US10385974B2 - Passive shutdown sealing device for a system of shaft seals of a reactor coolant pump set - Google Patents

Passive shutdown sealing device for a system of shaft seals of a reactor coolant pump set Download PDF

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Publication number
US10385974B2
US10385974B2 US14/376,101 US201314376101A US10385974B2 US 10385974 B2 US10385974 B2 US 10385974B2 US 201314376101 A US201314376101 A US 201314376101A US 10385974 B2 US10385974 B2 US 10385974B2
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United States
Prior art keywords
pump unit
coolant pump
reactor coolant
sealing device
sealing ring
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US14/376,101
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English (en)
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US20150108721A1 (en
Inventor
Romain Thuillier
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Areva NP SAS
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Areva NP SAS
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Assigned to AREVA NP reassignment AREVA NP ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: THUILLIER, Romain
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Classifications

    • 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
    • F16J15/00—Sealings
    • 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
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/188—Split assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/14—Shaft sealings operative only when pump is inoperative
    • F04D29/146—Shaft sealings operative only when pump is inoperative especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/08—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive
    • 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
    • F16J15/00—Sealings
    • F16J15/002—Sealings comprising at least two sealings in succession
    • F16J15/008—Sealings comprising at least two sealings in succession with provision to put out of action at least one sealing; One sealing sealing only on standstill; Emergency or servicing sealings
    • 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
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • 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
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/26—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings
    • F16J15/28—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings with sealing rings made of metal
    • 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
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
    • 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
    • F16J15/00—Sealings
    • F16J15/54—Other sealings for rotating shafts

Definitions

  • the field of the invention is that of reactor coolant pump units of pressurised water nuclear reactors (PWNR).
  • PWNR pressurised water nuclear reactors
  • the invention further relates to a passive shutdown sealing device (SSD) for controlling a primary coolant leakage resulting from a failing system of seals present on the reactor coolant pump unit.
  • SSD passive shutdown sealing device
  • shutdown sealing devices must, in that accidental situation and after shutdown of the coolant pump, allow a primary coolant leakage resulting from the failing system of seals of the reactor coolant pump unit to be controlled and stopped.
  • this type of device is activated by an auxiliary source (such as for example a pressurised nitrogen circuit) and triggering is driven by information delivered by the reactor control, in case of losses of the cooling sources of the reactor coolant pump unit.
  • an auxiliary source such as for example a pressurised nitrogen circuit
  • the invention aims at providing an improvement of such a sealing device for ensuring activation of the sealing device as well as its good working order during an accidental situation.
  • the invention provides a passive shutdown sealing device for a system of shaft seals of a reactor coolant pump unit including:
  • the design of the device according to the invention enables a simplified installation on architectures of the reactor coolant pump units already in service.
  • the device according to the invention it is also possible to adjust the device to the operating requirements of each type of nuclear reactor by adjusting the auto-activation temperature of the device, and more precisely by modifying the composition of the fusionable element.
  • One object of the invention is also to provide a reactor coolant pump unit including:
  • FIG. 1 illustrates a partial cross-section view of a system of seals of a reactor coolant pump unit
  • FIG. 2 illustrates a passive shutdown sealing device according to the invention in its rest position integrated in a system of seals of a reactor coolant pump unit;
  • FIG. 3 illustrates the shutdown device according to the invention, illustrated in FIG. 2 , in its activated position.
  • Coolant pumps of pressurised water reactors are of the vertically mounted centrifugal type. Dynamic sealing at the outlet of the shaft 10 ( FIG. 1 ) is ensured by a system of seals consisting of three stages.
  • Seal no 1 The first stage is called seal no 1.
  • Seal no 1, reference J 1 is a controlled leakage hydrostatic seal. In regular operation, a leakage flow, illustrated by arrow F 1 , occurs along the shaft 10 .
  • seal no 1 In an accidental situation, the fluid temperature at the inlet of seal no 1 undergoes a quick temperature rise to reach a value close to the temperature of the primary circuit, that is about 280° C. At this temperature, the performances of seal no 1 are degraded which causes a very high increase in the leakage flow which can exceed 10 m 3 per hour.
  • the passive shutdown sealing devices SSD are meant in this accidental situation to block the leakage path F 1 downstream of seal no 1.
  • FIG. 1 more particularly represents the leakage path F 1 along the shaft 10 between seal no 1 and seal no 2 (not represented) located upstream of seal no 1.
  • the SSD device 20 is positioned on the leakage path F 1 so as to be capable of blocking the flow of the leakage flow along the shaft 10 in an accidental situation.
  • FIG. 2 more particularly illustrates the sealing device 20 during regular operating conditions of the reactor coolant pump unit, that is when the temperature of the leakage flow is below a threshold value.
  • FIG. 3 more particularly illustrates the sealing device during accidental operating conditions of the reactor coolant pump unit, that is when the temperature of the leakage flow is above a threshold value.
  • the shutdown sealing device 20 includes:
  • the pistons 22 are distributed about the circumference of the sealing ring 23 .
  • the sealing ring 23 has a first chamfered side wall 33 the slope of which is designed to cooperate with the chamfered wall 32 at the lower part of the pistons 22 .
  • elastic means 24 for example compression coil springs, wave springs, spring washers
  • the pistons 22 include bores 34 designed to partly or totally accommodate the elastic means 24 .
  • the locking/unlocking means 25 are formed by a polymeric material fusionable ring selected depending on its degradation temperature and its loss of mechanical characteristics from a given temperature threshold.
  • the device includes three pistons 22 and three elastic means 24 distributed at 120° on the circumference of the pump shaft 10 of the reactor coolant pump unit.
  • the sealing ring 23 is kept set back from the leakage path F 1 .
  • the sealing ring 23 is locked into this position by spring return and by pressing against the chamfered wall 32 of the pistons 22 , the pistons 22 being kept in their rest position by the fusionable ring 25 .
  • the increase in the temperature of the leakage flow results in increasing the temperature in the vicinity of the shutdown device 20 , and in particular the temperature of the fusionable ring 25 .
  • a threshold value predefined depending on the nature of the fusionable ring 25 , the latter is degraded consequently not ensuring any longer a sufficient mechanical strength to resist to the strain generated by the plurality of elastic means 24 .
  • the fusion of the fusionable ring 25 upon increasing the temperature thus enables the device 20 to be triggered by unlocking the pistons 22 .
  • the axial movement of the pistons 22 generates a radial strain on the sealing ring 23 via the chamfered wall 32 of the pistons slidingly cooperating with the chamfered wall 33 of the sealing ring 23 .
  • the sealing ring 23 ensures blocking of the leakage path F 1 thanks to the strain exerted by the elastic means 24 and then also by the autoclaving effect induced by the increase in the pressure upstream of the sealing device 20 in the activated position.
  • the sealing ring 23 has, on its second side wall 34 , a shoulder designed to integrate a split collar 26 , called an anti-extrusion collar.
  • the split collar 26 is designed to optimally ensure sealing of the shutdown device in particular when during an exceptional situation, the temperature is such that the mechanical characteristics of the sealing ring 23 would be degraded.
  • the choice of the polymer of the fusionable ring 25 is made such that it can resist to the strain exerted by the elastic means 24 up to a temperature threshold between 80° C. and 200° C. and advantageously equal to 150° C.
  • the sealing ring 23 of the shutdown device 20 can be made of a polymeric material resisting to high temperatures (i.e. above 300° C.) such as for example PEEK or a glass or carbon fibre filled PEEK composite.
  • a polymeric material resisting to high temperatures such as for example PEEK or a glass or carbon fibre filled PEEK composite.
  • the split sealing ring 23 of the device 20 can also be made of a metal material.
  • a residual leakage flow will be expected because of existing clearances between the sealing ring 23 and parts in contact therewith.
  • the use of a metal material enables holding the device, in particular the sealing ring to be secured in case of activation of said device before full shutdown of rotation of the pump shaft.
  • the split sealing ring 23 can also be made of a composite material formed by a metal core coated with a material more malleable than the core, such for example a polymer, nickel or even silver.
  • a material more malleable than the core such for example a polymer, nickel or even silver.
  • the peripheral material more malleable than the core will allow existing clearances between the different parts to be filled by deforming the surface layer. In case of wear of the surface layer caused by the shaft rotation, the denser metal core allows a limitation in the leakage flow to be ensured.
  • the pistons 22 as well as the anti-extrusion split collar 26 are advantageously made of stainless steel type metal materials.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US14/376,101 2012-02-01 2013-01-31 Passive shutdown sealing device for a system of shaft seals of a reactor coolant pump set Active US10385974B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1250957A FR2986300B1 (fr) 2012-02-01 2012-02-01 Dispositif d'etancheite a l'arret passif pour systeme de joints d'arbre d'un groupe motopompe primaire
FR1250957 2012-02-01
PCT/EP2013/051928 WO2013113827A1 (fr) 2012-02-01 2013-01-31 Dispositif d'etancheite a l'arret passif pour systeme de joints d'arbre d'un groupe motopompe primaire

Publications (2)

Publication Number Publication Date
US20150108721A1 US20150108721A1 (en) 2015-04-23
US10385974B2 true US10385974B2 (en) 2019-08-20

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Family Applications (1)

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US14/376,101 Active US10385974B2 (en) 2012-02-01 2013-01-31 Passive shutdown sealing device for a system of shaft seals of a reactor coolant pump set

Country Status (15)

Country Link
US (1) US10385974B2 (enrdf_load_stackoverflow)
EP (1) EP2809971B1 (enrdf_load_stackoverflow)
JP (1) JP6240094B2 (enrdf_load_stackoverflow)
KR (1) KR101790837B1 (enrdf_load_stackoverflow)
CN (1) CN104169618B (enrdf_load_stackoverflow)
BR (1) BR112014018800B1 (enrdf_load_stackoverflow)
CA (1) CA2863412C (enrdf_load_stackoverflow)
ES (1) ES2584385T3 (enrdf_load_stackoverflow)
FR (1) FR2986300B1 (enrdf_load_stackoverflow)
IN (1) IN2014DN06483A (enrdf_load_stackoverflow)
PL (1) PL2809971T3 (enrdf_load_stackoverflow)
RU (1) RU2608449C2 (enrdf_load_stackoverflow)
SI (1) SI2809971T1 (enrdf_load_stackoverflow)
WO (1) WO2013113827A1 (enrdf_load_stackoverflow)
ZA (1) ZA201405674B (enrdf_load_stackoverflow)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2992392B1 (fr) * 2012-06-25 2014-07-11 Jspm Dispositif d’etancheite a l’arret passif pour systeme de joints d’arbre d’un groupe motopompe primaire
US9206791B2 (en) * 2013-03-13 2015-12-08 Westinghouse Electric Company Llc Pump seal with thermal retracting actuator
US9217441B2 (en) * 2013-08-20 2015-12-22 Westinghouse Electric Company Llc Pump seal with thermal retracting actuator
US9206812B2 (en) * 2013-03-13 2015-12-08 Westinghouse Electric Company Llc Pump seal with thermal retracting actuator
CN103671228A (zh) * 2013-12-10 2014-03-26 中广核工程有限公司 对反应堆冷却剂泵进行应急轴封的方法及轴封组件
KR101548866B1 (ko) * 2014-05-14 2015-09-01 한국수력원자력 주식회사 원자로 냉각재 펌프의 피동형 질소주입장치
CN105240309B (zh) * 2014-11-19 2017-11-17 中广核工程有限公司 核反应堆冷却剂泵及其非能动停车密封组件
CN104976150B (zh) * 2015-07-16 2017-11-17 中广核工程有限公司 核反应堆冷却剂泵及其非能动停车密封装置
DE102016003180A1 (de) * 2016-03-16 2017-09-21 Ksb Aktiengesellschaft Kreiselpumpe mit einer Anordnung zur Reduzierung einer Rückströmung
GB2578030B (en) * 2017-05-16 2021-12-15 China Nuclear Power Eng Company Ltd Nuclear reactor coolant pump and passive parking sealing device thereof
JP6764381B2 (ja) * 2017-08-24 2020-09-30 三菱重工業株式会社 軸シール構造および一次冷却材循環ポンプ
JP2019173889A (ja) * 2018-03-29 2019-10-10 三菱重工業株式会社 多段軸シール装置及び回転機械
KR102039266B1 (ko) * 2018-07-26 2019-10-31 한국수력원자력 주식회사 원자로 냉각재 순환펌프(rcp)의 피동형 밀봉 누설 차단 장치
US11448229B2 (en) 2019-03-29 2022-09-20 Jody MADOCHE Seal assembly
DE102019115147C5 (de) * 2019-06-05 2024-09-05 Schott Ag Biokompatibles Verbundelement und Verfahren zur Herstellung eines biokompatiblen Verbundelements
US11320069B2 (en) 2019-07-22 2022-05-03 Parker-Hannifin Corporation Threaded coupling with under-torque prevention
CN111237484B (zh) * 2020-03-19 2025-07-25 吴忠仪表有限责任公司 一种超低温低泄漏高压平衡式调节阀
EP4441405A1 (en) * 2021-12-03 2024-10-09 Proserv Gilmore Valve LLC Pressure relief valve for high-pressure fluids, including abrasives laden fluids

Citations (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2756017A (en) * 1952-02-25 1956-07-24 Silverman Daniel Fluid control devices
US3250539A (en) * 1963-03-25 1966-05-10 Crane Packing Co Seal with spring holder
USRE27188E (en) * 1970-06-25 1971-10-12 Robert gottschalk
US3926443A (en) * 1974-03-05 1975-12-16 Coors Porcelain Co Composite seal ring and assembly
US4175755A (en) * 1978-12-11 1979-11-27 Carrier Corporation Mechanical seal assembly
US4475736A (en) * 1983-02-10 1984-10-09 Allis-Chalmers Corporation Bushing seal valve
US4641842A (en) * 1985-03-29 1987-02-10 Ebara Research Ltd. Shaft sealing device with floating seal member
US4660838A (en) * 1986-02-27 1987-04-28 Mitsubishi Jukogyo Kabushiki Kaisha Vibration suppressing sealing device for a rotary machine
US5014999A (en) * 1989-03-06 1991-05-14 Car-Graph, Inc. Pressure enhanced self aligning seal
US5292138A (en) * 1992-09-21 1994-03-08 General Elecric Company Rotor to rotor split ring seal
US5409240A (en) * 1992-11-12 1995-04-25 Unilab Bearing Protection Company, Inc. Seal with self-lubricating contact surface
US5562294A (en) * 1994-01-28 1996-10-08 Bw/Ip International, Inc. Backup seal for axial face seal
US5571268A (en) * 1993-12-16 1996-11-05 A.W. Chesterton Company Universal split mechanical seal
US6412784B1 (en) * 2000-05-26 2002-07-02 The United States Of America As Represented By The Secretary Of The Navy Split face mechanical seal system
US20030011135A1 (en) * 2001-07-12 2003-01-16 Honeywell International, Inc. Face seal with internal drain
US20030057655A1 (en) * 2001-09-24 2003-03-27 Siemens Westinghouse Power Corporation Environmentally-reactive seal and associated method
GB2417298A (en) 2004-08-21 2006-02-22 Alstom Technology Ltd A spring-urged face seal
US20070140877A1 (en) 2005-10-11 2007-06-21 Sanville Mark E Shutdown seal for reactor coolant pump
US20070172367A1 (en) * 2006-01-26 2007-07-26 Janocko David J Flow restricting devices in pumps
US8690534B1 (en) * 2009-06-08 2014-04-08 Curtiss-Wright Electro-Mechanical Corporation Backup seals in rotary pumps
US8939710B2 (en) * 2011-08-24 2015-01-27 United Technologies Corporation Rotating turbomachine seal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD125725A1 (enrdf_load_stackoverflow) * 1976-09-10 1977-05-11
DE3804183C2 (de) * 1988-02-11 1994-11-24 Klein Schanzlin & Becker Ag Wellendichtung für Kreiselpumpen
US5171024A (en) * 1988-05-23 1992-12-15 Westinghouse Electric Corp. Reactor coolant pump shaft seal utilizing shape memory metal
US8356972B2 (en) * 2008-12-10 2013-01-22 Westinghouse Electric Company Llc Thermally activated shutdown seals for rotatable shafts

Patent Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2756017A (en) * 1952-02-25 1956-07-24 Silverman Daniel Fluid control devices
US3250539A (en) * 1963-03-25 1966-05-10 Crane Packing Co Seal with spring holder
USRE27188E (en) * 1970-06-25 1971-10-12 Robert gottschalk
US3926443A (en) * 1974-03-05 1975-12-16 Coors Porcelain Co Composite seal ring and assembly
US4175755A (en) * 1978-12-11 1979-11-27 Carrier Corporation Mechanical seal assembly
US4475736A (en) * 1983-02-10 1984-10-09 Allis-Chalmers Corporation Bushing seal valve
US4641842A (en) * 1985-03-29 1987-02-10 Ebara Research Ltd. Shaft sealing device with floating seal member
US4660838A (en) * 1986-02-27 1987-04-28 Mitsubishi Jukogyo Kabushiki Kaisha Vibration suppressing sealing device for a rotary machine
US5014999A (en) * 1989-03-06 1991-05-14 Car-Graph, Inc. Pressure enhanced self aligning seal
US5292138A (en) * 1992-09-21 1994-03-08 General Elecric Company Rotor to rotor split ring seal
US5409240A (en) * 1992-11-12 1995-04-25 Unilab Bearing Protection Company, Inc. Seal with self-lubricating contact surface
US5571268A (en) * 1993-12-16 1996-11-05 A.W. Chesterton Company Universal split mechanical seal
US5562294A (en) * 1994-01-28 1996-10-08 Bw/Ip International, Inc. Backup seal for axial face seal
US6412784B1 (en) * 2000-05-26 2002-07-02 The United States Of America As Represented By The Secretary Of The Navy Split face mechanical seal system
US20030011135A1 (en) * 2001-07-12 2003-01-16 Honeywell International, Inc. Face seal with internal drain
US20030057655A1 (en) * 2001-09-24 2003-03-27 Siemens Westinghouse Power Corporation Environmentally-reactive seal and associated method
GB2417298A (en) 2004-08-21 2006-02-22 Alstom Technology Ltd A spring-urged face seal
US20070009350A1 (en) * 2004-08-21 2007-01-11 Tothill Mark H Sealing arrangement
US20070140877A1 (en) 2005-10-11 2007-06-21 Sanville Mark E Shutdown seal for reactor coolant pump
US20070172367A1 (en) * 2006-01-26 2007-07-26 Janocko David J Flow restricting devices in pumps
US8690534B1 (en) * 2009-06-08 2014-04-08 Curtiss-Wright Electro-Mechanical Corporation Backup seals in rotary pumps
US8939710B2 (en) * 2011-08-24 2015-01-27 United Technologies Corporation Rotating turbomachine seal

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Publication number Publication date
KR20140117540A (ko) 2014-10-07
BR112014018800A2 (enrdf_load_stackoverflow) 2017-06-20
CN104169618A (zh) 2014-11-26
CA2863412C (fr) 2019-11-26
BR112014018800B1 (pt) 2020-12-15
JP6240094B2 (ja) 2017-11-29
EP2809971B1 (fr) 2016-04-06
FR2986300A1 (fr) 2013-08-02
ES2584385T3 (es) 2016-09-27
BR112014018800A8 (pt) 2017-07-11
US20150108721A1 (en) 2015-04-23
ZA201405674B (en) 2017-06-28
FR2986300B1 (fr) 2014-03-07
KR101790837B1 (ko) 2017-10-26
PL2809971T3 (pl) 2016-11-30
RU2608449C2 (ru) 2017-01-18
WO2013113827A1 (fr) 2013-08-08
EP2809971A1 (fr) 2014-12-10
JP2015507195A (ja) 2015-03-05
IN2014DN06483A (enrdf_load_stackoverflow) 2015-06-12
CN104169618B (zh) 2016-08-24
RU2014135453A (ru) 2016-03-27
SI2809971T1 (sl) 2016-08-31
CA2863412A1 (fr) 2013-08-08

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