EP1973674A1 - Cleaning pig - Google Patents

Cleaning pig

Info

Publication number
EP1973674A1
EP1973674A1 EP06753955A EP06753955A EP1973674A1 EP 1973674 A1 EP1973674 A1 EP 1973674A1 EP 06753955 A EP06753955 A EP 06753955A EP 06753955 A EP06753955 A EP 06753955A EP 1973674 A1 EP1973674 A1 EP 1973674A1
Authority
EP
European Patent Office
Prior art keywords
pig
cleaning
sleeves
suction
opening
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.)
Granted
Application number
EP06753955A
Other languages
German (de)
French (fr)
Other versions
EP1973674B1 (en
Inventor
Patrik Rosen
Hubert Linder
Franck Fielers
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.)
Rosen Swiss AG
Original Assignee
Rosen Swiss AG
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 Rosen Swiss AG filed Critical Rosen Swiss AG
Publication of EP1973674A1 publication Critical patent/EP1973674A1/en
Application granted granted Critical
Publication of EP1973674B1 publication Critical patent/EP1973674B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
    • B08B9/0553—Cylindrically shaped pigs
    • 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
    • B08B9/035—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing by suction
    • 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
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
    • B08B9/0557—Pigs with rings shaped cleaning members, e.g. cup shaped pigs
    • 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
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
    • B08B9/0558—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles with additional jet means

Definitions

  • the invention relates to a cleaning pig according to the preamble of claim 1.
  • Cleaning pigs of this type are intended for pipelines before commissioning the line or for periodic cleaning and maintenance, both gas pipelines as well as pipelines for liquid transport, be it oil, water or any chemical liquid product. Dirt or deposits on the pipe walls can be solved in many cases by the streaking or grinding action of the sleeves and possibly additionally pressed against the pipe wall brushes and with the gas or the liquid, which also drives the pig to move. However, there are cases where the influence of cuffs or brushes on deposits on the tube walls remains inadequate.
  • the object of the invention is therefore to provide a cleaning pig, which can be used in the manner of conventional cleaning pigs and with the transported fluid substance is mecanicwegbar, but causes a special cleaning on the pipe walls such as dusts a better cleaning effect and less wear of the pig, especially in the region of its sleeves.
  • this object is achieved by a pig according to the preamble of claim 1, starting with the characterizing features of claim 1. It has been shown that with a jet opening directed onto the pipe wall via a jet opening prevents particles from remaining on the pipe wall and being run over by sleeves (or even brushes) without detaching. Such a jet opening can be supplied by the fluidic medium through a rear-side pressure opening, so that the entrainment of a separate energy source is dispensable for this purpose.
  • the slowed speed of the cleaning pig against the surrounding fluid in the pipeline also prevents accumulation of debris in the region of the pig, as had previously been found in the purely mechanical cleaning by the action of cuffs or brushes.
  • the dirt material which has been released from the pipe wall through the jet opening is sucked off and discharged from the pig to the front.
  • an aspirator which is connected via a suction line with a lying in the direction of travel before the pressure port suction outlet.
  • the blow opening in the direction of travel opens in front of the suction, so that within the pig between the sleeves a flow direction from the jet opening to the aspirator to the rear and thus in accordance with the forward movement of the pig results.
  • the suction outlet may be connected to a jet conveyer or the like aerodynamic suction generator passed longitudinally through the pig to promote the suction effect by increased suction. Similar effects can be achieved, for example, by a jet blower or by a Venturi nozzle.
  • 1 is a longitudinal section through a pig in a tube
  • Fig. 4 shows a longitudinal section through a pig according to a third embodiment.
  • a cleaning pig generally designated 1 is shown in use in a pipeline 2, which serves for example as a gas pipe, in principle but also a liquid pipe could be about the long-distance transport of oil, water or chemical liquids.
  • Pipelines for the long-distance transportation of gas or crude oil are typically divided into long sections averaging 70 kilometers, but may also have sections of several hundred kilometers, through which cleaning pigs - as well as separation pigs for separating successive batches of fluid substances delivered in the pipeline or also measuring pigs to check the pipeline 2 - have to run before they can be intercepted in a station, taken out and controlled.
  • a cleaning pig of the type considered here usually has a supporting pig body 3, from which at least two mutually spaced sleeves 4, 5 of an elastic but highly abrasion-resistant material, such as polyurethane, protrude radially outward and bear against the inside of the pipe.
  • These sleeves 4.5 close on the one hand, the tube cross-section from so far that the cleaning pig 1 "swims" with the funded in the pipeline fluid substance, ie backward receives a sufficient pressure compared to the pressure on the front in the direction of movement, the Frictions on the pipe wall as well as the inertia of the pig and possibly also the effects of gravity on rising sections of such a pipeline overcomes.
  • the sleeves 4,5 are formed in a known manner substantially disc-shaped and in the present case with respect to a marked by an arrow 6 Neten moving direction of the cleaning pig 6 slightly plate-shaped backward to the outside, in order to reduce the sliding movement of the sleeves relative to the pipe inner wall and to improve the sealing abutment by the backward pressure of the fluidic substance.
  • wheels 7 are provided to a front end of the pig 1 out and wheels 8 to a rear end of the pig 1 towards sufficient yielding trained wheel jibs 9 and 10 extend to the inside of the pipe 2 out and center the pig and support it.
  • Such a centering and support is particularly indicated when a strong wear of the sleeves 4.5 must be expected at large section lengths of the pipe 2 and in particular in highly abrasive coatings on the inside of the pipe inner walls.
  • This may for example be the case with gas pipelines with dust deposits in the pipeline, which can be detected and removed by the cuffs only inadequate, but instead wear the cuffs heavily, so that their investment against the pipeline is inadequate.
  • the cleaning pig 1 has a special device which serves to remove deposits, in particular dust-like deposits, from the pipeline. solve and remove.
  • the pig 1 has an annular pressure opening 11 at the rear, which is recessed between the pig body 3 and the sleeve 5 and axially via a pressure line 12 in the form of an annular space leads to a jet opening 13, against the inner wall of the pipeline. 2 is directed.
  • the jet opening can be designed here in the manner of an annular, radially outwardly directed opening. It is understood that here, as an alternative, a ring of individual openings can be provided.
  • the jet opening 13 can also be narrowed in the form of a nozzle instead of the slightly widening shape in order to direct a sharpened jet onto the tube inner wall.
  • the detached from the pipe inner wall by means of the jet opening 13 deposits are received by a arranged in the direction of travel behind the jet opening 13 extractor 14 with a stream of fluidic substance and transported via a centrally in the pig body 3 forwardly guided suction line 15 to a suction outlet 16 at the front ,
  • a flow through the cleaning pig 1 from the pressure port 11 to the suction outlet 16 wherein the suction outlet is in the direction of travel before the pressure opening.
  • the flow through the area between the sleeves 4 and 5 direction of travel is directed backwards.
  • the aspirator 14 is formed by a ring annularly distributed on the circumference of the pig suction elements 17 which lead via radial connections 18 which pass through the pressure line 12 in the suction line 15. It is understood that the suction elements 17 could also be designed in the form of a ring-shaped continuous suction.
  • brushes between the sleeves on the pig body 3, here on an outer jacket 20 of the pressure line 12, with a parallelogram 21 are further attached, which also causes an elastic pressure to the outside.
  • These brushes 19 are arranged in the direction of travel in front of the aspirator 14, so that the extractor 14 detects the detached from the brush 19 deposits in the backward flow.
  • FIG. 3 shows an embodiment of a cleaning pig 22 which is identical in various elements, wherein the matching elements are provided with the same reference symbols as in FIG. 1 and will not be explained again below.
  • the peculiarity of this embodiment lies in an increased suction effect.
  • a suction line 23 with a Venturi nozzle 24 or a similar-acting aerodynamic Sogerzeuger approximately in the form of a jet pump or a jet blower.
  • the venturi nozzle 24 has a nozzle-narrowing inlet 25 and a diffuser-like widening spout 26 and is in a narrowed area therebetween high flow rate and low pressure suitable to achieve the desired high suction for the aspirator 14.
  • a further variant of a cleaning pig 27 according to FIG. 4 has a construction largely identical to the cleaning pig 22 according to FIG. 3, so that individual elements are again identified by the same reference numerals.
  • the cleaning pig 27 differs from the cleaning pig 22 in that instead of the wheels 7,8 for centering and supporting the cleaning pig 27 brushes 28 in the front region of the pig and brush 29 in the rear region, each outside of the limited length of the sleeves 4,5 , are provided, which press in a ring-shaped distribution on the circumference of the pig fegend against the inner wall of the pipe 2 and thus develop an additional cleaning effect.
  • the brushes are 28,29 on movable Ausle- ger 30,31 resiliently supported in order to adapt to wear or changing configurations of the inner cross section of the pipeline in the sense of a uniform pressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Cleaning In General (AREA)

Abstract

A cleaning pig (1, 22, 27) for pipelines (2) for the long-distance transportation of fluidic substances, having a pig body (3) which, via at least two sleeves (4, 5) which are spaced apart from one another in longitudinal direction of the pig, fills the pipe cross section and is advanced in a predetermined direction of travel (6) by the fluidic substance transported in the pipeline (2), is configured in that the pig (1, 22, 27) has at least one rear pressure opening (11) which leads, via a pressure line (12), to at least one jet opening (13), opening out into an interspace between the sleeves (4, 5) and directed onto the inner wall of the pipeline, in order to achieve a better cleaning action and a lower level of wear to the sleeves by way of a pig which can be used in the conventional manner and can be advanced in the pipe by the fluidic medium.

Description

Reinigungsmolch cleaning pig
Die Erfindung betrifft einen Reinigungsmolch nach dem Oberbegriff des Anspruchs 1. Reinigungsmolche dieser Art werden für Rohrleitungen vor der Inbetriebnahme der Leitung oder auch für periodische Reinigungen und Wartungen vorgesehen, und zwar sowohl bei Gasfernleitungen wie auch bei Rohrleitungen für den Flüssigkeitstransport, sei es Öl, Wasser oder irgendein chemisches Flüssigprodukt. Verschmutzungen oder Ablagerungen an den Rohrwänden lassen sich in vielen Fällen durch die Streif- oder Schleifwirkung der Manschetten und ggf. durch zusätzlich noch gegen die Rohrwandung angedrückte Bürsten lösen und mit dem Gas oder der Flüssigkeit, die auch den Molch vortreibt, fortbewegen. Es gibt allerdings Fälle, in denen die Einwirkung von Manschetten oder Bürsten auf Ablagerungen an den Rohrwänden unzulänglich bleibt.The invention relates to a cleaning pig according to the preamble of claim 1. Cleaning pigs of this type are intended for pipelines before commissioning the line or for periodic cleaning and maintenance, both gas pipelines as well as pipelines for liquid transport, be it oil, water or any chemical liquid product. Dirt or deposits on the pipe walls can be solved in many cases by the streaking or grinding action of the sleeves and possibly additionally pressed against the pipe wall brushes and with the gas or the liquid, which also drives the pig to move. However, there are cases where the influence of cuffs or brushes on deposits on the tube walls remains inadequate.
So finden sich insbesondere in manchen Gasfernleitungen Staubablagerungen an den Rohrwänden, die beim Durchlauf eines Molchs weitestgehend an den Wänden haften bleiben und teilweise sogar mit hochabrasiver Wirkung zu einer starken Abnutzung der Manschetten des Molches führen. Damit wird die Abstreifungsfunktion der Manschetten noch weiter gemindert.Thus, in particular in some gas pipelines dust deposits on the pipe walls, which remain largely adhering to the walls during the passage of a pig and sometimes even lead with high abrasives effect to a strong wear of the sleeves of the pig. Thus, the Abstreifungsfunktion the cuffs is further reduced.
Aufgabe der Erfindung ist es somit, einen Reinigungsmolch zu schaffen, der nach Art herkömmlicher Reinigungsmolche einsetzbar und mit dem zu transportierenden fluidischen Stoff vorbewegbar ist, der aber bei besonderen Ablagerungen an den Rohrwänden wie beispielsweise von Stäuben eine bessere Reinigungswirkung und eine geringere Abnutzung des Molches insbesondere im Bereich seiner Manschetten bewirkt.The object of the invention is therefore to provide a cleaning pig, which can be used in the manner of conventional cleaning pigs and with the transported fluid substance is vorbewegbar, but causes a special cleaning on the pipe walls such as dusts a better cleaning effect and less wear of the pig, especially in the region of its sleeves.
Gemäß der Erfindung wird diese Aufgabe von einem Molch nach dem Oberbegriff des Anspruchs 1 ausgehend mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Es hat sich gezeigt, daß mit einem über eine Strahlöffnung auf die Rohrwandung gerichtete Strahleinwirkung verhindert, daß Partikel an der Rohrwandung sitzen bleiben und von Manschetten (oder auch Bürsten) überfahren werden, ohne sich abzulösen. Eine solche Strahlöffnung kann von dem fluidischen Medium durch eine rückseitige Drucköffnung versorgt werden, so daß das Mitführen einer gesonderten Energiequelle hierfür entbehrlich ist. Die damit eröffnete Passage des fluidischen Stoffes durch den Reinigungsmolch hindurch bringt aber auch eine Verlangsamung der Fahrgeschwindigkeit des Molchs gegenüber dem fluidischen Stoff in der Rohrleitung mit sich, läßt sich aber verläßlich in der Weise auslegen, daß der Reinigungsmolch in Vorbewegung bleibt. Die verlangsamte Geschwindigkeit des Reinigungsmolchs gegenüber dem umgebenden fluidischen Stoff in der Rohrleitung verhindert überdies eine Anhäufung von Schmutzpartikeln im Bereich des Molches, wie sie bei der rein mechanischen Reinigung durch die Einwirkung von Manschetten oder Bürsten bisher festzustellen war.According to the invention, this object is achieved by a pig according to the preamble of claim 1, starting with the characterizing features of claim 1. It has been shown that with a jet opening directed onto the pipe wall via a jet opening prevents particles from remaining on the pipe wall and being run over by sleeves (or even brushes) without detaching. Such a jet opening can be supplied by the fluidic medium through a rear-side pressure opening, so that the entrainment of a separate energy source is dispensable for this purpose. The thus opened passage of the fluidic substance through the cleaning pig through but also brings a slowing down the speed of the pig against the fluidic substance in the pipeline with it, but can be interpreted reliably in such a way that the cleaning pig remains in motion. The slowed speed of the cleaning pig against the surrounding fluid in the pipeline also prevents accumulation of debris in the region of the pig, as had previously been found in the purely mechanical cleaning by the action of cuffs or brushes.
Vorzugsweise wird das durch die Strahlöffnung von der Rohrwandung gelöste Schmutzmaterial abgesaugt und vom Molch nach vorne hin abgegeben. Dies wird zweckmäßig mit einem Absauger erreicht, der über eine Saugleitung mit einem in Fahrtrichtung vor der Drucköffnung liegenden Saugauslaß verbunden ist.Preferably, the dirt material which has been released from the pipe wall through the jet opening is sucked off and discharged from the pig to the front. this will expediently achieved with an aspirator, which is connected via a suction line with a lying in the direction of travel before the pressure port suction outlet.
Vorteilhaft wird vorgesehen, daß die Blasöffnung in Fahrtrichtung vor dem Absauger ausmündet, so daß sich innerhalb des Molchs zwischen den Manschetten eine Strömungsrichtung von der Strahlöffnung zum Absauger nach hinten zu und damit in Übereinstimmung mit der Vorbewegung des Molchs ergibt.Advantageously, it is provided that the blow opening in the direction of travel opens in front of the suction, so that within the pig between the sleeves a flow direction from the jet opening to the aspirator to the rear and thus in accordance with the forward movement of the pig results.
Der Saugauslaß kann an einen in Längsrichtung durch den Molch hindurchgeführten Strahlförderer oder dergleichen strömungstechnischen Sogerzeuger angeschlossen sein, um die Absaugwirkung durch einen erhöhten Sog zu fördern. Ähnliche Effekte lassen sich beispielsweise durch ein Strahlgebläse oder durch eine Venturi-Düse erzielen.The suction outlet may be connected to a jet conveyer or the like aerodynamic suction generator passed longitudinally through the pig to promote the suction effect by increased suction. Similar effects can be achieved, for example, by a jet blower or by a Venturi nozzle.
Drei Ausführungsbeispiele für den Gegenstand der Erfindung sind in der Zeichnung dargestellt und werden nachfolgend näher beschrieben. In der Zeichnung zeigen:Three embodiments of the subject invention are illustrated in the drawings and will be described in more detail below. In the drawing show:
Fig. 1 ein Längsschnitt durch einen Molch in einem Rohr,1 is a longitudinal section through a pig in a tube,
Fig. 2 Schnitt nach Linie H-Il in Fig. 1 ,2 is a section along line H-II in Fig. 1,
Fig. 3 Längsschnitt durch einen weiteren Molch undFig. 3 longitudinal section through another pig and
Fig. 4 Längsschnitt durch einen Molch nach einer dritten Ausführungsform.Fig. 4 shows a longitudinal section through a pig according to a third embodiment.
In Fig. 1 ist ein insgesamt mit 1 bezeichneter Reinigungsmolch im Einsatz in einer Rohrleitung 2 dargestellt, welches beispielsweise als Gasrohr dient, grundsätzlich aber auch ein Flüssigkeitsrohr etwa zum Ferntransport von Öl, Wasser oder chemischen Flüssigkeiten sein könnte. Rohrleitungen für den Ferntransport von Gas oder Rohöl sind typischerweise in lange Abschnitte von durchschnittlich 70 Kilometer unterteilt, können aber auch Abschnitte von mehreren hundert Kilometern aufweisen, durch die hindurch Reinigungsmolche - genauso wie Trennmolche zum Abgrenzen aufeinander zu fördernder Chargen der in der Rohrleitung geförderten fluidischen Stoffe oder auch Meßmolche zur Überprüfung der Rohrleitung 2 - laufen müssen, ehe sie in einer Station abgefangen, herausgenommen und kontrolliert werden können.In Fig. 1, a cleaning pig generally designated 1 is shown in use in a pipeline 2, which serves for example as a gas pipe, in principle but also a liquid pipe could be about the long-distance transport of oil, water or chemical liquids. Pipelines for the long-distance transportation of gas or crude oil are typically divided into long sections averaging 70 kilometers, but may also have sections of several hundred kilometers, through which cleaning pigs - as well as separation pigs for separating successive batches of fluid substances delivered in the pipeline or also measuring pigs to check the pipeline 2 - have to run before they can be intercepted in a station, taken out and controlled.
Ein Reinigungsmolch der hier betrachteten Art weist in üblicherweise einen tragenden Molchkörper 3 auf, von dem aus zumindest zwei voneinander beabstandete Manschetten 4,5 aus einem elastischen aber hoch abriebfesten Material wie beispielsweise Polyurethan radial nach außen vorstehen und sich an die Rohrleitung innenseitig anlegen. Diese Manschetten 4,5 schließen zum einen den Rohrquerschnitt so weit ab, daß der Reinigungsmolch 1 mit dem in der Rohrleitung geförderten fluidischen Stoff "mitschwimmt", also rückwärtig einen hinreichenden Druck im Vergleich zu dem Druck an der in Bewegungsrichtung vornliegenden Seite erhält, der die Reibungen an der Rohrleitungs-Wand sowie die Massenträgheit des Molchs und auch evtl. Schwerkraftwirkungen bei ansteigenden Abschnitten einer solchen Rohrleitung überwindet.A cleaning pig of the type considered here usually has a supporting pig body 3, from which at least two mutually spaced sleeves 4, 5 of an elastic but highly abrasion-resistant material, such as polyurethane, protrude radially outward and bear against the inside of the pipe. These sleeves 4.5 close on the one hand, the tube cross-section from so far that the cleaning pig 1 "swims" with the funded in the pipeline fluid substance, ie backward receives a sufficient pressure compared to the pressure on the front in the direction of movement, the Frictions on the pipe wall as well as the inertia of the pig and possibly also the effects of gravity on rising sections of such a pipeline overcomes.
Die Manschetten 4,5 sind in bekannter Weise im wesentlichen scheibenförmig ausgebildet und im vorliegenden Fall bezüglich einer durch einen Pfeil 6 gekennzeich- neten Bewegungsrichtung des Reinigungsmolchs 6 leicht tellerförmig nach außen zurückfliehend, um die Gleitbewegung der Manschetten gegenüber der Rohrleitungs-Innenwand zu mindern und die dichtende Anlage durch den rückwärtigen Druck des fluidischen Stoffes zu verbessern.The sleeves 4,5 are formed in a known manner substantially disc-shaped and in the present case with respect to a marked by an arrow 6 Neten moving direction of the cleaning pig 6 slightly plate-shaped backward to the outside, in order to reduce the sliding movement of the sleeves relative to the pipe inner wall and to improve the sealing abutment by the backward pressure of the fluidic substance.
Während einfache Molchausführungen bisweilen den Manschetten auch die Zentrierung und Abstützung des Molchs 1 gegenüber der Innenwand überlassen, sind im vorliegenden Fall Räder 7 zu einem vorderen Ende des Molchs 1 hin und Räder 8 zu einem hinteren Ende des Molchs 1 hin vorgesehen, die sich an hinreichend nachgiebig ausgebildeten Radauslegern 9 bzw. 10 zur Innenseite der Rohrleitung 2 hin erstrecken und den Molch damit zentrieren und abstützen.While simple pig executions sometimes leave the cuffs and the centering and support of the pig 1 against the inner wall, in the present case, wheels 7 are provided to a front end of the pig 1 out and wheels 8 to a rear end of the pig 1 towards sufficient yielding trained wheel jibs 9 and 10 extend to the inside of the pipe 2 out and center the pig and support it.
Eine solche Zentrierung und Abstützung ist insbesondere dann angezeigt, wenn eine starke Abnutzung der Manschetten 4,5 bei großen Abschnittslängen der Rohrleitung 2 und insbesondere auch bei hochabrasiven Belägen an der Innenseite der Rohrinnenwände gerechnet werden muß. Dies kann beispielsweise bei Gasfernleitungen mit Staubablagerungen in der Rohrleitung der Fall sein, die durch die Manschetten nur unzulänglich erfaßt und fortgeschafft werden können, statt dessen aber die Manschetten stark verschleißen, so daß deren Anlage gegenüber der Rohrleitung mangelhaft wird. Damit wird sowohl die Reinigungswirkung wie auch der Vortrieb des Reinigungsmolchs in Frage gestellt.Such a centering and support is particularly indicated when a strong wear of the sleeves 4.5 must be expected at large section lengths of the pipe 2 and in particular in highly abrasive coatings on the inside of the pipe inner walls. This may for example be the case with gas pipelines with dust deposits in the pipeline, which can be detected and removed by the cuffs only inadequate, but instead wear the cuffs heavily, so that their investment against the pipeline is inadequate. Thus, both the cleaning effect as well as the propulsion of the cleaning pig into question.
Der Reinigungsmolch 1 weist eine besondere Einrichtung auf, die dazu dient, Ablagerungen, insbesondere auch staubförmige Ablagerungen, von der Rohrleitung ab- zulösen und zu entfernen. In dieser Hinsicht weist der Molch 1 eine ringförmige Drucköffnung 11 an der Rückseite auf, die zwischen dem Molchkörper 3 und der Manschette 5 ausgespart ist und axial über eine Druckleitung 12 in Form eines Ringraums zu einer Strahlöffnung 13 führt, die gegen die Innenwand der Rohrleitung 2 gerichtet ist. Die Strahlöffnung kann hier nach Art einer ringförmigen, radial nach außen gerichteten Öffnung ausgebildet sein. Es versteht sich, daß hier alternativ auch ein Kranz von Einzelöffnungen vorgesehen sein kann. Die Strahlöffnung 13 kann anstatt der sich leicht aufweitenden Form auch verengt als Düse ausgebildet sein, um einen verschärften Strahl auf die Rohrinnenwand zu richten.The cleaning pig 1 has a special device which serves to remove deposits, in particular dust-like deposits, from the pipeline. solve and remove. In this regard, the pig 1 has an annular pressure opening 11 at the rear, which is recessed between the pig body 3 and the sleeve 5 and axially via a pressure line 12 in the form of an annular space leads to a jet opening 13, against the inner wall of the pipeline. 2 is directed. The jet opening can be designed here in the manner of an annular, radially outwardly directed opening. It is understood that here, as an alternative, a ring of individual openings can be provided. The jet opening 13 can also be narrowed in the form of a nozzle instead of the slightly widening shape in order to direct a sharpened jet onto the tube inner wall.
Die von der Rohrinnenwand mit Hilfe der Strahlöffnung 13 abgelösten Ablagerungen werden durch einen in Fahrtrichtung hinter der Strahlöffnung 13 angeordneten Absauger 14 mit einem Strom des fluidischen Stoffes aufgenommen und über eine zentral im Molchkörper 3 nach vorne geführte Saugleitung 15 zu einem Saugauslaß 16 an der Vorderseite transportiert. Es entsteht hier also eine Durchströmung des Reinigungsmolchs 1 von der Drucköffnung 11 zum Saugauslaß 16, wobei der Saugauslaß in Fahrtrichtung vor der Drucköffnung liegt. Dabei ist allerdings die Durchströmung des Bereichs zwischen den Manschetten 4 und 5 hin Fahrtrichtung nach hinten gerichtet. Dies erleichtert die Aufnahme der abgelösten Ablagerungen, wenn etwa in einer Gasrohrleitung ein Gasstrom von 5 bis 10 m/s eingerichtet ist und der Reinigungsmolch demgegenüber mit einer Geschwindigkeit von 1 m/s oder wenigen m/s fährt. Der Absauger 14 ist durch einen Kranz ringförmig am Umfang des Molchs verteilter Absaugelemente 17 gebildet, die über radiale Verbindungen 18, die die Druckleitung 12 durchgreifen, in die Saugleitung 15 führen. Es versteht sich, daß die Absaugelemente 17 auch in Form eines ringförmig durchlaufenden Absaugers ausgebildet sein könnten.The detached from the pipe inner wall by means of the jet opening 13 deposits are received by a arranged in the direction of travel behind the jet opening 13 extractor 14 with a stream of fluidic substance and transported via a centrally in the pig body 3 forwardly guided suction line 15 to a suction outlet 16 at the front , Thus, there is a flow through the cleaning pig 1 from the pressure port 11 to the suction outlet 16, wherein the suction outlet is in the direction of travel before the pressure opening. However, the flow through the area between the sleeves 4 and 5 direction of travel is directed backwards. This facilitates the absorption of the detached deposits, if, for example, a gas flow of 5 to 10 m / s is set up in a gas pipeline and the cleaning pig, on the other hand, travels at a speed of 1 m / s or a few m / s. The aspirator 14 is formed by a ring annularly distributed on the circumference of the pig suction elements 17 which lead via radial connections 18 which pass through the pressure line 12 in the suction line 15. It is understood that the suction elements 17 could also be designed in the form of a ring-shaped continuous suction.
Zur Unterstützung der Ablösung von Ablagerungen an der Rohrleitung 2 sind weiterhin Bürsten zwischen den Manschetten am Molchkörper 3, hier an einem Außenmantel 20 der Druckleitung 12, mit einer Parallelogrammführung 21 angebracht, die auch einen elastischen Andruck nach außen bewirkt. Auch diese Bürsten 19 sind in Fahrtrichtung vor dem Absauger 14 angeordnet, so daß der Absauger 14 bei der nach hinten verlaufenden Strömung auch die von den Bürsten 19 abgelösten Ablagerungen erfaßt.To support the detachment of deposits on the pipe 2 brushes between the sleeves on the pig body 3, here on an outer jacket 20 of the pressure line 12, with a parallelogram 21 are further attached, which also causes an elastic pressure to the outside. These brushes 19 are arranged in the direction of travel in front of the aspirator 14, so that the extractor 14 detects the detached from the brush 19 deposits in the backward flow.
Die Fig. 3 zeigt eine in verschiedenen Elementen übereinstimmende Ausführungsform eines Reinigungsmolchs 22, wobei die übereinstimmenden Elemente mit den gleichen Bezugszeichen wie in Fig. 1 versehen sind und im folgenden nicht noch einmal erläutert werden. Die Besonderheit dieser Ausführungsform liegt in einer verstärkten Absaugwirkung. Anstelle der einfachen, zentral nach vorne durchgeführten Saugleitung 15 ist der Absauger 14 über eine Saugleitung 23 mit einer Venturi-Düse 24 oder einem ähnlich wirkenden strömungstechnischen Sogerzeuger etwa in Form einer Strahlpumpe oder eines Strahlgebläses verbunden. Die Venturi-Düse 24 weist einen sich düsenförmig verengenden Einlauf 25 und einen sich diffusorartig aufweitenden Auslauf 26 auf und ist in einem dazwischenliegenden verengten Bereich hoher Durchströmungsgeschwindigkeit und niederen Druckes geeignet, die gewünschte hohe Saugwirkung für den Absauger 14 zu erzielen. Dies verstärkt auch die Durchströmung des Bereichs zwischen den Manschetten von der Strahlöffnung 13 zum Absauger 14 und verbessert damit die Abförderung gelöster schwebender Ablagerungspartikel. Die für die Erzielung der Saugleistung benötigte Durchströmung geht zwar mit einer Verlangsamung der Fahrt des Reinigungsmolchs 22 gegenüber dem umgebenden Gas- oder Flüssigkeitsstrom einher und ist auch im Sinne eines verläßlichen Vortriebs des Reinigungsmolchs 22 einzugrenzen, führt aber ansonsten infolge der größeren Geschwindigkeitsdifferenz zwischen dem in der Rohrleitung transportierten fluidϊschen Stoff und dem Reinigungsmolch dazu, daß die gelösten Ablagerungen abtransportiert werden und sich nicht etwa - wie bei herkömmlichen, nur mit Manschetten arbeitenden Reinigungsmolchen - im Molchbereich ansammeln.FIG. 3 shows an embodiment of a cleaning pig 22 which is identical in various elements, wherein the matching elements are provided with the same reference symbols as in FIG. 1 and will not be explained again below. The peculiarity of this embodiment lies in an increased suction effect. Instead of the simple, centrally forward suction line 15 of the suction device 14 is connected via a suction line 23 with a Venturi nozzle 24 or a similar-acting aerodynamic Sogerzeuger approximately in the form of a jet pump or a jet blower. The venturi nozzle 24 has a nozzle-narrowing inlet 25 and a diffuser-like widening spout 26 and is in a narrowed area therebetween high flow rate and low pressure suitable to achieve the desired high suction for the aspirator 14. This also enhances the flow of the area between the sleeves from the jet opening 13 to the aspirator 14 and thus improves the removal of dissolved suspended sediment particles. Although the flow required to achieve the suction power is accompanied by a slowing down the drive of the cleaning pig 22 relative to the surrounding gas or liquid flow and is also in the sense of a reliable propulsion of the cleaning pig 22 narrow, but otherwise leads due to the greater speed difference between in the Pipeline transported fluidschenschen and the cleaning pig to the fact that the dissolved deposits are removed and not about - as in conventional, working only with cuffs cleaning pig - accumulate in the pig area.
Eine weitere Variante eines Reinigungsmolchs 27 gemäß Fig. 4 weist einen größtenteils mit dem Reinigungsmolch 22 nach Fig. 3 übereinstimmenden Aufbau auf, so daß einzelne Elemente auch wieder mit den gleichen Bezugszeichen gekennzeichnet sind. Der Reinigungsmolch 27 unterscheidet sich von dem Reinigungsmolch 22 dadurch, daß statt der Räder 7,8 zur Zentrierung und Abstützung des Reinigungsmolchs 27 Bürsten 28 im vorderen Bereich des Molchs und Bürsten 29 im hinteren Bereich, jeweils außerhalb des von den Manschetten 4,5 begrenzten Längsbereichs, vorgesehen sind, die in einer kranzförmigen Verteilung am Umfang des Molchs fegend gegen die Innenwand der Rohrleitung 2 andrücken und damit eine zusätzliche Reinigungswirkung entfalten. Dabei sind die Bürsten 28,29 über bewegliche Ausle- ger 30,31 nachgiebig abgestützt, um sich bei Abnutzung oder bei wechselnden Konfigurationen des Innenquerschnitts der Rohrleitung im Sinne eines gleichmäßigen Andrucks anpassen zu können. A further variant of a cleaning pig 27 according to FIG. 4 has a construction largely identical to the cleaning pig 22 according to FIG. 3, so that individual elements are again identified by the same reference numerals. The cleaning pig 27 differs from the cleaning pig 22 in that instead of the wheels 7,8 for centering and supporting the cleaning pig 27 brushes 28 in the front region of the pig and brush 29 in the rear region, each outside of the limited length of the sleeves 4,5 , are provided, which press in a ring-shaped distribution on the circumference of the pig fegend against the inner wall of the pipe 2 and thus develop an additional cleaning effect. In this case, the brushes are 28,29 on movable Ausle- ger 30,31 resiliently supported in order to adapt to wear or changing configurations of the inner cross section of the pipeline in the sense of a uniform pressure.

Claims

Ansprüche: Claims:
1. Reinigungsmolch (1 , 22, 27) für Rohrleitungen (2) zum Ferntransport fluidischer Stoffe mit einem Molchkörper (3), der über zumindest zwei in Längsrichtung des Molchs voneinander beabstandete Manschetten (4, 5) den Rohrquerschnitt ausfüllt und mit dem in der Rohrleitung (2) transportierten fluidischen Stoff in einer vorgegebenen Fahrtrichtung (6) vorgetrieben wird, dadurch gekennzeichnet, daß der Molch (1 , 22, 27) zumindest eine rückseitige Drucköffnung (11) aufweist, die über eine Druckleitung (12) zu wenigstens einer in einem Zwischenraum zwischen den Manschetten (4, 5) ausmündenden und auf die Innenwand der Rohrleitung gerichteten Strahlöffnung (13) führt.1. cleaning pig (1, 22, 27) for pipelines (2) for the remote transport of fluid substances with a pig body (3) over at least two spaced apart in the longitudinal direction of the pig sleeves (4, 5) fills the pipe cross-section and with the in the Pipeline (2) transported fluidic material in a predetermined direction of travel (6) is driven, characterized in that the pig (1, 22, 27) at least one rear-side pressure port (11) via a pressure line (12) to at least one in an opening between the sleeves (4, 5) and directed towards the inner wall of the pipe jet opening (13) leads.
2. Reinigungsmolch nach Anspruch 1 , dadurch gekennzeichnet, daß der Molch (1 , 22, 27) im Zwischenraum zwischen den Manschetten (4, 5) zumindest einen Absauger (14) aufweist, der über eine Saugleitung (12, 23) mit zumindest einem in Fahrtrichtung vor der Drucköffnung (11) liegenden Saugauslaß (16, 24) verbunden ist.2. cleaning pig according to claim 1, characterized in that the pig (1, 22, 27) in the space between the sleeves (4, 5) has at least one suction device (14) via a suction line (12, 23) with at least one in the direction of travel in front of the pressure opening (11) lying Saugauslaß (16, 24) is connected.
3. Reinigungsmolch nach Anspruch 2, dadurch gekennzeichnet daß die Strahlöffnung (13) in Fahrtrichtung vor dem Absauger (14) ausmündet. 3. cleaning pig according to claim 2, characterized in that the jet opening (13) opens in the direction of travel in front of the suction device (14).
4. Reinigungsmolch nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß der Saugauslaß (16) an eine in Längsrichtung durch den Molch (22, 27) hindurchgeführte Venturi-Düse (24) angeschlossen ist.4. cleaning pig according to claim 2 or 3, characterized in that the suction outlet (16) is connected to a longitudinally through the pig (22, 27) guided Venturi nozzle (24).
5. Reinigungsmolch nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet daß die Druckleitung (12) mit einem Kranz umfangsseitiger Strahlöffnungen verbunden ist.5. cleaning pig according to one of claims 1 to 4, characterized in that the pressure line (12) is connected to a ring of peripheral jet openings.
6. Reinigungsmolch nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet daß die Strahlöffnung (12) als über den Umfang des Molchs erstreckte Ringdüse ausgebildet ist.6. cleaning pig according to one of claims 1 to 4, characterized in that the jet opening (12) is formed as extending over the circumference of the pig ring nozzle.
7. Reinigungsmolch nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet daß der Absauger (14) sich ringförmig am Umfang de Molchs erstreckt.7. cleaning pig according to one of claims 2 to 6, characterized in that the suction device (14) extends annularly on the circumference de pig.
8. Reinigungsmolch nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet daß der Absauger (14) in Form eines am Umfang des Molchs verteilten Kranzes von Absaugelementen (17) ausgebildet ist. 8. cleaning pig according to one of claims 2 to 6, characterized in that the suction device (14) in the form of a distributed on the circumference of the pig ring of suction elements (17) is formed.
EP06753955.1A 2006-01-20 2006-05-30 Cleaning pig Not-in-force EP1973674B1 (en)

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DE202006000969U DE202006000969U1 (en) 2006-01-20 2006-01-20 cleaning pig
PCT/EP2006/005117 WO2007087833A1 (en) 2006-01-20 2006-05-30 Cleaning pig

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EP (1) EP1973674B1 (en)
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CA2637791C (en) 2013-11-19
WO2007087833A1 (en) 2007-08-09
UA92068C2 (en) 2010-09-27
EP1973674B1 (en) 2017-10-11
US20100162503A1 (en) 2010-07-01
CA2637791A1 (en) 2007-08-09
US8281444B2 (en) 2012-10-09
DE202006000969U1 (en) 2007-05-24
RU2429087C2 (en) 2011-09-20

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