely schematically and explained in more detail below. It shows

Fig. 1 eine Ausführungsform mit einem Abdeckstreifen und Fig. 1 shows an embodiment with a cover strip and

Fig. 2 eine Ausführungsform mit einer Schlauchfolie. Fig. 2 shows an embodiment with a tubular film.

In Fig. 1 besteht das Doppelrohr aus einem Außenrohr 1 und einem Innenrohr 2 sowie einer unter dem Innenrohr 2 angeordneten Leckage-Sensorleitung 3. Diese ist durch eine aus einem Kunststoffstreifen aus Polyethylen bestehende Abdeckfolie 4, die an den Rändern Klebestreifen 5 aufweist, mit dem Innenrohr 2 verklebt gewesen. Der zwischen dem Außenrohr 1 und dem Innenrohr 2 verbleibende Raum ist durch einen Wärmedämm-Mantel 6 aus Polyurethan-Hartschaum ausgefüllt. Er wurde durch Einbringen eines schaumstoffbildenden Reaktionsgemisches erzeugt. Nach dem Aushärten des Wärmedämm-Mantels 6 hat sich die Verklebung der Abdeckfolie 4 durch gezieltes Nachlassen der Klebkraft gelöst.In Fig. 1, the double pipe consists of an outer pipe 1 and an inner pipe 2 and a leakage sensor line 3 arranged under the inner pipe 2 . This was glued to the inner tube 2 by a cover film 4 consisting of a plastic strip of polyethylene, which has adhesive strips 5 at the edges. The space remaining between the outer tube 1 and the inner tube 2 is filled by a thermal insulation jacket 6 made of rigid polyurethane foam. It was generated by introducing a foam-forming reaction mixture. After the thermal insulation jacket 6 has hardened, the adhesive bonding of the cover film 4 has been released by deliberately reducing the adhesive force.

In Fig. 2 besteht das Doppelrohr aus einem Außenrohr 21 und einem Innenrohr 22 sowie einer unter dem Innenrohr 22 angeordneten Leckage-Sensorleitung 23. Innenrohr 22 und Leckage-Sensorleitung 23 sind gemeinsam von einer als Schlauch ausgebildeten Abdeckfolie 24 aus Polyamid umgeben. Der zwischen der Abdeckfolie 24 und dem Außenrohr 21 verbleibende Raum ist mit einem Wärmedämm-Mantel 25 aus Polyurethan-Hartschaumstoff ausgefüllt, welcher durch Einbringen eines flüssigen Reaktionsgemisches erzeugt wurde.In FIG. 2, the double tube of an outer tube 21 and an inner tube 22 and a disposed below the inner tube 22 is leakage sensor line 23. Inner tube 22 and leakage sensor line 23 are jointly surrounded by a polyamide cover film 24 formed as a tube. The space remaining between the cover film 24 and the outer tube 21 is filled with a thermal insulation jacket 25 made of rigid polyurethane foam, which was produced by introducing a liquid reaction mixture.

Claims (8)

1. Doppelrohr für wärmegedämmte Leitung, bestehend aus einem Innenrohr (2, 22) und einem Außenrohr (1, 21) mit einem dazwischen angeordneten, in- situ-geschäumten Wärmedämm-Mantel (6, 25) aus wärmedämmendem Schaumstoff, wobei unter dem Innenrohr (2, 22) eine Leckage-Sensorleitung (3, 23) angeordnet ist, dadurch gekennzeichnet, daß die Leckage-Sensorleitung (3, 23) gegenüber dem Wärmedämm-Mantel (6, 25) durch eine Abdeckfolie (4, 24) abgeschirmt ist, wobei die Leckage-Sensorleitung (3, 23) zwischen dieser Abdeckfolie (4, 24) und dem Innenrohr (2, 22) plaziert ist.1. Double pipe for thermally insulated pipe, consisting of an inner pipe ( 2, 22 ) and an outer pipe ( 1, 21 ) with an in-situ foamed thermal insulation jacket ( 6, 25 ) made of heat-insulating foam, located under the inner pipe ( 2, 22 ) a leakage sensor line ( 3, 23 ) is arranged, characterized in that the leakage sensor line ( 3, 23 ) is shielded from the thermal insulation jacket ( 6, 25 ) by a cover film ( 4, 24 ) The leakage sensor line ( 3, 23 ) is placed between this cover film ( 4, 24 ) and the inner tube ( 2, 22 ). 2. Doppelrohr nach Anspruch 1, dadurch gekennzeichnet, daß die Abdeckfolie (4) beidseitig der Leckage-Sensorleitung (3) an dem Innenrohr (2) anliegt.2. Double pipe according to claim 1, characterized in that the cover film ( 4 ) on both sides of the leakage sensor line ( 3 ) abuts the inner tube ( 2 ). 3. Doppelrohr nach Anspruch 2, dadurch gekennzeichnet, daß die Abdeckfolie (4) beidseitig der Leckage-Sensorleitung (3) mit dem Innenrohr (2) verbunden ist.3. Double tube according to claim 2, characterized in that the cover film ( 4 ) on both sides of the leakage sensor line ( 3 ) is connected to the inner tube ( 2 ). 4. Doppelrohr nach einem der Ansprüche 1, 2 oder 3, dadurch gekennzeichnet, daß die Abdeckfolie (24) aus einer das Innenrohr (22) und die Leckage- Sensorleitung (23) gemeinsam umschließenden Schlauchfolie (24) besteht.4. Double pipe according to one of claims 1, 2 or 3, characterized in that the cover film ( 24 ) consists of a tubular film ( 24 ) enclosing the inner pipe ( 22 ) and the leakage sensor line ( 23 ) together. 5. Verfahren zur Herstellung eines Doppelrohres für eine wärmegedämmte Leitung, wobei ein Innenrohr (2, 22) mit einer unter ihm angeordneten Leckage-Sensorleitung (3, 23) in ein Außenrohr (1, 21) koaxial eingeschoben und in den Zwischenraum ein wärmedämmendes, schaumstoffbildendes Material eingebracht wird, dadurch gekennzeichnet, daß vor dem Einschieben des Innenrohres (2, 22) mit Leckage-Sensorleitung (3, 23) in das Außenrohr (2, 22) die Leckage-Sensorleitung (3, 23) mit einer Abdeckfolie (4, 24) abgedeckt wird. 5. A method for producing a double pipe for a heat-insulated line, an inner pipe ( 2, 22 ) with a leakage sensor line ( 3, 23 ) arranged beneath it being pushed coaxially into an outer pipe ( 1, 21 ) and a heat-insulating, Foam-forming material is introduced, characterized in that before inserting the inner tube ( 2, 22 ) with leakage sensor line ( 3, 23 ) into the outer tube ( 2, 22 ), the leakage sensor line ( 3, 23 ) with a cover film ( 4 , 24 ) is covered. 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß als Abdeckfolie (4) ein Streifen verwendet wird, welcher beidseitig der Leckage-Sensorleitung (3) mit dem Innenrohr (2) verklebt wird.6. The method according to claim 5, characterized in that a strip is used as the cover film ( 4 ), which is glued on both sides of the leakage sensor line ( 3 ) with the inner tube ( 2 ). 7. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß als Abdeckfolie (24) eine Schlauchfolie verwendet wird, in welche das Innenrohr (22) zusammen mit der Leckage-Sensorleitung (23) eingeschoben wird.7. The method according to claim 5, characterized in that a tubular film is used as the cover film ( 24 ), in which the inner tube ( 22 ) is inserted together with the leakage sensor line ( 23 ). 8. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß als Abdeckfolie (24) eine Flachfolie um Innenrohr (22) und Leckage-Sensorleitung (23) gelegt und zu einem Schlauch verschweißt wird.8. The method according to claim 5, characterized in that as a cover film ( 24 ) a flat film around the inner tube ( 22 ) and leakage sensor line ( 23 ) is placed and welded to form a hose.
DE4039863A 1990-12-13 1990-12-13 Insulated double pipe - has nested pipes with foaming heat insulation in between, plus leakage sensor line below inner pipe, screened from insulation by cover film Expired - Lifetime DE4039863C1 (en)

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DE4039863A DE4039863C1 (en) 1990-12-13 1990-12-13 Insulated double pipe - has nested pipes with foaming heat insulation in between, plus leakage sensor line below inner pipe, screened from insulation by cover film

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DE4039863A DE4039863C1 (en) 1990-12-13 1990-12-13 Insulated double pipe - has nested pipes with foaming heat insulation in between, plus leakage sensor line below inner pipe, screened from insulation by cover film

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Cited By (12)

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DE4431367A1 (en) * 1994-08-27 1996-02-29 Bernd Brandes Method for monitoring the tightness of pipelines, in particular sewage systems, and a device for carrying out the method
DE19618370C1 (en) * 1996-05-09 1997-08-21 Gesundheitstechnik Anton Kastn Method manufacturing pipe section for heat-insulated pipe conduit
DE29800181U1 (en) * 1998-01-08 1998-03-05 Alcatel Alsthom Compagnie Générale d'Electricité, Paris Arrangement for the transmission of optical signals
EP0889012A1 (en) * 1997-07-01 1999-01-07 Daimler-Benz Aktiengesellschaft Process for filling cavities in workpieces or semi-finished products and components for mounting in a vehicle
EP0967430A1 (en) * 1998-06-23 1999-12-29 Thomas, Karl-Wilhelm Method for manufacturing a channel of a insulated pipeline
DE19913012A1 (en) * 1999-03-23 2000-09-28 Gep Umwelttechnik Gmbh Rainwater delivery line e.g. for building water supply, has outer sleeve enclosing suction line with screw fitting and electrical sensor line with plug connection
DE10006497A1 (en) * 2000-02-14 2001-08-16 Alstom Power Schweiz Ag Baden System for heat recovery in a combination power plant
WO2012101262A1 (en) * 2011-01-27 2012-08-02 Faurecia Systemes D'echappement Method for manufacturing heating structures, heating containers, and corresponding structures and containers
DE102012112147A1 (en) * 2012-12-12 2014-06-12 Piller Entgrattechnik Gmbh Device for detecting leaks in a fluid line, in particular a high-pressure fluid line
WO2017102227A1 (en) * 2015-12-18 2017-06-22 Sandvik Materials Technology Deutschland Gmbh A method for manufacturing a tube of metal as well as a tube of metal
WO2018091543A1 (en) * 2016-11-16 2018-05-24 Sandvik Intellectual Property Ab A system and method for manufacturing a system
DE102017207587A1 (en) * 2017-05-05 2018-11-08 Steinzeug-Keramo GmbH Use of a buried pipe with longitudinal wall channels

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DE8912378U1 (en) * 1989-10-18 1990-01-25 Brust, Arnold, 6580 Idar-Oberstein Double pipe for the environmentally friendly drainage of liquid media

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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