EP0326867B2 - 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
EP0326867B2
EP0326867B2 EP89100917A EP89100917A EP0326867B2 EP 0326867 B2 EP0326867 B2 EP 0326867B2 EP 89100917 A EP89100917 A EP 89100917A EP 89100917 A EP89100917 A EP 89100917A EP 0326867 B2 EP0326867 B2 EP 0326867B2
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EP
European Patent Office
Prior art keywords
pipes
water
cleaning
plastics material
pipe systems
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Expired - Lifetime
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EP89100917A
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German (de)
French (fr)
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EP0326867A2 (en
EP0326867A3 (en
EP0326867B1 (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 renovation by means of cleaning and coating of pipelines intended for water management.
  • the chemical composition of the drinking water flowing in metallic pipes and equipment has an influence on the corrosion and / or the formation of stones on the pipe walls.
  • Very soft to soft water attacks metal 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 an advertising-improved method for renovation by means of cleaning and coating of pipelines intended for water guidance, with which it is possible to renovate existing pipelines, in particular smaller dimensions that these pipes can continue to be used afterwards.
  • the pipes are closed at individual points with ventilation plugs before the pipes are coated and, after filling, vented at these points by means of the liquid plastic.
  • the filled-in liquid plastic advantageously remains in the pipeline for about an hour at about 6 atm pressure.
  • 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.
  • an existing pipe a 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 method according to the invention is for cold water pipes, hot water pipes and heating lines are provided. It is possible to renovate both copper piping and galvanized steel piping. Dismantling and relocating the pipelines in apartment blocks would be very expensive and costly. In addition, various handicrafts (tilers, painters, bricklayers, decorators) would still have to be carried out.
  • 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.
  • rough cleaning is first carried out using water and compressed air. 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. drain off.
  • an acid corresponding to the pipeline material, for example hydrochloric acid
  • 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 pipeline network for a correspondingly long time depending on the degree of contamination.
  • lime and rust must also be dissolved.
  • 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 discharged.
  • 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.

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 Sanierung mittels Reinigung und Beschichtung von zur Wasserführung bestimmten Rohrleitungen.The invention relates to a method for renovation by means of cleaning and coating of pipelines intended for water management.

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 builds up 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 equipment has an influence on the corrosion and / or the formation of stones on the pipe walls. Very soft to soft water attacks metal 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.In 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, and even a slight increase in temperature accelerates the precipitation of carbonate, so that an oxygen attack cannot generally take place. 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. In the water system of a heating system, for example, 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 the 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 amount. 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 werbessertes Verfahren zur Sanierung mittels 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 an advertising-improved method for renovation by means of cleaning and coating of pipelines intended for water guidance, with which it is possible to renovate existing pipelines, in particular smaller dimensions that these pipes can continue to be used afterwards.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein Verfahren mit den in Patentanspruch 1 angegebenen Merkmalen vorgeschlagen wird.This object is achieved in that a method with the features specified in claim 1 is proposed.

Bei der Grobreinigung wird daher ein 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.During rough cleaning, a compressed air / water mixture is therefore pressed into the pipes. This process is carried out until the first coarse dirt, contaminants, rust particles, etc. flow away. At various points, flexible drain hoses are attached that lead into a collecting container.

Gemäß einer weiteren besonders bevorzugten Ausführungsform werden vor der Beschichtung der Rohrleitungen 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 pipes are closed at individual points with ventilation plugs before the pipes are coated and, after filling, vented at these points by means of the liquid plastic.

Vorteilhafterweise verbleibt der eingefüllte flüssige Kunststoff unter etwa 6 atü Druck etwa eine Stunde lang in der Rohrleitung.The filled-in liquid plastic advantageously remains in the pipeline for about an hour at about 6 atm pressure.

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.

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 eine vorhandene Rohrleitung, eine 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.Conventionally, an existing pipe, a 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 is for cold water pipes, hot water pipes and heating lines are provided. It is possible to renovate both copper piping and galvanized steel piping. Dismantling and relocating the pipelines in apartment blocks would be very expensive and costly. In addition, various handicrafts (tilers, painters, bricklayers, decorators) 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 eine Grobreinigung mittels Wasser und Preßluft. An einem Anschluß wird ein Preßluft- 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, rough cleaning is first carried out using water and compressed air. 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. drain off.

Anschließend an diese Grobreinigung wird eine Feinreinigung (Beizen) durchgeführt. Hierzu wird nunmehr vorzugsweise an derselben Stelle, an der vorher das Preßluft- Wassergemisch zugeführt wurde, eine Säure (entsprechend dem Rohrleitungswerkstoff zum Beispiel Salzsäure) unter Druck eingefüllt und verbleibt im Rohrleitungsnetz je nach Verschmutzungsgrad entsprechend lange. Hierbei muß auch Kalk und Rost aufgelöst werden 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 pipeline 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 pipeline network for a correspondingly long time depending on the degree of contamination. Here, lime and rust must also be dissolved. 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 discharged.

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, werden sie mit Kunststoff beschichtet.Now that the pipes have been cleaned as optimally as possible, they are coated with plastic.

Hierzu wird zuerst die Rohrleitung an verschiedenen Punkten mit einem Lüftungsstopfen verschlossen. An dem bisherigen Einführungspunkt wird eine Druckkesselanlage angeschlossen. Mit derem Hilfe wird der flüssige Kunststoff in die Rohrleitung 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 poren- und rißfrei sein,
  • 4. sie muß temperaturbeständig sein,
  • 5. sie muß abrieblest 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 this help, the liquid plastic is pressed into the pipeline. 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 free of pores and cracks,
  • 4. it must be temperature-resistant,
  • 5. It must be resistant to abrasion against water flow be.

Während des Füllens der Rohrleitung muß diese mittels den Lüftungsstopfen entlüftet werden. Nachdem nunmehr die Rohrleitung unter Druck gesetzt wurde, (ungefähr 1,0 Stunden mit 6 atü) wird das überschüssige, nicht an den Wandungen haftende Kunststoffmaterial abgelassen.While filling the pipeline, it must be vented using the ventilation plug. Now that the pipeline has been pressurized (approximately 1.0 hour at 6 atm), the excess plastic material not adhering to the walls is drained off.

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 lines are filled and the sanitary fittings and devices are assembled in a known manner.

Claims (4)

  1. A method of restoring pipes intended for carrying water by means of cleaning and coating, having the following steps:
    (a) emptying the pipes of water;
    (b) taking apart sanitary fittings and installations, as well as bridging over openings occurring;
    (c) firstly, coarse cleaning of the pipes by means of water and pressurised air;
    (d) then, fine cleaning of the pipes by introducing acid under pressure and by allowing the acid to act, the acid then being drained off;
    (e) drying the pipes with pressurised air;
    (f) filling the pipes with liquid plastics material under pressure; and
    (g) draining off excess plastics material from the pipes.
  2. A method according to Claim 1,
    characterised in that
    prior to the operation of coating the pipes in accordance with method step (f), the pipes are closed at individual points with venting plugs, and, after filling with liquid plastics material, venting is effected at those points.
  3. A method according to at least one of the preceding Claims,
    characterised in that
    the plastics material which is introduced in accordance with method step (f) remains in the pipes under a pressure of about 6 atmospheres excess pressure for about one hour.
  4. A method according to at least one of the preceding claims,
    characterised in that
    subsequently to method step (g) the excess plastics material not sticking to the walls of the pipes is blown from 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
DE3803410A DE3803410A1 (en) 1988-02-05 1988-02-05 METHOD FOR CLEANING AND COATING PIPELINES DETERMINED FOR WATERING
DE3803410 1988-02-05

Publications (4)

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

Family

ID=6346671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89100917A Expired - Lifetime EP0326867B2 (en) 1988-02-05 1989-01-20 Method for cleaning and coating pipe systems for water transport

Country Status (7)

Country Link
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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Also Published As

Publication number Publication date
JPH01231972A (en) 1989-09-18
ATE82709T1 (en) 1992-12-15
EP0326867A2 (en) 1989-08-09
ES2036724T5 (en) 1997-06-01
DE58902786D1 (en) 1993-01-07
GR3023475T3 (en) 1997-08-29
EP0326867A3 (en) 1990-11-07
DE3803410A1 (en) 1989-08-17
US5045352A (en) 1991-09-03
ES2036724T3 (en) 1993-06-01
GR3007021T3 (en) 1993-07-30
EP0326867B1 (en) 1992-11-25

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