EP2815816A1 - Procédé et dispositif d'optimisation du nettoyage de conduites ou d'installations traversées par du liquide - Google Patents
Procédé et dispositif d'optimisation du nettoyage de conduites ou d'installations traversées par du liquide Download PDFInfo
- Publication number
- EP2815816A1 EP2815816A1 EP13003149.5A EP13003149A EP2815816A1 EP 2815816 A1 EP2815816 A1 EP 2815816A1 EP 13003149 A EP13003149 A EP 13003149A EP 2815816 A1 EP2815816 A1 EP 2815816A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- pulse
- flushing
- line
- sequence
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000007788 liquid Substances 0.000 title claims abstract description 32
- 238000004140 cleaning Methods 0.000 title claims abstract description 30
- 238000009434 installation Methods 0.000 title claims description 6
- 238000011010 flushing procedure Methods 0.000 claims abstract description 85
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 230000036961 partial effect Effects 0.000 claims abstract description 12
- 238000010926 purge Methods 0.000 claims abstract description 10
- 230000016507 interphase Effects 0.000 claims abstract description 4
- 230000009467 reduction Effects 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims description 6
- 230000006978 adaptation Effects 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 claims description 4
- 238000012876 topography Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 33
- 239000007789 gas Substances 0.000 description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 239000003651 drinking water Substances 0.000 description 4
- 235000020188 drinking water Nutrition 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000003797 telogen phase Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011086 high cleaning Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
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
- B08B9/032—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
Definitions
- the present invention relates to a method and a device for optimizing the cleaning of liquid-flow lines or installations along a flushing path.
- the cleaning takes place via a pulsating compressed air supply into the rinsing liquid, wherein the pressure surges of the rinsing liquid take place either simultaneously or alternately with the pressure surges of the compressed air.
- the DE 350 29 69 A1 describes a method for cleaning pipelines by means of simultaneously introduced pulses of a liquid and a gas, wherein mix these pulses into total pulses that intermittently enforce the pipeline.
- the pulse of the liquid or the pulse of the gas is decomposed into a plurality of individual pulses, whereby the effect of the cleaning is to be increased.
- For loosening, loosening and flushing of stuck in the pipeline solids occurs the introduction of water and air in the form of rectangular, successive pulses, with the water and the air mix together and prevail as a total pulses the pipe to its open end ,
- the impulses of the air consist of several individual impulses of the same distances, the same amplitude and the same length.
- an abrasive agent is additionally used in which it is passed through a pipe to be cleaned with at least one liquid and one gaseous fluid (cf. EP 06 34 229 A1 ).
- a similar procedure is also in the US 2005/0137104 A1 described.
- the inventive method optimizes the cleaning of liquid-flow lines or systems along a flushing path by the pressure differences at the feed and Ausspeisestelle be minimized.
- the pipes are pipelines, such as water pipes or spurs in water supply systems.
- Such lines may, for example, be part of the water supply network of a domestic installation or of the public supply network his.
- the method according to the invention is also applicable to lines and systems of the beverage industry, food industry or pharmaceutical industry as well as sections of waste water pressure lines.
- the method is also suitable for the purification of complex installations, which have liquid-flow line sections, such as a heat exchanger device, pump or air mixer.
- the measurement and detection of the pressure curves at the beginning of the flushing section and at the end of the flushing section are preferably carried out via pressure sensors. It can also be distributed along the flushing several pressure sensors. According to the invention, it has now been found that an optimization of the cleaning of lines or systems through which liquid flows can be effected by passing several sequences with pulses into the line or system, wherein a pause phase is introduced between the sequences in the pulse phase.
- sequence pulse count n x pulse duration DIM + pulse interval INT .
- the number of pulses (n) corresponds to the number of pulses in the sequence
- the pulse duration (DIM) of the duration of a pulse in the sequence and the pulse interval (INT) to the time interval between two pulses and at the end of a sequence to the beginning of the subsequent Next sequence
- a pause phase (P) is introduced, in which there is the pressure reduction and partial filling in the flushing path.
- the height of the individual parameters essentially depends on the line geometry and the topography.
- the method according to the invention makes it possible to carry out the adaptation required for the optimization on the basis of the determined and transmitted measured values quickly and efficiently.
- the number of pulses (n) > 1.
- the number of pulses (n) has, for example, a value between 1 and 3, preferably between 2 and 5.
- the pressure curve can be varied to the end of the purge path and thus optimized.
- a further adaptation can take place via the volume flow of the rinsing liquid or the gas pressure at the control unit.
- the volume flow of the rinsing liquid can be controlled via the inflow rate of the water as a function of the throttling of the shut-off valve before the air feed and the pipe network pressure.
- the length of the individual parameters also depends on the line topography.
- the length of the pause phase (P) between two sequences in a system with nominal diameters of 50 to 75 m is between 30 seconds and 50 seconds.
- the pause phase (P) is at least 30 seconds long. In certain piping systems, pause lengths of more than 50 seconds may also be required.
- the duration (t) of a single sequence is between 35 and 80 seconds, preferably more than 30 seconds.
- the duration (t) is between 50 and 90 seconds, preferably more than 70 seconds.
- the pulse duration for maintaining the pressure at the end of the flushing for example, between 1 and 10 seconds.
- a pulse duration in such a system is between 4 and 8 seconds, more preferably between 2 and 4 seconds.
- the pulse interval in the pilot plant is preferably between 2 and 18 seconds, more preferably between 10 and 13 seconds.
- the liquid pressure in the line or plant before the flushing path is preferably set in the pilot plant between 3 and 7 bar, preferably at 6 bar. The exact numerical values in practice may vary depending on the length and type of flushing distance and deviate from these values. It is preferred that the fluid pressure in the line or system is adjusted before the flushing section below the mains rest or operating pressure. The pulse duration and the pulse interval should be kept as low as possible.
- the exact height of the parameters to be set depends on the line to be cleaned, in particular the line internal diameter, the length of the flushing path, the number of branches and the geometry of the line system.
- the partial emptying of the previously filled line section described in the run-in phase follows after the rest phase in which the flushing section is filled with liquid or becomes.
- the partial emptying in the run-in phase is carried out by introducing a gas or a gas mixture in the line section, whereby the water is displaced due to the volume expansion of the gas.
- By running back of liquid in the sole of the line section remains at the feed in particular a residual amount of liquid.
- a residual amount of liquid Preferably, about 10 to 35% of the liquid remain in the flushing section. It is essential that the line must not "run dry" to ensure the desired cleaning success, in particular the maintenance of the pressure curve at the end of the flushing path.
- a partial filling of the flushing path takes place.
- the partial emptying of the line section in the run-in phase and the partial filling of the line section in the pause phase are an essential part of the method for optimizing the pressure curve at the end of the flushing path and the associated increase in the cleaning performance of lines or piping systems.
- the liquid-filled line section may be the existing pipe network of a drinking water line. This provides the required hydration. Alternatively, an external introduction of liquid is possible.
- the device preferably also comprises a device for regulating the volume flow of the liquid to be introduced into the line or system. This may be, for example, a slide or a valve. The control of the volume flow of the water allows faster block formation of water blocks as well as absorption and transmission of energy.
- the pressures are recorded via the pressure sensors at the entry point and at the end of the flushing section.
- a relatively high resolution of the pressure peaks is possible.
- a fast feedback takes place so that the difference between the corresponding pressure peaks is kept as low as possible.
- an assignment table is preferably provided with which, for example, the pulse duration, the pulse interval, the fluid pressure in the line or system, the pulse number and the length of the pause phase are detected and adjusted directly on the basis of the determined pressure values.
- the device according to the invention comprises means for detecting the pump pressure or the pipe network pressure, the gas pressure at the feed point and the volume flow of the inflowing liquid.
- a plurality of pressure sensors may be arranged along the flushing path in order to detect the pressure profile almost completely.
- the pressure sensors can either be mounted directly on a standpipe or an additionally installed T-piece. They measure the pressure profile at the feed point for the gas or gas mixture and at the exit point for the air and water blocks.
- the data is detected at a distance of about 0.1 seconds.
- the data is then transferred to an evaluation unit.
- the data transmission can be wired or wireless.
- the pressure values recorded via the pressure sensors form the basis for the regulation and control unit, which adapts the individual parameters described above so that the pressure difference at the pressure sensor at the end of the flushing path to the pressure sensor at the entry point at the beginning of the flushing path is as low as possible.
- said line or investment parameters can be stored in a storage unit in the control and control unit.
- predefined values for the pulse duration, the pulse interval, the fluid pressure in the line or system, the pulse number and the length of the pause phase can be stored as a function of the line geometry and the length of the purging path.
- the pressure curves in the individual phases, the rest phase, the retraction phase and the pulse phase were measured.
- the pipe section In the rest phase, the pipe section is completely filled with water, the flow rate is 0.3 or 0.5 m / s. Gas is supplied with 5 bar air pressure in the line. Volume flow and water pressure are constant.
- the partial flushing of the flushing section takes place by means of pulsed compressed air. The exact length of the retraction phase depends on the length of the rinse lines.
- Fig. 1 A The results of the pilot plant with DN80 are in Fig. 1 A shown.
- the pressure curves are shown on two sensors: at the beginning of the rinse line (thin line) and at the end of the rinse line (thick line), with impulse cleaning not optimized. It can be clearly seen how it comes to a pressure drop to the end of the flushing distance at the last pressure sensor. The pressure peaks almost completely flat at the exit point of the flushing section.
- a pressure difference of slightly more than 3 bar was determined with water rinsing (without air) and a flow velocity of 3.7 m / s.
- the pressure at the exit during the break-in period was for a short time more than 80% of the maximum pressure at the entry point during the impulse phase, but not even 20% of the maximum pressure at the entry point was reached.
- the cleaning process could be optimized. This was accompanied by the lowest possible pressure loss between the pressure sensor at the beginning of the flushing section and the pressure sensor at the end of the flushing section. It turned out that in particular the pause phase between two sequences for the printer stop at the end of the flushing plays an essential role. In the pause phase it comes to pressure reduction in the flushing and to the backflow of water in the pipe for the likewise required partial emptying. The liquid residue collected in the run-in phase in the line is required for the next sequence.
- Fig. 1 B The results of the optimized method are in Fig. 1 B shown. It is clearly recognizable how the pressure at the end of the flushing line (thick line) is maintained in comparison to the pressure curve at the beginning of the flushing line (thin line) ( Fig. 1 A) , The difference of the pressure peaks at the end of the flushing path compared to the pressure at the beginning of the flushing path is kept as low as possible.
- a sequence consists in the example shown of three individual pulses, which can be seen in the diagram as three pulse peaks.
- the length of a pulse defines the pulse duration (DIM).
- the distance between the end of a pulse and the beginning of the subsequent pulse in the sequence defines the pulse interval (INT).
- An additional change in the throttling of the water supply through a shut-off valve can lead to a further improvement of the cleaning performance.
- the gas pressure is adjusted so that the static pressure of the pipeline network is not exceeded.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13003149.5A EP2815816B1 (fr) | 2013-06-20 | 2013-06-20 | Procédé d'optimisation du nettoyage de conduites ou d'installations traversées par du liquide |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13003149.5A EP2815816B1 (fr) | 2013-06-20 | 2013-06-20 | Procédé d'optimisation du nettoyage de conduites ou d'installations traversées par du liquide |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2815816A1 true EP2815816A1 (fr) | 2014-12-24 |
EP2815816B1 EP2815816B1 (fr) | 2017-08-02 |
Family
ID=48745588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13003149.5A Active EP2815816B1 (fr) | 2013-06-20 | 2013-06-20 | Procédé d'optimisation du nettoyage de conduites ou d'installations traversées par du liquide |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP2815816B1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109186319A (zh) * | 2018-10-11 | 2019-01-11 | 华电能源股份有限公司佳木斯热电厂 | 一种水气脉冲清洗设备及清洗方法 |
EP3782742A1 (fr) | 2019-08-23 | 2021-02-24 | wattec GmbH | Dispositif de nettoyage et procédé de nettoyage |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4186602B1 (fr) | 2021-11-29 | 2024-03-27 | Hammann Engineering GmbH | Procédé et dispositif de nettoyage des conduites ou des systèmes au moyen des impulsions de gaz comprimé modulant |
Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE673368C (de) | 1935-09-14 | 1939-03-21 | Friedrich Von Heinrich Dr Ing | Vorrichtung zum Trocknen von bedruckten Papierbogen, insbesondere Kupferdrucken |
DE3502969A1 (de) | 1985-01-30 | 1986-07-31 | Alfred Dr.-Ing. 7500 Karlsruhe Kuch | Verfahren und vorrichtung zur reinigung einer rohrleitung |
DE3722549A1 (de) | 1986-07-28 | 1988-02-04 | Fischer Ag Georg | Einrichtung zur spuelung und reinigung einer rohrleitung |
FR2602571A1 (fr) | 1986-08-06 | 1988-02-12 | Assainissement Rationnel Pompa | Procede de nettoyage d'une conduite notamment d'un reseau de distribution d'eau potable et systeme pour la mise en oeuvre de ce procede |
EP0634229A1 (fr) | 1993-07-12 | 1995-01-18 | Promotec AG | Procédé, assemblage et dispositif pour le nettoyage et revêtement interne d'une tuyauterie |
DE4438939C2 (de) | 1994-10-31 | 1997-02-13 | Kanal Sanierung Halle Gmbh | Verfahren und Einrichtung zum Reinigen von Trinkwasserleitungen und zum Spülen von Trinkwasserleitungsnetzen |
DE10204737A1 (de) | 2002-02-06 | 2003-08-21 | Eam Wasserversorgung Gmbh | Verfahren und Vorrichtung zum Spülen und Reinigen einer Rohrleitung, insbesondere einer Trinkwasserleitung |
US20050137104A1 (en) | 2003-12-22 | 2005-06-23 | Jeffrey Maxwell | Method and composition for cleaning a fluid delivery system |
US20050150526A1 (en) | 2002-09-19 | 2005-07-14 | Tsuyoshi Matsushita | Washing equipment |
EP1027175B1 (fr) | 1997-06-23 | 2007-05-16 | Princeton Trade and Technology, Inc. | Procede de nettoyage permettant d'eliminer un film biologique et des debris dans des conduits et des tubes |
US20080210262A1 (en) | 2004-04-16 | 2008-09-04 | Normand Lauzon | Cleaning Method and Apparatus |
DE102008056623B3 (de) | 2008-11-10 | 2010-02-11 | Autoliv Development Ab | Aufpralldetektionssystem mit kalibrierbarer Entscheidungslogik |
DE102008048710A1 (de) | 2008-09-24 | 2010-03-25 | Hammann Wasser-Kommunal Ingenieurgesellschaft für kommunale Dienstleistungen mbH | Verfahren und Vorrichtung zur Entfernung von Biofilmen und Ablagerungen aus Tränkwassersystemen für Tierhaltungen |
DE102008056522A1 (de) | 2008-11-08 | 2010-05-12 | Hammann Wasser-Kommunal Ingenieurgesellschaft für kommunale Dienstleistungen mbH | Stationäre Vorrichtung und Verfahren zur Reinigung von Rohrleitungen in Gebäuden während Stagnationszeiten |
GB2473964A (en) * | 2009-09-28 | 2011-03-30 | Paradigm Flow Solutions Ltd | Method and apparatus for removing a blockage from a fluid conduit |
DE102010013167A1 (de) | 2010-03-27 | 2011-09-29 | Hammann Gmbh | Verfahren und Vorrichtung zur Entfernung von Ablagerungen und/oder Biofilmen in Wasser- oder Produktleitungen oder Rohrleitungssystemen |
-
2013
- 2013-06-20 EP EP13003149.5A patent/EP2815816B1/fr active Active
Patent Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE673368C (de) | 1935-09-14 | 1939-03-21 | Friedrich Von Heinrich Dr Ing | Vorrichtung zum Trocknen von bedruckten Papierbogen, insbesondere Kupferdrucken |
DE3502969A1 (de) | 1985-01-30 | 1986-07-31 | Alfred Dr.-Ing. 7500 Karlsruhe Kuch | Verfahren und vorrichtung zur reinigung einer rohrleitung |
DE3722549A1 (de) | 1986-07-28 | 1988-02-04 | Fischer Ag Georg | Einrichtung zur spuelung und reinigung einer rohrleitung |
FR2602571A1 (fr) | 1986-08-06 | 1988-02-12 | Assainissement Rationnel Pompa | Procede de nettoyage d'une conduite notamment d'un reseau de distribution d'eau potable et systeme pour la mise en oeuvre de ce procede |
EP0634229A1 (fr) | 1993-07-12 | 1995-01-18 | Promotec AG | Procédé, assemblage et dispositif pour le nettoyage et revêtement interne d'une tuyauterie |
DE4438939C2 (de) | 1994-10-31 | 1997-02-13 | Kanal Sanierung Halle Gmbh | Verfahren und Einrichtung zum Reinigen von Trinkwasserleitungen und zum Spülen von Trinkwasserleitungsnetzen |
EP1027175B1 (fr) | 1997-06-23 | 2007-05-16 | Princeton Trade and Technology, Inc. | Procede de nettoyage permettant d'eliminer un film biologique et des debris dans des conduits et des tubes |
DE10204737A1 (de) | 2002-02-06 | 2003-08-21 | Eam Wasserversorgung Gmbh | Verfahren und Vorrichtung zum Spülen und Reinigen einer Rohrleitung, insbesondere einer Trinkwasserleitung |
US20050150526A1 (en) | 2002-09-19 | 2005-07-14 | Tsuyoshi Matsushita | Washing equipment |
US20050137104A1 (en) | 2003-12-22 | 2005-06-23 | Jeffrey Maxwell | Method and composition for cleaning a fluid delivery system |
US20080210262A1 (en) | 2004-04-16 | 2008-09-04 | Normand Lauzon | Cleaning Method and Apparatus |
DE102008048710A1 (de) | 2008-09-24 | 2010-03-25 | Hammann Wasser-Kommunal Ingenieurgesellschaft für kommunale Dienstleistungen mbH | Verfahren und Vorrichtung zur Entfernung von Biofilmen und Ablagerungen aus Tränkwassersystemen für Tierhaltungen |
DE102008056522A1 (de) | 2008-11-08 | 2010-05-12 | Hammann Wasser-Kommunal Ingenieurgesellschaft für kommunale Dienstleistungen mbH | Stationäre Vorrichtung und Verfahren zur Reinigung von Rohrleitungen in Gebäuden während Stagnationszeiten |
DE102008056623B3 (de) | 2008-11-10 | 2010-02-11 | Autoliv Development Ab | Aufpralldetektionssystem mit kalibrierbarer Entscheidungslogik |
GB2473964A (en) * | 2009-09-28 | 2011-03-30 | Paradigm Flow Solutions Ltd | Method and apparatus for removing a blockage from a fluid conduit |
DE102010013167A1 (de) | 2010-03-27 | 2011-09-29 | Hammann Gmbh | Verfahren und Vorrichtung zur Entfernung von Ablagerungen und/oder Biofilmen in Wasser- oder Produktleitungen oder Rohrleitungssystemen |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109186319A (zh) * | 2018-10-11 | 2019-01-11 | 华电能源股份有限公司佳木斯热电厂 | 一种水气脉冲清洗设备及清洗方法 |
EP3782742A1 (fr) | 2019-08-23 | 2021-02-24 | wattec GmbH | Dispositif de nettoyage et procédé de nettoyage |
Also Published As
Publication number | Publication date |
---|---|
EP2815816B1 (fr) | 2017-08-02 |
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