EP0042491A1 - Plastic tube protective insert for a heat exchanger - Google Patents

Plastic tube protective insert for a heat exchanger Download PDF

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Publication number
EP0042491A1
EP0042491A1 EP81103766A EP81103766A EP0042491A1 EP 0042491 A1 EP0042491 A1 EP 0042491A1 EP 81103766 A EP81103766 A EP 81103766A EP 81103766 A EP81103766 A EP 81103766A EP 0042491 A1 EP0042491 A1 EP 0042491A1
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EP
European Patent Office
Prior art keywords
sleeve
lip seals
annular lip
pipe
cutting
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.)
Withdrawn
Application number
EP81103766A
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German (de)
French (fr)
Inventor
Wilhelm Rudolf Eisenkolb
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.)
Pampus Vermogensverwaltungs-Kg
Original Assignee
Pampus Vermogensverwaltungs-Kg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pampus Vermogensverwaltungs-Kg filed Critical Pampus Vermogensverwaltungs-Kg
Publication of EP0042491A1 publication Critical patent/EP0042491A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/002—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using inserts or attachments

Definitions

  • the invention relates to a protective tube made of a thermoplastic, preferably polyamide, with a collar at one end for insertion into word exchange tubes.
  • tube protection sleeves are primarily used on tube bundle heat exchangers to prevent corrosion, as are common for many purposes in process engineering.
  • the heat exchanger tubes are welded or crimped at a short distance into perforated plates at the head ends.
  • the transitions between the heat exchanger tube and the perforated plate or the initial parts of the heat exchanger tubes are subject to erosion corrosion by the liquid flow and often also contact corrosion by changing the structure during welding or by element formation, if different materials for Pipes and perforated plates can be used.
  • the sleeve according to the above-mentioned GM has on its outside, at the end at which the sleeve extends like a collar over the metal tube, a recess in which the excess amount of adhesive can be absorbed when the plastic sleeve coated with adhesive is inserted into the metal tube.
  • the adhesive connection between the sleeve and the tube wall or perforated plate which is intended to ensure that no corrosive medium penetrates between the sleeve and the metal, requires a considerable amount of work when gluing. It is necessary that the viscous adhesive is applied evenly in a thin layer on the outside of the sleeve and the sleeve is carefully inserted into the tube. In addition, in most cases it is only possible to work with a two-component adhesive, a fact that, particularly when retrofitting heat exchangers with protective sleeves, requires laborious preparatory work and a lot of work.
  • the object of the invention is to design the outside of the sleeve so that no liquid can penetrate between the sleeve and the metal wall and at the same time no adhesive for the binding is needed.
  • the ring-shaped lip seals can be made of the same plastic as the protective sleeve. By repeating this lip seal several times, a kind of labyrinth seal is created, which certainly prevents liquids from penetrating into the gap. The effect of the lip seal can be improved at the same time by the known swelling behavior of the inserted plastic sleeve.
  • the plastic sleeves are usually manufactured using the injection molding process.
  • the lip seals which are made of the same plastic material, can subsequently be mechanically formed on the outer surface of the sleeve or they are produced immediately during production by appropriately trained injection molding tools.
  • the lip seals can be produced on the plastic surface, for example by non-cutting or cutting, or they can be rolled on the surface by mechanical pressing. Although these operations require an additional operation, they do not require a complicated injection molding tool. If the lip seal is to be produced on the surface immediately during injection molding, a baking tool is required, which requires more effort.
  • Fig. 2 shows an enlarged section of the wall of the tube protective sleeve
  • the sealing lips shown here have been produced by machining.
  • the lip seal in the version (4) is cut without cutting so that the excavated chip is bent away from the groove produced, thus forming an elastic bead.
  • the lip seal with inclined bottom (5) which is also produced without cutting, is basically similar, only points the bent chip, which becomes thinner towards the tip, has a higher elasticity.
  • Rectangular grooves (6) in which part of the groove surface has been cut out to expose the lip, have a particularly flexible lip, which consists of a bent-over residual chip.
  • a bead-shaped lip seal (7) was made on the surface of the sleeve by rolling.
  • Lip seals (8) which have already been molded in the injection molding process during the manufacture of the protective tube (1), make a recess in the sleeve wall and thus a weakening of the sleeve body superfluous.
  • the tool effort as already mentioned, is considerably higher.
  • the lips can be different in the direction of the seal, this naturally also applies to those produced by mechanical processing. It is readily possible to vary the number of lips and the distance from one another in any production method and to adapt them to the requirements.

Abstract

On the outside, the tube protected insert (1) has annular lip seals (2), which owing to multiple repetition act as a labyrinth seal and prevent liquid from penetrating into the gap between insert (1) and tube. These lip seals (2) can be produced by deformation from the insert wall with or without cutting, or they can be formed simultaneously with the insert (1) during production of the inserts, for example using an injection-moulding process. <IMAGE>

Description

Die Erfindung betrifft eine Rohrschutzhülse aus einem thermoplastischem Kunststoff, vorzugsweise Polyamid, mit einem Kragen an einem Ende zum Einschieben in Wörmetauscherrohre.The invention relates to a protective tube made of a thermoplastic, preferably polyamide, with a collar at one end for insertion into word exchange tubes.

Diese Rohrschutz-Hülsen werden vornehmlich an Rohrbündel-Wärmetauschern zur Verhütung der Korrosion eingesetzt, wie sie für viele Zwecke in der Verfahrenstechnik üblich sind. Aus Herstellungsgründen werden die Wärmetauscher-Rohre an den Kopfenden in engem Abstand in Lochplatten eingeschweißt oder eingebördelt. Die Übergänge zwischen dem Wärmetauscher-Rohr und der Lochplatte bzw. die Anfangsteile der Wärmetauscher-Rohre unterliegen einer Erosions-Korrosion durch die Flüssigkeitsströmung und oft auch einer Kontakt-Korrosion durch die Veränderung des Gefüges bei der Einschweißung bzw. durch Elementbildung, falls unterschiedliche Werkstoffe für Rohre und Lochplatten verwendet werden.These tube protection sleeves are primarily used on tube bundle heat exchangers to prevent corrosion, as are common for many purposes in process engineering. For manufacturing reasons, the heat exchanger tubes are welded or crimped at a short distance into perforated plates at the head ends. The transitions between the heat exchanger tube and the perforated plate or the initial parts of the heat exchanger tubes are subject to erosion corrosion by the liquid flow and often also contact corrosion by changing the structure during welding or by element formation, if different materials for Pipes and perforated plates can be used.

Aus der DE-OS 2 600 235 und der GB-PS 1 247 429 ist es bereits bekannt, die Metallrohrenden durch Einsetzen geeigneter Rohrschutz- hülsen aus Kunststoff zu schützen. - Aus der DE-GM 7 728 357 ist weiterhin bereits eine Rohrschutzhülse bekannt, die durch die Ausbildung ihres gleichmäßigen kristallinen Gefüges des verwandten Kunststoffes eine solche Wasseraufnahmefähigkeit besitzt, daß sich die Hülse nach Quellung durch Wasseraufnahme eng an die Innenfläche der Metallrohre anlegt. Außerdem wird die Verbindung zwischen Hülse und Rohrwandung bzw. Lochplatte durch Einbringen eines Klebstoffes weiter verbessert. Die Hülse nach dem genannten GM besitzt an ihrer Außenseite, an dem Ende, an dem die Hülse kragenartig über das Metallrohr greift, eine Aussparung, in der beim Einschieben der mit Klebstoff bestrichenen Kunststoffhülse in das Metallrohr .die überschüssige Klebstoffmenge aufgenommen werden kann.From DE-OS 2 600 235 and GB-PS 1 247 429 it is already known to protect the metal pipe ends by inserting suitable plastic pipe sleeves. - From DE-GM 7 728 357 a tube protective sleeve is also already known, which has such a water absorption capacity due to the formation of its uniform crystalline structure of the related plastic that the sleeve lies tightly against the inner surface of the metal tubes after swelling by water absorption. In addition, the connection between the sleeve and the tube wall or perforated plate is further improved by introducing an adhesive. The sleeve according to the above-mentioned GM has on its outside, at the end at which the sleeve extends like a collar over the metal tube, a recess in which the excess amount of adhesive can be absorbed when the plastic sleeve coated with adhesive is inserted into the metal tube.

Die Klebstoff Verbindung zwischen Hülse und Rohrwandung bzw. Lochplatte, die gewährleisten soll, daß zwischen Hülse und Metall kein korrosives Medium eindringt, erfordert jedoch einen erheblichen Arbeitsaufwand beim Einkleben. Es ist erforderlich, daß der zähflüssige Klebstoff gleichmäßig in dünner Schicht auf die Außenseite der Hülse aufgebracht und die Hülse sorgfältig in das Rohr eingeschoben wird. Außerdem kann in den meisten Fällen nur mit einem Zwei-Komponenten-Kleber gearbeitet werden, ein Umstand, der insbesondere bei der nachträglichen Ausstattung von Wärmetauschern mit Rohrschutzhülsen umständliche Vorarbeiten und hohen Arbeitsaufwand erfordert.However, the adhesive connection between the sleeve and the tube wall or perforated plate, which is intended to ensure that no corrosive medium penetrates between the sleeve and the metal, requires a considerable amount of work when gluing. It is necessary that the viscous adhesive is applied evenly in a thin layer on the outside of the sleeve and the sleeve is carefully inserted into the tube. In addition, in most cases it is only possible to work with a two-component adhesive, a fact that, particularly when retrofitting heat exchangers with protective sleeves, requires laborious preparatory work and a lot of work.

Die Aufgabe der Erfindung liegt darin, die Außenseite der Hülse so auszubilden, daß keine Flüssigkeit zwischen Hülse und Metallwand eindringen kann und gleichzeitig kein Klebstoff für die Ver- bindung benötigt wird.The object of the invention is to design the outside of the sleeve so that no liquid can penetrate between the sleeve and the metal wall and at the same time no adhesive for the binding is needed.

Diese Aufgabe wird dadurch gelöst, daß die Rohrschutzhülse auf ihrer Außenseite mit ringförmigen Lippendichtungen versehen ist.This object is achieved in that the tube protective sleeve is provided on the outside with annular lip seals.

Die ringförmigen Lippendichtungen können aus dem gleichen Kunststoff wie die Schutzhülse bestehen. Durch mehrfache Wiederholung dieser.Lippendichtung entsteht eine Art Labyrinth-Dichtung, die mit Sicherheit das Eindringen von Flüssigkeiten in den Zwischenraum verhindert. Die Wirkung der Lippendichtung kann gleichzeitig durch das bekannte Quellverhalten der eingeschobenen Kunststoffhülse verbessert werden.The ring-shaped lip seals can be made of the same plastic as the protective sleeve. By repeating this lip seal several times, a kind of labyrinth seal is created, which certainly prevents liquids from penetrating into the gap. The effect of the lip seal can be improved at the same time by the known swelling behavior of the inserted plastic sleeve.

Die Kunststoffhülsen werden aus wirtschaftlichen Gründen zumeist im Spritzgußverfahren hergestellt. Die aus dem gleichen Kunststoff-Material bestehenden Lippendichtungen können nachträglich auf der äußeren Oberfläche der Hülse mechanisch geformt werden oder sie werden sofort bei der Herstellung durch entsprechend ausgebildete Spritzgußwerkzeuge erzeugt.For economic reasons, the plastic sleeves are usually manufactured using the injection molding process. The lip seals, which are made of the same plastic material, can subsequently be mechanically formed on the outer surface of the sleeve or they are produced immediately during production by appropriately trained injection molding tools.

Bei der mechanischen Formung können die Lippendichtungen beispielsweise durch spanloses- oder spanendes Stechen auf der Kunststoffoberfläche erzeugt werden oder sie können durch mechanisches Drücken auf der Oberfläche angerollt werden. Diese Vorgänge erfordern zwar einen zusätzlichen Arbeitsgang, jedoch kein kompliziertes Spritzgußwerkzeug. Wenn die Lippendichtung sofort beim Spritzgießen auf der Oberfläche hergestellt werden soll, ist ein Backenwerkzeug, das einen höheren Aufwand bedingt, erforderlich.In the case of mechanical shaping, the lip seals can be produced on the plastic surface, for example by non-cutting or cutting, or they can be rolled on the surface by mechanical pressing. Although these operations require an additional operation, they do not require a complicated injection molding tool. If the lip seal is to be produced on the surface immediately during injection molding, a baking tool is required, which requires more effort.

Ausführungsbeispiele der Erfindung sind in den Abbildungen 1-3 dargestellt und werden im folgenden näher beschrieben. Es zeigen:

  • Fig. 1 Eine Rohrschutzhülse, deren unterer Teil im Schnitt dargestellt ist.
  • Fig. 2 , Einen vergrößerten Schnitt der Hülsenwandung mit verschiedenen Ausführungen einer Lippendichtung.
  • Fig. 3 Zwei weitere Ausführungen einer Lippendichtung Die Abb. 1 zeigt eine Rohrschutzhülse in ihrer gesamten Länge; die Hülse ist im unteren Teil im Schnitt dargestellt. Die Rohrschutzhulse (1) weist auf ihrer dem Metallrohr zugewandten Außenseite in der Regel mehrere, zweckmäßig in Gruppen angeordnete Lippendichtungen (2) auf. In der vorliegenden Abbildung sind es 4 Gruppen zu je 3 Lippendichtungen (2), wodurch jeweils eine Art Labyrinth-Dichtung erzielt wird. Die Lippen können in ihrer Dichtrichtung unterschiedlich und in ihrer Anzahl beliebig oft aufgebracht werden. An der der Lochplatte zugewandten Seite besitzt die Rohrschutzhülse (1) einen angeformten Kragen (3), der elastisch verformbar sein kann, und die Rohrschutzhülse (1) gegen die Flüssigkeitsverteilerseite hin bereits grob abdichtet.
Embodiments of the invention are shown in Figures 1-3 and are described in more detail below. Show it:
  • Fig. 1 A pipe protection sleeve, the lower part of which is shown in section.
  • Fig. 2, an enlarged section of the sleeve wall with different versions of a lip seal.
  • Fig. 3 Two further versions of a lip seal. Fig. 1 shows a tube protection sleeve in its entire length; the sleeve is shown in section in the lower part. The tube protection sleeve (1) generally has a plurality of lip seals (2), which are expediently arranged in groups, on their outside facing the metal tube. In the present illustration there are 4 groups with 3 lip seals each (2), whereby a kind of labyrinth seal is achieved. The lips can be applied differently in their sealing direction and in their number as often as desired. On the side facing the perforated plate, the tube protection sleeve (1) has an integrally formed collar (3) which can be elastically deformable and which already roughly seals the tube protection sleeve (1) against the liquid distributor side.

Die Abb. 2 zeigt einen vergrößerten Schnitt der Wandung der Rohrschutzhülse, wobei die hier dargestellten Dichtlippen spanend erzeugt worden sind. Die Lippendichtung in der Ausführung (4) ist spanlos so gestochen, daß der ausgehobene Span von der erzeugten Nute hin abgewandt umgebogen ist, und so einen elastischen Wulst bildet. Die ebenfalls spanlos hergestellte Lippendichtung mit schrägem Boden (5) ist im Prinzip ähnlich ausgebildet, nur weist der nach der Spitze hin dünner werdende abgebogene Span eine höhere Elastizität auf. Rechteckige Nuten (6), bei denen zur Freilegung der Lippe ein Teil der Nutenfläche herausgespant worden ist, weisen eine besonders nachgiebige Lippe auf, die aus einem umgebogenen Restspan besteht.Fig. 2 shows an enlarged section of the wall of the tube protective sleeve, the sealing lips shown here have been produced by machining. The lip seal in the version (4) is cut without cutting so that the excavated chip is bent away from the groove produced, thus forming an elastic bead. The lip seal with inclined bottom (5), which is also produced without cutting, is basically similar, only points the bent chip, which becomes thinner towards the tip, has a higher elasticity. Rectangular grooves (6), in which part of the groove surface has been cut out to expose the lip, have a particularly flexible lip, which consists of a bent-over residual chip.

In der Abb. 3 wurde eine wulstförmige Lippendichtung (7) auf der Oberfläche der Hülse durch Anrollen hergestellt.In Fig. 3, a bead-shaped lip seal (7) was made on the surface of the sleeve by rolling.

Lippendichtungen (8), die bereits bei der Herstellung der Rohrschutzhülse (1) im Spritzgußverfahren mit ausgeformt worden sind, machen eine Vertiefung in der Hülsenwandung und damit eine Schwächung des Hülsenkörpers überflüssig. Jedoch ist der Werkzeugaufwand, wie schon ausgeführt, erheblich höher. Wie bei der Lippendichtung (8) zu sehen ist, können die Lippen in der Dichtrichtung unterschiedlich sein, das gilt selbstverständlich auch für die durch mechanische Bearbeitung erzeugten. Es ist ohne weiteres möglich, bei jeder Herstellungsweise die Anzahl der Lippen und den Abstand zueinander beliebig zu variieren und den Erfordernissen anzupassen.Lip seals (8), which have already been molded in the injection molding process during the manufacture of the protective tube (1), make a recess in the sleeve wall and thus a weakening of the sleeve body superfluous. However, the tool effort, as already mentioned, is considerably higher. As can be seen with the lip seal (8), the lips can be different in the direction of the seal, this naturally also applies to those produced by mechanical processing. It is readily possible to vary the number of lips and the distance from one another in any production method and to adapt them to the requirements.

Claims (8)

1. Rohrschutzhülse aus einem thermoplastischen Kunststoff, vorzugsweise Polyamid, mit einem Kragen an einem Ende zum Einschieben in Wärmetauscherrohre, dadurch gekennzeichnet, daß die Rohrschutzhülse (1) auf ihrer Außenseite zur Abdichtung mit ringförmigen Lippendichtungen (2, 4, 5,6, 7, 8 ) versehen ist.1. Pipe protection sleeve made of a thermoplastic, preferably polyamide, with a collar at one end for insertion into heat exchanger tubes, characterized in that the tube protection sleeve (1) on its outside for sealing with annular lip seals (2, 4, 5,6, 7, 8) is provided. 2. Rohrschutzhülse nach Anspruch 1 dadurch gekennzeichnet, daß die ringförmigen Lippendichtungen ( 2, 4, 5, 6, 7, 8 ) aus dem gleichen Kunststoff wie die Rohrschutzhülse (1) bestehen und aus dem Hülsenmaterial herausgearbeitet worden sind.2. Pipe protection sleeve according to claim 1, characterized in that the annular lip seals (2, 4, 5, 6, 7, 8) consist of the same plastic as the pipe protection sleeve (1) and have been worked out from the sleeve material. 3. Rohrschutzhülse nach Anspruch 1 und 2 dadurch gekennzeichnet, daß die ringförmigen Lippendichtungen (4, 5, 6 ) durch spanloses Einstechen auf einer Drehmaschine aus dem Hülsenmaterial geformt worden sind.3. Pipe protection sleeve according to claim 1 and 2, characterized in that the annular lip seals (4, 5, 6) have been formed by cutting without cutting on a lathe from the sleeve material. 4. Rohrschutzhülsen nach Anspruch 1 und 2 dadurch gekennzeichnet, daß die ringförmigen Lippendichtungen (6) durch gleichzeitiges spanloses und spanendes Einstechen aus der Hülsenwandung geformt worden sind.4. Pipe protection sleeves according to claim 1 and 2, characterized in that the annular lip seals (6) have been formed by simultaneous non-cutting and cutting piercing from the sleeve wall. 5. Rohrschutzhülse nach Anspruch 1 und 2 dadurch gekennzeichnet, daß die ringförmigen Lippendichtungen (7) durch Anrollen aus der Hülsenwandung herausgeformt worden sind.5. Pipe protective sleeve according to claim 1 and 2, characterized in that the annular lip seals (7) have been formed by rolling out of the sleeve wall. 6. Rohrschutzhülse nach Anspruch 1 dadurch gekennzeichnet, daß die ringförmigen Lippendichtungen (8) bei der Herstellung der Hülse im Spritzgußverfahren gleichzeitig mit der Hülse ausgeformt wurden.6. Pipe protective sleeve according to claim 1, characterized in that the annular lip seals (8) were molded simultaneously with the sleeve in the manufacture of the sleeve by injection molding. 7. Rohrschutzhülse nach Anspruch 1 - 6 dadurch gekennzeichnet, daß die Lippendichtungen auf der Oberfläche der Hülse in Gruppen angeordnet sind, wobei der Abstand zwischen den Dichtringen untereinander und den Dichtringgruppen frei wählbar ist.7. Pipe protective sleeve according to claims 1-6, characterized in that the lip seals are arranged on the surface of the sleeve in groups, the distance between the sealing rings among one another and the sealing ring groups is freely selectable. 8. Rohrschutzhülse nach einem der vorherigen Ansprüche dadurch gekennzeichnet, daß die Schrägstellung der Lippendichtringe zur Achse der Rohrschutzhülse frei wählbar ist.8. Pipe protection sleeve according to one of the preceding claims, characterized in that the inclination of the lip sealing rings to the axis of the pipe protection sleeve is freely selectable.
EP81103766A 1980-06-20 1981-05-16 Plastic tube protective insert for a heat exchanger Withdrawn EP0042491A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803022988 DE3022988C2 (en) 1980-06-20 1980-06-20 Plastic pipe lining for a heat exchanger or the like.
DE3022988 1980-06-20

Publications (1)

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EP0042491A1 true EP0042491A1 (en) 1981-12-30

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EP81103766A Withdrawn EP0042491A1 (en) 1980-06-20 1981-05-16 Plastic tube protective insert for a heat exchanger

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EP (1) EP0042491A1 (en)
DE (1) DE3022988C2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0217189B1 (en) * 1985-09-17 1989-12-27 Insituform Group Limited lining and method of a lining pipe
WO2006121400A1 (en) * 2005-05-10 2006-11-16 Metso Power Ab Insert tube and a system of insert tubes
US7234571B2 (en) 2000-03-16 2007-06-26 Honeywell International Inc. Fiber reinforced composite parts

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2977993A (en) * 1957-11-27 1961-04-04 Texas Pipe Line Company Non-metallic pipe end closure
US3485271A (en) * 1966-09-30 1969-12-23 Mccreary Tire & Rubber Co Protector for casings,pipes and other cylindrical objects
CH508828A (en) * 1970-07-08 1971-06-15 Hirmann Georg Method for closing bores in workpieces and plugs for carrying out the method
GB1247429A (en) * 1969-12-23 1971-09-22 Alan Banner Improvements in or relating to protective inserts for condenser tubes
DE2600235A1 (en) * 1975-12-08 1977-06-16 Bbc Brown Boveri & Cie Preventing and repairing damage to ends of heat exchanger tubes - by inserting and glueing polyamide bushings fitted with collar
DE7728357U1 (en) * 1978-10-12 Pampus Kg, 4156 Willich Lined pipe for a heat exchanger or the like

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7728357U1 (en) * 1978-10-12 Pampus Kg, 4156 Willich Lined pipe for a heat exchanger or the like
US2977993A (en) * 1957-11-27 1961-04-04 Texas Pipe Line Company Non-metallic pipe end closure
US3485271A (en) * 1966-09-30 1969-12-23 Mccreary Tire & Rubber Co Protector for casings,pipes and other cylindrical objects
GB1247429A (en) * 1969-12-23 1971-09-22 Alan Banner Improvements in or relating to protective inserts for condenser tubes
CH508828A (en) * 1970-07-08 1971-06-15 Hirmann Georg Method for closing bores in workpieces and plugs for carrying out the method
DE2600235A1 (en) * 1975-12-08 1977-06-16 Bbc Brown Boveri & Cie Preventing and repairing damage to ends of heat exchanger tubes - by inserting and glueing polyamide bushings fitted with collar

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0217189B1 (en) * 1985-09-17 1989-12-27 Insituform Group Limited lining and method of a lining pipe
US7234571B2 (en) 2000-03-16 2007-06-26 Honeywell International Inc. Fiber reinforced composite parts
WO2006121400A1 (en) * 2005-05-10 2006-11-16 Metso Power Ab Insert tube and a system of insert tubes

Also Published As

Publication number Publication date
DE3022988A1 (en) 1982-01-14
DE3022988C2 (en) 1982-08-19

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