CN1161547A - Device for checking leaktightness of wall of tubes of heat exchanger - Google Patents

Abstract

A detector includes at least one injection head (16a,16b) for injecting water into the tube extremity, a device (16b) for sealing tube (5), a device for suppling water to injection head, a device for placing the injection head (16a,16b) into the tube (5) extremity and securing it there, a sliding free type piston moved inside the tube and adevice for measuring the water press in the tube (5).

Description

Detect the device of leaktightness of wall of tubes of heat exchanger

The present invention is relevant with the device that detects leaktightness of wall of tubes of heat exchanger, and is more particularly, relevant with the pick-up unit of leaktightness of wall of tubes in the steam generator of pressurised water reactor.

The steam generator of pressurised water reactor has a branch of crooked tube bank that takes the shape of the letter U, and the pipe end of tube bank all is fixed on the tube sheet.

When steam generator operates, very high temperature and very the reactor coolant water inflow tube bank of high pressure, the tube wall of tube bank constitutes the heat conductive wall that the pressurization chilled water flows through in the nuclear reactor in the steam generator, add cooling water pressure so just to the heating of supplying water, after being heated, water supply just in steam generator, vaporizes, therefore, the tube wall of restraining in the steam generator has just constituted the once part of steam generator and the barrier between the secondary part.

So importantly the leakproof completely of the tube wall of steam generator just can avoid a liquid coolant that comprises active substance of pressurization is incorporated into the secondary cooling system of steam generator like this.Steam generator can stand a certain amount of weakening in that nuclear reactor is in service, for example, because the pressure (hydraulic) water that is configured a liquid coolant of nuclear reactor is to the tube wall corrosion of metal or be configured the corrosion of the water supply of nuclear reactor secondary liquid coolant to tube wall.The weakening of steam generator can show by crackle occurring, therefore a liquid coolant just occurred and has been seeped in the secondary liquid coolant of steam generator.

The working specification of pressurised water reactor regulation will be carried out leakproof at interval to the tube bank of steam generator every certain hour and be detected so that check out that particularly percolation ratio is limited under the limit of a regulation between liquid coolant and the secondary liquid coolant.

All these detections must make the leaky pipe of bundle of steam generator be convenient to identification.

Generally, bundle of steam generator is checked with eddy-current method.

Detecting with eddy-current method under the situation of tube wall flaw, for determine whether pipe seepage need to repair, stop up or replace the detection that then available helium adds.

Yet, having proved that it is not very representational testing with helium, therefore also just can not assess satisfactorily so that whether be necessary cramming certainly the percolation ratio of pipe.Any risk during for fear of the operation steam generator, therefore must stop up the seepage that does not have critical character, and it is both difficult and expensive to carry out the operation of stopping up bundle of steam generator, and the efficient of steam generator and validity are also successively decreased along with the increase of stopping up the pipe number simultaneously.

Therefore, wish to have the program of a detection bundle of steam generator, more particularly, a program that detects heat transfer tube bundle is arranged, make the percolation ratio of the heat transfer tube bundle that is in operation as far as possible accurately assess or measure.

Advised that water is filled in each pipe that need detect and detected steam generator, and then further in the big water gaging inlet tube and measure two hydraulic pressure between the additional pipe of introducing water.

Have only and when water-filling at the beginning, remove contained air in the pipe carefully, this program could be measured the pipe of seepage reliably, therefore this program must detect each pipe that the seepage tube bank may occur continuously and since in tube bank a large amount of pipes (several thousand pipes) so must carry out many times continued operation.

Up to the present, also there is not a kind of proving installation of pressure (hydraulic) water to carry out the leakproof detection to many pipes so that carry out effectively assessing in advance with regard to aeriferous pipe continuously and promptly in managing at the beginning.

Therefore, the purpose of this invention is to provide a kind of each end of heat exchanger tube is fixed on the tube sheet carries out leakproof to the small part tube wall and detects, this device flows through at heat-exchange fluid can try one's best aspect the seepage of tube wall accurately assesses operating heat exchanger tube speed performance, and this device is received when extracting inner air tube out fully on each pipe of heat exchanger continuously, rapidly and effectively so that to managing interior water-filling.

This device has:

At least one water sprays into the wherein shower nozzle of a pipe end;

The device of a blanked-off pipe;

The water supply installation of supply fountain head;

Introduce also rapidly the device of cartridge nozzle at pipe end;

The air extractor of the air that begins to have in tube sealing so as under no air regime to managing interior water-filling, this device is made up of an energy mobile board-like piston of free skating in pipe.

In order to make the present invention clear understandable, now be illustrated, with reference to two accompanying drawings that are used for detecting the embodiment of steam generator pipe in the pressurised water reactor of apparatus of the present invention by limiting examples;

Fig. 1 is the elevation drawing of pressurised water reactor steam generator partial sectional view;

Fig. 2 and Fig. 3 are according to the sectional elevation drawing of two successive stages of detecting operation in the first embodiment of the invention with the explanation pick-up unit;

Fig. 4 A is the partial sectional view of Fig. 2 and device feature shown in Figure 3;

Fig. 4 B is the side view at used free-piston of steam generator water-filling stage;

Fig. 4 C is the zoomed-in view of the interior details of circle C among Fig. 4 A;

Fig. 5 and Fig. 6 are as the hydraulic pressure of the function of time and the variation diagram of water capacity when adding water pressurization carrying out leakproof detection in the pipe;

Fig. 7 is the sectional elevation drawing of the pick-up unit of second embodiment of the invention.

As shown in Figure 1, the steam generator of pressurised water reactor represents that with label 1 shell 2 of arranging the tube bank 4 of steam generator 35 in one is arranged.

Bundle of steam generator 4 respectively manage 5 for U-shaped and manage 5 U-shaped, the two straight terminations of justice of dividing and be fixed on the tube sheet 3 of firmly linking steam generator shell 1.

Pass tube bank 4 pipes 5 ends of tube sheet 3 and expose in by dividing plate 8 spherical water tanks 7 divided into two parts, two parts of water tank 7 make a liquid coolant flow into respectively managing in 5 of bundle of steam generator 4 by the primary cooling system that nozzle 6a or 6b link steam generator.

During reactor shut-down, steam generator shell and tube bank discharge water also are full of air, so can enter the spherical wall that water tank 7 is also passed in water tank 7 interior walkwaies.

Fig. 2 and illustrated in fig. 3 be to detect two stages of the device of leaktightness of wall of tubes at bundle of steam generator 5 enterprising line operates with the present invention.

In two side-entrance cabins separately and exit cabin that water tank 7 is separated by dividing plate 8, pass the pipe 5 straight ends of justice of dividing of tube sheet 3 and expose in water tank 7.

Detection seepage program of the present invention is carried out after water discharges fully during reactor shut-down and in the steam generator.Be full of air in the housing of steam generator and the pipe subsequently.

Some walkway by each cabin of the device that detection will be used is incorporated into the water tank of steam generator.The control device district that another part is then operated by operating personnel outside the water tank of steam generator.

The pick-up unit of representing with label 1 of the present invention has two parts 9a and 9b that are introduced in the water tank 7, each is one of in two cabins of water tank, because 9a is identical with 9b so only introduce one of them just on two parts of device 10, its assembly is then represented with the label of band angle a, installs the corresponding assembly of 10 parts 9b and then represents with the label of band angle b.

The parts 9a of device 10 has a support 11a, and support 11a is fixed on the end of operate wall in the introducing water tank cabin or is made up of the end of motion arm.

This motion arm is known fully and is used for from these steam generator water tanks steam generator being detected and maintenance job.

These known motion arms can be placed to solid instrument at the arm end and expose in the water tank cabin any pipe end of steam generator and be and axially align.These motion arms can also be incorporated into the pipe end that exposes in the water tank cabin to instrument by moving of its vertical direction.

Fig. 2, Fig. 3 and Fig. 4 represent support 11a, and one side has a video camera 13a and also has a hydraulic package 12a on the other hand in its termination, and it has the device of fixed nozzle head 16a, and shower nozzle then sprays into pipe end to water.

Shown in Fig. 4 A, hydraulic package 12a has the body of chamber 15a 14a is arranged in one.

Fountain head 16a has one to be fixed on the interior pipe 17a of support 14a so that axially passing chamber 15a, pipe end 17a links pipe end spare securely or upwards is the pipe close of horn-like back taper, and pipe close 18a small footprint is linked pipe end 17a and linked the column part that a diameter is slightly less than steam generator 5 internal diameters.On the outside surface of the cylindrical section of pipe close (18a), have four grooves, in each groove, place a sealing 20a.

Hollow pipe close 18a communicates with one plug end with supply pipe 17a end, and its other end then links to each other with a sleeve 21a and is used for water is sent in the steam generator 5.The tube wall of sleeve 21a has and send water aperture 22a, and supply pipe 17a is meshed with the hole of passing hydraulic package body 14a parts with sealing means in order to expose in chamber 15a, and this pipe 17a provides the hermetically enclosed of chamber 15a bottom.

The corresponding end of chamber 15a in its bottom has an endless member 23a to be the fixing perforate of sealing shape, and this endless member provides closing of a part to chamber 15a and has one along the axially extended lining of chamber 15a.Load onto piston 24a so as in chamber 25a and in the pipe box tube of annular element 24a to move axially, this piston 24a is mobile in chamber 15a so that be the sealing shape by periphery section 25 large-diameter end of being formed of installing by one, and this piston 24a also has the small diameter portion of an installation to move in the hole of annular element 23a so that be the sealing shape by seal 26.

The small diameter portion of piston 24a is to have the form of sleeve of longitudinal cut, and this longitudinal cut is limited between two flexible hooks at least, extends in the hole of annular element 23a sleeve.From Fig. 4 C, can find out, on the outside of hook end 27 at its cylindrical section of each deflection, have all oral regions 27 ', at the other end, flexible cheicers 27 also has the inner face of a back taper portion-form, its drift angle is substantially equal to the drift angle of pipe close 18a back taper part.

With hydraulic oil (fluid) by being fixed on the oil pipe 28a on the hydraulic package body 14a and being delivered in the chamber 15a at a side or the opposite side of the major diameter of piston 24a part by the passage (not shown) of opening in hydraulic package body 14a and expose in chamber 15a.

Loading onto the piston 24a with tubulose slides along pipe 17a so that be the sealing shape by seal 29.

Pipe 17a then inwardly supplies water by a conduit 30a.

As shown in Figures 2 and 3, conduit 28a and 28b be separately to hydraulic package 12a and 12b fuel feeding, and link the hydraulic pump 31 of a supply hydraulic oil, and this pump 31 is positioned at the outside of steam generator water tank 7.

To head of nozzle 16a, the conduit 30a of 16b links to each other with pump 32 with 30b with supplied with pressurized water, is positioned at the outer water pump 32 of water tank and is supplied water by a water tank 33.

Pump 31 to hydraulic package 12a and hydraulic package 12b supply hydraulic fluid moves piston 24a or 24b so that move the flexible hook 27 that links to each other with piston, and is as mentioned below, and head of nozzle 16a or 16b are locked in the pipe 5.

Water pump 32 makes head of nozzle 16a and/or 16b output water under high pressure.

Fig. 4 B illustrates parts 34 that are made of free slide plate piston, introduces current and makes parts 34 mobile in pipe 5 by managing an end of 5 by pipe close 16a and 16b.

Slide plate piston 34 has a cylindrical body 34a, and this cylindrical body end has a minor diameter and three slide plate dish 34b, and the diameter of this slide plate dish 34 is substantially equal to the internal diameter of steam generator 5.

Fig. 2 and detection seepage device 10 shown in Figure 3 have a tensimeter 35, when pipe when detecting seepage with regard to energy measurement pipe 5 internal pressures.

With reference to Fig. 1,2,3,4A and 4B illustrate the operation that detects the steam generator pipe seepage with above-mentioned pick-up unit 10 now.Device 10 parts 9a and 9b have the draining of being incorporated into and are full of the support 11a and the 11b in corresponding cabin in the steam generator water tank of air.

Expose at the pipe end of tube sheet 3 downsides and can be discerned and such head of nozzle 16a of support 11a and 11b emplace and 16b accurately extension vertically in each cabin at water tank in pipe 5 ends.

Support 11a moves up so that head of nozzle 16a is incorporated into pipe 5 first end, and seal 20a provides sealing between the pipe close of the inwall of pipe and head of nozzle 16a.

In head of nozzle 16a was incorporated into pipe 5, head of nozzle 16a and pipe end were then observed by video camera 13a, so just can accurately control leak detection operation outside water tank.

The chamber 15a of hydraulic package 12a supplies its hydraulic oil by pump 31 and conduit 28a, and the move up back taper outside of end back taper inner face and pipe close 18a of the flexible hook 27 of result of piston 24a contacts.

The engagement of pipe close 18a in the termination of pipe 5 had a surplus fully because of its back taper portion also in pipe.When deflection hook 27 contacted with the back taper portion of pipe close 18a, this back taper portion made the outer cut sides 27 of hook ' contact with the metal of pipe 5 and removes so that the head of nozzle 16a in pipe close 18a and pipe provides effectively and fix.

Free-piston 34 is engaged in the pipe and by the first sealing pad 34b on the water spray sleeve 21a upper surface and stops.

Head of nozzle 16b is placed in slightly below of pipe 5 second ends, and the result leaves a space (see figure 2) between the top of the inlet of pipe and head of nozzle 16b.

Spray into water with being fixed on first end of the head of nozzle 16a of pipe in 5 to pipe 5 by pipe.The water that sprays move in the pipe from cunning board-like piston 34, as shown in Figure 2, free-piston shown in it is each continuous position in pipe.In the moving of piston, under the promotion by water spray in pipe, the board-like piston 34 of free skating is discharged air contained in the pipe from second extreme direction of pipe, because second end of this pipe is not sealed by the second head of nozzle 16b, so when the slide plate piston moved, contained air was extracted out by this second end in the pipe 5.Water spray has been full of in the pipe behind the piston 34 till piston 34 arrives this point of second end of pipes and has rested in the upper end of the water tube 22b of the second head of nozzle 16b.

In case free-piston 34 arrives second end of pipe, the second support 11b moves up so that mesh the second head of nozzle 16b at second end of managing 5.When carrying out aforesaid operations, free-piston 34 makes the water-filling in the pipe 5 that certain indwelling be arranged, and this operation is to carry out under the control of video camera 136.

Head of nozzle 16b is meshed with second end of pipe, and the second pipe close 18b is positioned at pipe 5 fully as a result, drives the piston 24b of hydraulic package 12b then so that the pipe close of head of nozzle 16b is fixed on second end of pipe 5.

Used water pump 32, last a large amount of water sprays in the pipe 5 so that increase the pipe internal pressure.

Hydraulic pressure in the pipe progressively increases, and pump 32 in order to accomplish this point, will be calculated the shift value of pump piston stopping operating after the working cycle of fixed number.

Hydraulic pressure in the pipe is measured continuously with tensimeter 35.

The water that sprays into additional amount in the pipe makes the hydraulic pressure in the pipe be increased to certain level, and this depends on the additional water flowing rate that sprays into.

Under the non-leakage situation of pipe, the pressure in pipe after the pump stall still remains unchanged.Resetting under the pump situation, for the water that sprays additional amount again in pipe, once more during stall, inner pipe water pressure is incremented to second level once more after pump sprays into a certain amount of water.

Additional water flowing rate and hydraulic pressure so this just produces continuous hydraulic pressure step (level) in the inlet tube are measured as the function of time.

Under the situation of pipe seepage, when the water that stops the pump pressure additional amount enters in the pipe, the hydraulic pressure by the seepage pump since the outflow of water successively decrease.

Successively decreasing of internal pressure of record pipe just can be found the pipe of seepage after the pump stall, in the situation that the pipe seepage is arranged, measure the current vector of this seepage so that increase the initial value of getting back to original stress level by in pipe, sending into additional water flowing rate once more so, and then once stop the pump pressure additional water flowing rate, when pressure drops to a certain value, send into additional water flowing rate arrives this level up to pressure initial value in the pipe once more.By restarting this operation at the appointed time and by calculating the Total Water in the inlet tube, rate is oozed in the leakage that just can determine pipe under setting pressure or degree is oozed in leakage.

Fig. 5 illustrates total additional water flowing rate in the inlet tube as the variation (curve 40) of the function of time and pipe internal pressure (curve 41) over time, and prerequisite is that pipe is non-leakage.

Straight-through arrival when being equivalent to the final level of full test pressure in Fig. 5, the pressure step when being equivalent to the pump stall is fully straight, this pressure is about 27 millibars, because last stage pressure remains unchanged, tests this and comes to an end, and announces the pipe flawless.

Fig. 6 illustrates additional water flowing rate in the inlet tube as the coordinate diagram (curve Figure 40 ') of the function of time with manage internal pressure (curve 41 ') over time, and prerequisite is the pipe seepage.

Force value is that 7 millibars the first pressure step is flat fully, for pressure being increased to 14 millibars of values, continues this test by introducing additional water flowing rate.After the pump stall, the pipe internal pressure is successively decreased in time, this means that pipe has crackle, additional water flowing rate is sprayed into after about 200 seconds certain period in the pipe so that hydraulic pressure risen again again and gets back to 14 millibars of values.After this pump stall again, because seepage is arranged, hydraulic pressure successively decreases once more.

Periodically restart water spray so that after each time sprays into additional water, the pressure liter is got back to 14 millibars of values.During this period of time, measure the Total Water in the inlet tube, leak the rate of oozing here from the pipe that just can calculate under 14 millibars of pressure.

Fig. 7 illustrates second embodiment of a pick-up unit of the present invention, and this pick-up unit is used for detecting the tube wall that has crackle pipe 36 in the steam generator pipeline section.

The pick-up unit of second embodiment is preferably used in the situation that has just detected the flaw district of pipe or only need detect the pipe in this district when carrying out writing down for the first time, for example, be positioned near the zone of transition of leaving the tube sheet, in the case, just needn't install Fig. 2 and the device that needs to introduce two separation inner parts of water tank that contains shown in Figure 3, also needn't in pipe, be full of water fully and take out air in managing.

Device by shown in the label 39 shown in Figure 7 has a water to spray into the interior head of nozzle 37 of pipe, and this head of nozzle has the section of an extending axially 37a with 38 endings of end block.

The section of the extending axially 37a length of head of nozzle 37 is to be determined by the length of the segment of tube of need detection leaktightness of wall of tubes.

Install a ringwise free-piston 42 so that piston moves along the section of the extending axially 37a of head of nozzle 37, the cross section of this piston is circular and well-balanced.

43 intercalations of one seal are between the outside of the extension 37a of the inner face of piston 42 and head of nozzle 37.

Piston 42 also has an all seal 44 of ring, and the sealing part has a flexible lips or an O-ring seals, is sealing with the inboard of pipe 36 and contacts when piston moves.

Head of nozzle 37 limits a chamber 45 by a tubular nozzle 46 sealings, one passage 45a communicates the internal capacity of the chamber 45 of head of nozzle 37 with the pipe 36 of head of nozzle 37 tops, nozzle 46, expose in the hole of chamber 45 inboards and link a pump and a water tank by a flexible pipe 47, these pumps and water tank all with Fig. 2 and embodiment illustrated in fig. 3 in pump 32 and water tank 33 with.

Head of nozzle 37 has an all seal 48 of ring, and it can have flexible lips or an O-ring seals, and sealing part 48 provides head of nozzle 37 and managed sealing between 36 inside surfaces.

Head of nozzle 37 can be fixed on the motion arm that is placed in the steam generator water tank, the section of the extending axially 37a that this motion arm makes pick-up unit 39 and the pipe that will detect be the head of nozzle that axially aligns and make head of nozzle 37 and combine with free-piston is incorporated in the pipe 36, then, that part of pipe that is positioned at head of nozzle 37 tops is by flexible pipe 47 nozzles 26, chamber 45 and passage 45a and inwardly water delivery.Water in the inlet tube upwards pushes away free-piston 42, and seal 44 is pressed to the inside surface of pipe 36 with encapsulating method and rubbed, and piston 42 was just managed contained air extraction to part between head of nozzle 37 and the piston 42 fully before this pipeline section is full of water like this.

So the seal 48 of depending nozzle head 37, water just is retained in the pipeline section.

Be noted that in the case, needn't be fixed on head of nozzle 37 in the pipe, just enough in order to make head of nozzle 37 be the sealing and fixing position as long as fix head of nozzle with motion arm.

Till piston 42 moves when the upper surface of piston 42 contacts with the lower surface of the block 38 that preferably is connected with a seal 49 along the section of the extending axially 37a of head of nozzle 37.At this moment, free-piston 42 has constituted the pipe close that a sealing will detect pipeline section with block 38.

As described in Fig. 6, detect tube wall as Fig. 2 by means of the operation similar to detecting whole tube wall program.

Be full of water fully in pipe after, the additional water yield sprays into the pipeline section that cooperates block 38 to be sealed by piston 42 and boosts in pipe 36 so that be step ground.Should be noted that when pipeline section 36 boosts the seal 44 of free-piston 42 and the seal 48 of head of nozzle 37 tend to distortion so that the sealing of a sealing is provided between the inwall of free-piston (or at head of nozzle) and pipeline section 36.

One tensimeter is used for measuring the pressure in the pipeline section, particularly measures two force value between adding in the pipeline section continuously to water.

Detecting under the situation of whole tube wall, the seepage that just can detect pipe to the described similar manner of Fig. 6 with Fig. 2 also can be measured the percolation ratio of pipeline section.

No matter be that Fig. 2 and Fig. 3 are described and produce and be used to detect apparatus of the present invention of homogeneous tube, no matter be that Fig. 7 is described and produce and point-device information that apparatus of the present invention of being used to detect pipeline section all can the relevant steam generator tube wall of very fast acquisition seepage, carry out above-mentioned detecting operation and just can find crack and seepage on the tube wall very reliably, pipe or pipeline section are removed in advance in pipe, begin the air that includes before the water-filling with regard to pick-up unit.

Therefore under the situation that a large amount of pipes or pipeline section must detect, the head of head of nozzle and pick-up unit in pipe or pipe end to put in place rapidly so that carry out detecting operation.Pipe also seals automatically and apace.

Maybe may restart detecting operation methodically by pipe and the pipeline section that each suspection is had crackle, just can determine that very reliably that pipe need stop up, keeps in repair or replace whole pipes of tube bank.

Doing this so just can avoid occurring in and stopped up reality in the steam generator and do not need choked pipe.

The present invention is not limited to the above embodiments.

So the head of head of nozzle or device can have might not be as above-mentioned shape and structure, the fixed nozzle head is in the also not necessarily above-mentioned appearance of the device of pipe end.

Apparatus of the present invention and program also can be used for detecting heat exchanger tube and the not necessarily tube bank of the steam generator of pressurised water reactor, also can be applicable to such as on chemical industry and the energy production industry.

Claims (7)

1) pipe end of a kind of detection heat exchanger tube sheet (3) is characterized in that to the device of small part pipe (5,36) wall seepage it has:

At least one water sprays into the head of nozzle (16a, 16b, 37) of pipe end;

The device of a sealed tube (5,36) (16b, 42,38);

To the device of head of nozzle (16a, 16b, 37) supply water spray,

Introduce and rapidly head of nozzle (16a, 16b, 37) be fixed on fast the device (5,36) of pipe end;

A device of taking out inner air tube in order not have air to exist again to pipe (5,36) interior water-filling at the beginning is to be made up of the free slide plate piston (34,42) that can move in pipe;

The device (35) of the interior hydraulic pressure of a measuring tube (5,36).

2) device according to claim 1, (16,16b) termination of (5) end sealed tubes (5) is managed in each leisure first and second to it is characterized in that it one first and second head of nozzle being arranged.

3) according to claim 1 and 2 each described devices, it is characterized in that head of nozzle (16a, 16b) a pipe close (18a is arranged, 18b) so that equipment circumferential seal (20a) tubular part and columnar part are arranged so that plunger (18a, 18b) sealing between outside and pipe (5,36) inner face to be provided, pipe close (the 18a of tubulose, 18b) endoporus that communicates with confession pressure (hydraulic) water conduit is arranged, this conduit then links to each other with water supply installation (32,33).

4) device according to claim 3, it is characterized in that pipe close (18a, 18b) the handlebar pipe close is fixed on outside (27) and the pipe close (18a that has notch by at least two, 18b) inner face that matches of face axially is the device that flexible hook (27) is formed, this pipe close surface is inclination with respect to tube's axis, so that hook (27) outwards moves, for hook (27) moves between off-position and working position vertically, in the working position, hook (27) is pressed against by its cut sides (27 ') on pipe (5, the 36) inner face and fixes.

5) device according to claim 1, it is characterized in that head of nozzle (37) has a section of extending axially (37a) that is provided with a block (38) in the end away from head of nozzle, wherein load onto free-piston (42) and move axially so that be with sealing means along the extension (37a) of head of nozzle (37), so that with block (38), when free-piston (42) moves the device that constitutes a sealed tube when contacting with block vertically in pipe.

6) according to each described device of claim 1 to 5, it is characterized in that introducing and rapidly head of nozzle (16a, 16b, 37) device that is fixed on pipe end (5,36) has a motion arm (11a, 11b), this motion arm can be any pipe (5 of head of nozzle (16a, 16b, 37) with heat exchanger, 36) axially align and the end of head of nozzle inlet tube (5,36).

7) device according to claim 6 is characterized in that (13a, (11a 11b) goes up so that remote control head of nozzle (16a, 16b, 37) is incorporated into pipe (5,36) end video camera 13b) to install to motion arm.

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