WO2007088061A1 - Device and method for the interior cleaning of a pipe filled with liquid - Google Patents

Abstract

The device (2) according to the invention contains a feed line (4) for cleaning agent under high pressure, a nozzle carrier (6) which is connected to said feed line in a rotationally fixed manner and on which at least one cleaning nozzle (44b-e) and at least one counter nozzle are arranged, wherein the counter nozzles (46) are oriented (62a) and dimensioned in such a manner that recoil forces (F<SUB>r,</SUB> F<SUB>c</SUB>) accumulate to form a transverse force (F<SUB>ges</SUB>) in the direction of the cleaning nozzles (44b-e), and a conically tapering, eccentric point (58) at the opposite peripheral position of the transverse force (F<SUB>ges</SUB>). In the method according to the invention, the nozzle carrier (6) is rotated (88), the angle of rotation of the nozzle carrier (6) is detected, the retraction length of the nozzle carrier (6) is detected, the nozzle carrier (6) is introduced into the pipe system (80) as far as the junction (96), and the nozzle carrier rotated (88) in such a manner that the transverse force (F<SUB>ges</SUB>) points in the direction of the partial pipe (98a, b) to be approached, and the nozzle carrier (6) is advanced (82) further without rotating (88) until the nozzle carrier (6) is located in the partial pipe (98a, b).

Description

 description

Device and method for internal cleaning of a tube filled with liquid

The invention relates to a device and a method for the internal cleaning of a tube filled with liquid, in particular a radioactively contaminated pipeline of a nuclear reactor.

The internal cleaning of pipes, ie pipelines, presents a problem in many areas of technology. In particular, nuclear reactors have a plurality of pipelines of a plurality of branched pipelines, some of which are radioactive material, e.g. Transport liquids.

Especially in so-called KANDU reactors are located in the immediate vicinity of the reactor core, the so-called feeder pipes. These lead here as part of the primary circuit heavy water. These are about 400 curved pressure tubes, which all converge in a collector or branch from there. Each tube is about 15m long at about 50mm in diameter. These pressure tubes have to be checked from time to time for cracks, material erosion on the rough wall, etc. Before the actual test, all pipes must be decontaminated or cleaned.

Such pipe systems have hitherto been cleaned or decontaminated, if at all, only by chemical processes. Depending on the amount of interior wear to be removed during cleaning deposits on the pipes and the composition of the removed deposits resulted in very high amounts of secondary waste, eg a mixture of contaminated substances and cleaning agents. In addition, all heavy and therefore expensive water might have to be drained off. Such cleaning is therefore time consuming and expensive.

Generally, a high-pressure water jet technology is known for internal pipe cleaning. The cleaning effect depends strongly on the distance of the high pressure water jet emitting nozzle from the body to be cleaned. If a maximum distance is exceeded at a given water pressure no cleaning takes place. So far, it has been customary to work at different nominal diameters of tubes with different nozzle heads, which each ensured a defined distance of the cleaning nozzle to the tube inner wall. Each change a nozzle head is involved here consuming. Nozzle heads, the narrower pipe sections downstream diameter can clean extended pipe sections are - if available at all - consuming and expensive.

The object of the present invention is to predefine an improved apparatus and an improved method for the internal cleaning of a pipe.

With regard to the device, the object is achieved by a device for internal cleaning of a tube filled with liquid, in particular a radioactively contaminated pipeline of a nuclear reactor, - with an insertable into a pipe to be cleaned along its central longitudinal axis with a first end feed line High pressure cleaning agent in the range from 10000 bar to 4000 bar,

with a nozzle carrier connected in a rotationally fixed manner at the first end with respect to the central longitudinal axis, on which at least one cleaning nozzle aligned transversely to the central longitudinal axis with respect to its jet direction and at least one counter nozzle for dispensing the cleaning agent are arranged,

wherein the counter-nozzles are aligned and dimensioned so that the recoil forces generated by cleaning nozzles and counter-nozzles during operation due to effluent cleaning agent add up to a transverse force acting on the nozzle carrier transversely to the central longitudinal axis,

in which the transverse force on the nozzle carrier is directed in the direction of the central jet direction of all cleaning nozzles, in which the end of the nozzle carrier facing away from the feed line is conically tapered towards a tip,

- Wherein the tip is within the projection surface of the nozzle carrier along the central longitudinal axis, and eccentrically outside the central longitudinal axis, - in which the tip is arranged at the opposite circumferential position of the nozzle carrier as the direction of the transverse force.

The invention is based on the idea of improving the high-pressure water jet technology when used in the interior of a pipe that is filled with liquid, and makes use of the knowledge that an effective distance between the cleaning nozzle and the pipe inner wall can be set via recoil forces of the effluent cleaning agent , All this happens in the liquid filling the pipe, in other words "under water". Therefore, according to the invention, not only one or more cleaning nozzles are arranged on the nozzle carrier, but also one or more counter-nozzles. All these nozzles are supplied with cleaning agent and spray it. In this case, all nozzles generate recoil forces. These are dependent on the dimensioning of the respective nozzle, ie how much cleaning agent flows out of the counter nozzle, and their orientation, that is to say the direction of jet of the cleaning agent radiated by the nozzle.

The cleaning nozzles are usually dimensioned for optimal cleaning effect. The recoil forces generated by the cleaning nozzles are known on the basis of their arrangement, so alignment and dimensioning. The counter jets are therefore adjusted accordingly. By appropriate dimensioning of this targeted recoil forces are generated by the counter jets. The counter jets can thus be arranged at given cleaning nozzles so that all recoil forces add to a force acting on the nozzle carrier transverse force.

None of the nozzles must be controllable, neither in the flow rate nor in your beam direction. The lateral force results solely from their dimensioning.

For the sake of simplicity, the following is always spoken of a cleaning nozzle and a counter nozzle representative of a single or a plurality of these. Also, the forces mentioned are always in the sense of a single or the sum of several partial forces, depending on how many nozzles actually exist to understand. The entire device, namely the hose-shaped supply line for cleaning agent and the nozzle carrier attached thereto will generally run with its central longitudinal axis approximately parallel to the central longitudinal axis of the pipe to be cleaned. Thus, if the transverse force acts transversely to the central longitudinal axis of the arrangement, then it also acts essentially transversely to the central longitudinal axis of the tube and thus to the tube inner wall.

Due to the rigid arrangement of all the nozzles on the main body, the transverse force also always acts on a fixed circumferential position of the main body or of the device. The device is thus always deflected with the same circumferential position ahead of the pipe inner wall. There, the cleaning nozzles will be arranged, as this is a deflection of the cleaning nozzles to the pipe inner wall out.

The distance between the cleaning nozzles and the pipe wall is thus kept low, irrespective of the pipe diameter, and the cleaning agent flowing out of the cleaning nozzle actually develops a cleaning effect when hitting the pipe wall. In general, the cleaning nozzles will be arranged so that they are aligned in operation with their beam directions on the shortest path to the pipe inner wall out.

The only prerequisite is that the supply line is flexible enough to allow a deflection of the nozzle carrier due to the transverse force. Since the supply line has to be flexible in any case in order, for example, to retrace pipe bends, this also gives the nozzle carrier enough freedom of movement beyond a narrow point in order to move toward the pipe wall via the transverse force. Thus, with the device, a cleaning of pipes with different, or in their course variable inside diameters is made possible without, for example, a nozzle head must be replaced. The outer diameter of the entire device, so the supply line, the nozzle carrier, etc. can be chosen so that the device can also be passed through the narrowest points of the piping system. Decisive for this is usually that the maximum outer diameter of hose and nozzle carrier in a plane perpendicular to the central longitudinal axis of the device is smaller than the smallest inner diameter of the piping system in a plane perpendicular to the central longitudinal axis of the tube.

The lateral force is directed at the nozzle carrier in the direction of the central jet direction of all cleaning nozzles. The mean jet direction of all cleaning nozzles is in this case defined so that counter to this direction, the resulting repulsive force of all cleaning nozzles is directed. Since it is a repulsive force, this moves the nozzle carrier together with the cleaning nozzles just opposite to the beam direction, ie away from the pipe wall. Thus, if the transverse force acts precisely against this direction, namely in the direction of the central jet direction of all cleaning nozzles, then they are again moved towards the pipe wall to be cleaned, which leads to a further improvement in the cleaning effect.

The nozzle carrier is rotationally fixed with respect to the central longitudinal axis connected to the supply line. As a result, the nozzle carrier and with it the cleaning nozzles within the tube is particularly easy to rotate about the central longitudinal axis, namely in the outside of the pipe, the supply line is rotated. By the rotation of the nozzle carrier and thus the cleaning nozzles turn can the pipe can be cleaned on the entire inner circumference. The transverse force then rotates together with the nozzle carrier and, even during rotation, causes the nozzle carrier to move in the direction of the cleaning nozzles, ie, ahead of them, and thus to the pipe wall.

The supply line facing away from the end of the nozzle carrier is shaped so that it tapers conically towards a tip. In other words, therefore, the end of the device, which is inserted into the tube ahead, is tapered conically. Constrictions in the pipe can thus be easily overcome, since the conical taper represents a ramp for obstacles. The entire device then does not hit the obstacle, but slides over this away. The tip also lies within the projection surface of the nozzle carrier along the central longitudinal axis and eccentrically outside the central longitudinal axis. If you look in the direction of the central longitudinal axis of the tip of the nozzle carrier, so this does not protrude laterally beyond the cross section of the device. The outer circumference or cross section of the device is thereby not increased. By rotating the tip so the tip can be placed in different relative positions to the pipe inner wall to avoid various obstacles.

The lateral force presses the nozzle carrier at a certain circumferential position, namely that of its direction of attack, towards the tube wall. The tip is arranged at the opposite circumferential position, thus also at the same circumferential position as the counter nozzle of the nozzle carrier. Since the counter nozzle moves the nozzle carrier on its opposite side in the direction of the pipe inner wall, the tip of the nozzle carrier is as far away as possible from the pipe inner wall. From the pipe inner wall protruding obstacles are thereby overcome by the top or the adjoining this bevel.

Two cleaning nozzles can be arranged with an angular offset in a plane perpendicular to the central longitudinal axis of the nozzle carrier. These thus cause also by the corresponding angle offset recoil forces, which attack the nozzle carrier. Due to the angular offset, the two recoil forces of the two cleaning nozzles partially cancel each other out. The counter nozzle thus only has to overcome the uncompensated part of the resulting repulsive force of the two cleaning nozzles in order to generate a transverse force, which moves the cleaning nozzles back to the pipe wall.

The arrangement of the nozzles in a plane perpendicular to the central longitudinal axis also act on the nozzle carrier no tensile or shear forces in the direction of the central longitudinal axis. Thus, the nozzle carrier or the entire device does not have to be kept at a certain longitudinal position in the tube otherwise.

The angular offset can be 0 ° to 170 °, depending on the application. Between 60 ° and 80 °, this leads in particular to a particularly favorable cleaning effect of the cleaning nozzles on the pipe inner wall, with the recoil forces already canceling out to a large extent.

The cleaning nozzles may be arranged in pairs in staggered planes perpendicular to the central longitudinal axis. The cleaning effect of the device is thereby reinforced because several cleaning nozzles directed to the inner wall of the tube are. This is seen in the direction of the central longitudinal axis, a larger pipe section effectively cleaned.

The tip may be at the outer edge of the screen. As a result, the run-up slope from the tip to the opposite circumferential position of the device is maximum.

The nozzle carrier may comprise a base body carrying the nozzles and an end cap releasably secured thereto. On the one hand so the device can be easily assembled or disassembled for maintenance purposes. On the other hand, various end caps, e.g. for various pipes or pipe systems, attachable to the body. Even nozzles can be easily replaced accordingly and so different recoil, and transverse forces can be realized.

The end cap may have a tip as discussed in detail above. This also applies to the fact that thus different end tip tip formations of the tip for different pipes or pipe systems can be mounted on the device.

The cleaning agent can be water. In particular, in the cleaning of contaminated pipes in the above-mentioned nuclear reactor thus no special cleaning solutions or the like are needed. The waste dissolved from the pipe inner wall as well as the water can easily be filtered out of the heavy water in the pipes. The very expensive heavy water does not need to be disposed of.

With regard to the method, the object is achieved by a method for the internal cleaning of a tube filled with liquid, in particular a radioactively contaminated tube. a nuclear reactor, whereby the internal cleaning of a pipe system with a branching into partial pipes is carried out, with the following steps:

- In a pipe to be cleaned is a supply line for cleaning agent along its central longitudinal axis with a first

Introduced at the end, wherein at the first end a nozzle carrier is connected to which at least one with respect to their beam direction aligned transversely to the central longitudinal axis cleaning nozzle and at least one counter nozzle are arranged - the cleaning agent is the nozzles with high pressure in the range of 1000bar to 4000bar supplied

- give during operation. Cleaning nozzles and counter jets from detergent and thereby generate recoil forces, the counter jets are aligned and dimensioned so that add the recoil forces to a transverse to the longitudinal axis acting on the nozzle carrier transverse force.

- The nozzle carrier mounted rotationally fixed on the supply line is rotated by rotation of the supply line,

- The nozzle carrier is rotated together with the nozzles about an axis parallel to the central longitudinal axis in the region of the nozzle carrier axis

the angle of rotation of the nozzle carrier during its rotation is detected,

on the supply line, the entry length of the nozzle carrier along the central longitudinal axis is detected,

- for starting a partial pipe:

- the nozzle carrier is inserted into the pipe system to the junction,

the nozzle carrier is rotated in such a way that the transverse force points in the direction of the partial tube to be approached, - The nozzle carrier is further advanced without rotating it while the nozzle carrier is in the sub-pipe.

The inventive method has already been explained in connection with the device according to the invention. It should again be explicitly pointed out that the transverse force oriented transversely to the central longitudinal axis of the feed line or of the nozzle carrier is also substantially transverse to the central longitudinal axis of the pipe to be cleaned. The reason for this is that when introducing the supply line and nozzle carrier into the tube, the central longitudinal axis of the device automatically aligns approximately parallel to the central longitudinal axis of the tube. The reason for this in turn is the limited flexibility of the supply line in the form of a hose, which is generally a high-pressure hose. This is usually just flexible enough to follow tube bends, but otherwise do not form entanglements or the like inside the tube.

The nozzle carrier is rotated together with the nozzles about an axis parallel to the central longitudinal axis in the region of the nozzle carrier axis. Since, as just explained, the central longitudinal axis of the nozzle carrier essentially corresponds to the central longitudinal axis of the tube, then the nozzles attached to the nozzle carrier also rotate about the central longitudinal axis of the tube, so that the tube is cleaned on its inner wall on the entire circumference.

The nozzle holder is fixed in rotation on the supply line. Thus, the nozzle carrier is rotated by rotation of the supply line. As described above, this provides a particularly simple way of rotation of the nozzle carrier and thus of the raw material. gutter cleaning on the entire inner tube circumference, since the supply line outside the tube can be rotated easily and inexpensively by a suitable device. A rotary drive in the area of the arrangement, which is introduced into the interior of the tube, is therefore superfluous.

The angle of rotation of the nozzle carrier is detected during its rotation. By detecting the angle of rotation of the nozzle carrier and the current angle of rotation of the cleaning and counter Ssen and thus the angle of rotation of the currently acting lateral force is known. In the pipe to be cleaned thus the nozzle carrier can be selectively moved to any circumferential position. This is useful on the one hand for a targeted cleaning, on the other hand for starting off pipe branches. If a pipe branch branches off laterally at a certain circumferential position of the pipe, then the nozzle carrier can be moved toward this circumferential position and thus into the vicinity or in front of or into the branch.

At the supply line, the insertion length of the nozzle carrier along the central longitudinal axis is detected. In addition to the detection of the angle of rotation, this represents a further important prerequisite for targeted internal cleaning of the pipe, as the length of the nozzle carrier and thus of the cleaning nozzle in the pipe is known about the insertion length of the device in the pipe. It is also important for the abovementioned approach of branches to know the length of insertion of the nozzle carrier into the pipe. Since, as mentioned several times, the central longitudinal axis of the device extends approximately along the central longitudinal axis of the tube, the insertion length of the supply line is approximately equal to the longitudinal position of the nozzle carrier in the tube. If you get to the intersection of the internal cleaning of the pipe system, the following steps are carried out:

- The nozzle carrier is inserted into the pipe system to the junction, - The nozzle carrier is rotated so that the lateral force points in the direction of the approaching branch,

- The nozzle carrier is further advanced without rotating it while the nozzle carrier is in the branch.

As already described, the insertion will be controlled until the branch over the detection of the insertion length. By detecting the angle of rotation, the nozzle carrier is then positioned in front of the branch so that it comes to rest at the circumferential position of the pipe at which the pipe branch lies. If the nozzle carrier is then advanced further, it is pressed by the transverse force further in the direction of the pipe branch and thus also advanced into this. Since the rotation of the nozzle carrier is prevented at this point in time, the nozzle carrier thus slides along the pipe inner wall into the branch at the corresponding peripheral position.

Of course, this requires a knowledge of the geometry of the pipe system, in particular with regard to the length and circumferential positions of the branches in the pipe system, which are targeted to be approached. This is, of course, especially with the o.g. Pipelines of a nuclear power plant, as this is the most accurate record of this information.

Since the procedure in the liquid in the pipe, in the case of

So under water, is carried out, particularly high pressures for the detergent can be used, with which this is supplied via lead and nozzle carrier the nozzles. The cleaning agent is supplied to the nozzles at high pressure in the range of 1000 to 4000 bar. The high pressure results in the advantage of very small amounts of cleaning agent, which are required for cleaning.

In addition, to locate the cleaning nozzle in the pipe by insertion length and angle of rotation and an ultrasonic location can be performed from outside the tube to determine the position or check.

With the method, in particular the radioactively contaminated pipelines of a nuclear reactor can be cleaned. As already mentioned, the method for cleaning pipelines in the nuclear reactor is particularly well suited because of the rapid implementation, since no nozzle changes for different pipe diameters must be performed, the small amount of cleaning agents, etc.

For a further description of the invention reference is made to the embodiments of the drawings. They show, in each case in a schematic outline sketch:

1 is an exploded view of a cleaning device according to the invention,

2 shows mutually perpendicular longitudinal sections a) along Ha-Ha and b) along Hb-IIb through the assembled device according to FIGS. 1-4,

3 shows a cross-section along ^' IH-III through the tip of the device according to Fig.1-4,

4 shows a cross section along IV-IV through the nozzle region of the device according to FIGS. 1-4, 5 shows the device according to FIGS. 1-4 in the interior cleaning of the pipe,

FIG. 6 shows the device according to FIG. 1-4 in the case of a) approach to a pipe branch, b) branching into the first and c) branching into the second part pipe.

1 shows a cleaning device 2, which encloses a nozzle head 6 fastened on one end of a high-pressure hose 4. The nozzle head 6 in turn comprises a main body 8, a compression sleeve 10 and a protective cap 12.

All components have a common central longitudinal axis 14 and with respect to this substantially cylindrical construction.

The cleaning device comprises further, not shown and not explained components at the other end of the high-pressure hose 4, such. a drive for advancing and rotating the high-pressure hose 4, a pump for charging the high-pressure hose 4 with cleaning agent, valves, etc.

In its region 16 facing the high-pressure hose 4, the main body 8 has a connection nozzle with an outer diameter D _{2 that} matches the inner diameter D _{1 of} the high-pressure hose. This is provided with anti-skid devices 18, which indeed allow sliding of the high-pressure hose 4 in the direction of the arrow 20, that is, on the base body 8, but prevent its slipping against the direction of the arrow 20. The high-pressure hose 4 can be slipped onto the base body 8 until its front end 22 stops at a radially extending stop limiting the region 16. Shoulder 24 comes to rest. By subsequent pressing of the compression sleeve 10, also in the direction of the arrow 20, the high pressure hose 4 is secured to the base body 8 against slipping in the direction of the arrow 20. The compression sleeve 10 also includes unspecified anti-slip devices. The front end 26 of the compression sleeve 10 then abuts against a further stop shoulder 26 of the main body 8. Between the stop shoulders 24 and 28 is a circular cylindrical portion 30. The compression sleeve 10 has an outside diameter D _3rd

Between the stop shoulder 28 and the tip 16 of the base body 8 opposite the region 16 there is a cylindrical region 34 which has an external diameter D ₄ <D ₃ .

From the high-pressure hose 4 facing end 36 forth to the area 34 of the base body 8 is provided with an axial bore 37, so that at the end 36, an opening 38 is present. This communicates with plugged high-pressure hose 4 with its interior 40th

In region 34, five radially inwardly extending, reaching to the central longitudinal axis 14 bores are mounted in the main body 8, which therefore communicate with the opening 38 communicating channels. In alternative embodiments, not shown, two or more such channels may be provided instead of the five.

Starting from a first bore 42a, which is not visible in FIG. 1 ^" , are symmetrical to the bore 42a opposite point, each with an angular displacement of about 35 ° each two times two more holes 42 b-e arranged, which are arranged in pairs in two different axial planes with respect to the central longitudinal axis 14. In the alternative embodiments just mentioned, these are otherwise arranged at the region 34 according to their number.

In the bores 42b-e is a cleaning nozzle 44b-e, in the bore 42a a counter nozzle 46 is set. The cleaning nozzles 44b-d and the counter nozzle 46 are therefore in communication with the interior space 40 of the high-pressure hose 4. They serve to deliver not shown cleaning agent, which is supplied through the interior 40 of the high-pressure hose 4 in the direction of the arrow 20.

In Umfangsriehtung to the bore 42a offset by 90 ° and diametrically opposite in the main body 8, two further holes 48a, b are introduced, which, however, do not lead to the central longitudinal axis 14 and thus do not communicate with the opening 38.

In the holes 48 a, b fastening screws 50 a, b can be screwed. When the protective cap 12 is placed against the arrow 20 on the base body 8, the fastening screws 50a, b pass through the openings 52a, b in the protective cap 12 and thus fasten them to the base body 8. The protective cap 12 has an outlet in the mounted state Holes 42a-e aligned openings 54a-e. The protective cap 12 again has the outer diameter D ₃ and thus connects seamlessly to the compression sleeve 10.

At the end 56 opposite the high-pressure hose 4, the protective cap 12 runs conically towards a tip 58, which is at a distance D3 / 2 spaced from the central longitudinal axis 14. The tip is located at the same circumferential position as the opening 54a corresponding to the counter nozzle 46.

FIG. 2a shows a section through the assembled cleaning device 2 from FIG. 1 along the sectional plane IIa-Ha. Once again, the bore 37 and the bore 42a communicating with it, with the counter-nozzle 46 inserted and the communicating opening 54a can be seen. Likewise, the location of the tip 58 at the corresponding circumferential position. In addition, the cleaning nozzles 44b-e can be seen in their holes 42b-e. Likewise, the between the main body 8 and compression sleeve 10 clamped or mounted high-pressure hose 4 can be seen.

FIG. 2b shows the bores 48a, b not reaching the bore 37 with inserted screws 50a and b and corresponding openings 52a and b. Fig. 2a, b also show that the tip 12 tapers conically from its circular circumference with diameter D3 on the tip 58, wherein a conical side 60, the circular cylindrical outer shape of compression sleeve 10 continues straight.

3 shows the section IH-III through Fig. 2a. Here again the shape of the protective cap 12 can be seen, namely how it tapers conically from the diameter D ₃ to the tip 58. Also, it can be seen how the tip of the cap is located here at the outer edge D _3/2 the projection 59 12th

4 shows the section IV-IV through Fig.2. Here again is the angular position of the holes 42a-e and 48a, b to see each other. In particular, once again the bore 42a is symmet- to see oppositely drilled holes 42b-e, which against each other enclose an angle α of about 70 °. The directions 62a-c are also shown in FIG. 4, under which the counter nozzle 46 and the cleaning nozzles 44b-e emit cleaning agents during operation. These have the same angular orientation to each other, as the holes 42a-c.

Due to the cleaning agent flowing out during operation, each nozzle generates a recoil force. The cleaning nozzles 44b-e produce

UJ VJU the forces F _R , the counter nozzle 46 the force F _G on the main body 8. These forces add up vectorially to the base body.

UU per 8 attacking total force F _ges . This lift the

auch der mittleren Strahlrichtung 63 aller Reinigungsdüsen 44b-e, die so auch die Richtung der vektoriellen Summe allerUJ UJ perpendicular to the total force F acting shares of the forces F _R because of the symmetrical arrangement and the same dimensioning of the cleaning nozzles 44b-e to each other and the counter nozzle 46 on each other. Equal dimensioning here means that all cleaning nozzles in terms of magnitude equal recoil forces

also the mean beam direction 63 of all cleaning nozzles 44b-e, so also the direction of the vectorial sum of all

UJ

Recoil forces F _R corresponds. Alternatively, the recoil

UJ forces F _R also be unevenly or asymmetrically dimensioned, so there is an asymmetrical force attack on the body 8 to allow a peeling effect during the cleaning process.

Fig. 5 shows a pipe to be cleaned 80, in which in the direction of arrow 82, the cleaning device 2 has been introduced. In the direction of the arrow 82, the tube 80 widens from an inner diameter D ₆ in a first section 84 to a Inner diameter D ₇ in a second section 86. As soon as the nozzle head 6 has reached the region 86, it is deflected from the central longitudinal axis 88 of the tube 80 to the tube inner wall 90. This takes place in that not shown cleaning agent in direction 62a-c, as shown in Fig. 4, emerges from the nozzle head 6 and by the resulting back

"XI

Shock forces a total force F _{ge ^} acting on the nozzle head 6.

This corresponds to the transverse force according to the invention and acts exactly opposite to the direction 62a, that is, the jet direction of the counter nozzle 46. Thus, the total force F _tot but also acts in

Direction of the mean jet direction of all cleaning nozzles 44b-e. The cleaning nozzles 44b-e are thus moved in the immediate vicinity of the pipe inner wall 90, which enables effective cleaning of these.

During the entire cleaning process, the cleaning device 2 is rotated about its central longitudinal axis 14 in the direction of the arrow 92. This happens outside the tube in a manner not shown. In section 84 of the tube 80, because of the inner diameter D ₆ , which is only slightly larger than the outer diameter D _{3 of} the high-pressure hose 4, this causes the high-pressure hose 4 to rotate about its central longitudinal axis 14. By acting on the nozzle head 6 total force

F _{ge ^} however, rotates portion 86 of the tube 80 of the nozzle head 6 from in Fig. 5 extended position shown in the direction of arrow 94 about the central longitudinal axis 88 of the tube 80. After a rotation of 180 ° and an additional feed of the cleaning device 2 in Direction of the arrow 82 is the nozzle head 6 then in the dashed line position. Even then, the cleaning nozzles 44b-e are still close to the tube inner wall 90, for which the total force F _ges constantly makes. Thus, the entire tube 80 can be effectively cleaned even in the narrowed throat portion 86.

6a shows an alternative pipe 80 with a branch 96 in two further sub-pipes 98a, b. The cleaning device 2 is in the cleaning operation for cleaning the pipe inner wall 90. It is, as explained above, by turning the high-pressure hose 4 with simultaneous action

UJ the total force F _ges about the central longitudinal axis 88 of the tube 80 moves. In the cleaning operation, therefore, the entire inner wall 90 is cleaned in section 86 to the junction 96.

After the section 86 has been cleaned, the sub-pipe 98b is then to be cleaned. As shown in Fig. 6b, therefore, the cleaning device 2 is advanced so far that it comes to rest above the sub-pipe 98b. The rotation of the cleaning device 2 about the central longitudinal axis 14 is stopped when the nozzle head 6 - seen in Umfangsriehtung the pipe inner wall 90 - comes to rest at the circumferential position of the branch of the sub-pipe 98a, as shown in Fig. 6b.

From this position, the cleaning device 2 is only further advanced in the direction of the arrow 82; one rotation is missing. Since cleaning agents continue to emerge from the cleaning nozzles and the counter nozzle, the total force F _eκ continues to _act on the nozzle head 6. As a result, this is moved toward the direction of the partial pipe 98b. If the nozzle head 6 has penetrated far enough into the partial tube 98b, as shown in dashed lines in FIG. 6, the rotation can take place to be resumed around the central longitudinal axis 14 and the cleaning of the pipe inner wall 90 as shown in FIG. 6a, but in the sub-pipe 98b continue to be performed.

If the sub-pipe 98b is completely cleaned, the cleaning device 2 is retracted again into the position shown in solid in FIG. 6b and the cleaning device 2 is moved by 180 ° about the central longitudinal axis 14. Because of the overall force F _ges, which continues to act, this leads to the situation illustrated in FIG. 6c.

As in the case of the branching into the partial tube 98b, the cleaning device 2 on the tube inner wall 90 is now advanced in the direction of the arrow 82 into the partial tube 28a without rotation about the central longitudinal axis 14. In this case, it moves relative to the branch of the sub-pipe 98a along the pipe inner wall 90 along. A diversion into the partial tube 98b is thus reliably avoided. If the cleaning device 2 with its nozzle head 6 reaches the position shown in dashed lines in FIG. 6c, the rotation about the central longitudinal axis 14 can be reused and the cleaning on the inner wall 90 of the sub-pipe 98a can be continued.

28

LIST OF REFERENCE NUMBERS

2 Cleaning device 58 Tip 5 4 High-pressure hose 59 Projection surface 6 Nozzle head 35 60 Cone side 8 Base 62a-c Direction 10 Compression sleeve 63 Medium jet direction 12 Protective cap 80 Tube 10 14 Center longitudinal axis 82 Arrow 16 Area 40 84, 86 Section 18 Anti-slip 88 Center longitudinal axis 20 Arrow 90 Pipe inner wall

22 end 92.94 arrow

15 24 stop shoulder 96 branch

26 end 45 98a, b part pipe

28 stop shoulder

30 range Di inside diameter

32 Tip D ₂ , D ₃ , D ₄ Outer diameter 20 34 Range D ₆ , D ₇ Inner diameter

36 end 50 a angle

UJ

37 Bore F _R recoil cleaning nozzle

38 opening VXJ

F _G recoil counter nozzle

40 interior

Total volume 25 42a-e bore

44b-e Cleaning nozzle 46 Backing nozzle 55 48a, b Bore

50a, b fixing screw 30 52a, b opening 54a-e opening 56 end

Claims

23Ansprüche 1. Device (2) for the internal cleaning of a liquid-filled tube (80, 98a, b), in particular a radioactively contaminated pipeline of a nuclear reactor, with a supply line (4) for detergents under high pressure in the range from 1000 bar to 4000 bar, which can be introduced into a pipe (80, 98a, b) to be cleaned along its central longitudinal axis (14) with a first end (22), with a nozzle carrier (6) connected in a rotationally fixed manner at the first end (22) with respect to the central longitudinal axis (14), at which at least one cleaning nozzle (44b-e) aligned with respect to its jet direction (62b, c) transversely to the central longitudinal axis (14) and at least one Counter nozzle (46) are arranged for dispensing the cleaning agent, - Wherein the counter-nozzles (46) are aligned (62a) and dimensioned such that the cleaning nozzles (44b-e) and counter-nozzles (46) in operation by escaping cleaning agents At the same time, recoil forces (F _R , F _G ) were generated at the nozzle carrier UJ (6) add transverse force (F _ges ) acting transversely to the central longitudinal axis (14), UJ in which the transverse force (F _ges ) on the nozzle carrier (6) is directed in the direction of the central jet direction (63) of all cleaning nozzles (44b-e), - In which the supply line (4) facing away from the end of the nozzle carrier (6) is tapered conically to a tip (58), 24 - In which the tip (58) within the projection surface (59) of the nozzle carrier (6) along the central longitudinal axis (14), and eccentrically outside the central longitudinal axis (14), - In which the tip at the opposite circumferential position of the nozzle carrier (6) as the direction of attack of the lateral force (F _ge ,) is arranged. 2. Device (2) according to claim 1, wherein two cleaning nozzles (44b, c / 44d, e) with an angular offset (a) in a plane perpendicular to the central longitudinal axis (14) on the nozzle carrier (6) are arranged. 3. Device (2) according to claim 2, wherein the angular offset (a) between 0 ° and 170 °, in particular 60 ° and 80 °. 4. Device (2) according to any one of claims 2 or 3, wherein the cleaning nozzles (44b-e) in pairs (44b, c / 44d, e) are arranged in staggered planes perpendicular to the central longitudinal axis (14). 5. Device (2) according to one of the preceding claims, wherein the tip on the outer edge (D _3/2 ) of the projection surface (59) lies. 6. Device (2) according to any one of the preceding claims, wherein the nozzle carrier (6) comprises a nozzle (44b-e, 46) supporting the base body (8) and a detachably attached to this end cap (12). The device (2) of claim 6, wherein the end cap (12) has the tip (58). 25 8. Device (2) according to one of the preceding claims, wherein the cleaning agent is water. 9. A process for the internal cleaning of a liquid-filled pipe (80, 98a, b), in particular a radioactively contaminated pipe of a nuclear reactor, wherein the internal cleaning of a pipe system (80) with a branch (96) in sub-pipes (98a, b ), with the following steps: - In a pipe to be cleaned (80, 98 a, b), a supply line (4) for cleaning along its central longitudinal axis (14) with a first end (22) inserted ahead, wherein at the first end (22) a nozzle carrier (6) connected is, on which at least one with respect to their beam direction (62b, c) transversely to the central longitudinal axis (14) aligned cleaning nozzle (44b-e) and at least one counter nozzle (46) are arranged, the cleaning agent is supplied to the nozzles (44b-e, 46) at high pressure in the range from 1000 bar to 4000 bar, - in operation give cleaning nozzles (44b-e) and counter jets (46) \ JJ IXJ Detergent and thereby generate recoil forces (F _R , F ₀ ), the counter-nozzles (46) aligned and dimensioned <JU (JU are that the recoil forces (F _R , F _G ) to a on the nozzle carrier (6) transverse to the central longitudinal axis (14) attacking transverse KXJ force (F _tot) add, - The nozzle carrier (6) mounted rotationally fixed to the feed line (4) is rotated by rotation (92) of the feed line (4) (88), - The nozzle carrier (6) is together with the nozzles (44b-e, 46) to one to the central longitudinal axis (14) in the region of the nozzle carrier (6) parallel axis (88) rotates the angle of rotation of the nozzle carrier (6) during its rotation (88) is detected, 26 on the supply line (4), the insertion length of the nozzle carrier (6) along the central longitudinal axis (14) is detected, for starting a partial pipe (98a, b): the nozzle carrier (6) is introduced into the pipe system (80) as far as the branch (96), - The nozzle carrier is rotated (88), that the lateral force LU (F _ges ) in the direction of the approaching sub-pipe (98a, b) shows, - The nozzle carrier (6) is further advanced (82) without rotating it (88) until the nozzle carrier (6) in the sub-pipe (98 a, b) is located. 10. The method according to claim 9, wherein for the angle of rotation of the nozzle carrier (6) of the rotation angle of the supply line (4) is detected.