US3837694A - Hydraulic head closure mechanism - Google Patents

Hydraulic head closure mechanism Download PDF

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Publication number
US3837694A
US3837694A US5319870A US3837694A US 3837694 A US3837694 A US 3837694A US 5319870 A US5319870 A US 5319870A US 3837694 A US3837694 A US 3837694A
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US
United States
Prior art keywords
bolt
tensioning device
flange
head
piston
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 - Lifetime
Application number
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English (en)
Inventor
H Andrews
E Frisch
D Frisch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US5319870 priority Critical patent/US3837694A/en
Priority to GB1752471A priority patent/GB1299567A/en
Priority to CA114,151A priority patent/CA949467A/en
Priority to DE19712130590 priority patent/DE2130590A1/de
Priority to CH936271A priority patent/CH543693A/de
Priority to AT561471A priority patent/AT315972B/de
Priority to SE875271A priority patent/SE361077B/xx
Priority to FR7124813A priority patent/FR2100337A5/fr
Priority to NL7109382A priority patent/NL7109382A/xx
Priority to BE769665A priority patent/BE769665A/fr
Application granted granted Critical
Publication of US3837694A publication Critical patent/US3837694A/en
Priority to JP5884677U priority patent/JPS5315916Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B29/00—Accessories
    • B25B29/02—Bolt tensioners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
    • B23P19/06—Screw or nut setting or loosening machines
    • B23P19/067—Bolt tensioners
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C13/00—Pressure vessels; Containment vessels; Containment in general
    • G21C13/02—Details
    • G21C13/06—Sealing-plugs
    • 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
    • Y02E30/30—Nuclear fission reactors
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/916—Bolt having tension feature
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/20—Clamps
    • Y10T292/221—Screw and nut
    • Y10T292/223—Swingable

Definitions

  • ABSTRACT In order to reduce the time required for removal and replacement of a reactor vessel closure head, previously used studs for securing the closure head are replaced with a reduced member of larger diameter bolts located in radial slots in vessel and head flanges. All bolts are provided with individual hydraulic tensioning and tilting devices mounted on the head flange. The devices are operated simultaneously to preload the bolts and to actuate the bolts and the devices to an inclined position to permit the head to be removed when the tension load on the bolts is released.
  • This invention relates generally, to pressure vessels and, more particularly, to mechanism for securing and releasing the closure heads for nuclear reactor vessels.
  • the closure heads of large pressurized power reactors have been secured to the pressure vessel by a large number of studs which are threaded into the vessel flange and extend through holes in the head flange.
  • the necessary loading on this flange is obtained by nuts on the upper threaded portion of the studs which are tightened .by hand while the studs are preloaded by hydraulic tensioning devices.
  • Three tensioners are usually provided for each plant. They are applied to the studs in a certain prearranged rotation until all studs carry approximately the same load. To achieve this, each stud must be tensioned at least twice.
  • the studs To remove the closure head, the studs must be tensioned until the nuts become unloaded and can be backed off. Following this, all nuts and studs must be removed and stored before the closure head can be lifted off and refueling can commence.
  • the large number of holding studs for securing a closure head on a reactor vessel is replaced with a smaller number of larger diameter bolts, located in radial slots in the flanges of the vessel and the closure head, and all bolts are provided with individual hydraulic tensioning devices which are permanently located on the head flange.
  • the heads of the bolts engage the bottom surface of the vessel flange and each bolt extends continuously through its tensioning device.
  • a tilting device is provided for each bolt which actuates the bolt and its tensioning device to an inclined position during this operation.
  • FIGS. 1A and 1B when joined end-to-end, constitute a sectional view through a portion of a reactor vessel and closure head and one of the holding bolts and its tensioning and tilting devices;
  • FIG. 2 is a view, in section, taken along the line IIII of FIG. 18;
  • FIG. 3 is a view, in plan, of the tensioning and the tilting devices.
  • FIG. 4 is an enlarged detail view of a coupling utilized in the hydraulic system for the devices.
  • the structure shown therein comprises a portion of a generally cylindrical reactor vessel 10 having an integral outwardly extending flange 11, and ,agenerally hemispherical closure head 12 having an integral outwardly extending flange 13 which mates with the flange 11 on the vessel 10.
  • the vessel 10 may be of a type, well known in the art, suitable for use .in a nuclear power system.
  • a plurality of vertically aligned radial slots 15 is provided in the peripheries of the flanges l1 and 13.
  • holding bolts 16 are disposed in the radial slots 15.
  • Each bolt 16 has a head 17 engaging the bottom surface 18 of the vessel flange 11.
  • each bolt 16 extends continuously upwardly through a hydraulic pressure tensioning device 21 which surrounds the upper portion of the bolt 16 and is mounted on the upper or top surface 22 of the closure head flange 13.
  • Each bolt 16 has a threaded portion 23 at its upper end which extends above the top of the tensioning device 21.
  • Each tensioning device 21 is positioned on the flange 13 by means of one or more positioning pins 24 with tapered upper ends which enter holes 25 in a base plate 26 of the device 21, and by an inclined front surface of a bracket 27 which supports a tilting device 28.
  • the bracket 27 may be attached to the top surface of the flange 13 by means of bolts 29.
  • the number of holding bolts 16 has been reduced to 28 which is one-half the number of bolts previously utilized with a reactor vessel of the same size.
  • the diameter of the present bolts is 10 inches, whereas the diameter of the prior bolts is 7 inches.
  • Each bolt 16 is approximately 140 inches long and the preloading will be approximately 2,500,000 lbs. per bolt for a pressure vessel having an inside diameter of 173 inches.
  • the tensioning device 21 is provided with two pistons 31 and 32 in tandem.
  • the pistons 31 and 32 are reciprocably disposed inside cylinders 33 and 34, respectively, supported between the base plate 26 and a top plate 36 of a generally rectangular shape (see FIG. 3) whice are held together by four tie rods 37.
  • the lower cylinder 34 has a base portion 38 which rests on the base plate 26, and the upper cylinder 33 has a base portion 39 which rests on the top of the cylinder 34.
  • a collar 41 is disposed between the top of the upper cylinder 33 and the top plate 36.
  • the hydraulic fluid is introduced under the piston 31 through relatively small diameter tubing 42 which enters the wall of the cylinder 33 through a bolted flanged coupling 43 having a metal O-ring seal 44 as shown in detail in FIG. 4.
  • the hydraulic flows from the cylinder 33 into the cylinder 34 through a metal tube 45 and couplings 43.
  • Similar couplings 43 are also provided in the hydraulic lines near the top of the tensioning devices to permit ease of disassembly when it becomes necessary to remove the device for inspection or repair.
  • the lines from these couplings to hydraulic manifolds 46 which conveniently may be mounted on an existing structure (not shown) above the tensioning devices, must be flexible to permit tilting of the tensioning devices and the holding bolts, as will be described more fully hereinafter. The flexibility may be achieved by forming this part of the tubing into a loose helical spring 47.
  • Hydraulic pressure may also be applied above the upper piston 31 to drive both pistons downwardly against any residual pressure under the pistons resulting from a possible stand pipe effect of the pressurizing equipment. In this manner the bolt 16 is permitted to drop downwardly by gravity under certain conditions described hereinafter.
  • the tilting device 28 is of the fluid pressure actuated type. It comprises a reciprocating piston 51 disposed inside a cylinder 52 held between a base plate 53 and a top plate 54 by tie rods 55. Hydraulic or other pressure fluid is introduced above the piston 51 through a passageway 56 in the top plate 54 and a coupling 43 of the type previously described.
  • the piston 51 is connected to a bifurcated member 57 by means of a connecting rod 58 which is threaded into the piston 51 and the member 57.
  • the member 57 has arms 59 which straddle a lever 61 secured to or formed integrally with the top plate 36 of the tensioning device 21. A cross pin 62 in the arms 59 engages the lever 61 when the piston 51 is moved downwardly.
  • the pistons in the tensioning device 21 are shown in a position where hydraulic pressure is being applied under the pistons for tensioning the bolt 16.
  • the developed upward thrust is transmitted through a set of spherical washers 63 to thrust means 64 fixed on the bolt 16.
  • the thrust means 64 may be a nut threaded on the bolt 16 and fixed in positions by means of a screw 65.
  • Other suitable thrust transmitting means affixed to the bolt 16 may be utilized if desired.
  • adjustable means preferably a nut 66 which is free to turn on the threads 23 on the bolt 16 above the tensioning device 21, is lowered by means of handwheel 67 until the nut 66 is in firm contact with the top support plate 36 through another set of spherical washers 68.
  • the handwheel 67 may be attached to the adjustable nut 66 by means of bolts 69.
  • the bolt tension load will be transferred from the thrust means 64 to the adjustable nut 66, and the tension load is transmitted through the cylinders and other stationary parts of the tensioning device, which are under compression, to the closure head flange 13. In this manner the tension load is transferred from the fixed nut 64, which is inside the tensioning device and not readily accessible, to the adjustable nut 66 which is outside the tensioning device and readily accessible for manual operation.
  • the actual value of the bolt loading can be estimated by a micrometer 70 on top of the bolt 16 which indirectly measures the elongation or strain of the stressed bolt by comparing its length with that of an unstressed rod 71 of the same material, located in a hole through the center of the bolt and attached to the bolt head 17.
  • the downward force on the lever 61 causes the device 21 to pivot about a pivot line 75 located at the inner corner of the base plate 26 where it abuts the bracket 27 which supports the tilting device 28.
  • the tapered end of the pin 24 and the inclined surface of the bracket 27 permit the tensioning device 21 to tilt about the pivot line 75.
  • An extension on the bottom of the tilting device piston 51 stops piston movement downwardly when the desired tilting position has been reached. Rotation of the bifurcated member 57 is prevented by an upwardly extending projection 76 on the top plate 54 of the tilting device 28.
  • the closure head 12 With all holding bolts 16 tilted or inclined, the closure head 12 may be lifted vertically without interference of the bolts with the pressure vessel flange 11. Any time after the bolt heads clear the flange, pressure on the tilting devices may be removed causing the bolts to return to the vertical position. A heavy spring 77 in the cylinder 52 of the tilting device returns the piston 51 to its original position after the pressure is removed.
  • the base plate 53 of the tilting device is mounted on a swivel pin 78 supported on a lower support base 79 attached to the bracket 27 by bolts 81.
  • a spring 82 is provided between the lower support base 79 and the actuator base plate 53 to return the tilting device 28 to the vertical position when the pressure is removed from the piston 51, thereby deenergizing the tilting device.
  • Each tensioning device 21 may be removed individually for inspection or repair by first disconnecting the hydraulic supply lines and then forcing the tilting device 28 out of the way.
  • the tensioning device 21 may be lifted vertically until clearing the positioning pins 25 and then radially until the bolt heads clear the vessel flange.
  • the invention provides a head closure mechanism which enables the time required for head removal and replacement during refueling of a nuclear reactor to be greatly reduced.
  • the tensioning devices and the tilting devices of the mechanism may be readily mounted on the top flange of the closure head of the reactor vessel.
  • the bolt tension load is transmitted to the closure head flange through members of the tensioning devices which are under compression. This increases the effective length of the holding bolts, thereby preventing any appreciable change in bolt loading resulting from differential thermal expansion.
  • a head closure mechanism for a nuclear reactor comprising: a generally cylindrical reactor vessel and a closure head each having an outwardly extending flange with a plurality of vertically aligned radial slots in the periphery of the flanges, bolts disposed in said slots to retain the closure head on the vessel, each bolt having a head engaging the bottom surface of the vessel flange, a hydraulic pressure bolt tensioning device surrounding each bolt and mounted on the top surface of the closure head flange, said bolt extending continuously through the device with a threaded portion at its upper end, thrust means fixed on the bolt axially outward from the tensioning device, said tensioning device being located between the thrust means and the head flange, said tensioning device applying force in one axial direction against the head flange and in the other axial direction against the thrust means on the bolt for elongating the bolt between the bottom of the vessel flange and said thrust means on the bolt, and adjustable means threaded on the threaded portion axially outward from the tensioning device and the thrust
  • the tensioning device includes at least one cylinder containing a reciprocable piston for applying a tension load on the bolt through said fixed thrust means, and the adjustable means is operable movable to a position in which the tension load on the bolt is transmitted to the closure head flange through the adjustable means and the cylinder when the hydraulic pressure is removed from the piston.
  • the tensioning device includes a base plate mounted on the top surface of the closure head flange, a top plate spaced from the base plate, at least one cylinder disposed between the plates, a reciprocable piston within the cylinder for applying a tension load on the bolt through said thrust means when hydraulic pressure is applied to the piston, and said adjustable means being operable to a position with respect to the top plate to transfer the tension load on the bolt from the thrust means to the adjustable means and transmit the bolt tension load through the top plate and the cylinder and the base plate to the closure head flange when the hydraulic pressure is removed from the piston.
  • the thrust means includes a nut affixed on the bolt substantially at the top of the tensioning device, and the adjustable means includes a nut having a handwheel attached thereto for manually rotating the nut.
  • tensioning device is operable to permit disengagement of the bolt head from the vessel flange, and including a tilting device mounted on the closure head flange for actuating the bolt and its tensioning device to an inclined position to permit the closure head to be lifted vertically without the bolt interferring with the vessel flange.
  • the tilting device comprises a fluid pressure actuated piston, a bifurcated member having arms straddling said lever, and a cross pin in the arms engaging the lever when the piston is actuated downwardly.
  • a head closure mechanism for a vessel member and a closure head member each having an outwardly extending flange with a plurality of vertically aligned openings therein comprising bolts disposed in said openings to retain the closure head member on the vessel member, a hydraulic pressure tensioning device surrounding each bolt and mounted on a surface of the flange on one of said members, said bolt extending continuously through the device with a threaded portion at one end, thrust means fixed on the bolt, said tensioning device applying force between the thrust means and tension load on the bolt from the fixed thrust means to the adjustable means when the hydraulic pressure is removed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
US5319870 1970-07-08 1970-07-08 Hydraulic head closure mechanism Expired - Lifetime US3837694A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US5319870 US3837694A (en) 1970-07-08 1970-07-08 Hydraulic head closure mechanism
GB1752471A GB1299567A (en) 1970-07-08 1971-05-27 Pressure-fluid actuated head closure mechanism
CA114,151A CA949467A (en) 1970-07-08 1971-05-28 Hydraulic head closure mechanism
DE19712130590 DE2130590A1 (de) 1970-07-08 1971-06-21 Gefaessdeckel-Verschlussmechanismus
CH936271A CH543693A (de) 1970-07-08 1971-06-25 Gefässdeckel-Verschlussmechanismus
AT561471A AT315972B (de) 1970-07-08 1971-06-29 Verschlußvorrichtung zum Befestigen von Deckeln an Gefäßen
SE875271A SE361077B (fr) 1970-07-08 1971-07-06
FR7124813A FR2100337A5 (fr) 1970-07-08 1971-07-07
NL7109382A NL7109382A (fr) 1970-07-08 1971-07-07
BE769665A BE769665A (fr) 1970-07-08 1971-07-08 Mecanisme hydraulique de fermeture de couvercle
JP5884677U JPS5315916Y2 (fr) 1970-07-08 1977-05-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5319870 US3837694A (en) 1970-07-08 1970-07-08 Hydraulic head closure mechanism

Publications (1)

Publication Number Publication Date
US3837694A true US3837694A (en) 1974-09-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
US5319870 Expired - Lifetime US3837694A (en) 1970-07-08 1970-07-08 Hydraulic head closure mechanism

Country Status (11)

Country Link
US (1) US3837694A (fr)
JP (1) JPS5315916Y2 (fr)
AT (1) AT315972B (fr)
BE (1) BE769665A (fr)
CA (1) CA949467A (fr)
CH (1) CH543693A (fr)
DE (1) DE2130590A1 (fr)
FR (1) FR2100337A5 (fr)
GB (1) GB1299567A (fr)
NL (1) NL7109382A (fr)
SE (1) SE361077B (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963565A (en) * 1973-02-13 1976-06-15 Siempelkamp Giesserei Kg Holddown arrangement for removable cover of a pressurized nuclear-reactor core and method of using same
US4071402A (en) * 1975-01-10 1978-01-31 Westinghouse Electric Corporation Nuclear reactor apparatus
US4075923A (en) * 1976-06-17 1978-02-28 Latham Raymond E Fastener tensioning apparatus
US4185504A (en) * 1977-11-03 1980-01-29 Kraftwerk Union Aktiengesellschaft Apparatus for measuring the pre-tension of a threaded bolt
US4185505A (en) * 1977-11-03 1980-01-29 Kraftwerk Union Aktiengesellschaft Apparatus for measuring the pre-tension of a threaded bolt
US4185506A (en) * 1977-11-03 1980-01-29 Kraftwerk Union Aktiengesellschaft Apparatus for measuring the pre-tension of a threaded bolt
US4452753A (en) * 1982-02-26 1984-06-05 Combustion Engineering, Inc. Apparatus for cleaning and inspecting closure studs of a nuclear reactor vessel
US4454790A (en) * 1982-04-30 1984-06-19 Westinghouse Electric Corp. Bolt stretch measurement device
US5046906A (en) * 1987-09-29 1991-09-10 Bucknell John W Force applicators
GB2291155A (en) * 1994-07-15 1996-01-17 Hydra Tight Ltd Hydraulic bolt or stud tensioning apparatus
US5589640A (en) * 1996-04-03 1996-12-31 Butler; Patrick J. Method for detecting changes in preload on a tie rod installed as part of a core shroud repair in a boiling water reactor
US20040115024A1 (en) * 2002-12-16 2004-06-17 Siemens Westinghouse Power Corporation Tensioning apparatus and method
US20040115023A1 (en) * 2002-12-16 2004-06-17 Siemens Westinghouse Power Corporation Tensioning apparatus and method
DE102004043145B3 (de) * 2004-09-03 2006-05-18 Hohmann, Jörg Hydraulische Schraubenspannvorrichtung
US20090272021A1 (en) * 2005-05-17 2009-11-05 Gary Bennis Slip bobber rig
US20100005663A1 (en) * 2006-09-01 2010-01-14 Jean-Michel Monville Process and device for setting up and controlling a hydraulic chucking of one or a plurality of bolts
US20140245868A1 (en) * 2008-11-14 2014-09-04 Wagner Vermögensverwaltungs-GmbH & Co. KG Screw tensioning device
US11311973B2 (en) * 2018-03-29 2022-04-26 Jörg Hohmann Device for tightening screw connections

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2329414A1 (fr) * 1975-10-27 1977-05-27 Skf Cie Applic Mecanique Tendeur hydraulique a plusieurs etages pour boulons ou goujons precontraints
DE2952025C2 (de) * 1979-12-22 1985-02-28 Brown Boveri Reaktor GmbH, 6800 Mannheim Stutzendurchführung
FR2540574A1 (fr) * 1983-02-04 1984-08-10 Electricite De France Procede et dispositif pour le montage d'un ensemble de raccordement visse etanche, notamment pour raccorder un element plongeur a une enceinte

Citations (7)

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Publication number Priority date Publication date Assignee Title
US2734824A (en) * 1954-10-18 1956-02-14 Pressure vessels
US2844021A (en) * 1955-04-29 1958-07-22 Crane Co Valve locking device
SU135079A1 (ru) * 1960-03-16 1960-11-30 Ф.Я. Михалев Автоклав
US3027993A (en) * 1960-09-28 1962-04-03 United States Borax Chem Tensioning means for belt conveyors
US3130628A (en) * 1958-10-06 1964-04-28 Moeller & Neumann Gmbh Arrangement for elongating a stay bolt means or tension anchor independently of nut means associated therewith
US3154006A (en) * 1962-10-12 1964-10-27 Danly Mach Specialties Inc Tensioning system for power press tie rods
US3270906A (en) * 1963-09-25 1966-09-06 Chemical Construction Corp Closure for pressure vessels

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734824A (en) * 1954-10-18 1956-02-14 Pressure vessels
US2844021A (en) * 1955-04-29 1958-07-22 Crane Co Valve locking device
US3130628A (en) * 1958-10-06 1964-04-28 Moeller & Neumann Gmbh Arrangement for elongating a stay bolt means or tension anchor independently of nut means associated therewith
SU135079A1 (ru) * 1960-03-16 1960-11-30 Ф.Я. Михалев Автоклав
US3027993A (en) * 1960-09-28 1962-04-03 United States Borax Chem Tensioning means for belt conveyors
US3154006A (en) * 1962-10-12 1964-10-27 Danly Mach Specialties Inc Tensioning system for power press tie rods
US3270906A (en) * 1963-09-25 1966-09-06 Chemical Construction Corp Closure for pressure vessels

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963565A (en) * 1973-02-13 1976-06-15 Siempelkamp Giesserei Kg Holddown arrangement for removable cover of a pressurized nuclear-reactor core and method of using same
US4071402A (en) * 1975-01-10 1978-01-31 Westinghouse Electric Corporation Nuclear reactor apparatus
US4075923A (en) * 1976-06-17 1978-02-28 Latham Raymond E Fastener tensioning apparatus
US4185504A (en) * 1977-11-03 1980-01-29 Kraftwerk Union Aktiengesellschaft Apparatus for measuring the pre-tension of a threaded bolt
US4185505A (en) * 1977-11-03 1980-01-29 Kraftwerk Union Aktiengesellschaft Apparatus for measuring the pre-tension of a threaded bolt
US4185506A (en) * 1977-11-03 1980-01-29 Kraftwerk Union Aktiengesellschaft Apparatus for measuring the pre-tension of a threaded bolt
US4452753A (en) * 1982-02-26 1984-06-05 Combustion Engineering, Inc. Apparatus for cleaning and inspecting closure studs of a nuclear reactor vessel
US4454790A (en) * 1982-04-30 1984-06-19 Westinghouse Electric Corp. Bolt stretch measurement device
US5046906A (en) * 1987-09-29 1991-09-10 Bucknell John W Force applicators
GB2291155B (en) * 1994-07-15 1998-04-08 Hydra Tight Ltd Hydraulic bolt tensioning arrangement
GB2291155A (en) * 1994-07-15 1996-01-17 Hydra Tight Ltd Hydraulic bolt or stud tensioning apparatus
US5809100A (en) * 1996-04-03 1998-09-15 Mpr Associates, Inc. Apparatus for detecting changes in preload on a tie rod installed as part of a core shroud repair in a boiling water reactor
US5589640A (en) * 1996-04-03 1996-12-31 Butler; Patrick J. Method for detecting changes in preload on a tie rod installed as part of a core shroud repair in a boiling water reactor
US7066699B2 (en) 2002-12-16 2006-06-27 Siemens Westinghouse Power Corporation Tensioning apparatus and method
US20040115024A1 (en) * 2002-12-16 2004-06-17 Siemens Westinghouse Power Corporation Tensioning apparatus and method
US20040115023A1 (en) * 2002-12-16 2004-06-17 Siemens Westinghouse Power Corporation Tensioning apparatus and method
US6840726B2 (en) * 2002-12-16 2005-01-11 Siemens Westinghouse Power Corporation Tensioning apparatus and method
US20080034925A1 (en) * 2004-09-03 2008-02-14 Jorg Hohmann Hydraulic Screw Tightening or Tensioning Device
DE102004043145B3 (de) * 2004-09-03 2006-05-18 Hohmann, Jörg Hydraulische Schraubenspannvorrichtung
US7661336B2 (en) 2004-09-03 2010-02-16 Jorg Hohmann Hydraulic screw tightening or tensioning device
US20090272021A1 (en) * 2005-05-17 2009-11-05 Gary Bennis Slip bobber rig
US20100005663A1 (en) * 2006-09-01 2010-01-14 Jean-Michel Monville Process and device for setting up and controlling a hydraulic chucking of one or a plurality of bolts
US8261421B2 (en) * 2006-09-01 2012-09-11 Aktiebolaget Skf Method for setting up and controlling a hydraulic tensioner for applying a preload on one or a plurality of bolts
US20140245868A1 (en) * 2008-11-14 2014-09-04 Wagner Vermögensverwaltungs-GmbH & Co. KG Screw tensioning device
US9248532B2 (en) * 2008-11-14 2016-02-02 Wagner Vermoegensverwaltungs-Gmbh & Co. Kg Screw tensioning device
US11311973B2 (en) * 2018-03-29 2022-04-26 Jörg Hohmann Device for tightening screw connections

Also Published As

Publication number Publication date
JPS5315916Y2 (fr) 1978-04-26
JPS52160096U (fr) 1977-12-05
CH543693A (de) 1973-10-31
SE361077B (fr) 1973-10-15
BE769665A (fr) 1972-01-10
DE2130590A1 (de) 1972-01-20
FR2100337A5 (fr) 1972-03-17
CA949467A (en) 1974-06-18
AT315972B (de) 1974-06-25
NL7109382A (fr) 1972-01-11
GB1299567A (en) 1972-12-13

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