EP0730094A1 - Système d'aspiration à niveau variable - Google Patents

Système d'aspiration à niveau variable Download PDF

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Publication number
EP0730094A1
EP0730094A1 EP96301181A EP96301181A EP0730094A1 EP 0730094 A1 EP0730094 A1 EP 0730094A1 EP 96301181 A EP96301181 A EP 96301181A EP 96301181 A EP96301181 A EP 96301181A EP 0730094 A1 EP0730094 A1 EP 0730094A1
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EP
European Patent Office
Prior art keywords
suction
assembly
telescoping pipe
pipe sections
impeller
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.)
Granted
Application number
EP96301181A
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German (de)
English (en)
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EP0730094B1 (fr
Inventor
Timothy John Denmeade
Charles Peter Nyilas
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CBS Corp
Original Assignee
Westinghouse Electric Corp
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Filing date
Publication date
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Publication of EP0730094A1 publication Critical patent/EP0730094A1/fr
Application granted granted Critical
Publication of EP0730094B1 publication Critical patent/EP0730094B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/10—Units comprising pumps and their driving means the pump being electrically driven for submerged use adapted for use in mining bore holes
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/406—Casings; Connections of working fluid 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

Definitions

  • This invention relates to a submersible pump, and more particularly to a variable level suction device used in conjunction with a submersible transfer pump for pumping high-level radioactive fluid from a selected level in a waste tank.
  • a waste tank is used for the treatment and intermediate storage of high-level radioactive fluids and solutions.
  • the waste is generally aqueous with a high concentration of precipitated solids and a small percentage of organic compounds left over from the radiochemical separations processes.
  • a typical waste tank is mounted in a thick-walled concrete cell in order to shield the environment and persons working in the vicinity of the stored fluids against radiation; is approximately 50 to 60 feet deep; and has a diameter ranging from about 75 to about 85 feet with liquid capacities of approximately one million gallons.
  • a motor mixer pump is used to mix or mobilize the liquid waste or sludge at the bottom of the waste tank and a transfer pump is used to remove the liquid waste from the tank and transfer the liquid waste to another tank for reserve or to a separating process where the liquid is separated from the solid radioactive waste which is vitrified and collected in containers which generally are buried in underground concrete vaults.
  • Present day transfer pumps have an air cooled motor mounted on a mounting flange at the top of the waste tank and have a fixed length shaft with an impeller assembly suspended vertically from the mounting flange and submerged in the liquid waste.
  • the fluid is siphoned off of the top surface which is the free surface, or from the intermediate strata within the waste tank.
  • present-day transfer pumps each having a different length as that discussed hereinabove, or involves removal of the transfer pump and the installation of a scavenger pump which may be one of two types of vertical turbine pumps.
  • the first type of vertical turbine pump has a long rigid shaft which is designed such that it can be readily raised or lowered from the top of the tank to permit proper adjustment of the position of the impeller in the tank.
  • the second type of vertical turbine pump is known as a flexible floating turbine scavenger pump which has a long rigid shaft which incorporates a flexible suction line with an integral float element which maintains the inlet to the suction line near the free surface of the tank level or relative to the supernatant level for siphoning of the waste therefrom.
  • This process may involve removing the transfer pump, installing the scavenger pump, and then reinstalling the transfer pump.
  • these pumps In order to satisfy the environmental requirements and regulations, these pumps must undergo a decontamination procedure or the pumps must be replaced.
  • the removing, decontaminating, handling, reinstalling or disposing of these transfer and scavenger pumps may run as high as a million dollars in labor support and equipment costs.
  • Waste management for high radioactive materials is constantly searching for ways in which to simplify the process for transferring both the liquid waste and the supernatant fluid from the waste tank and to do this in such a manner that a single device will satisfy this need.
  • this device would be capable of pumping radioactive fluid from any selected level in a selected range of levels from a free surface to nearly the bottom of a waste tank where the sludge or solid particles settle.
  • U.S. Patent No. 4,235,569 discloses a typical lineshaft pump for pumping radioactive material and which can operate at a discrete level by coupling the appropriate number of shaft sections together.
  • the motor is located out of the tank and a fluid displacement impeller, mounted in a housing, is totally immersed in the fluid to be pumped.
  • the impeller is connected to the motor through the shaft coupling system consisting of the several shaft sections.
  • a disadvantage to this pump design is that the fluid or liquid cannot be easily pumped at a desirable level in the waste tank without removing the pump and adding or subtracting the number of shaft sections to provide the required length or providing an additional pump, the results of which include one or more of the several disadvantages associated with the prior art as discussed hereinabove.
  • U.S. Patent No. 4,030,859 A further device of the prior art which includes means for varying the length of a pipe is disclosed in U.S. Patent No. 4,030,859.
  • This device is used to circulate the water in a lake, pond or reservoir, and employs a pair of telescoping pipes beneath a mixing chamber whose upper edge is above the surface of the lake, pond, or reservoir.
  • a major drawback of this device is that it cannot be easily adapted for use with a transfer pump in a waste tank containing high-level radioactive liquid waste.
  • the present invention has met the above needs.
  • the present invention employs a variable level suction device which may be used in conjunction with a transfer pump for pumping radioactive fluids or liquid wastes from a selected level in a selected range of levels from a free surface to nearly the bottom of a waste tank.
  • the apparatus preferably involves an impeller assembly of a transfer pump which is positioned near the bottom of the tank.
  • the variable suction device preferably, comprises adjustable suction conduit means in the form of a telescoping pipe assembly which comprises several vertical telescoping pipe sections mounted alongside a column assembly of the transfer pump. A suction inlet is in the innermost pipe section, and the outlet is located in the outer most pipe section which is welded to an hydraulic housing.
  • the hydraulic housing preferably encases the housing of an impeller assembly of a lineshaft transfer pump or of a submersible canned motor transfer pump and allows suction to be drawn from suction ports in the hydraulic housing or from the telescoping pipe assembly.
  • Suction ports are located in the hydraulic housing in close proximity to a suction inlet of the impeller assembly.
  • the telescoping pipe sections are mounted around a guide rod which in cooperation with the structure of the pipe sections centers the conduit means and provides vertical tracking and alignment of the pipe sections.
  • a drive unit which, preferably, involves a chain and sprocket device is connected to the innermost pipe section and acts to raise and lower the several telescoping pipe sections relative to the hydraulic housing.
  • Opening of the suction ports which are located adjacent to the impeller assembly and raising of the telescoping pipe sections such that the inlet of the innermost pipe suction is above the free surface of the fluid allows the liquid waste to be drawn into the impeller assembly from the bottom of the waste tank and up through a discharge conduit for discharge out of the transfer pump.
  • an object of the present invention to provide a single, simple means for pumping radioactive fluids from any selected range of levels in a waste tank.
  • a still further object of the invention is to provide a device which operates in conjunction with a transfer pump for pumping radioactive liquid waste from selected levels in a waste tank, which eliminates the need for additional types of pumps and, thus, reduces the high operating costs typically associated with prior pumping processes.
  • a further object of the present invention is to provide a simple design for a multi-level pump suction device which is adaptable to any length transfer pump in any size of waste tank.
  • Transfer pump 1 is preferably used in a waste tank 3 which is partially shown in Figure 1 and which waste tank 3 is located in the ground.
  • Waste tank 3 contains high-level radioactive liquid waste 5 normally consisting of a fluid and sludge at the bottom of tank 3.
  • the liquid waste may consist of insoluble oxides/hydroxides of aluminum, iron, manganese, and zirconium in water mixtures up to 50% solids by volume.
  • the liquid waste is first mixed by a mixer pump (not shown) and then drawn out of tank 3 by transfer pump 1.
  • Transfer pump 1 is comprised of a column assembly 7, motor housing means 9 connected to column assembly 7 and which includes a canned electric motor 11 with radial bearing assemblies 13 and 15 and a thrust bearing assembly 17, and an impeller assembly 18 mounted to motor housing means 9. Impeller assembly 18 is positioned near the bottom 6 of tank 3, and the total length of transfer pump 1 depends on the number and the length of the several pipe sections comprising column assembly 7, as disclosed in the related patent application entitled "A Submersible Canned Motor Transfer Pump".
  • Electric motor means 11 is the driving means for transfer pump 1, and is comprised of a canned stator assembly and a canned rotor assembly, which prevent the liquid waste from contacting the electrical components of electric motor means 11 and which permit the liquid waste to flow into the annulus formed by the canned stator assembly and the canned rotor assembly to cool the electric motor means 11, as taught in the above related patent application.
  • the stator assembly comprises an outer annular shell 14 and an inner annular stator can 16, both of which are welded to upper and lower annular closure members 19 and 21, respectively.
  • the electrical power supply to electric motor means 11 is supplied to stator assembly by a power cable 23 which extends through upper annular closure member 19.
  • the rotor assembly comprises a rotor (not shown) in can 25, a shaft 27 extending through and from rotor can 25, journals 29 and 31 connected to the ends of shaft 27, an upper impeller 33 connected on shaft 27, and a lower impeller 35 mounted on the end of shaft 27.
  • the rotor in can 25 may be of the squirrel cage type.
  • Rotor can 25 is welded to shaft 27 to hermetically seal and isolate the components of the rotor from the liquid waste.
  • Upper journal 29 includes the radial bearing assembly 13
  • lower journal 31 includes radial bearing assembly 15 and thrust bearing assembly 17.
  • Journals 29 and 31 are, preferably, made of a hard material, such as tungsten carbide, and constitute rotating bearing members 37, 39 with bearing surfaces for radial bearing assemblies 13 and 15, respectively.
  • Radial bearing assemblies 13 and 15 further include a stationary bearing member 41 and 43, respectively, which run against the rotating bearing members 37, 39 of journals 29, 31, respectively on shaft 27, and which bearing members 41, 43 are mounted in annular member 19 and 21, respectively.
  • Static bearing members 41, 43 are preferably made of a hard material, such as tungsten carbide; and undergo a shrink fit process for mounting thereof on annular closure members 19 and 21, respectively.
  • Thrust bearing assembly 17 is located adjacent to lower radial bearing assembly 15. Thrust bearing assembly 17 is comprised of a thrust runner 45, and several thrust shoes, some of which are indicated at numerals 47 and 49. Thrust runner 45 through appropriate means is secured to shaft 27, and has a continuous ring member 51 which run against the thrust shoes 47 and 49.
  • the bearing surfaces of bearing assemblies 13, 15, and 17 are made of a hard material, such as tungsten carbide or silicon carbide.
  • the hard-on-hard radial bearing assemblies 13 and 15 employ axial slots (not shown) in the static bearing members 41 and 43 which allow the large particles of the liquid waste which are greater than the clearances in the system to be ground down into smaller particles and/or to be flushed out by the liquid waste without damage to the components of transfer pump 1.
  • impeller assembly 18 located adjacent to thrust bearing assembly 17 and mounted on rotor shaft 27 is impeller assembly 18 which is comprised of upper impeller 33 and lower impeller 35, a diffuser casing 53 which forms a first and second stage diffusion area with impellers 33 and 35, a suction adapter 55, an inlet screen 57, and support fins 59.
  • Upper impeller 33 is a second stage impeller and is keyed to shaft 27 to prevent rotation relative to shaft 27. Upper impeller 33 is greater in diameter than lower impeller 35, and its diameter is such that it accounts for the hydraulic losses associated with the dumped diffusion casing 53 and a vertical discharge pipe assembly (not shown).
  • Lower impeller 35 is keyed to shaft 27 to prevent relative rotation therebetween, and is spaced axially from upper impeller 33.
  • the upper shroud of lower impeller 35 is located less than six inches from the inlet of suction adaptor suction adapter 55 of impeller assembly 18. This insures that transfer pump 1 is able to empty tank 3 to below a six inch liquid waste level in tank 3 since it is necessary for the impeller 35 to be completely covered by the liquid waste in order for the impeller assembly 18 to be able to pump the liquid waste 5.
  • Fins 59 are bolted to suction adapter 55 and act as guides for transfer pump 1 when transfer pump 1 is installed into tank 3, and act to reduce the vortexing of the liquid waste 5 when transfer pump 1 is operated at low liquid waste levels. That is, at low levels, the liquid waste 3 tends to swirl, and fins 59 counteract the whirlpool or swirling effect.
  • Impeller assembly 18 has two stages where the first staged diffusion area has several vanes, which in cooperation with casing 53 turn the flow of the liquid waste from the lower impeller 35 into the upper impeller 33 which with casing 53 acts as a second stage dumped diffusion area, from which area, the liquid waste flows up into several discharge pipes of a discharge assembly (not shown).
  • the impeller assembly 18 draws liquid waste into suction adapter 55 through the first stage diffusion area of lower impeller 35 and into the second stage diffusion area of upper impeller 33, where most of the liquid waste is taken up through the several vertical discharge pipes of the discharge assembly (not shown). However, some of the liquid waste is forced upwardly through thrust and radial bearing assemblies 17 and 15, respectively, and through the annulus formed by the stator can 16 and rotor can 25, wherein the large particles are reduced in size by the bearing members of bearing assemblies 15 and 17, and wherein the liquid waste cools electric motor means 11 and cools and/or lubricates bearing assemblies 13, 15, and 17.
  • the discharge assembly (not shown) communicates with several cylinder sections 61 and 63 of column assembly 7 shown in Figure 1, which cylinder sections 61 and 63 each have a central conduit for receiving and carrying the liquid waste out of transfer pump 1.
  • Figures 1, 2, 3, and 3A show a variable level suction device 65 which essentially is an adjustable suction conduit means and which encompasses the present invention.
  • variable level suction device 65 comprises an hydraulic housing 67 essentially encasing the lower portion of impeller assembly 18 including lower impeller 35, and a telescoping pipe assembly 69 which essentially is a suction conduit means.
  • Hydraulic housing 67 contains a suction chamber 71 and suction ports 73. Hydraulic housing 67 forms chamber 71 around lower impeller 35 from which chamber 71, impeller 35 draws its pumped liquid waste, and which hydraulic housing 67 allows suction to be drawn from either the bottom of tank 3 through suction ports 73 or from telescoping pipe assembly 69.
  • telescoping pipe assembly 69 consists of several vertical pipe sections 75, 77, 79, and 81.
  • An innermost pipe section 75 has an inlet 83, and the outermost pipe section 81 is welded to hydraulic housing 67 and has an outlet 84, which is in flow communication with the suction chamber 71 formed in hydraulic housing 67.
  • Telescoping pipe assembly 69 is mounted alongside column assembly 7 and motor housing means 9 of transfer pump 1, and is vertically adjustable via a chain and sprocket assembly 85 ( Figure 3) which is driven by a motor 87 ( Figure 1) mounted on a mounting flange 89, which flange 89 supports and suspends the several devices used in waste tank 3, including transfer pump 1 in a manner well-known in the art. As is shown in Figure 1, flange 89 also supports electrical connection means 91 for electrical cable 23 and the discharge pipe 61 of column assembly 7.
  • a chain 93 is connected to innermost pipe section 75 by way of a bracket 95 which encircles and is welded to the upper outer surface of pipe section 75.
  • Chain 93 is driven around a sprocket 94 connected to outer pipe section 81 and is driven by motor 87 shown in Figure 1. Operation of chain and sprocket assembly 85 expands and retracts pipe assembly 69.
  • Pipe sections 75, 77, 79, and 81 from the outermost pipe section 81 to the innermost pipe section 75 have decreasing diameters so that pipe sections 75-81, when in a compressed and uncompressed state, fit within each other.
  • the inner end of each pipe section 75, 77, and 79 have a flange and the outer end of each pipe section 77, 79, and 81 have a flange which overlap and cooperate with the flange of pipe sections 75, 77, and 79 to retain pipe sections 75, 77, and 79 within each other when pipe assembly 69 is being expanded vertically upwardly in tank 1 of Figure 1.
  • Figure 3A shows an example of this relationship where an outer flange 78 of pipe section 77 overlaps inner flange 76 of pipe section 75.
  • the diameters or bores of pipe sections 75-81 are relatively small, for example about 2-1/2 to 4 inches, and therefore have close tolerances between each cooperating adjacent pipe section which minimizes leakage through the joints of pipe assembly 69 and which feature, in part, makes the pipe assembly 69 flexible enough to accommodate vast movements of the column assembly 7.
  • Pipe sections 75-81 are concentrically assembled over a guide rod 97. Still referring to Figure 3A, the inner flange 76 of pipe section 75 has a radial rib 80 which is slightly spaced away from guide rod 97. Several of these radial ribs 80 are spaced around flange 76 in a manner similar to that shown in Figure 3A.
  • These radial ribs 80 are provided on the inner flange of pipe sections 75, 77, and 79, and cooperate with guide rod 97 to center pipe assembly 69 and to provide vertical tracking and alignment for bracket 95 and chain 93 in raising and lowering pipe sections 75, 77, and 79 in a telescoping fashion relative to fixed pipe section 81.
  • These radial ribs in each pipe section 75, 77, and 79 are spaced around its respective inner flange such as to provide flow areas in the bores of pipe sections 75, 77, 79, and 81.
  • pipe sections 75, 77, and 79 are extended and retracted within pipe section 81 through operation of chain and sprocket assembly 85 of Figure 3.
  • the flange 76 of the inner end of innermost pipe section 75 engages the flange 78 on the outer end of pipe section 77.
  • Further upward movement of chain 93 causes pipe section 77 and 79 to be raised in a similar manner. This process can be continued until all pipe sections 75, 77, and 79 are raised out of fixed pipe 81, while motor 87 holds chain 93 in this fixed position.
  • chain 93 is operated to expand or retract the pipe sections 75, 77, and 79 and then held in a desired position for obtaining a fixed length for pipe assembly 69, depending on the level in tank 3 in which liquid waste 5 is to be drawn into inlet 83 of pipe section 75.
  • motor 87 operates chain and sprocket assembly 85 to progressively raise and lower pipe sections 75, 77, and 79 in and out of fixed pipe section 81 within a range of liquid waste levels in waste tank 3.
  • This range level may be defined as being from a top surface 4, which is commonly referred to as a "free surface” to a bottom surface which may be a couple of feet from the bottom 6 of waste tank 3, depending on the minimum length of telescoping pipe assembly 69 in a compressed state.
  • Impeller assembly 18 must be positioned at least approximately six inches from the bottom of waste tank 3 in order for transfer pump 1 to be effectively operated, and pipe sections 75, 77, and 79 are articulated from a compressed state in pipe section 81 to any elevation starting from the top end of the compressed state up to or above the free surface 4 in tank 3.
  • a chain and sprocket assembly 85 is discussed herein, it will be appreciated that other suitable motive means may be used, such as an hydraulic piston cylinder assembly.
  • hydraulic housing 67 has suction ports 73, which are located in the lower portion of hydraulic housing 67 and near to the inlet to suction adapter 55 of impeller assembly 18.
  • Suction ports 73 each have a gate 99 which is slidably operated in hydraulic housing 67 through an activator rod 101 welded to gate 99.
  • Actuator rods 101 are interconnected and, are, in turn, connected to an actuator rod 102.
  • Actuator rod 102 as shown in Figure 1, extends vertically alongside column assembly 7 and is operated by a worm-gear 103 driven by motor 105.
  • Each gate 99 is guided in its vertical movement by an angle member 107 which is welded inside hydraulic housing 67.
  • Liquid waste can be drawn from the free surface or from any level between the free surface down to a level where telescoping pipe assembly 69 is in a compressed state and where inlet 83 of pipe section 75 is still able to operate to suction liquid waste sufficiently into hydraulic housing 67.
  • pipe section 75 is raised or lowered in the desired level, and suction ports 73 in hydraulic housing 67 are closed in order to obtain a closed loop between the suction area of inlet 83 of pipe section 75 and the discharge area through transfer pump 1.
  • the liquid waste 5 is drawn up into pipe assembly 69, into hydraulic housing 67, into impeller assembly 18, and out through column assembly 7.
  • transfer pump 1 takes suction from the hydraulic housing 67, which is in communication with suction inlet 83 of telescoping pipe assembly 69.
  • the velocity of the liquid waste 5 in pipe assembly 69 is relatively low; for example, less than 5 feet per second, causing the maximum hydraulic loss in pipe assembly 69 to occur when suction inlet 83 is positioned at or near the top or free surface 4 of waste 5 in tank 3.
  • This hydraulic loss is minimal.
  • a 30 foot column of liquid waste 5 in pipe assembly 69 (a hydrostatic pressure of approximately 11 psi) produces less than 1 psi drop in suction pressure in hydraulic housing 67.
  • the pressure losses in pipe assembly 69 diminish and remain relatively small compared to the magnitude of the hydrostatic pressure in hydraulic housing 67.
  • the bottom wall 68 of hydraulic housing 67 is in an inverted "V" configuration which aids in directing the flow of waste 5 into impeller assembly 18.
  • the lowest suction level for telescoping pipe assembly 69 is limited by the length of the lowest pipe section 81. In general, the lowest suction level for pipe assembly 69 will be a few feet, for example, approximately 3 to 4 feet, above the bottom 4 of tank 3. The lowest suction level for drawing in waste 5 through suction ports 73 in hydraulic housing 67 will be greater than six inches from bottom 4 of tank 3 since impeller assembly 18 should be at least six inches from the bottom in waste 5 in order for pump 1 to function properly.
  • FIGS 4 and 5 illustrates the variable level suction device 69 of the present invention as being used in conjunction with a lineshaft type of transfer pump 111.
  • Device 69 is similar to that of Figures 1-3A, and therefore like numerals designate like components.
  • Transfer pump 111 comprises an electric motor means 113, a column assembly 115, through which a lineshaft 117 extends, and an impeller assembly 119 electrically connected to motor means 113 through lineshaft 117.
  • motor means 113 is mounted on a mounting flange 121 out of and on top of a waste tank 123, where it is air cooled.
  • Column assembly 115 extends into waste tank 123 to position impeller assembly 119 in the liquid waste 125 of waste tank 123.
  • the number of pipe segments of column assembly 115 can be selected in order to obtain a desirable fixed length for transfer pump 111 of Figure 4.
  • this fixed length will position impeller assembly close to tank floor 6 for drawing liquid waste from this area while device 69 is operated to draw in liquid waste from an area above hydraulic housing 67 in the manner described hereinabove with regard to device 69 for the transfer pump 1 of Figures 1-3A.
  • Hydraulic housing 67 encases impeller assembly 119 which is in flow communication with the discharge conduit means extending through column assembly 115, in a manner well-known in the art.
  • variable level suction device 69 is operated in a manner similar to that described hereinabove with reference to Figures 1-3A for the submersible canned motor transfer pump, whereby the liquid waste is drawn through impeller assembly 119 and directly up into and through column assembly 115 of transfer pump 111.
  • variable level suction device 69 of the present invention can be used with any type of pump for drawing liquids or fluids out of a container.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19960301181 1995-03-03 1996-02-22 Système d'aspiration à niveau variable Expired - Lifetime EP0730094B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39847995A 1995-03-03 1995-03-03
US398479 1995-03-03

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EP0730094A1 true EP0730094A1 (fr) 1996-09-04
EP0730094B1 EP0730094B1 (fr) 2000-04-19

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CA (1) CA2170833A1 (fr)
DE (1) DE69607779T2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1568888A1 (fr) * 2004-02-27 2005-08-31 Offshore Resource Group AS Appareil et procédé pour récupérer du matériel radioactif d'un endroit fermé
GB2449845A (en) * 2007-05-25 2008-12-10 Ukaea Ltd Means for removing residual liquid metal coolant from a nuclear reactor
WO2012130225A2 (fr) * 2011-03-31 2012-10-04 Ixetic Bad Homburg Gmbh Dispositif d'entraînement d'une pompe immergée dans l'huile
CN105736401A (zh) * 2016-04-18 2016-07-06 大连深蓝泵业有限公司 海洋工况用电动超低温潜液泵轴向力平衡机构
EP3059448A1 (fr) * 2015-02-18 2016-08-24 Sulzer Management AG Dispositif pour modifier la fréquence naturelle d'une pompe verticale, pompe verticale et procédé pour le rétrofittage d'une pompe verticale

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8944758B2 (en) 2011-03-01 2015-02-03 Ian Nuhn Pump for immersion within a fluid reservoir

Citations (6)

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Publication number Priority date Publication date Assignee Title
US4030859A (en) * 1975-09-02 1977-06-21 Lake Aid Inc. Floating aerator having means to vary the length of the draft pipe
FR2453669A1 (fr) * 1979-04-12 1980-11-07 Iakovenko Marinitch Nicolas Appareil pour le malaxage, le pompage et l'introduction d'elements additifs dans un milieu fluide
US4235569A (en) * 1977-03-31 1980-11-25 Alois Schillinger Submersible pump for radioactive liquids
DE3209283A1 (de) * 1982-03-13 1983-09-22 Jürgen Dipl.-Ing. 4350 Recklinghausen Enning Vorrichtung zur hypolimnion-belueftung
US4924898A (en) * 1987-06-16 1990-05-15 The Gni Group, Inc. Vacuum assisted material mover
US5133854A (en) * 1990-07-13 1992-07-28 Tibor Horvath Skimmer with self-adjusting floating collector

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030859A (en) * 1975-09-02 1977-06-21 Lake Aid Inc. Floating aerator having means to vary the length of the draft pipe
US4235569A (en) * 1977-03-31 1980-11-25 Alois Schillinger Submersible pump for radioactive liquids
FR2453669A1 (fr) * 1979-04-12 1980-11-07 Iakovenko Marinitch Nicolas Appareil pour le malaxage, le pompage et l'introduction d'elements additifs dans un milieu fluide
DE3209283A1 (de) * 1982-03-13 1983-09-22 Jürgen Dipl.-Ing. 4350 Recklinghausen Enning Vorrichtung zur hypolimnion-belueftung
US4924898A (en) * 1987-06-16 1990-05-15 The Gni Group, Inc. Vacuum assisted material mover
US5133854A (en) * 1990-07-13 1992-07-28 Tibor Horvath Skimmer with self-adjusting floating collector

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1568888A1 (fr) * 2004-02-27 2005-08-31 Offshore Resource Group AS Appareil et procédé pour récupérer du matériel radioactif d'un endroit fermé
GB2449845A (en) * 2007-05-25 2008-12-10 Ukaea Ltd Means for removing residual liquid metal coolant from a nuclear reactor
WO2012130225A2 (fr) * 2011-03-31 2012-10-04 Ixetic Bad Homburg Gmbh Dispositif d'entraînement d'une pompe immergée dans l'huile
WO2012130225A3 (fr) * 2011-03-31 2013-06-20 Ixetic Bad Homburg Gmbh Dispositif d'entraînement d'une pompe immergée dans l'huile
US9587638B2 (en) 2011-03-31 2017-03-07 Magna Powertrain Bad Homburg GmbH Drive unit for a submersible oil pump, with a fluid passage allowing the fluid in the motor housing to be discharged to the ambient enviroment
EP3059448A1 (fr) * 2015-02-18 2016-08-24 Sulzer Management AG Dispositif pour modifier la fréquence naturelle d'une pompe verticale, pompe verticale et procédé pour le rétrofittage d'une pompe verticale
CN105736401A (zh) * 2016-04-18 2016-07-06 大连深蓝泵业有限公司 海洋工况用电动超低温潜液泵轴向力平衡机构

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DE69607779D1 (de) 2000-05-25
DE69607779T2 (de) 2000-12-28
CA2170833A1 (fr) 1996-09-04
EP0730094B1 (fr) 2000-04-19

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