EP0326867A2 - 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
EP0326867A2
EP0326867A2 EP89100917A EP89100917A EP0326867A2 EP 0326867 A2 EP0326867 A2 EP 0326867A2 EP 89100917 A EP89100917 A EP 89100917A EP 89100917 A EP89100917 A EP 89100917A EP 0326867 A2 EP0326867 A2 EP 0326867A2
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EP
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Prior art keywords
cleaning
water
pipelines
compressed air
pipes
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EP89100917A
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German (de)
French (fr)
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EP0326867B1 (en
EP0326867A3 (en
EP0326867B2 (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

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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 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 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, are deposited 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 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. 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 is intended for cold water pipes, hot water pipes and heating pipes. It is possible to renovate both copper piping and galvanized steel piping. Dismantling and relocating the pipelines in apartment blocks would involve a great deal of effort and cost. In addition, various handicrafts (tilers, painters, bricklayers, wallpaperers) 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 metallic as possible, ie to remove all incrustations, rust spots and 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 continues 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 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 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, 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 ent­ steht 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. It ent there is a full-surface coating of the inner pipe wall, 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. After the line has now been pressurized (approximately 1.0 hour 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.The excess plastic material which does not adhere to the walls of the pipelines is then advantageously 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 (5)

1. Verfahren zur Reinigung und Beschichtung von zur Wasserführung bestimmten Rohrleitungen,
dadurch gekennzeichnet, a) daß Wasser und Druckluft in die geleerten Rohrlei­tungen zur Grobreinigung gepreßt werden, b) daß anschließend unter Druck eine Säure eingefüllt wird, die einige Zeit in dem Rohrleitungsnetz ver­bleibt, c) daß die so gereinigten Rohrleitungen mittels Preß­luft getrocknet werden, d) daß zur Beschichtung der Rohrleitungen ein flüssiger Kunststoff unter Druck eingefüllt wird und e) daß überschüssiges Kunststoffmaterial abgelassen wird. 1. Process for cleaning and coating pipelines intended for water management,
characterized, a) that water and compressed air are pressed into the empty pipes for rough cleaning, b) that an acid is then filled in under pressure and remains in the pipeline network for some time, c) that the pipes cleaned in this way are dried by means of compressed air, d) that a liquid plastic is filled under pressure to coat the pipes and e) that excess plastic material is drained. 2. Verfahren zur Reinigung und Beschichtung von zur Wasserführung bestimmten Rohrleitungen nach Anspruch 1,
dadurch gekennzeichnet,
daß zur Grobreinigung gemäß Verfahrenschritt a) ein Druckluft- Wassergemisch in die Rohrleitungen gepreßt wird.2. A method for cleaning and coating pipelines intended for water management according to claim 1,
characterized,
that a compressed air / water mixture is pressed into the pipes for rough cleaning in accordance with process step a). 3. Verfahren zur Reinigung und Beschichtung von zur Wasserführung bestimmten Rohrleitungen nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß vor der Beschichtung der Rohrleitungen gemäß Ver­fahrensschritt d) die Rohrleitungen an einzelnen Punk­ten mit Lüftungsstopfen verschlossen werden und nach dem Füllen mittels des flüssigen Kunststoffes an diesen Punkten entlüftet wird.3. A method for cleaning and coating pipelines intended for water management according to claim 1 or 2,
characterized,
that before the coating of the pipelines according to process step d) the pipelines are closed at individual points with ventilation plugs and after filling with the liquid plastic is vented at these points. 4. Verfahren zur Reinigung und Beschichtung von zur Wasserführung bestimmten Rohrleitungen nach mindestens einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
daß der gemäß Verfahrensschritt d) eingefüllte Kunst­stoff unter etwa 6 atü Druck etwa eine Stunde lang in der Leitung verbleibt.4. A method for cleaning and coating pipelines intended for water management according to at least one of the preceding claims,
characterized,
that the plastic filled in according to process step d) remains in the line under about 6 atm pressure for about an hour. 5. Verfahren zur Reinigung und Beschichtung von zur Wasserführung bestimmten Rohrleitungen nach mindestens einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
daß anschließend an Verfahrensschritt e) das überschüs­sige, nicht an den Wandungen der Rohrleitungen haftende Kunststoffmaterial mittels Preßluft von sämtlichen Hochpunkten aus ausgeblasen wird.5. A method for cleaning and coating pipelines intended for water management according to at least one of the preceding claims,
characterized,
that after process step e) the excess plastic material not adhering to the walls of the pipelines is blown out from all high points by means of compressed 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 true EP0326867A2 (en) 1989-08-09
EP0326867A3 EP0326867A3 (en) 1990-11-07
EP0326867B1 EP0326867B1 (en) 1992-11-25
EP0326867B2 EP0326867B2 (en) 1997-02-26

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ID=6346671

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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)

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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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EP0634229A1 (en) * 1993-07-12 1995-01-18 Promotec AG Method, assembly and apparatus for internal cleaning and coating of pipelines
WO1996031298A1 (en) * 1995-04-07 1996-10-10 Firma Aqua-Protect Gesellschaft Für Wasserleitungssanierung Gmbh & Co. Kg Process for cleaning and coating pipes or pipework especially for conveying water

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US5360488A (en) * 1993-03-23 1994-11-01 H.E.R.C. Products Incorporated Method of cleaning and maintaining water distribution pipe systems
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US5380564A (en) * 1992-04-28 1995-01-10 Progressive Blasting Systems, Inc. High pressure water jet method of blasting low density metallic surfaces
AU1731195A (en) * 1994-01-27 1995-08-15 Engelhard Corporation Process for recovering catalyst supports
US5529637A (en) * 1994-02-17 1996-06-25 Hydrochem Industrial Services, Inc. Formic-carboxylic acid mixtures for removing iron oxide sclae from steel surfaces
US5699817A (en) * 1995-05-11 1997-12-23 Graco Inc Turbulent flow conduit cleaning apparatus
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Also Published As

Publication number Publication date
DE58902786D1 (en) 1993-01-07
EP0326867B1 (en) 1992-11-25
ES2036724T5 (en) 1997-06-01
JPH01231972A (en) 1989-09-18
EP0326867A3 (en) 1990-11-07
GR3007021T3 (en) 1993-07-30
ATE82709T1 (en) 1992-12-15
GR3023475T3 (en) 1997-08-29
ES2036724T3 (en) 1993-06-01
US5045352A (en) 1991-09-03
DE3803410A1 (en) 1989-08-17
EP0326867B2 (en) 1997-02-26

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