CN1164017A - Method and device for extracting section of tube from heat exchanger and use of method and of device - Google Patents
Method and device for extracting section of tube from heat exchanger and use of method and of device Download PDFInfo
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- CN1164017A CN1164017A CN 97103490 CN97103490A CN1164017A CN 1164017 A CN1164017 A CN 1164017A CN 97103490 CN97103490 CN 97103490 CN 97103490 A CN97103490 A CN 97103490A CN 1164017 A CN1164017 A CN 1164017A
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Abstract
Inserting a coupling sleeve into one end of the tube section to be extracted, the sleeve having at least one flexible toothed gripping zone which can be inflated by a pressure fluid delivered through a disconnectable duct. The end of the sleeve opposite the duct is closed by a safety membrane which bursts at a pressure exceeding a pre-set limit. Once the sleeve is in the required position inside the tube section to be extracted the gripping zones are inflated, the duct is disconnected, and a traction is applied to the sleeve with the aid of a flexible rod to withdraw it from the heat exchanger.
Description
The present invention relates to take out from heat exchanger the method for section of a pipe, the end of this pipe is crimped on the tube sheet.The present invention specifically is applied to take out the pipe of one section pressurized-water reactor steam generator, so that detect a position of this pipe.
The heat exchanger for example steam generator of pressurized-water reactor generally comprises the very thick tube sheet that passes pipe, the flush of its inlet face of formation of this tube-to-tube sheet connection, and protrude from the opposite side of tube sheet, the exit surface of this tube sheet defines the sub section of steam generator, and this part receives treats vaporized water supply.The inlet surface of tube sheet constitutes the upper wall of water tank divided into two parts, and this water tank transmits and be recovered in the also pressure (hydraulic) water of carrier band heat that circulates in the pipe of steam generator tube bank, and this heat is used for the heating and the above-mentioned water supply of gasifying.Its upper end is that every pipe of the steam generator of bending has first straight-tube portion and second straight sections, and expose in the part of water tank the former end, and expose at another part of water tank the latter's a end.
The steam generator pipe that forms tube bank is crimped in the hole of the suitable diameter that passes tube sheet, and in fact this crimping passes the whole thickness of tube sheet.The crimping pipe is with Pi Geer tube rolling method tube wall to be crimped on the hole wall in the tube sheet in tube sheet, so on the wall of each pipe on the exit surface side of tube sheet, have transition region between the deformation part of pipe and non-deformations are divided.
Stress in this transition region of pipe is concentrated significantly the other parts greater than pipe, thus at this regional pipe no matter be its inner surface that contacts with the pressure cooling water of nuclear reactor or with outer surface that water supply contacts on the local corrosion that all increased.
When the steam generator of shutdown maintenance nuclear reactor, the essential pipe of checking is to determine the corrosion resistance of this transition region after using a period of time.This inspection particularly has under the situation of damage finding in transition region, needs to take out the section of a pipe that comprises transition region.
This taking-up only is positioned at zone to be detected when carrying out this taking-up the pipe does not take place to be only when deformation does not change with its state significant.
In addition, the part that damage is arranged that is usually located at transition region of pipe has crackle, and circumference crackle particularly is so main danger is tube brakes when taking out pipe from steam generator, even in some cases, have to abandon the taking-up of pipe because crackle is bigger.
Among the FR-A-2591744 and FR-A-2638014 by the proposition of Framatome company, proposed with the method for adhesives a sleeve to be fixed in the pipe, this sleeve covers cracked zone.This sleeve must be fixed on the sleeve pipe in the both sides of cracked zone, and the traction bridge sleeve of damage zone of joining two pipes together then is from the pipe sleeve pipe of choosing.Can take out section of a pipe thus and not at the infringement zone of pipe stress application.
But clearly, the tractive force that the method by the bonding sleeve of adhesive applies is limited, and this can not carry out the draw operations of some segment of tube.In addition, this method of adhesive strength of the adhesion zone of sleeve is very insecure relatively.Carrying out this method also needs complicated apparatus, and takes out for making that sleeve is in place also to need very long operation cleverly.
Proposed to use the taking-up instrument, this instrument comprises the sleeve pipe with vertical slit in the end of tubular wand, and this slit separates some some engagement fingers that have tooth on its whole outer surface.Installation has diameter and amplifies a kind of bar that the end comprises the end of pulled surface, and it can be slided in the tubular rod with engagement finger.Drive link is installed slidably can be made the engagement finger separately, thereby the toothed portion that has of finger is engaged on the metal of tube wall.On the tubular wand of instrument, apply tractive force then, thereby pull out and take out pipe.
Take out pipe and drive the engagement pincers because used very long rigid rod, so this withdrawing device is difficult to be used in the water tank of steam generator.This device is difficult to be used for taking out the intrafascicular peripheral tube of steam generator tube especially.
In addition, extraction device can not make the crackle of pipe partly be removed and do not apply the stress that has the infringement effect on this section pipe, thereby can not detect the part of damage with this part
In fact, taking out under the situation that the crackle part is arranged of pipe, the pipe utmost point has the danger of breaking, thereby must abandon the taking-up of this section pipe in a lot of situations.
Therefore the method that the purpose of this invention is to provide one section heat exchanger tube of a kind of taking-up, the end of this pipe is crimped in the tube sheet, method of the present invention can be used for taking out the pipe that is positioned at the intrafascicular any zone of steam generator tube, and this method can be extracted the section of a pipe of for example crackle with damage out, and when extracting out, on this section pipe, do not apply big stress.
For reaching this purpose:
-by an end of pipe a kind of cover pipe connections is incorporated in the pipe, this cover pipe connections comprises having at least one tubular metal flexible boot that tooth chucking district is arranged and the device that this flexible boot is expanded, this flexible boot is by a conduit supply pressure fluid, and this pipe joint element is fixed in the end of pressure fluid delivery conduit;
-the cover pipe connections is moved be located in this section pipe to be extracted out in pipe up to it;
-flexible boot of cover pipe connections is expanded, thus utilize institute's applied pressure that the tooth zone that has of flexible boot is pressed against on the inner surface of pipe;
-sleeve connector in making flexible conduit and being fixed in pipe separates;
-apply tractive force on this section pipe of fixed muffle connector therein, thus it is taken out from the tube sheet of heat exchanger;
In order more to be expressly understood the present invention, utilize non-limiting example explanation how to carry out method of the present invention below and take out the section of a pipe of steam generator and used device, this device comprises the sleeve connector by pressurized fluid driven.
Fig. 1 is a partial cross section figure along vertical plane intercepting, and the water tank of steam generator and the section of a pipe that will take out with the inventive method are shown;
Fig. 2 and 3 is schematic sections, be illustrated in two steps of removing method respectively during, be used in the situation in the pipe that cover pipe connections in the removing method of the present invention is located in steam generator.
Fig. 3 A and 3B are the sectional views that is similar to Fig. 2 and 3, and two later step of taking out operation are shown respectively;
Fig. 4 is the longitdinal cross-section diagram that is used to carry out the cover pipe connections of removing method of the present invention;
Fig. 5 is the signal partial cross section view of the intrafascicular peripheral pipe of the part water tank of steam generator during taking out the step of section of a pipe and steam generator tube;
Fig. 6 is the axial, cross-sectional view that is used to take out the peripheral pipe sleeve pipe of steam generator connector;
Fig. 7 is a vertical cross section, and the partial cross section for steam generator part water tank illustrates the device that is positioned at the operating position that takes out section of a pipe;
Fig. 8 is that part is the front view in cross section, and the cable that is used to draw device shown in Figure 7 is shown;
Fig. 9 is the axial, cross-sectional view of traction device dop shown in Figure 7;
Fig. 9 A is the cross-sectional view along the A-A line intercepting of Fig. 9;
Fig. 1 illustrates the semicircle shell 1 of part of steam generator water tank 2, and this steam generator is positioned at the top of thick tube sheet 3, and tube sheet 3 is passed in hole 4, the fixing end of the pipe 5 of steam generator in each hole.
The bottom of tube sheet 3 is fixed on the wall 1 of water tank, and its top then is fixed on the bottom of steam generator shell 6, the tube bank of configuration pipe 5 in this shell 6.
The pipe 5 of steam generator tube bank is to become bent, is the U font, comprises two straight parts, and the end parts of straight part is fixed in two holes passing tube sheet 3, and exposes in two parts of being separated by dividing plate of water tank 2 respectively.
The end parts that is fixed on the pipe 5 of the tube bank in the hole 4 of tube sheet 3 enters water tank 2 from the lower surface or the inlet surface of tube sheet 3.
The end of pipe 5 is fixed in the hole 4 with pipe expanding method and welding.The wall of pipe 5 is being connected on the wall of tube sheet mesopore 4 with the pilgrim rolling method at its dilation.The internal residual stress that the transitional region 5a between the unstrained part of that part of of deformation during the expander and the pipe on plate plate 3 upper surfaces of pipe 5 has high concentration, thus more responsive at the pipe of transitional region to the stress corrosion in the operating reactor.Therefore in transition region 5a, form crackle more frequently near the pipe of the exit surface 3b of tube sheet 3.
Having on the wall of pipe 5 under the situation of crackle having adopted for example eddy current inspection operation detection to go out during the nuclear reactor shutdown, preferably taking out that section pipe that has cracked zone, so that it is detected entirely mutually.
Certainly, only comprise the pipe of cracked zone and when when taking out, not making this section pipe bear big stress from steam generator, taking out one section, detect this section pipe and just can provide Useful Information, bear the change risk of cracked zone structure and before taking out this section pipe, just may causing of excessive stress and break.
The removing method of the present invention that will illustrate below carrying out makes can take out section of a pipe with no damage, like this, just can test widely after taking out it.
Fig. 1 illustrates the part wall 1 of water tank, and this wall is passed in hole 7, and formation can enter the People's Bank of China gateway of a compartment of water tank.
By being incorporated in water tank and the pipe 5 through People's Bank of China hole 7, withdrawing device carries out method of the present invention.
Adopt known maintenance unit can carry out method of the present invention, this known maintenance unit can use in steam generator, thereby can detect a flaw or repair operation at the tube interior of tube bank with failure detector or instrument that the tube end through entering water tank is introduced.
This device comprises the maintenance arm, and the end parts 8 of this maintenance arm is shown in Fig. 1, and the pull-push piece 9 of roller is fixed on the end of arm 8.
Maintenance arm 8 can move in water tank, so that pull-push piece 9 can axially be collimated with arbitrary pipe in the tube bank.When its with tube bank in pipe 5 axially during the position of collimation, comprise at least that one group of pull-push piece 9 that pushes away, draws roller 10 can make to be fixed on conduit or the cable that elongated flexible piece for example is engaged among the pull-push piece gathering sill 9a and in axial direction on a direction or another direction, to move.At the axial collimation position of pull-push piece 9 and pipe 5, the gathering sill 9a in the pull-push piece 9 is along the bearing of trend of the axle of pipe 5.
In addition, conduit 11 end is fixed on the pull-push piece along the bearing of trend of the guide space between gathering sill 9a and the roller 10.Crooked conduit has 7 ends of passing tank shell 1 through the pavement facing to pull-push piece 9.Like this, being fixed on the instrument that flexible conduit for example is shown on the conduit 12 of Fig. 1 can be engaged to the conduit 11 from the outside of the water tank 2 of steam generator.
In the transition region 5a of pipe 5, detected under the situation of crackle, conduit 11 and pull-push piece 9 are used for the following cover pipe connections 15 that will illustrate is incorporated into water tank 2, be incorporated into pipe 5 then, be arranged in the transition region 5a that pipe 5 has crackle up to cover pipe connections 15.
The cover pipe connections that is fixed on flexible conduit 12 ends is incorporated into the intake section of conduit 11, then, shifts the group of rollers 10 of pull-push piece onto from the outside of water tank along sleeve pipe 12 usefulness hands always.With the roller of the pull-push piece of conduit 12 engagement the cover pipe connections 15 that is fixed in flexible conduit 12 ends is in axial direction moved,, make it be located in regional 5a then, as shown in Figure 1 so that make it penetrate pipe 5.
Make the end of flexible conduit 12 be connected in pump 14 through middle flexible conduit 13 then, this pump connects the pressure fluid vessel of drive sleeve connector 15.
Fig. 2 illustrates the transitional region 5a of pipe 5 with large-size, in this zone, has peripheral crackle 17 above the upper surface 3b of tube sheet 3 tight.
Fig. 2 also illustrates the cover pipe connections 15 that is fixed on flexible conduit 12 ends, and this connector is positioned at its use location in pipe, thereby can take out the section of a pipe that comprises the zone of being passed by periphery crackle 17.
Before pipe joint element 15 was introduced pipes 5, the top of the lower part that constitutes the pipe 5 that is removed part by otch 5b and pipe was to cut formation in the pipe by cutting tool is incorporated into through the inlet surface of tube sheet 3 in this pipe 5 from, this otch.
Between two slits in succession, the flexible metal cover of cover pipe connections 15 comprises indention 19, this tooth by flexible boot pressurization and be radially expanded the appropriate section of cover pipe connections is engaged on the inner surface of pipe 5.
Fig. 3 illustrates the outside flexible boot of cover pipe connections 15, and this cover is under pressurization and the radial expanded state, and what be configured in pipe has in the zone that crackle passes, and this mesh regional 15a that can make cover pipe connections 15 and the 15b of being radially expanded is engaged on and manages on 5 the inner surface.The zone of mesh regional 15a being positioned at crackle 17 below of the overcoat of cover pipe connections 15 and the engagement of pipe 5 inner surface, and the top mesh regional 15b of cover pipe connections 15 zone top with being positioned at crackle 17 contacts with the inwall of managing 5.
As described below, cover pipe connections 15 bridge joints are arranged in the cracked zone of the pipe 5 on the section of a pipe that will take out from steam generator.
Be located in the pipe and after its flexible boot expands by flexible conduit 12, use pull-push piece and on flexible sleeve 12, apply downward tractive force, as Fig. 3 illustrates with arrow 12 ' will overlapping pipe connections 15.Therefore sleeve pipe 12 separates with cover pipe connections 15, and this cover pipe connections is still stayed on the position of pipe 5.
Take out this pipe with draw-gear 50 then, this draw-gear and the inwall engagement of managing 5 are shown in Fig. 3 A and 3B.According to known mode, draw-gear 50 comprises the head that is made of the segment 51 that tooth is arranged, and this head can separate in pipe 5, thereby the head of draw-gear is expanded, and makes on its inner surface that is clamped on pipe 5.Tractive force is applied on the pipe thus, and is as shown in arrow 52, like this can be from take-off pipe 5 on the tube sheet 3.Section of a pipe with crackle is not subjected to any tractive force, because it is by cover pipe connections 15 bridge joints.
Fig. 4 illustrates cover pipe connections 15 with the cross section in more detail, and this connector can be used for the cracked zone of bridge joint steam generator pipe, utilizes this connector can take out the section of a pipe of crackle and this pipe is sustained damage.
Minor axis 20 comprises the end parts 20b with threaded interior hole that radially becomes big, and the end adapter 21 of cover pipe connections 15 is fixed on this end, and the hydraulic tube 12b pressurized of flexible conduit 12 that is connected to cover pipe connections 15 is engaged on this end.
Between the end parts of adapter 21 and minor axis 20, insert seal 22.Filter screen 23 is fixed on the exit portion in hole of the adapter 21 of the end parts 20b that is arranged in minor axis 20, this filter screen can prevent to be entered check valve 24 by the impurity that hydraulic fluid is carried secretly, enter into the passage 20a of minor axis then, and then enter the chamber that is used for expansion sleeve 15.
The check valve 24 that the pressure fluid that prevents admission passage 20a is back to delivery conduit is configured in the intake section of passage 20a, near the downstream of adapter 21.
From the end of cover pipe connections that adapter 21 is housed or the bottom to opposed end or the upper end surrounds and the central minor axis 20 of engagement cover pipe connections 15 be first pipe-shaped membrane done of lower seal Tapered Cup 25, elastomeric material 26, distance piece 27 with two tapered end seals, the second flexible tubular film done by elastomeric material 28 and seal close Tapered Cup 29.
The one group of annular element 25,26,27 and 28 that surrounds and mesh central minor axis 20 is fixed on the shoulder shape portion of minor axis 20 end 20b and the position between the top seal Tapered Cup 29, this Tapered Cup 29 comprises threaded central aperture, and the thread head of central minor axis 20 is screwed in this centre bore.
Lower seal Tapered Cup 25 is contained on the end parts 20b of central minor axis 20 by the mode of lip ring 30 with sealing.
In addition, cover pipe connections 15 comprises outside flexible boot 31, and this flexible boot makes its coaxial being engaged on these these parts when fixing one group of parts 25,26,27 and 28, make an overhang bracket of flexible boot 31 on the stop shoulder of lower seal Tapered Cup 25.Top seal Tapered Cup 29 is engaged on the upper end of flexible boot 31, and the upper taper part is screwed on the threaded portion of minor axis 20.After tightening, the upper end of flexible boot 31 just is pressed against the shoulder 29 of top seal Tapered Cup 29.
Two resilient flexibility cover 26 and 28 comprises the tapering point part, and this end parts is during installation with sealing means engagement lower seal Tapered Cup 25, distance piece 27 and corresponding tapering part top seal Tapered Cup 29.
The tapering point part of resilient flexibility cover 26,28 is fitted on the central minor axis 20 of cover pipe connections in the mode of sealing because sealing Tapered Cup 25 and 29 and the conical surface of distance piece 27 produce clamping force.
In two zones of core between tapered end divides, has and corresponding flexible boot 26 or the 28 shallow annular chambers that form promptly corresponding chamber 32 or 34 on the outer surface of the minor axis 20 of cover pipe connections facing to flexible boot 26 and 28.
Chamber 32 and 34 communicates with the central passage 20a of minor axis 20 by radial passage 33 and 35 respectively.
But the outside deformation cover 31 of cover pipe connections 15 is a kind of thin tubular metal covers, on the periphery of this cover, in two positions overlapping 26 and 28 respectively facing to resilient flexibility, this metallic sheath has ten slits that evenly separate, 31 slippages on flexible boot 26,28 in fact seamlessly of metal flexible cover.
(see figure 2) comprises indention 36 and indention 38 respectively on the outer surface of those parts of the flexible boot between the slit 18 31, the former is the indention on those parts of overcoat 31 facing to flexible boot 26, and the latter is the indention on those parts of overcoat 31 facing to flexible boot 28.
Sealing Tapered Cup 29 comprises the upper part with smooth hole, and the diameter in this hole is greater than the diameter of the threaded portion in the hole of sealing Tapered Cup 29, and this threaded portion meshes the end of minor axis, and this Tapered Cup 29 also comprises screw thread on its outer surface.
Pressure-limiting safety device 39 is contained in this smooth hole of sealing Tapered Cup 29, and is secured in place in this hole with the nut 40 that is screwed in sealing Tapered Cup 29 threaded portions.Pressure-limiting safety device is closed the end of passage 20a in the minor axis 20 to pressure fluid in the mode of sealing.Safety device 39 comprises the barrier film that prevents that fluid from passing, and the fracture pressure of this barrier film is corrected in factory, makes to reach for example about 400 when clinging to, this membrane ruptures when fluid pressure among the passage 20a of cover pipe connections.
Have type hole 40a on the nut 40, for example having cross section is hexagonal prismatic hole, for tightening or unclamping nut 40, instrument can be inserted in this prism hole, thereby barrier film safety device 39 can be put into its position or take out it.
As shown in Figure 2, when pipe has been put into and be located in to cover pipe connections 15 5 the time, bottom engaging piece 15a with cover pipe connections of indention 36 is positioned at tube sheet, below crackle 17, and region of engagement, the top 15b with cover pipe connections 15 of indention 38 is positioned at the free part of pipe 5, on crackle 17.
The central passage 20a of cover pipe connections 15 charges into the hydraulic fluid of pressure by the hydraulic tube 12b that is connected in counterpart 21 of flexible conduit 12.
Have the hydraulic fluid of pressure flow into central minor axis 20 and flexible boot 26 and and flexible boot 28 between the chamber 32 and 34 that forms.Hydraulic fluid expands resilient sleeve 26 and 28, thereby metal flexible cover 31 is radially expanded in two mesh regional 15a with indention 36 and 38 and 15b.
Pressure in the sleeve connector is set in for example 260 crust of predetermined value, and this pressure is by measure guaranteeing that the test that cover pipe connections 15 is clamped on the bulbs of pressure of necessary cover pipe connections in the pipe effectively determines.
The test of carrying out in the steam generator tube of about 20mm interior diameter is verified, on the cover pipe connections, can apply 40000 to 45000 newton's tractive force and the cover pipe connections is slided in pipe, if hydraulic fluid remains under the pressure that equals 230 crust at least.
40000 to 45000 newton's tractive force generally is enough to take out one section pipe from the hole of steam generator tube sheet.
When the hydraulic fluid pressure of cover in the pipe connections reached predetermined pressure for example during 260 crust, the pumping of hydraulic fluid will stop, and this stopping will being closed check-valves 24.Overlap the central passage of pipe connections and chamber then fully and isolated from outer medium, and be full of by the fluid that remains under 260 bar pressures.This pressure guarantees that cover pipe connections 15 is stuck in the pipe 5 effectively.Along the direction operation pull-push piece of traction flexible conduit 12, flexible sleeve 2 is separated with the cover pipe connections then, at this moment, remain on the inside that cover pipe connections 15 under the pressure still is located in section of a pipe to be removed by check-valves.The operation that is located in cover pipe connections 15 in the pipe and makes it stay chucking position in the pipe is called the operation of relief sleeve connector.
After pulling out flexible conduit 12, make drafting tool for example instrument 50 (Fig. 3 A and 3B) be located in the position in the water tank, this drafting tool has traction piece, this traction piece is equipped with the device 51 of chucking this section pipe 5 parts.
On pipe, apply tractive force just can take out have crackle pass the zone section of a pipe 5.Tractive force is sent to regional 15b from the regional 15a of pipe by the cover pipe connections.Because cover pipe connections 15 is crossed the zone that crackle 17 passes, so during the pulling force with about 40000-45000 newton took out, this pipe did not bear any stress.
Can some cover pipe connections be located in the intrafascicular some pipes of generator tube adjoining land, so that take out the section of a pipe that wherein is placed with the cover pipe connections subsequently in turn.
Therefore method of the present invention can be taken out the section of a pipe that is used for checking simply and fastly, and can not damage this section pipe when taking out.
Fig. 5 schematically illustrates the part water tank 2 of steam generator and the peripheral pipe 5 ' of steam generator, and promptly its end is fixed on the pipe in the hole 4 ' of passing tube sheet 3, and this pipe is near the peripheral edge portion that is fixed in the tube sheet of water tank wall 1 and steam generator shell 6.
Taking out the peripheral tube period of the day from 11 p.m. to 1 a.m that its transition region has crackle, if do not detect this crackle before taking out, then the part of the crackle in the transition region of pipe may be broken.
Therefore the top pipe above the crackle that can not taking-up have split; The remainder 5 ' of pipe 5 ' is still stayed in the steam generator as shown in Figure 5.
In order to take out the remainder of this section pipe 5 ', need to adopt the taking-up assembly of special shape, mainly be because the gap in water tank is too little when axially collimating with pipe, this is because the curved shape of water tank wall 1 causes.
The cover pipe connections 15 ' of the special shape that will illustrate below needing in this case to use and the flexible traction piece 41 that constitutes by cable, fixed traction sleeve on this cable.
Fig. 6 illustrates cover pipe connections 15 ' with sectional view, and the general structure of this connector is similar to the structure of cover pipe connections 15 shown in Figure 4.
Yet this cover pipe connections 15 ' only has mate a 15 ' a who has the tooth zone to form by its flexible jacket 31 '.
The minor axis 20 ' of cover pipe connections comprises the lower part of its diameter greater than this minor axis top diameter, and flexible boot 31 ' is screwed on this minor axis by the lower part 31a ' of inner screw sheath.
The end portion of minor axis 20 ' comprises male thread portion 42, this threaded portion can make cover pipe connections 15 ' be connected on the following flexible drawing means 41 that will illustrate, the end adapter 21 ' and the check-valves 24 ' of the hydraulic fluid of carrying pressurization is installed in the end portion of this minor axis.
The making of the mate 15a ' of cover pipe connections 15 ' and shown in Figure 4ly show that the making of the mate 15a that overlaps pipe connections 15 and 15b is identical.This mate comprise expandable flexible boot 28 ' and cover pipe connections outside flexible metal cover 31 ' the tooth zone arranged.
Central passage 20 ' a in the cover pipe connections 15 ' minor axis 20 ' part is in the top closed by the safety device 39 ' of nut 40 ' fix in position.
To overlap pipe connections 15 ', to put into operation that the neutralization of pipe 5 ' position is clamped on wherein it identical with the chuckings operation of above-mentioned two cover pipe connections 15 basically.
After sleeve pipe connection individual 15 ' is located in the end parts of staying the section of a pipe 5 ' in the steam generator, to the hydraulic fluid that cover pipe connections 15 ' charges into pressurization the mate 15 ' a of cover pipe connections is expanded by the flexible conduit that is connected in adapter 21 ', this adapter 21 is fixed on the lower part of cover pipe connections 15 '.Mate 15 ' a of cover pipe connections 15 ' is pressurized to the pressure of 260 crust.This moment the stop solution hydraulic fluid pumping, thereby check-valves 24 ' is closed in the passage 20 ' a in the minor axis 20 ' under the pressure of 260 crust.
Drawing flexible conduit 12 ' (Fig. 5) then separates the flexible conduit of delivering hydraulic fluid and adapter 21 '.
The end of inciting somebody to action traction piece 41 as shown in Figure 8 subsequently is fastened on the threaded bottom 42 of cover pipe connections 15 '.
As shown in Figure 7, at connector in place and be released to it in section of a pipe 5 after, traction piece 41 is passed the traction fluid cylinder pressure, thereby takes out this section pipe 5, this hydraulic cylinder is placed on the position below the tube sheet 3, with the axial collimation of pipe 5 '.
The top splice 44 of traction piece 41 is by being screwed together in the threaded lower part of cover pipe connections 15 ', thereby can utilize cylinder 46 and its top of being bearing on tube sheet 3 lower surfaces to be connected in the traction piece 41 that overlaps pipe connections 15 ', on cover pipe connections 15 ', apply tractive force, take out pipe.
Shown in Fig. 9 and 9A, cylinder 46 comprises tubular type drawing head 47, and the wall of this drawing head is drilled with three axial grooves, utilizes horizontal pin 49 to install one in each groove and rotates finger 48.This rotation finger 48 can with elastic retraction means for example spring back into the inside of drawing head, promptly the axis to drawing head promotes.
After moving a segment distance, on the direction of returning corresponding to cylinder, finger can separate, so as can be placed on a new stop sleeve 45 above, utilize this sleeve that tractive force is sent on cable 43 and the cover pipe connections 15 '.
Can from tube sheet, take out this section pipe 5 ' step by step thus.
Make tractive force act on pipe and be fixed in the pulling force that the interior cover pipe connections 15 of this pipe can bear 35000 newton on 5 ', thus can be from tube sheet take-off pipe 5 '.
When this section pipe 5 ' has been moved to the inlet surface 3a of tube sheet 3 downwards, unclamp screw, the traction piece 41 and the bottom of cover pipe connections 15 ' are separated, thereby disconnect cover pipe connections 15.Flexible conduit with supplying hydraulic fluid is bonded on the bottom adapter of cover pipe connections 15 ' then, to the hydraulic fluid of cover pipe connections 15 discharge pressures greater than 400 crust, makes the membrane ruptures in the safety device 39 ' thus.
Draw off cover pipe connections 15 ' 5 afterwards from managing, continue to take out pipe with conventional draw-gear.
Finish the taking-up of the pipe of the periphery that has disconnected in transition region thus.
Therefore method of the present invention can be taken out the crackle part as detection of heat-exchange tube, the crackle of this pipe is not partly applied the stress of illeffects simultaneously, also can take out the pipe of the periphery that has split in transition region simultaneously.
Can carry out method of the present invention simply and fastly, this mainly is owing to make the cover pipe connections be located in the cause that operation and the operation of fully taking out pipe in the section of a pipe to be removed separate.
The embodiment that the invention is not restricted to illustrate.
Therefore for being located in the steam generator tube and staying cover pipe connections in this pipe and can find out and be different from the structure that has illustrated.
These cover pipe connections have one or two and are engaged on the inner zone of pipe, this depends on taking out for the first time operating period and is to use this connector to come bridge joint to make to measure cracked zone in the section of a pipe to be removed of usefulness, still be used for taking out one section pipe that is positioned on the tube sheet, for example the periphery pipe that has broken in transition region.
Claims (17)
1. one kind is taken out the section of a pipe method of (5,5 ') from heat exchanger, and the end of this pipe is crimped in the tube sheet (3,3 '), and method is characterised in that:
To overlap the end of pipe connections (15,15 ') by pipe is incorporated in the pipe (5,5 '), this connector comprises that having one at least has tooth chucking district (15a, 15b, 15 ' a, 15 ' b) tubular metal flexible boot (31,31 ') and make flexible boot (31 by conduit (12,12 ') supply pressure fluid, 31 ') device (26 of Peng Zhanging, 28,28 '), this cover pipe connections (15,15 ') be fixed on the pressure fluid delivery conduit end of (12,12 ');
The cover pipe connections is moved in pipe (5,5 '), be located in the section of a pipe to be extracted out (5,5 ') up to it;
The flexible boot (31,31 ') of cover pipe connections (15,15 ') is expanded, and making flexible boot (31,31 ') has the tooth district (15 ' a) is pressed against on the pipe inner surface of (5,5 ') by applied pressure for 15a, 15b;
Make flexible conduit (12,12 ') and be fixed in the pipe (5,5 ') locational cover pipe connections (15,15 ') and separate;
Apply tractive force on the section of a pipe (5,5 ') of fixed sleeving connector (15,15 ') therein, thereby from the tube sheet (3,3 ') of heat exchanger, take out this section pipe.
2. the method for claim 1, it is characterized in that, cover pipe connections (15, what 15 ') flexible metal cover (31) had that two axial lengths along this cover of cover pipe connections (15) separate certain distance has a tooth chucking district (15a, 15b), its feature also is, cover pipe connections (15) is located in the section of a pipe (5) that has a crackle (17) at least, (15a 15b) is configured in the have crackle both sides in section of a pipe (5) zone of (17) to make the tooth pinch zones that has of metal flexible cover (31) of cover pipe connections 15.
3. the method for claim 1, it is characterized in that, the metal flexible cover (31 ') of cover pipe connections (15 ') has a chucking district that tooth arranged, and (15 ' a), its feature also is, by cover pipe connections (15 ') tractive force is applied on this section pipe (5 '), thereby takes out this pipe.
4. method as claimed in claim 3 is under the situation of steam generator peripheral tube at pipe (5 '), it is characterized in that, by flexible traction piece (41) tractive force is acted on the sleeve connector.
5. one kind from taking out the section of a pipe device of (5,5 ') from heat exchanger, and the end of this pipe is crimped in the tube sheet (3,3 '), and this device comprises the device (50) of traction this section pipe (5,5 '), and it is characterized in that it also comprises:
Cover pipe connections (15,15 '), this connection comprises that having at least one on its outer surface has tooth chucking district (15a, 15b, 15 ' a) tubular flexible metal cover (31,31 ') and nibbling district (15a, 15b, 15 ' is radially expanded this flexible boot device of (26,28,28 ') on a), this device is by at least one flexible boot (26,28,28 ') constitute, this flexible boot is made of elastomeric material, with metal flexible cover (31,31 ') inner surface contacts, and constitutes chamber (32,34) simultaneously with the interior part (20) of overlapping pipe connections;
Be connected in the conduit (12,12 ') of cover pipe connections (15,15 ') to the one end of chamber (32,34) delivering hydraulic fluid.
6. device as claimed in claim 5, it is characterized in that, cover pipe connections (15,15 ') interior part (20,20 ') is made of minor axis, tubular flexible boot (26,28,28 ') be bonded on this minor axis, this minor axis has the axial passage (20a that one end thereof is connected in the conduit (12,12 ') of delivering hydraulic fluid along its length, 20 ' a) and at least one be connected in this axial passage (20a, 20 ' a) radial passage (33,35), and in flexible boot (26,28,28 ') and have a formation chamber (32,34) of that minor axis (20,20 ') of annular chamber.
7. device as claimed in claim 6 is characterized in that, (20a, 20 ' a) passes through check-valves (24,24 ') is connected in conduit (12,12 ') to the axial passage of cover pipe connections (15,15 ').
8. device as claimed in claim 7 is characterized in that, cover pipe connections (15,15 ') axial passage (20a, 20 ' a) an end is closed by safety device, this end be connected in conduit (12,12 ') and comprise that the end of check-valves (24,24 ') is relative.This safety device comprises barrier film, and (20a, 20 ' hydraulic fluid pressure in a) can break when surpassing predetermined value this barrier film at the passage of cover pipe connections.
9. as each described device in the claim 5～8, it is characterized in that, cover pipe connections (15,15 ') tubulose flexible metal cover (31,31 ') have two have the chucking district of nibbling (15a, 15b), these two chucking districts are along cover pipe connections (15, the axial direction of metal flexible 15 ') big (31,31 ') separates certain distance.
10. as each described device in the claim 5～8, it is characterized in that the flexible boot (31 ') of cover pipe connections (15 ') has a single tooth chucking district that has, and (15 ' a).
11., it is characterized in that cover pipe connections (15 as each described device in the claim 5～8,15 ') interior part (20,20 ') be included in the device (42) that one end thereof makes the device (41) of traction section of a pipe (5,5 ') be connected with cover pipe connections (15,15 ').
12. device as claimed in claim 11 is characterized in that, draw-gear is a kind of flexible apparatus, and this draw-gear has: cable, and an end that is fastened on the jack spare 44 on the cover pipe connections (15 ') is fixed on this cable; Traction sleeve (45), this sleeve pipe separates constant distance along length of warping winch; Traction cylinder (46), this cylinder comprises the drawing head with rotation finger (48), this finger will be to mesh with traction sleeve (45), so that tractive force is sent on the flexible cable (43) from cylinder along a direction of operating of cylinder (46), pass to again on the cover pipe connections (15 '), and this finger can be along second direction of operating of cylinder (46) from being locked in position transfer on first sleeve 45 to the position that is locked on second sleeve (45), and the stroke of cylinder (46) equals the constant distance between the sleeve that is fixed in flexible cable (43) (45) at least.
13. as each described device in the claim 5～8, it is characterized in that, cover pipe connections (15,15 ') tubular metal flexible boot (31,31 ') (15 ' a) comprises many vertical slits (18) for 15a, 15b in the chucking district that tooth is arranged, have indention tubulose flexible metal cover (31,31 ') but the deformation district be the boundary with this slit.
14., it is characterized in that this device comprises roller pull-push piece 9 as each described device in the claim 5～8, the conduit of being done by flexible pipe (12,12 ') of this pull-push piece and delivering hydraulic fluid collimates, so that will overlap pipe connections (15,15 ') send in the pipe (5,5 ').
15. as each described device in the claim 5～8, it is characterized in that, the conduit (12 of delivering hydraulic fluid, 12 ') one of them engaged at end is on the axial end portion of part (20,20 ') in the cover pipe connections (15,15 '), make and utilize traction fluid hydraulic fluid delivery conduit (12 simply, 12 ') method just can make this conduit, and (15,15 ' separates with being stuck in cover pipe connections in the pipe (5,5 ').
16. use as each described method in the claim 1 to 4 or as each described device in the claim 5 to 15, section of a pipe (5 is taken out from the tube sheet (3) of setting-out steam generator in the inboard that this method or device are used for by water tank (2), 5 '), the pipe of steam generator (5,5 ') end enters this water tank (2) in the inlet surface (3a) of tube sheet (3).
17. use as claimed in claim 16 is characterized in that, pipe (5,5 ') enters water tank (2) in the outer peripheral areas of tube sheet (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97103490 CN1164017A (en) | 1996-03-19 | 1997-03-18 | Method and device for extracting section of tube from heat exchanger and use of method and of device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9603408 | 1996-03-19 | ||
| CN 97103490 CN1164017A (en) | 1996-03-19 | 1997-03-18 | Method and device for extracting section of tube from heat exchanger and use of method and of device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1164017A true CN1164017A (en) | 1997-11-05 |
Family
ID=5166678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97103490 Pending CN1164017A (en) | 1996-03-19 | 1997-03-18 | Method and device for extracting section of tube from heat exchanger and use of method and of device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1164017A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103111844A (en) * | 2013-02-05 | 2013-05-22 | 郝新浦 | Device and technology used in condenser fin group pipe penetrating working procedure |
| CN103707257A (en) * | 2012-09-29 | 2014-04-09 | 哈尔滨天泰科技有限公司 | Elastic jacketed pipe extractor |
| CN107414447A (en) * | 2017-08-18 | 2017-12-01 | 厦门艾斯霖橡塑科技有限公司 | It is a kind of to be used for the installation equipment that becket is installed in pipe muffler |
| CN107756003A (en) * | 2016-08-23 | 2018-03-06 | 中国石油天然气股份有限公司 | A kind of pipe lining draw-off gear |
-
1997
- 1997-03-18 CN CN 97103490 patent/CN1164017A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103707257A (en) * | 2012-09-29 | 2014-04-09 | 哈尔滨天泰科技有限公司 | Elastic jacketed pipe extractor |
| CN103111844A (en) * | 2013-02-05 | 2013-05-22 | 郝新浦 | Device and technology used in condenser fin group pipe penetrating working procedure |
| CN103111844B (en) * | 2013-02-05 | 2015-04-22 | 郝新浦 | Device and technology used in condenser fin group pipe penetrating working procedure |
| CN107756003A (en) * | 2016-08-23 | 2018-03-06 | 中国石油天然气股份有限公司 | A kind of pipe lining draw-off gear |
| CN107756003B (en) * | 2016-08-23 | 2019-05-07 | 中国石油天然气股份有限公司 | A kind of pipe lining draw-off gear |
| CN107414447A (en) * | 2017-08-18 | 2017-12-01 | 厦门艾斯霖橡塑科技有限公司 | It is a kind of to be used for the installation equipment that becket is installed in pipe muffler |
| CN107414447B (en) * | 2017-08-18 | 2019-02-05 | 厦门艾斯霖橡塑科技有限公司 | A kind of installation equipment installed for becket in pipe muffler |
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