EP0287405A1 - Verfahren und Vorrichtung zur Beseitigung von Verstopfungen durch Fernbedienung in mit Flüssigkeit gefüllten Rohrleitungen - Google Patents

Verfahren und Vorrichtung zur Beseitigung von Verstopfungen durch Fernbedienung in mit Flüssigkeit gefüllten Rohrleitungen Download PDF

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Publication number
EP0287405A1
EP0287405A1 EP88400506A EP88400506A EP0287405A1 EP 0287405 A1 EP0287405 A1 EP 0287405A1 EP 88400506 A EP88400506 A EP 88400506A EP 88400506 A EP88400506 A EP 88400506A EP 0287405 A1 EP0287405 A1 EP 0287405A1
Authority
EP
European Patent Office
Prior art keywords
frequency
harmonic
cylinder
pressure
mode
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
EP88400506A
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English (en)
French (fr)
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EP0287405B1 (de
Inventor
Jacques Simon
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.)
Orano Cycle SA
Original Assignee
Compagnie Generale des Matieres Nucleaires SA
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Publication of EP0287405A1 publication Critical patent/EP0287405A1/de
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Publication of EP0287405B1 publication Critical patent/EP0287405B1/de
Anticipated expiration legal-status Critical
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    • 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
    • B08B9/0325—Control mechanisms therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • 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
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F9/00—Arrangements or fixed installations methods or devices for cleaning or clearing sewer pipes, e.g. by flushing

Definitions

  • the invention relates to a method for remotely opening a pipe filled with liquid, as well as a device for implementing this method.
  • the disintegration of this plug can be done by introducing into the piping a mechanical member generally called a ferret.
  • a mechanical member generally called a ferret.
  • this technique cannot be used when the plug is formed in an inaccessible part.
  • it is not satisfactory because it leads to direct contact between the unblocking member and the generally radioactive products contained in the piping.
  • Another known uncorking technique consists in pressurizing the blocked part of the piping, by connecting it directly to the discharge orifice of a test pump. If this technique does not have the disadvantages of mechanical uncorking, it sometimes leads to the opposite of the desired result. Indeed, in some cases, the pressurization of the piping has the effect of tamping the plug, which makes uncorking by known methods practically impossible.
  • the object of the present invention is precisely a new process making it possible to remotely unclog a pipe filled with liquid, regardless of where the cap and without any risk of packing it.
  • a method for remotely unclogging a pipe filled with liquid characterized in that longitudinal pressure waves rich in harmonics are applied to one end of the pipe, an excitation frequency f e equal to the natural frequency (harmonic 1) of the incompressible mode of the system so that the harmonic n of this frequency is at the natural frequency (harmonic 1) of the compressible mode of the system, n being a integer at least equal to 1.
  • the pressure waves used are formed by pulse trains rich in harmonics, periodic and of low frequency (preferably less than 20 Hz).
  • the compliance of the system is then adjusted so that the harmonic 1 of the resonant frequency of the incompressible mode has a harmonic of frequency equal to the frequency of the harmonic 1 of the resonant frequency of the compressible mode.
  • the ratio between the duration I of a pulse and its period T is adjusted to a value for which the coefficient of the harmonic 1, 2 or 3 of the Fourier series development of the train of pulses is maximum.
  • the invention also relates to a device making it possible to implement the remote uncorking method as it has just been defined.
  • this device comprises a drain cylinder, a chamber of which can be connected to the piping, this cylinder comprising a piston driven in a reciprocating movement which is communicated to it by a motor cylinder, via '' a mechanical connection, this movement having the effect of generating in the system of pressure waves, the jack engine being powered by a hydraulic pressure source, via a servo-valve controlled by a regulator sensitive to the output signals delivered by at least one sensor linked to the engine cylinder and to input signals delivered by a generator signals, to give the pressure waves in the chamber of the drain cylinder the form of waves rich in harmonics.
  • this device further comprises an adjustable compliance device communicating with the chamber of the unblocking cylinder.
  • safety means are provided to cut off the supply to the motor cylinder when a pressure sensitive detector prevailing in the Unclogging cylinder chamber detects the rise of this pressure above a determined pressure threshold, as well as when the frequency of the pressure waves, measured by the signal generator, exceeds a determined frequency threshold.
  • FIG 1 there is shown a pipe 10 filled with liquid 12 and in which a plug 14 has formed which is to be eliminated.
  • a distance unblocking device 16 is connected to the end of the pipe 10.
  • this device 16 is designed to apply waves to the end of the pipe. of longitudinal pressure rich in harmonics.
  • This device 16 comprises a drain cylinder 18 composed of a piston 20 slidably received in a cylinder 22, inside which it defines a chamber 24.
  • the cylinder 22 is provided with connection means of conventional type (not shown ) through which the end of the pipe 10 communicates directly with the chamber 24.
  • the unblocking cylinder 18 is provided with an adjustable compliance capacity 28 communicating with the chamber 24 by a pipe 30. Inside the capacity 28, the liquid admitted by the pipe 30 is in contact with an elastic membrane 32 A compression spring 34 is interposed between the opposite face of the membrane 32 and the bottom of the capacity. The inside diameter of this capacity and the spring can be changed. In this way, the compliance of the system formed by the pipe 10 filled with liquid 12 can be adjusted. The liquid 12 is therefore present both in the chamber 24, the tank 28 under the membrane 32 and the pipe 10.
  • the unclogging device 16 further comprises a motor cylinder 36 controlling the unclogging cylinder 18.
  • the drive cylinder 36 is a conventional double-acting cylinder, composed of a piston 38 slidably received in a cylinder 40 inside which it defines a front chamber 42 and a rear chamber 44.
  • a mechanical connection constituted in the example represented by a rigid rod 46, connects the pistons 20 and 38 of the jacks 18 and 36, which are for this purpose axially aligned.
  • the pistons 20 and 38 are thus secured at a distance, so that they move together.
  • the front 42 and rear 44 chambers of the drive cylinder 36 communicate alternately via two pipes 48, 50 with a source of hydraulic pressure.
  • This pressure source is constituted by a conventional hydraulic group 52.
  • the supply of pressurized fluid to the chambers 42 or 44 of the motor cylinder 36 is effected by means of a servo-valve 54.
  • This servo-valve 54 is controlled by a regulator 56 sensitive to the signals delivered by one or more sensors 58 associated with the motor cylinder 36.
  • the sensors 58 comprise for example a sensor measuring the displacement of the piston 38 of the motor cylinder 36 and a sensor measuring the pressure in the two chambers 42 and 44 of this cylinder.
  • the regulator 56 compares the signals delivered by the sensors 58 to control signals emitted by an electronic pulse generator 60, the latter signals being representative of the shape of the pulse train to be obtained, in order to control the opening and the closing the servo valve 52 as desired.
  • the driving cylinder 36 therefore the uncoupling cylinder 18, is excited by pressure waves rich in harmonics, constituted in practice by trains of 'impulses.
  • a pressure sensor 62 sensitive to the pressure prevailing in the chamber 24 of the unblocking cylinder 18 to emit a stop signal when this pressure reaches or exceeds a threshold. determined.
  • the pulse generator 60 comprises a device for measuring the frequency of the pulses, also emitting a stop signal when the frequency exceeds a given threshold. When either or both of the preset pressure and frequency thresholds are reached, the generator 60 sends a signal cutting off the supply to the motor actuator 36. Thus, any untimely bursting or rupture is avoided.
  • This graph presents two maxima corresponding to resonance peaks whose frequencies are designated respectively by f i and f c in FIG. 2.
  • the second resonance peak of the graph in FIG. 2, which corresponds to the natural frequency f c , is a compressible mode in which the liquid 12 contained in the piping 10 behaves like a compressible medium. In this mode, the liquid column is deformable and the pressure varies along the piping.
  • FIG. 3 represents the variations of the natural frequencies f p as a function of the excitation frequency f. More precisely, this figure represents the variations of the natural frequency f i of the incompressible mode and of the natural frequency f c of the compressible mode, as a function of the excitation frequency f.
  • This graph can be obtained experimentally using a spectrum analyzer, by means of which a frequency sweep is carried out, for example from 0 to 15 Hz. A number of spectra is then stored in the memory of the analyzer successive. From the values thus stored, one can know the evolution of the different harmonics of the natural frequencies f i and f c . From the graphs thus found, the eigen frequencies sought are immediately deduced.
  • the resonance frequencies relating to harmonic 1 are the frequencies of points K and L in FIG. 3 and the resonance frequencies relating to harmonic 2 are the frequencies of points M and N.
  • the natural frequency f i of the incompressible mode is comparable to a mass-spring system.
  • This natural frequency f i is therefore given by the relation in which m corresponds to the mass of the moving liquid, k being the stiffness, which depends on both the calibration of the compliant capacity 28 of the device and the elastic characteristics of the liquid 12 such as its volume modulus. Adjusting the setting of the capacity 28 therefore makes it possible to vary the frequency f i of the incompressible mode at will.
  • FIG. 3 This characteristic is also illustrated by FIG. 3 in which three different graphs of the evolution of the frequency f i are represented as a function of the excitation frequency f, these three graphs corresponding to three different values of the compliance X of the capacitance compliant 28. These three values are designated by the references X1, X2 and X3 in FIG. 3.
  • the invention is however not limited to the superposition of harmonic 2 of the resonant frequency of the incompressible mode and harmonic 1 of the resonant frequency of the compressible mode illustrated in FIG. 3.
  • a comparable effect although of more limited effectiveness, would be obtained by adjusting the compliance X of the capacitance 28 in FIG. 1 so that the frequency of the harmonics 1 or 3 of the resonant frequency of the incompressible mode is equal to the frequency of the harmonic 1 of the resonant frequency of the compressible mode.
  • the unclogging device 16 according to the invention is designed to create a train of pulses rich in harmonics.
  • the serial decomposition of Fourier of this train of pulses shows that the importance of the different harmonics varies according to the value of the ratio between the duration I of each pulse and the period T of the train of pulses ( Figure 4).
  • this I / T ratio will preferably be chosen so that the harmonic n of the resonance frequency of the incompressible mode which is superimposed on the harmonic 1 of the resonance frequency of the compressible mode is as preponderant as possible.
  • the I / T ratio is preferably chosen in the range between 0.45 and 0.55 or failing that between 0.12 and 0.22 or 0.78 and 0.88.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Health & Medical Sciences (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Cleaning In General (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Surgical Instruments (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Measuring Fluid Pressure (AREA)
EP88400506A 1987-03-04 1988-03-03 Verfahren und Vorrichtung zur Beseitigung von Verstopfungen durch Fernbedienung in mit Flüssigkeit gefüllten Rohrleitungen Expired - Lifetime EP0287405B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8702933 1987-03-04
FR8702933A FR2611540B1 (fr) 1987-03-04 1987-03-04 Procede et dispositif de debouchage a distance d'une tuyauterie remplie de liquide

Publications (2)

Publication Number Publication Date
EP0287405A1 true EP0287405A1 (de) 1988-10-19
EP0287405B1 EP0287405B1 (de) 1990-10-31

Family

ID=9348593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400506A Expired - Lifetime EP0287405B1 (de) 1987-03-04 1988-03-03 Verfahren und Vorrichtung zur Beseitigung von Verstopfungen durch Fernbedienung in mit Flüssigkeit gefüllten Rohrleitungen

Country Status (8)

Country Link
US (1) US4974617A (de)
EP (1) EP0287405B1 (de)
JP (1) JP2667892B2 (de)
DE (1) DE3860916D1 (de)
ES (1) ES2018347B3 (de)
FI (1) FI85228C (de)
FR (1) FR2611540B1 (de)
WO (1) WO1988006496A1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289838A (en) * 1991-12-27 1994-03-01 The United States Of America As Represented By The United States Department Of Energy Ultrasonic cleaning of interior surfaces
US5267371A (en) * 1992-02-19 1993-12-07 Iona Appliances Inc. Cyclonic back-pack vacuum cleaner
US5674323A (en) * 1993-02-12 1997-10-07 American International, Inc. Method and apparatus for cleaning columns by inducing vibrations in fouling material and the column
US6290778B1 (en) 1998-08-12 2001-09-18 Hudson Technologies, Inc. Method and apparatus for sonic cleaning of heat exchangers
US20040250842A1 (en) * 2003-06-10 2004-12-16 Adams John A. Device and method for cleaning a tube
ITMI20041480A1 (it) 2004-07-22 2004-10-22 Eni Spa Procedimento per ridurre la pressione di riavvio di correnti scelte fra greggi cerosi, emulsioni di acqua in greggio e dispersioni di idrati idrocarburici e metodo per misurare il profilo del diametro interno di una tubazione e la viscosita' istantan
US20080169044A1 (en) 2006-10-20 2008-07-17 Forhealth Technologies, Inc. Automated drug preparation apparatus including syringe loading, preparation and filling
US7900658B2 (en) 2006-10-20 2011-03-08 Fht, Inc. Automated drug preparation apparatus including drug vial handling, venting, cannula positioning functionality
US7814731B2 (en) 2006-10-20 2010-10-19 Forhealth Technologies, Inc. Automated drug preparation apparatus including a bluetooth communications network
GB0916887D0 (en) 2009-09-28 2009-11-11 Wellmack Resources Ltd Improved blockage apparatus and method
US8353869B2 (en) 2010-11-02 2013-01-15 Baxa Corporation Anti-tampering apparatus and method for drug delivery devices
WO2012162230A1 (en) * 2011-05-20 2012-11-29 Impulse Biomedical, Inc. Feeding tube cleaning devices and methods
FI3325183T3 (fi) 2015-07-23 2024-02-08 Renmatix Inc Menetelmä likaavan aineen poistamiseksi paineastiasta
CN106040677B (zh) * 2016-07-03 2018-03-06 曾春盛 油气管道水气横向轴心电磁变频脉冲波除垢装置
DE102021004277A1 (de) 2021-08-21 2023-02-23 Kastriot Merlaku Abflussrohrreiniger

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2351163A (en) * 1943-01-21 1944-06-13 Diamond Power Speciality Boiler cleaner
GB686842A (en) * 1950-01-25 1953-02-04 Airnesco Products Ltd Fluid pressure actuated blast gun primarily for cleaning purposes
DE893595C (de) * 1951-12-29 1953-10-19 Adalbert Besta Verfahren zum Loesen und Entfernen von Ablagerungen und Anlagerungen in Kanaelen und Rohren
CH567887A5 (de) * 1973-05-04 1975-10-15 Pk Byuro Elektrogidravliki An
DE3018872A1 (de) * 1980-05-16 1981-11-26 BHT Hygiene-Technik GmbH, 8000 München Verfahren zum reinigen von gegenstaenden und vorrichtung zur durchfuehrung des verfahrens

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA837971A (en) * 1970-03-31 Karpovich John Cyclic water hammer apparatus and method
US2560728A (en) * 1945-04-21 1951-07-17 Lee Foundation For Nutritional Wave energy apparatus
US4645542A (en) * 1984-04-26 1987-02-24 Anco Engineers, Inc. Method of pressure pulse cleaning the interior of heat exchanger tubes located within a pressure vessel such as a tube bundle heat exchanger, boiler, condenser or the like

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2351163A (en) * 1943-01-21 1944-06-13 Diamond Power Speciality Boiler cleaner
GB686842A (en) * 1950-01-25 1953-02-04 Airnesco Products Ltd Fluid pressure actuated blast gun primarily for cleaning purposes
DE893595C (de) * 1951-12-29 1953-10-19 Adalbert Besta Verfahren zum Loesen und Entfernen von Ablagerungen und Anlagerungen in Kanaelen und Rohren
CH567887A5 (de) * 1973-05-04 1975-10-15 Pk Byuro Elektrogidravliki An
DE3018872A1 (de) * 1980-05-16 1981-11-26 BHT Hygiene-Technik GmbH, 8000 München Verfahren zum reinigen von gegenstaenden und vorrichtung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
DE3860916D1 (de) 1990-12-06
ES2018347B3 (es) 1991-04-01
EP0287405B1 (de) 1990-10-31
FI884963A0 (fi) 1988-10-27
JPH01502566A (ja) 1989-09-07
FI884963A (fi) 1988-10-27
US4974617A (en) 1990-12-04
FR2611540A1 (fr) 1988-09-09
WO1988006496A1 (fr) 1988-09-07
JP2667892B2 (ja) 1997-10-27
FR2611540B1 (fr) 1989-06-23
FI85228B (fi) 1991-12-13
FI85228C (fi) 1992-03-25

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