EP0326867B1 - Method for cleaning and coating pipe systems for water transport - Google Patents

Method for cleaning and coating pipe systems for water transport Download PDF

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Publication number
EP0326867B1
EP0326867B1 EP89100917A EP89100917A EP0326867B1 EP 0326867 B1 EP0326867 B1 EP 0326867B1 EP 89100917 A EP89100917 A EP 89100917A EP 89100917 A EP89100917 A EP 89100917A EP 0326867 B1 EP0326867 B1 EP 0326867B1
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EP
European Patent Office
Prior art keywords
pipes
cleaning
water
coating
intended
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EP89100917A
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German (de)
French (fr)
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EP0326867B2 (en
EP0326867A3 (en
EP0326867A2 (en
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Karl Müller
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
    • E03C1/30—Devices to facilitate removing of obstructions in waste-pipes or sinks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
    • B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
    • B08B9/0326—Using pulsations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
    • B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
    • B08B9/0328—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid by purging the pipe with a gas or a mixture of gas and liquid

Definitions

  • the invention relates to a method for cleaning and coating pipelines intended for water guidance.
  • the chemical composition of the drinking water flowing in metallic pipes and devices has an influence on the corrosion and / or the formation of stones on the pipe walls.
  • Very soft to soft water attacks metallic materials almost unhindered without any noticeable formation of protective or cover layers.
  • the metal dissolution usually takes place over the entire water-wetted surface, with corrosion products being carried along by the water.
  • the object on which the present invention is based is to propose a method for cleaning and coating pipelines intended for water management, with which it is possible to renovate existing pipelines, in particular smaller dimensions, so that these pipelines can then continue to be used.
  • the pipelines are closed at individual points with ventilation plugs before coating the pipelines in accordance with method step d) and, after filling, vented at these points by means of the liquid plastic.
  • the liquid plastic filled in according to method step d) remains in the line under about 6 atm pressure for about an hour.
  • the excess plastic material which does not adhere to the walls of the pipelines is blown out from all high points by means of compressed air.
  • the existing water pipe is installed in the wall. It consists of various materials, in particular galvanized threaded pipe according to DIN.
  • the cause or reason for the renovation is usually the constant pitting and rust in the water described above.
  • the water is turned off and the pipes to be renovated are emptied.
  • the existing sanitary fittings and devices are dismantled and the openings created are bridged.
  • the various cleaning steps serve to achieve a surface that is as bright as possible metallic, d. H. to remove all incrustations, rust spots, lime residues.
  • a rough cleaning using water and compressed air takes place first in accordance with method step a).
  • a compressed air / water mixture is pressed into the pipes.
  • flexible drain hoses are attached that lead into a collecting container. This process is carried out until the first coarse dirt, impurities, rust particles, etc. flow away.
  • an acid corresponding to the pipe material, for example hydrochloric acid
  • an acid is now preferably filled in under pressure at the same point at which the compressed air / water mixture was previously supplied and remains in the pipe network for a correspondingly long time depending on the degree of contamination.
  • Lime and rust must also be dissolved here (procedural document b).
  • This acid can also be filled in hot, for example. It has also proven to be advantageous to use an inhibitor in this acid which is intended to prevent the pipes from rusting immediately after the acid has been drained off.
  • the pipe is coated with plastic.
  • the excess plastic material not adhering to the walls of the pipelines is then blown out from all high points by means of compressed air.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cleaning In General (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention relates to a method for cleaning and coating pipe systems intended for carrying water, in which     a) water and compressed air are forced into the emptied pipe systems for coarse cleaning,     b) an acid which remains for some time in the pipe system is subsequently filled in under pressure,     c) the pipe systems cleaned in this way are dried by means of compressed air,     d) in order to coat the pipe systems a liquid plastic is filled in under pressure and     e) excess plastic material is let out.

Description

Die Erfindung betrifft ein Verfahren zur Reinigung und Beschichtung von zur Waaserführung bestimmten Rohrleitungen.The invention relates to a method for cleaning and coating pipelines intended for water guidance.

Bei wasserführenden Leitungen ist es bekannt, daß sich an den Leitungswänden mit den Jahren Rost absetzt, der dann zu dem unerwünschten Rost im Wasser an den Wasserentnahmestellen führt.With water-carrying pipes, it is known that rust settles on the pipe walls over the years, which then leads to the undesirable rust in the water at the water tapping points.

Die chemische Zusammensetzung des in metallischen Rohrleitungen und Geräten fließenden Trinkwassers hat einen Einfluß auf die Korrosion und/oder die Steinbildung an den Rohrleitungswänden. Sehr weiches bis weiches Wasser greift fast ungehindert ohne merkliche Schutz- oder Deckschichtenbildung metallische Werkstoffe an. Die Metallauflösung vollzieht sich hier meist über die ganze wasserbenetzte Oberfläche, wobei Korrosionsprodukte vom Wasser mitgeführt werden.The chemical composition of the drinking water flowing in metallic pipes and devices has an influence on the corrosion and / or the formation of stones on the pipe walls. Very soft to soft water attacks metallic materials almost unhindered without any noticeable formation of protective or cover layers. The metal dissolution usually takes place over the entire water-wetted surface, with corrosion products being carried along by the water.

Bei mittelhartem Wasser besteht oftmals ein Wechselspiel zwischen Schutz- oder Deckschichtenbildung und Korrosion. Hierdurch entstehen an den wasserberührten Teilen gebundene, pustelförmige Korrosionsprodukte. Diese führen einerseits zu Unterrostungen, andererseits werden sie vom Wasser fortgeschwemmt, schlagen sich auf blanke Metalle nieder und führen dort zu Lochfraß.With medium-hard water, there is often an interplay between the formation of protective or cover layers and corrosion. This results in pustular corrosion products bound to the parts in contact with water. On the one hand, these lead to under-rusting, on the other hand, they are washed away by the water, deposit on bare metals and lead to pitting.

Hartes bis sehr hartes Wasser führt zur Bildung von Stein, wobei schon eine leichte Erhöhung der Temperatur die Ausfällung von Karbonat beschleunigt, so daß in der Regel ein Sauerstoffangriff nicht erfolgen kann. Der Kesselstein wächst ständig weiter und führt oftmals schon nach kurzer Zeit zu Verstopfungen oder anderen Komplikationen.Hard to very hard water leads to the formation of stone, whereby a slight increase in temperature accelerates the precipitation of carbonate, so that an oxygen attack cannot generally occur. The scale continues to grow and often leads to blockages or other complications after a short time.

Dem Fachmann ist bekannt, daß jede chemische und elektrochemische Reaktion mit zunehmender Temperatur beschleunigt wird. So werden zum Beispiel im Wassersystem einer heizungstechnischen Anlage die Vorgänge der Werkstoffzerstörung oder Steinbildung schon nach relativ kurzer Zeit sichtbar, im Gegenteil zum Kaltwassertrakt. Dies trifft auch auf Haushaltsgeräte zu.It is known to the person skilled in the art that every chemical and electrochemical reaction is accelerated with increasing temperature. For example, in the water system of a heating system, the processes of material destruction or stone formation become visible after a relatively short time, in contrast to the cold water tract. This also applies to household appliances.

Aus der europäischen Patentschrift 0 090 384 ist ein Verfahren zur Innenabdichtung insbesondere von Hausgasleitungen bekannt, mit dem es möglich ist, Gasleitungen abzudichten, die gewisse ein vorgegebenes Maß überschreitende Leckmengen aufweisen. Das in dieser Patentschrift beschriebene Verfahren ist lediglich für Gasleitungen anwendbar, jedoch nicht für Rohrleitungen, die Wasser, evtl. auch andere flüssige Medien, führen.From European patent specification 0 090 384 a method for internal sealing, in particular of house gas lines, is known, with which it is possible to seal gas lines which have certain leakage quantities exceeding a predetermined level. The method described in this patent can only be used for gas pipes, but not for pipes which carry water, possibly also other liquid media.

Die der vorliegenden Erfindung zugrunde liegende Aufgabe besteht darin, ein Verfahren zur Reinigung und Beschichtung von zur Wasserführung bestimmten Rohrleitungen vorzuschlagen, mit dem es möglich ist, vorhandene Rohrleitungen, insbesondere kleinere Dimensionen, zu sanieren, so daß diese Rohrleitungen anschließend weiterhin verwendet werden können.The object on which the present invention is based is to propose a method for cleaning and coating pipelines intended for water management, with which it is possible to renovate existing pipelines, in particular smaller dimensions, so that these pipelines can then continue to be used.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein Verfahren zur Reinigung und Beschichtung von zur Wasserführung bestimmten Rohrleitungen vorgeschlagen wird, bei dem

  • a) Wasser und Druckluft in die geleerten Rohrleitungen zur Grobreinigung gepreßt werden,
  • b) anschließend unter Druck eine Säure eingefüllt wird, die einige Zeit in dem Rohrleitungsnetz verbleibt,
  • c) die so gereinigten Rohrleitungen mittels Preßluft getrocknet werden,
  • d) anschließend zur Beschichtung der Rohrleitungen ein flüssiger Kunststoff unter Druck eingefüllt wird und
  • e) überschüssiges Kunststoffmaterial abgelassen wird.
This object is achieved in that a method for cleaning and coating pipes intended for water supply is proposed, in which
  • a) water and compressed air are pressed into the empty pipes for rough cleaning,
  • b) an acid is then filled in under pressure and remains in the pipeline network for some time,
  • c) the pipes cleaned in this way are dried by means of compressed air,
  • d) a liquid plastic is then filled in under pressure to coat the pipelines and
  • e) excess plastic material is drained.

Gemäß einer besonders bevorzugten Ausführungsform wird zur Grobreinigung gemäß Verfahrensschritt a) einAccording to a particularly preferred embodiment, for rough cleaning according to process step a)

Druckluft- Wassergemisch in die Rohrleitungen gepreßt. Dieser Vorgang wird so lange durchgeführt, bis der erste grobe Schmutz, Verunreinigungen, Rostpartikel etc. abfließt. An verschiedenen Punkten werden flexible Ablaufschläuche befestigt, die in einen Auffangbehälter hineinführen.Compressed air / water mixture pressed into the pipes. This process is carried out until the first coarse dirt, impurities, rust particles, etc. flow away. Flexible drain hoses are attached at various points and lead into a collecting container.

Gemäß einer weiteren besonders bevorzugten Ausführungsform werden vor der Beschichtung der Rohrleitungen gemäß Verfahrensschritt d) die Rohrleitungen an einzelnen Punkten mit Lüftungsstopfen verschlossen und nach dem Füllen mittels des flüssigen Kunststoffes an diesen Punkten entlüftet.According to a further particularly preferred embodiment, the pipelines are closed at individual points with ventilation plugs before coating the pipelines in accordance with method step d) and, after filling, vented at these points by means of the liquid plastic.

Vorteilhafterweise verbleibt der gemäß Verfahrensschritt d) eingefüllte flüssige Kunststoff unter etwa 6 atü Druck etwa eine Stunde lang in der Leitung.Advantageously, the liquid plastic filled in according to method step d) remains in the line under about 6 atm pressure for about an hour.

Vorteilhafterweise wird anschließend an den Verfahrensschritt e) das überschüssige, nicht an den Wandungen der Rohrleitungen haftende Kunststoffmaterial mittels Preßluft von sämtlichen Hochpunkten aus ausgeblasen.Advantageously, subsequent to process step e), the excess plastic material which does not adhere to the walls of the pipelines is blown out from all high points by means of compressed air.

Im folgenden wird der Ablauf des in den genannten Ansprüchen dargestellten Verfahrens ausführlich beschrieben.The sequence of the method presented in the cited claims is described in detail below.

Herkömmlicherweise ist die vorhandene Wasserleitung in der Wand verlegt. Sie besteht aus verschiedenem Material, insbesondere aus verzinktem Gewinderohr nach DIN. Ursache oder Grund der Sanierung ist üblicherweise der oben beschriebene ständige Lochfraß und Rost im Wasser.Traditionally, the existing water pipe is installed in the wall. It consists of various materials, in particular galvanized threaded pipe according to DIN. The cause or reason for the renovation is usually the constant pitting and rust in the water described above.

Zur Durchführung des erfindungsgemäßen Verfahrens wird das Wasser abgestellt und die zu sanierenden Rohrleitungen entleert. Die vorhandenen Sanitäramaturen und Geräte werden demontiert und die entstehenden Öffnungen überbrückt.To carry out the method according to the invention, the water is turned off and the pipes to be renovated are emptied. The existing sanitary fittings and devices are dismantled and the openings created are bridged.

Insbesondere ist das erfindungsgemäße Verfahren für Kaltwasserleitungen, Warmwasserleitungen und Heizungsleitungen vorgesehen. Es ist sowohl möglich, Kupferrohrleitungen als auch verzinkte Stahlrohrleitungen zu sanieren. Eine Demontage und Neuverlegung der Rohrleitungen bei Wohnblocks wäre mit einem sehr großen Aufwand und Kosten verbunden. Außerdem müßten verschiedene Handwerkerarbeiten (Fliesenleger, Maler, Maurer, Tapezierer) noch durchgeführt werden.In particular, the method according to the invention for cold water pipes, hot water pipes conditions and heating lines provided. It is possible to renovate both copper piping and galvanized steel piping. Dismantling and relocating the pipelines for apartment blocks would be very expensive and costly. In addition, various handicrafts (tilers, painters, bricklayers, upholsterers) would still have to be carried out.

Die verschiedenen Reinigungsschritte dienen dazu, einen möglichst metallischblanken Untergrund zu erreichen, d. h. sämtliche Inkrustationen, Roststellen, Kalkrückstände zu entfernen. Insbesondere erfolgt zuerst gemäß Verfahrensschritt a) eine Grobreinigung mittels Wasser und Druckluft. An einem Anschluß wird ein Druckluft- Wassergemisch in die Rohrleitungen gepreßt. An weiteren Punkten werden flexible Ablaufschläuche befestigt, die in einen Auffangbehälter hineinführen. Dieser Vorgang wird so lange durchgeführt, bis der erste grobe Schmutz, Verunreinigungen, Rostpartikel etc. abfließen.The various cleaning steps serve to achieve a surface that is as bright as possible metallic, d. H. to remove all incrustations, rust spots, lime residues. In particular, a rough cleaning using water and compressed air takes place first in accordance with method step a). At one connection, a compressed air / water mixture is pressed into the pipes. At other points, flexible drain hoses are attached that lead into a collecting container. This process is carried out until the first coarse dirt, impurities, rust particles, etc. flow away.

Anschließend an diese Grobreinigung wird eine Feinreinigung (beizen) durchgeführt. Hierzu wird nunmehr vorzugsweise an derselben Stelle, an der vorher das Druckluft- Wassergemisch zugeführt wurde, eine Säure (entsprechend des Rohrleitungswerkstoffes zum Beispiel Salzsäure) unter Druck eingefüllt und verbleibt im Rohrleitungsnetz je nach Verschmutzungsgrad entsprechend lange. Hierbei muß auch Kalk und Rost aufgelöst werden (Verfahrensschriftt b). Diese Säure kann beispielsweise auch heiß eingefüllt werden. Ferner hat es sich als günstig erwiesen, einen Inhibitor in dieser Säure einzusetzen, der ein Rosten der Rohrleitungen unmittelbar nach dem Ablassen der Säure verhindern soll.After this rough cleaning, a fine cleaning (pickling) is carried out. For this purpose, an acid (corresponding to the pipe material, for example hydrochloric acid) is now preferably filled in under pressure at the same point at which the compressed air / water mixture was previously supplied and remains in the pipe network for a correspondingly long time depending on the degree of contamination. Lime and rust must also be dissolved here (procedural document b). This acid can also be filled in hot, for example. It has also proven to be advantageous to use an inhibitor in this acid which is intended to prevent the pipes from rusting immediately after the acid has been drained off.

Die wie beschrieben gereinigte Leitung wird nunmehr mittels Preßluft, die an der gleichen Stelle wie die bisherigen Flüssigkeiten eingeführt wird, getrocknet.The line cleaned as described is now dried by means of compressed air, which is introduced at the same point as the previous liquids.

Nachdem nunmehr die Rohrleitungen möglichst optimal gereinigt wurden, wird die Leitung mit Kunststoff beschichtet.Now that the pipes have been cleaned as optimally as possible, the pipe is coated with plastic.

Hierzu wird zuerst die Rohrleitung an verschiedenen Punkten mit einem Lüftungsstopfen verschlossen. An dem bisherigen Einführungspunkt wird eine Druckkesselanlage angeschlossen. Mit Hilfe dieser wird der flüssige Kunststoff in die Leitung hineingedrückt. Es entsteht eine vollflächige Beschichtung der Rohrleitungsinnenwand, die folgende Eigenschaften aufweisen muß:

  • 1. Sie muß gegebenenfalls den Trinkwasserbestimmungen entsprechen,
  • 2. sie muß eine glatte, homogene Oberfläche bilden,
  • 3. sie muß porös und rißfrei sein,
  • 4. sie muß temperaturbeständig sein,
  • 5. sie muß abriebfest gegen Wasserströmung sein.
For this purpose, the pipeline is first closed at various points with a ventilation plug. A pressure boiler system will be connected to the previous entry point. With the help of this, the liquid plastic is pressed into the line. A full-surface coating of the inner pipe wall is created, which must have the following properties:
  • 1. If necessary, it must comply with the drinking water regulations,
  • 2. it must form a smooth, homogeneous surface,
  • 3. it must be porous and free of cracks,
  • 4. it must be temperature-resistant,
  • 5. It must be resistant to water flow.

Während des Füllens der Leitung muß mittels den Lüftungsstopfen die Leitung entlüftet werden. Nachdem nunmehr die Leitung unter Druck gesetzt wurde, (ungefähr 1,0 Stunden mit 6 atü) wird das überschüssige, nicht an den Wandungen haftende Kunststoffmaterial abgelassen (Verfahrensschriftt e).When filling the line, the line must be vented using the ventilation plugs. Now that the line has been pressurized (approximately 1.0 hours at 6 atm), the excess plastic material which is not adhering to the walls is drained off (procedural document e).

Vorteilhafterweise wird anschließend das überschüssige, nicht an den Wandungen der Rohrleitungen haftende Kunststoffmaterial mittels Preßluft von sämtlichen Hochpunkten aus ausgeblasen.Advantageously, the excess plastic material not adhering to the walls of the pipelines is then blown out from all high points by means of compressed air.

Nach der Durchführung dieser verschiedenen nunmehr beschriebenen Verfahrensschritte ist ein Rohrleitungssystem entstanden, dessen Innenwand beschichtet ist und nunmehr wieder zur Führung von Wasser benutzt werden kann. Die Füllung der Leitungen und die Montage der Sanitäramaturen und Geräte erfolgt auf bekannte Weise.After the implementation of these various process steps, which have now been described, a pipeline system has been created, the inner wall of which is coated and can now be used again for carrying water. The filling of the lines and the assembly of the sanitary fittings and devices is carried out in a known manner.

Claims (5)

1. A method of cleaning and coating pipes which are intended for carrying water, which is characterised by the combination of the following features:
a) water and compressed air are forced into the emptied pipes for coarse cleaning,
b) an acid is then introduced under pressure, which remains in the pipe system for some time,
c) the pipes which are cleaned in that way are dried by means of pressurised air,
d) a liquid plastics material is introduced under pressure for coating the pipes, and
e) excessive plastics material is drained off.
2. A method of cleaning and coating pipes which are intended for carrying water, according to claim 1, characterised in that a compressed air-water mixture is forced into the pipes for the coarse cleaning operation in accordance with method step a).
3. A method of cleaning and coating pipes which are intended for carrying water, according to claim 1 or claim 2 characterised in that, prior to the operation of coating the pipes in accordance with method step d), the pipes are closed at individual points with venting plugs and, after the operation of filling the pipe system by means of the liquid plastics material, venting of the air is effected at those points.
4. A method of cleaning and coating pipes which are intended for carrying water, according to at least one of the preceding claims, characterised in that the plastics material which is introduced in accordance with method step d) remains in the pipe under a pressure of about 6 atmospheres excess pressure for about one hour.
5. A method of cleaning and coating pipes wich are intended for carrying water, according to at least one of the preceding claims, characterised in that subsequently to method step e) the excessive plastics material which does not adhere to the walls of the pipes is blown out of all high points by means of pressurised air.
EP89100917A 1988-02-05 1989-01-20 Method for cleaning and coating pipe systems for water transport Expired - Lifetime EP0326867B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89100917T ATE82709T1 (en) 1988-02-05 1989-01-20 PROCESSES FOR CLEANING AND COATING PIPELINES DEDICATED TO WATER SUPPLY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3803410 1988-02-05
DE3803410A DE3803410A1 (en) 1988-02-05 1988-02-05 METHOD FOR CLEANING AND COATING PIPELINES DETERMINED FOR WATERING

Publications (4)

Publication Number Publication Date
EP0326867A2 EP0326867A2 (en) 1989-08-09
EP0326867A3 EP0326867A3 (en) 1990-11-07
EP0326867B1 true EP0326867B1 (en) 1992-11-25
EP0326867B2 EP0326867B2 (en) 1997-02-26

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EP89100917A Expired - Lifetime EP0326867B2 (en) 1988-02-05 1989-01-20 Method for cleaning and coating pipe systems for water transport

Country Status (7)

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US (1) US5045352A (en)
EP (1) EP0326867B2 (en)
JP (1) JPH01231972A (en)
AT (1) ATE82709T1 (en)
DE (2) DE3803410A1 (en)
ES (1) ES2036724T5 (en)
GR (2) GR3007021T3 (en)

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Publication number Priority date Publication date Assignee Title
DE19513150C1 (en) * 1995-04-07 1996-08-29 Aqua Protect Ges Fuer Wasserle Process for cleaning and coating pipelines or piping systems, in particular for water supply
DE19745642A1 (en) * 1997-10-15 1999-04-22 Michael Schaaf Refurbishment of encrusted pipelines for water supply, e.g. removal of lime scale
DE10323298A1 (en) * 2003-05-21 2004-12-16 Grunwald, Herbert Method for renovation of encrusted water pipes includes application of a heated gas to the pipe interior, and subsequent removal of the dried encrustations by means of high-pressure liquid jets
DE10358253B4 (en) * 2003-12-11 2009-12-31 Aqua-Protect Gmbh Process for the rehabilitation of incrusted water pipes with several pipe sections

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US5499659A (en) * 1990-07-03 1996-03-19 Naf; Werner Process for the sealing and internal repair of systems of laid conduits
US5212000A (en) * 1991-03-11 1993-05-18 The Dow Chemical Company Method for providing an inner-skinned functionalized coating on the lumen-defining surface of a hollow tube
US5527395A (en) * 1991-05-16 1996-06-18 H.E.R.C. Products Incorporated Method of cleaning and maintaining potable water distribution pipe systems with a heated cleaning solution
US5885364A (en) * 1991-05-16 1999-03-23 H.E.R.C. Products Incorporated Method of cleaning and maintaining potable water distribution pipe systems
US5360488A (en) * 1993-03-23 1994-11-01 H.E.R.C. Products Incorporated Method of cleaning and maintaining water distribution pipe systems
US5380564A (en) * 1992-04-28 1995-01-10 Progressive Blasting Systems, Inc. High pressure water jet method of blasting low density metallic surfaces
DE59407036D1 (en) * 1993-07-12 1998-11-12 Promotec Ag Process, composition and device for the internal cleaning and coating of pipelines
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EP0326867B2 (en) 1997-02-26
ES2036724T3 (en) 1993-06-01
GR3007021T3 (en) 1993-07-30
GR3023475T3 (en) 1997-08-29
DE3803410A1 (en) 1989-08-17
JPH01231972A (en) 1989-09-18
DE58902786D1 (en) 1993-01-07
EP0326867A3 (en) 1990-11-07
US5045352A (en) 1991-09-03
ATE82709T1 (en) 1992-12-15
ES2036724T5 (en) 1997-06-01
EP0326867A2 (en) 1989-08-09

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