EP0634229B1 - Method, assembly and apparatus for internal cleaning and coating of pipelines - Google Patents

Abstract

The method for cleaning pipes, in particular installed pipelines (49, 31) envisages that an abrasive medium is passed through a pipe to be cleaned with at least one liquid and one gaseous fluid. The gaseous fluid is in this case present in excess. The acceleration of the mixture can take place by high and/or low pressure. As a result of the use of a liquid, a more protective cleaning can be achieved in contrast to known dry methods. The cleaned pipe is blown dry and subsequently coated with a plastic. The coating takes place by sucking in a synthetic resin plug. <IMAGE>

Description

The present invention relates to a method and a device for Interior cleaning and renovation of pipes, especially installed ones Pipelines, by means of a fluid and a jet or Abrasive. Such treatment of pipes is in principle from GB-A-1 236 205 known (see preamble of claims 1 and 18).

Methods are known with which installed Pipelines with a mixture of compressed air and abrasive getting cleaned. In a method of the second type, which e.g. in DE-A-3 235 506 is described High speed air jet mixed with an abrasive and sent through the pipe to be cleaned. For one thorough cleaning usually requires an abrasive from great hardness, e.g. Sand. With the big ones Flow rates of approximately 80 m / s due to the force of the grains of sand, however, bends in the pipe often Knock through the deflection point. This effect is believed to be caused by electrostatic charges of the dry sand / air mixture reinforced. The damaged pipe sections must be replaced be what reduces the economics of the process.

A disadvantage with the method described above is that Abrasive at the end of the lines at high speed exit. In order to create a large amount of dust prevent the abrasive in a separate Dedusting system, also because the harmful effects of dust, especially of Quartz dust, is known. Another disadvantage of the process according to DE-A-3 235 506 is that the cleaning effect in generally gets worse the longer the pipeline is. This is due to the fact that the grains of sand after one certain route less and less often to the pipe walls bounce and also their impulse directed at the pipe walls presumably decreases. A characteristic of the known Sandblasting is also that at the Cleaning a branched piping system Abrasives are always added to the smaller pipe diameter and must be eliminated in the case of the larger pipe diameter, because in the opposite case there would be a risk of constipation. This procedure inevitably shows that the Main pipes of larger diameter several times and excessively to be cleaned, causing undesirable pipe bends Material removal can come.

Furthermore, from DE-A-41 19 947 a method is known for which at the same time water, compressed air and a granular Granules or the like at intervals in the water pipe be introduced and narrowed by the deposit Water pipes are pressed. This procedure indicates the Disadvantage that the supply of the abrasive is not can be dosed, which is why at the water outlet point attention must be paid to whether there is a blockage in the water pipe takes place. There is no recovery of the abrasive possible because it is supplied dry, but wet Another disadvantage of the proposed The procedure is that they are the existing House connection used and thus to the existing Line pressure and the given flow direction is, causing neither a reversal of the flow direction cleaning in sections is still possible. Is too questionable whether the existing line pressure in all cases can suffice.

The invention aims at a cleaning method and a To propose cleaning composition by the beginning mentioned disadvantages can be largely avoided. The The procedure should be easier to use than that known methods. In addition, a device for Implementation of the process in a simple and inexpensive manner Be acquisition.

According to the invention this is achieved in that first Pipe system is filled with liquid, then the abrasive is wetted with the liquid fluid and then dosed into a mixing tube (21) or pressed where the liquid / abrasive mixture through a gaseous Fluid is swirled and accelerated and where the mixture if necessary, further liquid is supplied, and that in each case with this mixture the piping system between two Sections or sections cleaned becomes. The particular advantage of the method according to the invention compared to the prior art is that the abrasive Effect weakened by the addition of a liquid fluid can be. In practice, this is reflected in the fact that penetration of pipe bends largely prevented can be. The beneficial effect of the liquid additive can be explained with the fact that the liquid quasi as "Braking agent" for the abrasive grains works and therefore one allows more gentle cleaning of pipes. On the other hand, the cleaning effect can be increased by a larger one The proportion of abrasive grains with a larger diameter is increased will. It is also advantageous that the tubes in any Direction, as well as sector resp. cleaned in sections can be. This means that "defined" pipe sections can be cleaned with a similar diameter and thus a uniform cleaning effect is achieved. This is the risk of undesired material removal or Pipe penetration largely eliminated. Another advantage The inventive method is that, in contrast to known prior art no more dedusting system is because no dust is generated. The procedure can be used Cleaning of pipes of any kind can be applied especially of installed pipes for liquids or Gases, their cleaning with other methods because of bad Accessibility is difficult. By appropriate choice of Liquid and gas can also be used for pipes in which flammable media is transported will. The procedure is suitable due to the gentle Cleaning especially for pipes made of softer or sensitive materials, such as copper or plastic pipes. Finally, the process compared to the known Dry processes also have the advantage of being cleaned Pipes no longer need to be dried beforehand.

It is advantageous to use the abrasive and the liquid fluid swirl by means of the gaseous fluid and with a Speed> about 1m / s through the pipe. The speed of the gaseous fluid can be around be quite a bit higher than that of the abrasive / liquid mixture.

The abrasive, the liquid and the gaseous fluid are advantageously applied under approximately the same pressure, which is between 2.0265 and 12.159 x10 ⁵ Pa (2 and 12 bar), preferably between 4.053 and 8.106 x10 ⁵ Pa (4 and 8 bar). As a result, the abrasive can be accelerated to a speed at which it causes the desired abrasive effect. The effect depends essentially on the type and possibly the composition of the abrasive, the amount of liquid and the speed of the abrasive. For example, an air compressor can be used to generate an excess pressure. The high pressure water required can be branched off directly from a high pressure water connection. The abrasive, the liquid and the gaseous fluid can also be conveyed through the pipe by applying an overpressure and / or a vacuum.

The pressure is expediently applied intermittently. This can increase the abrasive effect of the abrasive will. The pressure is advantageously set so that the Mixture of abrasive, liquid and gaseous Fluid pulsates in the tube. This also has an improvement the grinding effect. It is appropriate that Direction of the mixture during the cleaning process to reverse at least once. This also allows the pipe to Places to be cleaned in a certain direction lie in a blind spot. In contrast, can the drying process mentioned in the introduction the direction of rotation not be reversed because when cleaning in the direction of Block the pipes from larger to smaller diameters.

The abrasive used and / or the Liquid circulated and used several times. Thereby may the disposal costs incurred for a Contaminated abrasive / liquid mixture low being held.

It is advisable to clean the pipe after cleaning Blow dry and then with a plastic coat. The coating is advantageously done by Suction of a resin plug using a vacuum. As a result, the other connection points only need can be closed without having to do this like when coating is the case by means of an overprint, for the rest Line system can also be set an overpressure should. If this was not the case with the latter procedure, the resin plug would become uncontrolled in Spread the pipe system. It is advantageous to have the cleaned To provide the pipe with a second plastic layer after the first layer is at least partially polymerized is. This enables particularly durable coatings getting produced. In addition, there is less of a risk that certain areas are not coated. Will the applied layers also colored differently, then can be a control at a later date relatively easily of the inner surfaces of the pipes.

A device for performing the method has one Container for holding an abrasive, one a Dosing device or a mixing tube having a dosing valve, which connects the container to a pipe to be cleaned, and at least one feed line and / or Connection point on the container and / or on the mixing tube Feed in at least one gaseous and one liquid Fluids, and means for generating a super and / or Vacuum to the abrasive with the liquid and the swirl and accelerate gaseous fluid. This Device is inexpensive and only requires a small one Space requirements.

A separator is expediently provided, which via a first, a pump line with the Supply lines, respectively. Connection points for the liquid Fluid, and via a second valve-provided line communicates with the pressure vessel. This has the Advantage that the liquid fluid used and Abrasive can be used several times.

A suitable cleaning composition for Internal cleaning of pipes, especially of installed ones Piping includes 1 volume of abrasive, 1 to 12 Parts by volume, preferably 3 to 7 parts by volume of a liquid and 80 to 3000 parts by volume, preferably 600 to 1,200 Parts by volume of a gaseous fluid (at normal pressure), where the mixture of abrasive, liquid and gaseous fluid by applying an overpressure and / or a vacuum a pipe to be cleaned is sent. This composition is particularly effective and allows gentle cleaning of Pipes. By cleaning with this wet or damp The mixture is neither predrying nor vacuuming at the end of the pipe required. The mixture filling the pipe ensures uniform all-round cleaning without the risk of Penetration of pipe bends. Damage is also caused by static charges avoided.

The liquid fluid water and the gaseous one are advantageous Fluid air. It is also advantageous if the abrasive is a mixture of different grain sizes. It has namely shown that the cleaning effect is the better, ever is larger than the grain diameter. A mix of different Grain sizes has the advantage of having a good cleaning effect can be achieved with little risk of constipation. In this Context should not go unmentioned that use of grain sizes of e.g. 6 mm in the conventional and dry cleaning methods mentioned at the beginning would be unthinkable, since such grain sizes inevitably damage the Would lead pipes.

It is expedient to add an inhibitor and / or to the mixture Add cleaning additives. It can also be a Binders are added so that a paste is formed, that can be pushed through the pipes.

Fig.1

eine vereinfachte, schematische Darstellung der erfindungsgemässen Vorrichtung,

Fig.2

eine typische Installation zur Reinigung eines Rohrsystems, z.B. eines Mehrfamilienhauses, mit einer Vorrichtung mit Fluid- und Abrasivmittelrückführung.

Exemplary embodiments of the invention are described below with reference to the figures. It shows:

Fig. 1

a simplified, schematic representation of the device according to the invention,

Fig. 2

a typical installation for cleaning a pipe system, e.g. an apartment building, with a device with fluid and abrasive return.

A device 11 for performing the inventive 1 has a pressure vessel 13 for Inclusion of an abrasive 15, lines 17, 19, 20 for Supply of a liquid and a gaseous fluid in the Pressure vessel 13 and in a mixing tube 21 which the Pressure vessel 13 and a pipe 23 to be cleaned connects, as well as pressure medium, e.g. an air compressor 25, for generation an overpressure. The cleaning effect in the deposits having tube 23 is achieved in that a Abrasive 15 and a liquid fluid with the gaseous Fluid swirls, accelerates and is sent through tube 23 becomes. It goes without saying that the gaseous and the liquid fluid is at approximately the same pressure need to prevent the two fluids used to displace each other.

In the exemplary embodiment according to FIG. 1, line 17 the gaseous fluid, and through the lines 19, 20 the liquid fluid supplied. The liquid fluid, e.g. Water from a high pressure water connection is already under pressure and can be shut off by valve 27. A Pressure reducer 29 allows the setting of a certain one Pressure. A portion of the liquid Fluids, usually water, are fed into the mixing tube 21, the rest is through line 20 in the lower part of the Container 13 passed. The water led into the container 13 has the purpose of wetting the abrasive, so that it from the container 13 can be rinsed. In line 20 can another high pressure pump (not shown) is provided be.

The line 17 through which a compressed gas in the Usually air that is supplied is at the outlet of the container 13 the mixing tube 21 connected. The line 17 has a Shut-off valve 16 and a pressure regulator 18. The Abrasive 15 can by an adjustable valve 32 or a flap can be passed into the mixing tube 21. Will that Valve 32 opened, so arises in pressure vessel 13 practically instantaneously the same pressure as in the mixing tube 21 a.

By supplying a pressurized one liquid fluid in the pressure vessel 13, that gets Abrasive 15 and the liquid with valve 32 open into the mixing tube 21, where it passes through the gaseous fluid is swirled and accelerated. This mixture can be used over the Line 19 further liquid are added. Thereby creates a mixture of these components, which, on one certain speed accelerates, deposits in one Can effectively remove pipe. Compared to the state of the art has the use of this damp or wet mixture Advantage that cleaning can be done more gently, no Predrying the tubes is required and none Dedusting system is necessary. The one coming out of the pipe Mixture with the removed impurities can go directly into the sewer, in a separate container collected or used again. As another It turned out to be a considerable advantage that the removed dirt and rust usually on the water floats on top and thus separates well with the water leaves. The abrasive can consequently, without it becoming a noticeable impairment of its effect be used multiple times. The water used can can also be recycled when the solid components be separated.

Fig.2 shows a typical installation for cleaning an over pipeline system 31 extending over several floors of an apartment building. The device of Fig.2 differs from that of Fig.1 essentially only in that means are provided to the abrasive and to use the water used several times. For simplification the presentation is therefore, as far as possible and expedient, the same reference numbers are used in FIG. 2 as in FIG. 1.

In contrast to Fig.1 is one in the embodiment 2 a separator 33, e.g. a Cyclone separator, provided, in which the from the Pipe system 31 with emerging cleaning composition the contaminants. The separator 33 stands via a valve 35 or a slide with the pressure container 13 in connection. Through the valve 35, the remote Abrasive can be drained back into the pressure vessel 13. A line 37 also allows the excess water of the To pass separator 33 into a water tank 39. Of the Water tank 39 mainly has a storage function, can however be used as a further separator. From Water tank 39 can the water via a line 41 and a Pump 43 can be fed back into lines 19, 20. Of the Water tank 39 has a drain valve 45 on the bottom, which Can serve cleaning purposes or the supply of water.

The piping system 31 to be cleaned has a large number of water connection points 47, which are located on different Floors. The piping various Floors are interconnected by a main line 49 connected. The cleaning device 11 'is by means of Flow lines 22 and return lines 51 to the Water connection points 47 connected. The supply lines 22 serve to supply the cleaning composition, and the return lines 51 of the return of the Cleaning composition in the container 33. It has proven to be Proven to be useful at adjacent water connection points 47 alternately flow lines 22 and return lines 51 to be connected. This has the advantage that Pipe system 31 can be cleaned in sections.

At the end of the mixing tube 21, a distributor battery 53 intended. There are a large number of this distributor battery 53 of supply lines 22, advantageously in blocks, can be connected. A connection battery (not shown) to which the return lines are provided 51 can be connected in blocks. With this design you can the supply lines 22 and return lines 51 each quickly either on the separator 33 or on the distributor battery 53 be connected. This allows the running direction of the Quickly turn the cleaning composition over by turning the Connection flanges can be changed. The pre and Return lines 22, 51 point to their respective Shut-off valves 55 on the water connection-side ends.

To put it simply, the cleaning process can be used as follows: In the pressure vessel 13, an abrasive such as quartz sand is filled with water in a suitable ratio. The mixing tube 21, which is connected to the pressure vessel 13 and a compressed air line 17, is located under the boiler. The output side of the mixing tube 21 is connected to a pressure jet hose or flow line 22 and the line pipe 23 to be cleaned or inserted into the line pipe. The pressure (e.g. about 5,573 x10 ⁵ Pa or 5 bar) is set. Dosed, it is then pressed into the mixing tube 21 or. drained and pressurized with compressed air (e.g. 4,053 x10 ⁵ Pa or 4 bar). The mixture is carried away and hurled through the conduit. At the end of the line, it can exit directly in a separator container to recover the blasting media. Suction at the end of the line is not necessary.

With this method, the conveying direction can then be switched on or off reversed several times to make blind spots, e.g. Pipe fittings, to reach in both directions, because a jamming of the Sandes at the transition to smaller pipe cross sections through the Water as a means of transport is avoided.

For the renovation of a pipeline system in an apartment building The procedure is as follows: First, all Fittings removed from the piping system 31 to be cleaned. Thereafter, each of the water connections 47, as in FIG shown, the supply lines 22 and return lines alternating 51 connected. The water tank 39 is with Filled with water (e.g. 400 liters). Then the whole thing Pipe system 31 filled with water. As soon as this happens is, all valves 55 are closed. The pressure vessel 13 is washed with about 50 liters of an abrasive, e.g. one granular corundum, filled. The corundum is advantageous Mixture of different grain sizes, in this example the maximum grain size is approximately 3 to 4 mm (diameter of the piping system: between 3/8 "and 5/4"). For bigger ones Pipe diameter can correspond to at least some of the grains have larger grain diameters.

For cleaning, two adjacent shut-off valves 55 are now opened and the pipe section between the two water connections is first appropriately rinsed with water (approx. 50 l / min, 5.5729 - 6.0795 x 10 ⁵ Pa or 5 - 6 bar). The next step is to convey the abrasive with compressed air and water through the pipe section to be cleaned. Approx. 8 - 10 Nm ³ (normal cubic meters) of air are blown into the mixing tube 21 under a pressure of approximately 6.0795 - 8.106 x10 ⁵ Pa (6 to 8 bar) per minute. About 3 liters of water per minute (5.5729 - 8.103 x10 ⁵ Pa or 5.5 to 8 bar) are added to the abrasive in the pressure vessel 13 via line 20. After valve 32, high pressure water (30 to 80 l / min; 5.5729 - 8.103 x10 ⁵ Pa or 5.5 to 8 bar) is added to the abrasive / water / air mixture. The abrasive / water mixture is advantageously accelerated to a speed of approximately 1 to 10 m / s by the compressed air. The air used flows through the pipe at a speed between approximately 30 and 100 m / s. In a specific case (pipe 3/8 "to 5/4") speeds of approx. 3 m / s for the abrasive and the liquid, and approx. 60 m / s for the air were calculated.

A particularly efficient cleaning effect can be achieved be when a pulsating in the supply lines 22 or vibrating flow. This "pulsation" can achieved by varying the air pressure and / or water pressure will. Alternatively, this pulsation can also be caused by the Pump 43 are amplified. The pump 43 can e.g. a compressed air powered Water high pressure pump. The cleaning of the Pipe section with the abrasive takes about 5 minutes. Then the supply and return lines 22 and 51 exchanged, i.e. the flow lines 22 are on the separator 33 and the return lines 51 connected to the valve manifold 53, so the direction of the cleaning composition is just the opposite. The process described above is repeated for all pipe sections until the whole pipe system 31 is cleaned.

For cables with a larger diameter, the Flow line or delivery hose with a special Nozzle head and inserted into the pipes. The nozzle outlet openings are advantageously to the rear (with regard to the direction of conveyance), which is all-round Centrifuging the mixture under pressure against the pipe walls and at the same time promotes the forward movement of the hose. The Mixing ratio water / abrasive can be the pipe diameter and the degree of incrustation from "wet blasting" to "Wet rays" can be adjusted so that an optimal and gentle interior cleaning is achieved.

After the cleaning process, the system is thoroughly cleaned Fresh water rinsed. The rinse water can be a Passivation agent can be added, which is the preparation of Flash rust on the bare metal inner surfaces during prevent the drying process. A suitable alkaline passivating agent is e.g. the product 31.00 the Company CM, CH-5612 Villmergen. The rinse water can also be heated to speed up the subsequent drying process.

After rinsing / passivation, the piping system preferably dried with preheated air and the lines are warmed up to a temperature of 20 to 40 ° C. The Heated air can come from an air manifold at the same time all water connections are distributed and the air outlet through the line 49 take place. The drying process takes approx. 30 up to 60 minutes.

For the subsequent inner coating, the required amount of a synthetic resin, preferably an epoxy resin, is allocated to each pipe section (approx. 80 g per running meter of a 1/2 "pipe) the water connection is installed, blown into the pipes by means of compressed air. The pressure and the amount of air must be adapted to the pipe diameter and the viscosity of the resin (eg overpressure coating: 2,533 x10 ⁵ Pa or 2.5 bar, 5 to 8 Nm ³ , pipe diameter: 3 / 8 "to 5/4").

During coating, all other connections are connected Air builds up a back pressure, preferably with pressure gauges adjusted resp. is set. The setting of the pressure can be done beforehand without resin.

A second coating method is one on the whole Piping system calculated amount of synthetic resin at the most distant water connection and by means of the Blow compressed air to the nearest, closer water connection. The Arrival of the synthetic resin at the next water connection can e.g. through a plugged on the water connection transparent tube can be observed. Once the resin appears, the same is blown back and to the next one Water connection promoted.

A third and very simple coating method is by means of a vacuum pump to suck the coating material. Here the negative pressure is applied to the main line or sucked and the corresponding amount of resin with each water connection Open a valve entered. The advantage of this method consists in the fact that there are no plugs on blind lines etc. can form and no blockages occur. This The method can be advantageous, particularly in the case of ring lines many water connections and outlets can be used.

Depending on your needs, a second one, possibly colored differently Resin layer after the first coating on the top described type can be introduced.

After the coating process (duration approx. 20 to 40 minutes) warm air (with reduced pressure) is blown through as long as until the polymerization process has started.

After approx. 24 hours, water can be poured into the refurbished building Piping system are given.

Claims (21)

1. Method for renovating pipes of a pipeline system having several connecting points wherein to remove deposits an abrasive agent is wetted with a liquid fluid and the fluid/abrasive agent mixture is fluidized through a gaseous fluid and accelerated and passed through the pipeline system which is to be cleaned characterised in that first the pipeline system is filled with fluid, then the wetted abrasive agent is added or forced in dosed amount into a mixer pipe (21) where further fluid is supplied to the mixture and that the pipeline system filled with fluid between two connecting points is cleaned in sectors or sections respectively.
2. Method according to claim 1 characterised in that the abrasive agent/fluid mixture is passed through the pipe or pipes at a rate of approximately 1m/s to 10 m/s.
3. Method according to claim 1 or 2 characterised in that the abrasive agent, the liquid fluid and the gaseous fluid are biased with approximately the same pressure which lies between 2.0265 and 12.159 x 105 Pa (2 and 12 bar), preferably between 4.053 and 8,106 x 105 Pa (4 and 8 bar).
4. Method according to one of claims 1 to 3 characterised in that the pressure is applied intermittently.
5. Method according to one of claims 1 to 4 characterised in that the pressure is adjusted so that the mixture of abrasive agent, liquid and gaseous fluid pulsates in the pipe.
6. Method according to one of claims 1 to 5 characterised in that the running direction of the mixture during the cleaning process is reversed at least once.
7. Method according to one of claims 1 to 6 characterised in that the abrasive agent, the liquid and the gaseous fluid is passed through the pipe by applying excess pressure and/or a vacuum.
8. Method according to one of claims 1 to 7 characterised in that the added abrasive agent and / or the fluid is moved in circuit and used repeatedly.
9. Method according to one of claims 1 to 8 characterised in that the cleaned pipe is blow-dried and then coated with plastics.
10. Method according to one of claims 1 to 9 characterised in that the coating is provided by using a vacuum to suck through a synthetic resin plug.
11. Method according to one of claims 1 to 10 characterised in that the cleaned pipe is provided with a second plastics coating after the first layer has already polymerised at least in part.
12. Method according to one of claims 1 to 11 characterised in that the abrasive mixture is comprised of

    1 part by volume abrasive agent

    1 to 12 parts by volume, preferably 3 to 7 parts by volume, of a liquid fluid and

    80 to 3000 parts by volume, preferably 600 to 1200 parts by volume of a gaseous fluid (at normal pressure),

    wherein the mixture of abrasive agent, liquid and gaseous fluid is sent through the pipe to be cleaned by applying excess pressure and/or vacuum.
13. Method according to claim 12 characterised in that the liquid fluid is water and the gaseous fluid is air.
14. Method according to one of claims 12 or 13 characterised in that the mixture can have particle sizes of up to approximately 10 mm, preferably up to approximately 6 mm.
15. Method according to one of claims 12 to 14 characterised in that a binding agent is mixed in with the mixture.
16. Method according to one of claims 1 to 15 characterised in that supply and return lines (22,51) are each connected alternately to adjoining water connecting points (47) of the pipeline system (31) and that cleaning takes place of each pipe section lying between two adjoining connecting points (10/ last section and ...).
17. Method according to one of claims 1 to 16 characterised in that the supply and return lines (22, 51) are each connected blockwise to the cleaning device and that the running direction of the cleaning composition is reversed by changing the supply and return lines (22, 51) blockwise (9/2nd section).
18. Device for renovating pipes with a container (13) for holding an abrasive agent, a mixer pipe (21) which is connected to the container (13) through a shut-off member which is formed as a dosing device or dosing valve (32) wherein the mixer pipe is attachable to at least one pipe which is to be cleaned, with a pump (43), at least one supply line (20) provided on the container (13) for feeding in a liquid fluid, a supply line (17) provided on the mixer pipe for feeding in a gaseous fluid and with pressure means connected to this supply line (17) for accelerating the gaseous fluid, characterised by a further supply line (19) provided on the mixer pipe (21) for feeding in a liquid fluid wherein the pipe to be cleaned is part of a pipeline system having a number of connecting points.
19. Device according to claim 18 characterised in that a separator (33) as well as supply and return lines (22, 51) are provided wherein the supply lines (22) serve to supply the cleaning composition to the water connecting points (47) and the return lines (51) serve to return the cleaning composition from the water connecting points (47) into the separator (33).
20. Device according to claim 19 characterised in that the separator (33) is connected through a first line (41) having a pump (43) to the lines (19) and/or (20) for the liquid fluid, and through a second line having a valve (35) to the container (13) and that the return lines are connected to the separator (33) and the supply lines (22) are connected to the mixer pipe.
21. Device according to claim 19 or 20 characterised by a distributor battery (53) on the mixer pipe (21) and a connecting battery on the separator (33) to which the supply and return lines (22, 51) can be connected interchangeably.

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