CA1239844A - Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller size - Google Patents
Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller sizeInfo
- Publication number
- CA1239844A CA1239844A CA000466805A CA466805A CA1239844A CA 1239844 A CA1239844 A CA 1239844A CA 000466805 A CA000466805 A CA 000466805A CA 466805 A CA466805 A CA 466805A CA 1239844 A CA1239844 A CA 1239844A
- Authority
- CA
- Canada
- Prior art keywords
- panels
- panel
- obturation
- passage
- support collar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D1/00—Details of nuclear power plant
- G21D1/02—Arrangements of auxiliary equipment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J13/00—Covers or similar closure members for pressure vessels in general
- F16J13/02—Detachable closure members; Means for tightening closures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/22—Drums; Headers; Accessories therefor
- F22B37/221—Covers for drums, collectors, manholes or the like
- F22B37/222—Nozzle dams introduced through a smaller manway, e.g. foldable
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Plasma & Fusion (AREA)
- High Energy & Nuclear Physics (AREA)
- Pressure Vessels And Lids Thereof (AREA)
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
- Hinges (AREA)
- Tents Or Canopies (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
The invention relates to a temporary sealing obturation panel, inside a vessel accessible only through a manhole, of a passage provided on its periphery with a support collar. It is constituted by: panels articulated by flexible fluid-tight hinges, bordered by lines of latching pins, stiffeners comprising lines of holes con-jugate with the lines of pins, a frame in at least two articulated parts, with means for gripping the ends of the panels and the stiffeners against the support collar.
The invention is applicable to the closing of primary circuit ducts opening into the water box of a steam gener-ator of a pressurized water nuclear boiler.
The invention relates to a temporary sealing obturation panel, inside a vessel accessible only through a manhole, of a passage provided on its periphery with a support collar. It is constituted by: panels articulated by flexible fluid-tight hinges, bordered by lines of latching pins, stiffeners comprising lines of holes con-jugate with the lines of pins, a frame in at least two articulated parts, with means for gripping the ends of the panels and the stiffeners against the support collar.
The invention is applicable to the closing of primary circuit ducts opening into the water box of a steam gener-ator of a pressurized water nuclear boiler.
Description
:~23~
TE;~IPOI~ Y OBTl ~.\TIO~I P~\~ll.L OF ~ PAS;~\G~ INSIOl~ A VE~S~L
!(~C~:iSI~L~ ONL~ T~IRU A~ ORIFICE OF Sl~IALLER SIZI~
FIELU OF rllE I~VE.~TION
The present invention relates to a panel for 5 thc tcmporary fluid-tight obturation of a passage insicle a vesscl accessible only throu~h an orifice of din1ensior1s less than those of the passaoe to he closed. The invention finds a particularly efEective use for the temporary closure of the junction aperture on the water box of 10 a steam rrenerator, of a duct of the primary circuit of a pressurized water nuclear reactor.
In a nuclear reactor the pressurized water of the primary circuit flows between the reactor proper ~rhere, in contact with fuel elements it absorbs the heat 15 resultinlr from the nuclear reactions, and a steam generator where this heat is used to produce the steam then directed to the turbo-alterr~ator units if the reactor is used in a nuclear electric ity generating sta-tion.
The stearn ~,enerator is generally constituted 20 by a bundl e of U- tubes mounted on a t u b e plate with a hemispherical ~/ater box divided into two by a partition separating two chambers; the water coming eron1 the tank of the reactor en-ters one of the chambers, traverses the U tubes and is collected in the o-ther cnarnber whence 25 it is pumped to be sent to the reactor. The junction apertures of the primary circuit on the chambers of the water box are of relatively large size, of tlle order, for example, of a meter in diameter.
It is periodically necessary to have access 30 inside the two chambers of the water box, for example, for operations of checking and maintenance. There is - therefore provided an access aperture, but since the prilnary fluid is under considerable pressure, i-t is pre-ferred to cr i ve the access aperture as small a cross-section 35 as possih1e, of the order of 400 mm, th~t is to say ot`
a diameter normally just -.ur- i cient; ror t~le passa.,e of a inan ?rovided with a protective combination.
During such operations the f lo-~ of pr irrlar y ~:luid is normall~ stoppe(! and the steam ~r~enerator chanlbers ~2~
are empty. It is however necessary to close -the apertures thrours~ hictl -the -Eloh~ pipes for the primary fluid eom-murlicate, first for psycholorical reasons, asthe operator can r`ear fallin~ islto this yawnin~r aperture, an~s then for safety reasons to prevent an inadver-tent arrival of water in the chambers at the bottolll of the generator.
PI~I01~ ART
French patent no. 76-03456, of Applicant, describes an emsbo(liment of suctl an obturation panel enablin~r both its introduction into elements separated by the small cross~ectionaccess nlanhole, its rapid positionin~ on a support collar surrounAing the aperture, and its rapicl fixin~ by screwing to the support collar. Such a device is however only capable of supporting hy~lrostatic pressures l; slightly higher than one bar, correspondin~ to the water hei~rtlt of the pool of the reac-tor.
_ In addition the eontinuous wi sh t o i mp ro ve the operating conditions in a contaminated medium leads to proceeding with deeontamination operations. 'snhe developmen-t of the e~remieal teehniques of decontamination of the constituents of the primary eireuit of pressuri~ed water reactors has enabled these operations to be carried out with the aid of a rea~ent highly diluted in water and brought to a -temperature o-f abou-t 135C which corres-ponds to a saturation pressure slightly greater than3 bars absolute of the liquid contained in the chambers of the water box. In aAdsition when the operation of ~econtamination must be carried out in the tuhe bun~le, it is necessary, to avoicl any vaporization phenorllerlon, 3o to subject -the liquid to an excess pressure of about O . S ba r .
Durinfr operations Oe decontasnination the ob-turators of -the apertures of the primary circuit are then ;ntende(l to isolate the f,renerator whiell is a-t an 3~ overprcssure of as70llt 3.`~ bals on ts-le wclter^ boY side surfaee. There rr-ust also be adcle(l a s tren~(rt h coei`r`icient to the hydraulic testin~ proce(lures wh; ch ean lead to sl1bjeetin~ the obturators to ei~ective preàsures e-xcee~ir 5 bilrs.
~3~8~(~
rO be a'~le to satisfy such restrictions the prior clevices .such as describecl by French patent no. 7is-o3~56 must include consti.tuent elements largely e~cee(ling the ~ei~lht o~ 25 daN generally allow~l or rapid mallipulations.
~U~ Y 0~ T~IE INV~TI0~
It is thérefore an object of the present invention to provide a ne~ solution to the problem of the rapicl po~sitionirl~ of an obturation panel introduced into a vessel through an aperture of smaIl si~e, and this by limitin~r the wei~ht of the elements to be introduced separately and successively into the vessel.
The invention therefore applies to a temporary fluid-tight obturation panel of a passage inside an enclosure accessible only througll an aperture of diinensions less than those of the passage to obturated, the periphery of the passage to be obturatecl including a support collar provided with threai.led bores. According to the irlvention, the panel is constituted by: :-~ at least two panels hin~ed -to one another by fle~ible fluid-tigllt h:inges, the.size and the number of the panels beinO determined -to permit the passage through -the access aperture o f t h e set o panels folde~ on one ano-ther, eacEI panel comprisincr along its articulated edges a series of latching pins, - a set of stiffeners equal in number to that of -the hinrres of the panel, each stiffener comprising two lines of holes conjugate w:ith the lines of latchin~r pins of two contiguous panels, -a frame in at least two parts art:iculated and foldable on one another, reprodllcing in unfolded position -the contour oE the suppor-t collar and comprising means to gri.p, with tl-le interposition of a seal, -the ends oE the panels and stiffeners against the support collar, by scre-~ing into t;he threa~le~l bores-.~ccor(lirlg to a preferred embodiment oE theinvention the panels arc con.stit-ltec~ ot light metil all.oy coatecl~it'i- carhon fiber boncled witrl resin, and the flexible hinges are forned of a corro.~iorl-resistant ela.,tomer.
4 ~239844 ~RIEF l)ESCRIPTI0~' OF T~IE 3Ri~l~IN~S
The invention will bc better understood with rcferellce to a particular embodi:nent shown in the accom-panyin~ drawin~s, this embodiment bein~ given purely ; by way of examp]e in an application to the obturation of the junction aperture of the primary circuit of a nuclear reactor on the water box of a steam grenerator.
Figure 1 is a limited view from above, with partial sections of an obturator in positi,on on the support collar of the aperture.
Fi~rure 2 is a section along the line II-II of Fi~ure 1.
~ igrllre 3 shows on a lar~er scale the detail of the assernbly of a stiffener on the obturator, alon~r the line III-III of Fi~rure 1.
Fi~ure 4 shows the detail of the fastening of the end of a stiffener and of a panel on the support collar, along the line IV-IV of Figure 1.
Fi~ure 5 shows the articulation of the fastening frarne along the line V-V of Figure 1.
Figure 6 shows the panels in folded position for their passage through the aperturefor access to the vessel.
DETAILED DESCRIPTI0~
If reference is first made to the set of Fii~ures 1, 2 and 3 it will be seen that the periphery of aperture 1 to be closed is provided with an annular supporting collar 2 welded to the wall 3 of the vessel;
the collar 2 comprises a series of threaded bores 4.
The obturator proper is here formed of three panels 5, 6 and 7, each constituted by a honeycomb struc-ture 9 of light metal, i,tself coated with a layer 10 of compositc materials of carbon fihers bonded by a resin.
The panels are joined to~ether by a strip 11 3i of olasto~fr overrilo1ded onto the ,ncirallel edges of the panf?ls opposite each other, as carl be seell better in Fi~ure 3 on a 1arger scale. Thc strips 11 thus rorm a rle~ible but sealing hingre between the panels 5 and 6 ~23~
on tl~e one har1d an(l 6 and / on thc? o-ther hancl. The mee7laTlieal strerllrt71 o~ tlle hincres i.s rc~inforeed, on eaeh surface of the panels, hy strips 12 t`ormin~ but-t-plates, themselves o~ carboI1 fiber-resin eomposite material, anc1 fixecl to the panels by screws 13 and nuts 14. The head of the serews 13 is e~tenclecl bylatehing pins 15 oi` mus7lroom shape projecting at regular intervals in line alon~ the articulateded~es of the panel.
Each panel 5, c), 7 is ealculated ancl climensioned to be able, in i.tself, to withstand the operational or test pressures. To ensure rigidity in serviee of the flexiblc hinges 11 the deviee eomprises separate stiffenin~
girc1er3 17, rlesic,ned to be positioned on the hinges. The girclers 17 are eonsti-tuted by two webs of stainless steel 18 welded -to two sill plates 19 and 20. The sill plate 19 is eut c~ut to form openings in -the form of hooks 21 whieh, 7 y a slicaht lon~ituclinal movement, eome into gripping relationship beneat}1 the heads of the latehing pins 15, so as to loek in the same flat ali~nment the two ecl~res of the two conti~uous panel.s and so as to earry baek onto the gir de r un it 17 the forees whieh would terid to eause -the ar-tieulation 11 to fold. It will also be observecl that through the over-lappin~ heads of -the pins 15 the transfer of the forees
TE;~IPOI~ Y OBTl ~.\TIO~I P~\~ll.L OF ~ PAS;~\G~ INSIOl~ A VE~S~L
!(~C~:iSI~L~ ONL~ T~IRU A~ ORIFICE OF Sl~IALLER SIZI~
FIELU OF rllE I~VE.~TION
The present invention relates to a panel for 5 thc tcmporary fluid-tight obturation of a passage insicle a vesscl accessible only throu~h an orifice of din1ensior1s less than those of the passaoe to he closed. The invention finds a particularly efEective use for the temporary closure of the junction aperture on the water box of 10 a steam rrenerator, of a duct of the primary circuit of a pressurized water nuclear reactor.
In a nuclear reactor the pressurized water of the primary circuit flows between the reactor proper ~rhere, in contact with fuel elements it absorbs the heat 15 resultinlr from the nuclear reactions, and a steam generator where this heat is used to produce the steam then directed to the turbo-alterr~ator units if the reactor is used in a nuclear electric ity generating sta-tion.
The stearn ~,enerator is generally constituted 20 by a bundl e of U- tubes mounted on a t u b e plate with a hemispherical ~/ater box divided into two by a partition separating two chambers; the water coming eron1 the tank of the reactor en-ters one of the chambers, traverses the U tubes and is collected in the o-ther cnarnber whence 25 it is pumped to be sent to the reactor. The junction apertures of the primary circuit on the chambers of the water box are of relatively large size, of tlle order, for example, of a meter in diameter.
It is periodically necessary to have access 30 inside the two chambers of the water box, for example, for operations of checking and maintenance. There is - therefore provided an access aperture, but since the prilnary fluid is under considerable pressure, i-t is pre-ferred to cr i ve the access aperture as small a cross-section 35 as possih1e, of the order of 400 mm, th~t is to say ot`
a diameter normally just -.ur- i cient; ror t~le passa.,e of a inan ?rovided with a protective combination.
During such operations the f lo-~ of pr irrlar y ~:luid is normall~ stoppe(! and the steam ~r~enerator chanlbers ~2~
are empty. It is however necessary to close -the apertures thrours~ hictl -the -Eloh~ pipes for the primary fluid eom-murlicate, first for psycholorical reasons, asthe operator can r`ear fallin~ islto this yawnin~r aperture, an~s then for safety reasons to prevent an inadver-tent arrival of water in the chambers at the bottolll of the generator.
PI~I01~ ART
French patent no. 76-03456, of Applicant, describes an emsbo(liment of suctl an obturation panel enablin~r both its introduction into elements separated by the small cross~ectionaccess nlanhole, its rapid positionin~ on a support collar surrounAing the aperture, and its rapicl fixin~ by screwing to the support collar. Such a device is however only capable of supporting hy~lrostatic pressures l; slightly higher than one bar, correspondin~ to the water hei~rtlt of the pool of the reac-tor.
_ In addition the eontinuous wi sh t o i mp ro ve the operating conditions in a contaminated medium leads to proceeding with deeontamination operations. 'snhe developmen-t of the e~remieal teehniques of decontamination of the constituents of the primary eireuit of pressuri~ed water reactors has enabled these operations to be carried out with the aid of a rea~ent highly diluted in water and brought to a -temperature o-f abou-t 135C which corres-ponds to a saturation pressure slightly greater than3 bars absolute of the liquid contained in the chambers of the water box. In aAdsition when the operation of ~econtamination must be carried out in the tuhe bun~le, it is necessary, to avoicl any vaporization phenorllerlon, 3o to subject -the liquid to an excess pressure of about O . S ba r .
Durinfr operations Oe decontasnination the ob-turators of -the apertures of the primary circuit are then ;ntende(l to isolate the f,renerator whiell is a-t an 3~ overprcssure of as70llt 3.`~ bals on ts-le wclter^ boY side surfaee. There rr-ust also be adcle(l a s tren~(rt h coei`r`icient to the hydraulic testin~ proce(lures wh; ch ean lead to sl1bjeetin~ the obturators to ei~ective preàsures e-xcee~ir 5 bilrs.
~3~8~(~
rO be a'~le to satisfy such restrictions the prior clevices .such as describecl by French patent no. 7is-o3~56 must include consti.tuent elements largely e~cee(ling the ~ei~lht o~ 25 daN generally allow~l or rapid mallipulations.
~U~ Y 0~ T~IE INV~TI0~
It is thérefore an object of the present invention to provide a ne~ solution to the problem of the rapicl po~sitionirl~ of an obturation panel introduced into a vessel through an aperture of smaIl si~e, and this by limitin~r the wei~ht of the elements to be introduced separately and successively into the vessel.
The invention therefore applies to a temporary fluid-tight obturation panel of a passage inside an enclosure accessible only througll an aperture of diinensions less than those of the passage to obturated, the periphery of the passage to be obturatecl including a support collar provided with threai.led bores. According to the irlvention, the panel is constituted by: :-~ at least two panels hin~ed -to one another by fle~ible fluid-tigllt h:inges, the.size and the number of the panels beinO determined -to permit the passage through -the access aperture o f t h e set o panels folde~ on one ano-ther, eacEI panel comprisincr along its articulated edges a series of latching pins, - a set of stiffeners equal in number to that of -the hinrres of the panel, each stiffener comprising two lines of holes conjugate w:ith the lines of latchin~r pins of two contiguous panels, -a frame in at least two parts art:iculated and foldable on one another, reprodllcing in unfolded position -the contour oE the suppor-t collar and comprising means to gri.p, with tl-le interposition of a seal, -the ends oE the panels and stiffeners against the support collar, by scre-~ing into t;he threa~le~l bores-.~ccor(lirlg to a preferred embodiment oE theinvention the panels arc con.stit-ltec~ ot light metil all.oy coatecl~it'i- carhon fiber boncled witrl resin, and the flexible hinges are forned of a corro.~iorl-resistant ela.,tomer.
4 ~239844 ~RIEF l)ESCRIPTI0~' OF T~IE 3Ri~l~IN~S
The invention will bc better understood with rcferellce to a particular embodi:nent shown in the accom-panyin~ drawin~s, this embodiment bein~ given purely ; by way of examp]e in an application to the obturation of the junction aperture of the primary circuit of a nuclear reactor on the water box of a steam grenerator.
Figure 1 is a limited view from above, with partial sections of an obturator in positi,on on the support collar of the aperture.
Fi~rure 2 is a section along the line II-II of Fi~ure 1.
~ igrllre 3 shows on a lar~er scale the detail of the assernbly of a stiffener on the obturator, alon~r the line III-III of Fi~rure 1.
Fi~ure 4 shows the detail of the fastening of the end of a stiffener and of a panel on the support collar, along the line IV-IV of Figure 1.
Fi~ure 5 shows the articulation of the fastening frarne along the line V-V of Figure 1.
Figure 6 shows the panels in folded position for their passage through the aperturefor access to the vessel.
DETAILED DESCRIPTI0~
If reference is first made to the set of Fii~ures 1, 2 and 3 it will be seen that the periphery of aperture 1 to be closed is provided with an annular supporting collar 2 welded to the wall 3 of the vessel;
the collar 2 comprises a series of threaded bores 4.
The obturator proper is here formed of three panels 5, 6 and 7, each constituted by a honeycomb struc-ture 9 of light metal, i,tself coated with a layer 10 of compositc materials of carbon fihers bonded by a resin.
The panels are joined to~ether by a strip 11 3i of olasto~fr overrilo1ded onto the ,ncirallel edges of the panf?ls opposite each other, as carl be seell better in Fi~ure 3 on a 1arger scale. Thc strips 11 thus rorm a rle~ible but sealing hingre between the panels 5 and 6 ~23~
on tl~e one har1d an(l 6 and / on thc? o-ther hancl. The mee7laTlieal strerllrt71 o~ tlle hincres i.s rc~inforeed, on eaeh surface of the panels, hy strips 12 t`ormin~ but-t-plates, themselves o~ carboI1 fiber-resin eomposite material, anc1 fixecl to the panels by screws 13 and nuts 14. The head of the serews 13 is e~tenclecl bylatehing pins 15 oi` mus7lroom shape projecting at regular intervals in line alon~ the articulateded~es of the panel.
Each panel 5, c), 7 is ealculated ancl climensioned to be able, in i.tself, to withstand the operational or test pressures. To ensure rigidity in serviee of the flexiblc hinges 11 the deviee eomprises separate stiffenin~
girc1er3 17, rlesic,ned to be positioned on the hinges. The girclers 17 are eonsti-tuted by two webs of stainless steel 18 welded -to two sill plates 19 and 20. The sill plate 19 is eut c~ut to form openings in -the form of hooks 21 whieh, 7 y a slicaht lon~ituclinal movement, eome into gripping relationship beneat}1 the heads of the latehing pins 15, so as to loek in the same flat ali~nment the two ecl~res of the two conti~uous panel.s and so as to earry baek onto the gir de r un it 17 the forees whieh would terid to eause -the ar-tieulation 11 to fold. It will also be observecl that through the over-lappin~ heads of -the pins 15 the transfer of the forees
2; to the girder 17 is exerteci in the same manner ~hen pressure is applied to one or other surfaee of the panels.
The set of deviees is eompleted by a erown 22, here eireular, eonstituted of two portions artieula-ted along a cliametrie axis 23 (Ficrure 5), so as to permit eaeh half-erown to fold baek onto the other along the arrow 24.
Proeeclure will be as follol~s for the ~ositioning of the obturator on the support eollar 2 of the aper-tllre to be el.ose(1. The eonstituent elements of the obturator are first introdueecl insicie the ehamber of the water box througtl the marlrlole or` ,mall ciiameter 26 (Fi~ure6j The reetilillear girciers 17 are .introcluced as sueh, w71il.st the erown 22 i.s introcll1ecd iithout diffieulty once folcied on itself ;.nto a hall ri.na o~ small cross-seetiorl. The 6 ~3~
thrc?e arti.clllatecl pane1a are also foldeci back on one another around thc flexible h:in(rc?s 11, an(l it is sf,?en in Fi~ure 6 -that their aasem~ly then presents a suff:iciently rf.?dl1cf?d hullc to pass througil the manhole 26 without cii~icu]ty.
The operator havir1~r himself entere~ the water box, it is su~ic:ient l~or him to unEol.d tlle pane~s and to posi-tion them on the collar 2, the opera-tion beillg facilitated by centering s-tuds 27 fast to the panels;
the ri,(ridity itself of the panels is sufficient for thc unit to remain :in place in the al~sencè of pressurc on one or other surface.
~ fter unfolding the crown 22 can then be placed in position to ~rrip -the ed~res of -the panels a~ra:inst the l; girdcr 2 by means of scre~Ys 29 engaged in the threaded holes ~. The fluid-tightness of the assembly is ensurecl, af-ter final tightening of the screws 29, by seals 30 arran~ec1 a-t-the periphery of the group of panels.
Then the girclers 17 will be berthed in the acis of the hinges 11, in a position where the pins 15 are freed from the hooks 21. This is possible by means oE the discontinuity of the extension 31 of the sill plate 19, ~Yhich forms a longi-tudinal play 32 at each end of the girder 17. Before appl.ying the girder 17 2~ the shaped sectional el.ement of elastomer 34 will have been folded baclc against the strip 11 which shaped elemc?n-t ls intendecl to provide a supportin~ collar on the hinge strip 11.
Previously, in order not to impede the handlirlg of -the parlels and -their L'olding, the shaped element 3~ w as held spaced by-,links 3~ buttoned -to fasteners 36. In Figure 6 and in the left portion ot' Figures 1 and 2 are seen the shaped elements 34 in waiting position; in Figure 3 and in the rig}lt-hand portion of Figure 1 are seen on the other hclncl, the shapec] elements 34 in sup~)ort;.nlg
The set of deviees is eompleted by a erown 22, here eireular, eonstituted of two portions artieula-ted along a cliametrie axis 23 (Ficrure 5), so as to permit eaeh half-erown to fold baek onto the other along the arrow 24.
Proeeclure will be as follol~s for the ~ositioning of the obturator on the support eollar 2 of the aper-tllre to be el.ose(1. The eonstituent elements of the obturator are first introdueecl insicie the ehamber of the water box througtl the marlrlole or` ,mall ciiameter 26 (Fi~ure6j The reetilillear girciers 17 are .introcluced as sueh, w71il.st the erown 22 i.s introcll1ecd iithout diffieulty once folcied on itself ;.nto a hall ri.na o~ small cross-seetiorl. The 6 ~3~
thrc?e arti.clllatecl pane1a are also foldeci back on one another around thc flexible h:in(rc?s 11, an(l it is sf,?en in Fi~ure 6 -that their aasem~ly then presents a suff:iciently rf.?dl1cf?d hullc to pass througil the manhole 26 without cii~icu]ty.
The operator havir1~r himself entere~ the water box, it is su~ic:ient l~or him to unEol.d tlle pane~s and to posi-tion them on the collar 2, the opera-tion beillg facilitated by centering s-tuds 27 fast to the panels;
the ri,(ridity itself of the panels is sufficient for thc unit to remain :in place in the al~sencè of pressurc on one or other surface.
~ fter unfolding the crown 22 can then be placed in position to ~rrip -the ed~res of -the panels a~ra:inst the l; girdcr 2 by means of scre~Ys 29 engaged in the threaded holes ~. The fluid-tightness of the assembly is ensurecl, af-ter final tightening of the screws 29, by seals 30 arran~ec1 a-t-the periphery of the group of panels.
Then the girclers 17 will be berthed in the acis of the hinges 11, in a position where the pins 15 are freed from the hooks 21. This is possible by means oE the discontinuity of the extension 31 of the sill plate 19, ~Yhich forms a longi-tudinal play 32 at each end of the girder 17. Before appl.ying the girder 17 2~ the shaped sectional el.ement of elastomer 34 will have been folded baclc against the strip 11 which shaped elemc?n-t ls intendecl to provide a supportin~ collar on the hinge strip 11.
Previously, in order not to impede the handlirlg of -the parlels and -their L'olding, the shaped element 3~ w as held spaced by-,links 3~ buttoned -to fasteners 36. In Figure 6 and in the left portion ot' Figures 1 and 2 are seen the shaped elements 34 in waiting position; in Figure 3 and in the rig}lt-hand portion of Figure 1 are seen on the other hclncl, the shapec] elements 34 in sup~)ort;.nlg
3; position of -the flexible hir1ge ll.
Jy a lon~;.tuclLnal thrust or` the ~rircler 17 t-.hf*
twc) ro~is o~' ?ina 1,~ are then brough-t to ~rrip ~hf.? cwo rows oE lcltclleà ~ hf? ~rirders l7, thus Eastf?necl Wit;ll the ~anels ~iith loclc:in~r of the ~lexi~)lf? hinges 11, can then be in t~lcir -turn fi~ed to the crown 22 anct the collar 2 b sclews 37 ~hich ensure at the same time, as is seen in ~i~ure 4, support o the girders 17 and the tightening of the fluid-ti-rht seal 30.
Of course the invention is not strictly limited to the emhod;ment which has been descrined by way of eYample, bl1t it also covers constructions ~hich onlv differ therefrom in detail, in modifica-tions of execl1tion or in the use of equivalent means. Thus it must not be lin~ited to the obturation of c:ircular apertures, since it applies in the same way to the obturation of passages of any shape, and for example rectangular, ~he n-eve r obturation must be formed within a vessel acces-sible only through an aperture of dimensions less -than those of the passa~e to be obturated. The number and si~e of the panels will then be determined so as to be able to introduce the folded assembly through the access apcrture and of` course as many stiffening ~rirders as articulations will then be provided. In the sarne ~ay the clampin~ frame could also include several articulations, enabling it -to be folded sufficiently to permit its passa~e through the access aperture.
In the same way, -the support elements 34 could, as a modi~ication, be bonded permanentlybeneath the sill plate 19 o~ the stiffening girders 17.
Jy a lon~;.tuclLnal thrust or` the ~rircler 17 t-.hf*
twc) ro~is o~' ?ina 1,~ are then brough-t to ~rrip ~hf.? cwo rows oE lcltclleà ~ hf? ~rirders l7, thus Eastf?necl Wit;ll the ~anels ~iith loclc:in~r of the ~lexi~)lf? hinges 11, can then be in t~lcir -turn fi~ed to the crown 22 anct the collar 2 b sclews 37 ~hich ensure at the same time, as is seen in ~i~ure 4, support o the girders 17 and the tightening of the fluid-ti-rht seal 30.
Of course the invention is not strictly limited to the emhod;ment which has been descrined by way of eYample, bl1t it also covers constructions ~hich onlv differ therefrom in detail, in modifica-tions of execl1tion or in the use of equivalent means. Thus it must not be lin~ited to the obturation of c:ircular apertures, since it applies in the same way to the obturation of passages of any shape, and for example rectangular, ~he n-eve r obturation must be formed within a vessel acces-sible only through an aperture of dimensions less -than those of the passa~e to be obturated. The number and si~e of the panels will then be determined so as to be able to introduce the folded assembly through the access apcrture and of` course as many stiffening ~rirders as articulations will then be provided. In the sarne ~ay the clampin~ frame could also include several articulations, enabling it -to be folded sufficiently to permit its passa~e through the access aperture.
In the same way, -the support elements 34 could, as a modi~ication, be bonded permanentlybeneath the sill plate 19 o~ the stiffening girders 17.
Claims (4)
1. Temporary fluid-tight obturation panel for a passage into a vessel accessible only through an aperture of dimensions less than those of the passage to be obturated, the periphery of the passage to be closed comprising a support collar provided with threaded holes, said obturation panel being constituted by:
- at least two panels articulated together by flexible fluid-tight hinges, the size and number of panels being determined to enable passage through the access aperture of the set of panels folded on one another, each panel comprising along its articulated edges a series of latching pins, - a set of stiffeners equal in number to that of the hinges of the panel, each stiffener comprising two lines of holes conjugate with the lines of the latching pins of two contiguous panels, - a frame in at least two parts articulated and foldable on one another, reproducing in folded position the contour of the support collar and comprising means to grip, with the interposition of a seal, the ends of the panels and of the stiffeners against the support collar, by screwing into the threaded holes.
- at least two panels articulated together by flexible fluid-tight hinges, the size and number of panels being determined to enable passage through the access aperture of the set of panels folded on one another, each panel comprising along its articulated edges a series of latching pins, - a set of stiffeners equal in number to that of the hinges of the panel, each stiffener comprising two lines of holes conjugate with the lines of the latching pins of two contiguous panels, - a frame in at least two parts articulated and foldable on one another, reproducing in folded position the contour of the support collar and comprising means to grip, with the interposition of a seal, the ends of the panels and of the stiffeners against the support collar, by screwing into the threaded holes.
2. Obturation panel according to claim 1, wherein the panels are constituted of light metallic alloy coated with carbon fibers bonded by resin.
3. Obturation panel according to claim 1, wherein the flexible hinges are formed of corrosion-resistant elastomer.
4. Obturation panel according to claim 1, 2 or 3, comprising, associated with each hinge, a supporting sectional element interposed between the flexible hinge and the corresponding stiffener.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8317391 | 1983-11-02 | ||
| FR8317391A FR2554208B1 (en) | 1983-11-02 | 1983-11-02 | PROVISIONAL SHUTTERING PANEL FOR A PASSAGE INSIDE AN ENCLOSURE ACCESSIBLE ONLY THROUGH A SMALLER SIZE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1239844A true CA1239844A (en) | 1988-08-02 |
Family
ID=9293703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000466805A Expired CA1239844A (en) | 1983-11-02 | 1984-11-01 | Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller size |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | USRE32832E (en) |
| EP (1) | EP0141738B1 (en) |
| JP (1) | JPS60138304A (en) |
| KR (1) | KR910000921B1 (en) |
| CA (1) | CA1239844A (en) |
| DE (1) | DE3462826D1 (en) |
| ES (1) | ES282372Y (en) |
| FR (1) | FR2554208B1 (en) |
| YU (1) | YU185184A (en) |
| ZA (1) | ZA848529B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2585101B1 (en) * | 1985-07-16 | 1987-11-27 | Framatome Sa | REMOVABLE SHUTTER FOR ORIFICE ACCESSIBLE ONLY THROUGH A NARROW PASS |
| EP0213024B1 (en) * | 1985-08-09 | 1989-07-12 | Framatome | Device for placing and holding a cover for an opening inside a vessel |
| FR2595668B1 (en) * | 1986-03-17 | 1988-06-03 | Bertin & Cie | DEVICE FOR SHUTTERING AN ORIFICE WITHIN AN ENCLOSURE ACCESSIBLE ONLY BY ANOTHER ORIFICE OF DIMENSIONS LESS THAN THOSE OF THE ORIFICE TO BE CLOSED |
| US4850600A (en) * | 1987-11-05 | 1989-07-25 | Siemens Aktiengesellschaft | Sealing device for pipe connectors discharging into a vessel, in particular a steam generator |
| DE10014309C1 (en) * | 2000-03-23 | 2001-07-19 | Siemens Ag | Temporary pipe closure device e.g. for nuclear reactor pressure vessel testing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2306947C2 (en) * | 1973-02-13 | 1974-08-15 | Siempelkamp Giesserei Kg, 4150 Krefeld | Prestressed pressure vessel for nuclear reactors |
| US3926722A (en) * | 1973-06-29 | 1975-12-16 | Combustion Eng | Reactor vessel head support arrangement |
| FR2340489A1 (en) * | 1976-02-09 | 1977-09-02 | Framatome Sa | Temporary cover plate for large duct openings - has hinged plate with rectangular access hole and door |
| FR2415515A1 (en) * | 1978-01-30 | 1979-08-24 | Framatome Sa | REMOTE CONTROLLED SCREWING DEVICE |
-
1983
- 1983-11-02 FR FR8317391A patent/FR2554208B1/en not_active Expired
-
1984
- 1984-10-30 DE DE8484402177T patent/DE3462826D1/en not_active Expired
- 1984-10-30 EP EP84402177A patent/EP0141738B1/en not_active Expired
- 1984-10-31 ES ES1984282372U patent/ES282372Y/en not_active Expired
- 1984-10-31 YU YU01851/84A patent/YU185184A/en unknown
- 1984-10-31 KR KR1019840006794A patent/KR910000921B1/en not_active IP Right Cessation
- 1984-11-01 CA CA000466805A patent/CA1239844A/en not_active Expired
- 1984-11-01 ZA ZA848529A patent/ZA848529B/en unknown
- 1984-11-02 JP JP59232226A patent/JPS60138304A/en active Pending
-
1987
- 1987-04-13 US US07/037,903 patent/USRE32832E/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ZA848529B (en) | 1985-06-26 |
| FR2554208B1 (en) | 1986-01-17 |
| EP0141738A1 (en) | 1985-05-15 |
| USRE32832E (en) | 1989-01-17 |
| FR2554208A1 (en) | 1985-05-03 |
| ES282372Y (en) | 1985-12-16 |
| JPS60138304A (en) | 1985-07-23 |
| KR850003814A (en) | 1985-06-26 |
| ES282372U (en) | 1985-05-01 |
| KR910000921B1 (en) | 1991-02-18 |
| YU185184A (en) | 1988-08-31 |
| DE3462826D1 (en) | 1987-05-07 |
| EP0141738B1 (en) | 1987-03-25 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |