US20090110574A1 - Centrifugal pump systems - Google Patents
Centrifugal pump systems Download PDFInfo
- Publication number
- US20090110574A1 US20090110574A1 US11/977,424 US97742407A US2009110574A1 US 20090110574 A1 US20090110574 A1 US 20090110574A1 US 97742407 A US97742407 A US 97742407A US 2009110574 A1 US2009110574 A1 US 2009110574A1
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- Prior art keywords
- housing
- pump shaft
- pump
- packing structure
- pumping system
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- 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.)
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/106—Shaft sealings especially adapted for liquid pumps
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/06—Lubrication
- F04D29/061—Lubrication especially adapted for liquid pumps
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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
- 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
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
Definitions
- the present invention is directed to centrifugal pumps; to systems using them; and, in certain particular aspects, to such systems for pumping solids-laden drilling fluids.
- Pumping systems which employ centrifugal pumps are used to pump mixtures and slurries that contain solids.
- such systems pump fluids used in the drilling of earth wellbores, tunneling and excavating.
- Drilling fluids can contain hazardous material, oil, solids, debris, rock, and shale cuttings.
- the present invention discloses, in certain aspects, systems for pumping mixtures with solids therein.
- such systems include a container or tank for receiving and holding the mixture; apparatus for moving the mixture within and from the container; and one or more centrifugal pumps for transferring the mixture from the container to storage or disposal (and/or to mix the mixture within the container to make it homogeneous).
- the mixture contained within a container is a slurry which includes a fluid or fluids and solids in the fluid.
- the mixture is a slurry of drilling fluid from a wellbore with solids (e.g. drilled cuttings, drilled debris, etc.) therein.
- the present invention discloses a centrifugal pump with a packing structure for a pump shaft.
- the packing structure includes seals that act as containment barriers to prevent outside contamination from entering a pump housing and contacting the shaft and other parts.
- the packing structure is sealed within a non-vented space below bearings, a space in which a positive pressure is maintained. Also, with seals isolated and under pressure, and located in a non-vented space, as temperature builds up during operation, lubricant adjacent the seals expands, increasing pressure as compared to pressure external to the packing structure, which contributes to maintaining the seals in isolation and to prohibiting contaminants from entering the system and flowing to the bearings.
- the life of parts e.g. shafts and bearings, can be extended.
- the present invention discloses pumping systems for pumping a drilling mixture containing liquid drilling fluid and solids (e.g., debris, drilled cuttings, etc.) entrained in the liquid drilling fluid, the pumping systems including: a container for receiving and holding the drilling mixture; centrifugal pump apparatus for transferring the drilling mixture from the container, the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft, a housing, the housing comprising an enclosed non-vented structure; and the packing structure, bearing apparatus and part of the pump shaft within the housing.
- a container for receiving and holding the drilling mixture
- centrifugal pump apparatus for transferring the drilling mixture from the container
- the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft, a housing, the housing comprising an enclosed non-vented structure; and the packing structure, bearing apparatus and part of the pump shaft within the housing.
- centrifugal pump apparatus including: a pump shaft; a motor to drive the pump shaft; a packing structure around the pump shaft; bearing apparatus for the pump shaft; a non-vented housing able to contain lubricant and/or grease under pressure; and the packing structure, bearing apparatus and part of the pump shaft within the housing.
- the present invention discloses methods for pumping a mixture containing liquid and solids (in one particular aspect, a mixture of drilling fluid and drilled solids), the method including: feeding the mixture from a container for receiving and holding the mixture to a centrifugal pump apparatus for transferring the mixture from the container, the centrifugal pump apparatus being any according to the present invention; and with the centrifugal pump, pumping the mixture from the container.
- the present invention discloses, in certain aspects, pumping systems for pumping a mixture containing liquid and solids, the pumping systems including: a container for receiving and holding the mixture; centrifugal pump apparatus for transferring the mixture from the container; the centrifugal pump apparatus including a non-vented housing that is able to hold pressure.
- Such pumping systems with a pump having an isolated packing structure with a relatively high internal pressure which effectively prevents contaminants from entering the system and flowing to items above the packing structure, e.g. preserving vital parts, e.g. bearings and shafts;
- such a pump in which lubricant heated during operation increases pressure on the packing structure.
- FIG. 1 is a perspective view of a pumping system according to the present invention.
- FIG. 2 is a perspective view of the system of FIG. 1 .
- FIG. 3 is a side schematic side view of part of the system of FIG. 1 .
- FIG. 4 is a perspective view of a pump according to the present invention of the system of FIG. 1 .
- FIG. 5 is a front view of the pump of FIG. 4 .
- FIG. 6 is an underside view of the pumps of FIG. 4 .
- FIG. 7 is a cutaway view along line 7 - 7 of FIG. 5 .
- FIG. 8 is a cross-sectional view of the pump along line 8 - 8 of FIG. 6 .
- FIG. 9A is a side view of a pump according to the present invention.
- FIG. 9B is a cross-sectional view along line 9 B- 9 B of the pump of FIG. 9A .
- FIG. 9C is an enlarged view of part of the pump of FIG. 9B .
- FIG. 10A is an exploded perspective view of part of the pump of FIG. 9A .
- FIG. 10B is an enlarged perspective view of part of the pump of FIG. 10A .
- FIG. 11 is a cross-section view of a prior art seal useful with the pump of FIG. 9A .
- FIGS. 1-2 illustrate a system 10 according to the present invention which has a container 8 ; a handling system 4 ; and an auger 6 .
- a container 8 is an elongated tank for receiving and holding a mixture with liquid and solids.
- the container 8 is designed so that it can be easily transported from location to location; e.g., land locations, on an offshore platform, or to and from other remote locations.
- the container 8 has a pair of rails 18 supported by braces 20 .
- the handling system 4 which moves on the rails 18 , is mounted on a platform or trolley 22 which has a set of wheels 24 .
- the platform 22 has a pair of sprocket wheels 26 which are propelled by a motor and which engage the rails 18 to move the handling system 4 back and forth from one end of the container 8 to the other.
- the handling system 4 includes a shovel 28 for moving material within and from one end to the other end of the container.
- the handling system 4 includes a pump system 30 according to the present invention for pumping material from the container 8 .
- the pump system 30 includes at least one pump according to the present invention.
- the handling system 4 and the shovel 28 have moved within the container 8 , pushing material toward one end of the container 8 .
- the auger 6 may be activated to move material from the container 8 .
- FIG. 3 shows shovel 28 connected to a boom ladder 40 , extending from a first extension member 42 .
- the boom ladder 40 and the first extension member 42 are pivotally attached by a pin 44 .
- the first extension member 42 is attached to the platform 22 .
- a shovel blade 48 is attached to a second extension member 46 .
- An optional detachable shovel blade 50 is attached to the boom member 40 via a third extension member 52 .
- the pump system 30 includes a pump motor 54 which is adapted to a pump case cylinder 56 .
- a guard 58 is, optionally, included so that a suction inlet 60 is raised enough off the bottom so that large solids do not enter the pump or block off the suction inlet 60 .
- a disposal conduit 62 leading from the pump case cylinder 56 , conducts material to a swivel joint conduit 64 for ultimate disposal.
- an oscillator 70 oscillates the boom ladder 40 .
- the motor 54 of the pump system 30 is operatively associated with an impeller assembly 200 .
- the pump motor 54 may be any suitable commercially available motor.
- the shaft from the motor extends to the pump case cylinder 56 , with the impeller 200 encased within the pump case cylinder 56 .
- a shaft cover 250 extends from the motor 54 to a top 252 of the pump case cylinder 56 .
- the cover 250 contains supports and a top flange 254 and a bottom flange 256 , with the top flange 254 connected to a motor flange 258 .
- Lines for the motor include an input line 260 and output line 262 for hydraulic power fluid input and output.
- the disposal conduit 62 leads from the pump case cylinder 56 .
- the pump case cylinder 56 has an extension section 264 that stretches to the generally vertically oriented disposal conduit 62 .
- the extension section 264 also extends to a slurry gate 122 with a passage 124 .
- Brackets 265 , 266 are used for mounting the hydraulic motor and legs 58 .
- FIG. 5 depicts the impeller assembly 200 and the protrusion of blade ends from a pump case bottom 267 .
- the slurry gate 122 provides an outlet for the system.
- FIG. 6 the underside portion of the pump system 30 is illustrated and the impeller assembly 200 is shown projecting from the bottom of the pump case.
- the extension section 264 extends from the cylindrical pump case cylinder 56 .
- the slurry gate 122 contains a rod 268 that is used to position the gate in an open or closed position. Alternatively, an hydraulic cylinder apparatus is used to move the gate. The pump both mixes the slurry and discharges it.
- a plate 202 is disposed within the pump case cylinder 56 .
- An outer periphery 270 is placed in relatively close relationship with an inner cylindrical wall 272 of the pump case cylinder 56 .
- Material e.g. mixture; slurry
- Arrows 274 depicted the travel area of the slurry about the inner circular wall 272 to the extension section 264 which in turn allows passage to the disposal conduit 62 .
- the extension section 264 and the disposal conduit 62 are in fluid communication with one another. The material is then lifted by the pump system 30 up into and out of the conduit 62 .
- FIG. 8 shows the pump system 30 with a rotative shaft 276 that extends from the motor 54 .
- the shaft cover 250 is generally a cylindrical member with an inner bore.
- the inner bore has disposed therein a first set of roller bearings 278 and second set of roller bearings 280 that are separated by a spacer 282 .
- the shaft 276 is threadedly connected to the impeller assembly 200 so that, when the shaft 276 is rotated by the motor, the impeller assembly 200 and associated blades rotate thereby loading the pump case cylinder 56 with the material as previously described.
- a generally circular opening 284 is at the bottom 267 of the case 56 .
- a wear plate 286 is, optionally, added which adds to the structure and reinforces the pump case 56 thereby protecting from the erosional forces produced during pumping.
- the slurry gate 124 provides a mixing outlet for the material.
- the pump system 30 includes a packing structure 170 according to the present invention which may be any packing structure according to the present invention disclosed herein.
- the packing structure 170 surrounds the shaft 276 .
- FIGS. 9A and 9B show a pump system 300 according to the present invention which has a driving shaft 332 driven by a motor 334 .
- the driving shaft 332 is connected to an impeller assembly (not shown; any suitable impeller, e.g., but not limited to, like the impeller assembly 200 , FIG. 7 ).
- the driving shaft 332 extends through a housing 336 and has a lower threaded end 338 for connection to an impeller assembly.
- the motor 334 is mounted on a plate 342 .
- Flanges 344 are connected to the housing 336 and a base 346 .
- a bearing spacer 350 spaces-apart upper bearings 352 and lower bearings 354 which facilitate rotation of the driving shaft 332 .
- Lubricant is contained in a space 356 and encompasses the bearings.
- This lubricant e.g. high viscosity lubricant e.g., gear oil
- a removable snap ring 364 holds the bearings 352 , 354 and the bearing spacer 350 in place. Lubricant can flow from the port 358 down to the lowest of the lower bearings 354 .
- the space 356 includes the bearings 352 , 354 and the open area below the bearings 352 and space above the bearings 354 .
- a packing structure 310 surrounds the driving shaft 332 ; maintains the bearings in place; and prevents contaminants from entering the space 356 which could damage or erode parts of the system, e.g. the shaft 332 and/or the bearings.
- FIGS. 9C , 10 A and 10 B show the packing structure 310 in detail.
- at least one seal can be used and at least one seal retainer ring can be used.
- FIG. 9B and FIG. 9C there are a plurality of seals 311 , 312 , 313 , 314 held in place by retainer rings or “floor members,” a top floor member 316 and a bottom floor member 318 .
- the seals 311 - 314 are made of hard rubber and steel and the floor members are made of high wear resistant material such as, e.g., 4140 steel.
- a single floor member may be used.
- the floor members have cutouts or recesses R for the seals.
- the floor members 316 , 318 are exteriorly threaded and engage interior threading 337 a and 337 b on the housing 336 .
- a retainer or “hat” 322 is used between the exterior of the shaft 332 and the seals 311 - 314 .
- a top end of the retainer 322 abuts a shoulder 332 a of the shaft 332 .
- the retainer has a base 322 b and a cylinder 322 c .
- the cylinder 322 c encircles part of the shaft 332 .
- the retainer 322 rotates with the shaft 332 .
- An impeller e.g. an impeller/assembly as in FIG. 4
- the retainer 322 acts as a barrier inhibiting or preventing contaminants and debris from contacting the pump shaft.
- the upper and lower floors exceed the interior diameter of the bearings and provide housings for the double set of seals that isolate the bearing area.
- the floor members also act as temporary supports and guides for the shaft 332 , e.g. if a bearing failure occurs. This auxiliary back-up support and guidance function allows for the pump operation to continue until a safe shut down can be made for replacement.
- FIG. 11 shows a seal member 360 which has a body 326 with a rubber ring 364 in a recess 366 .
- the seal member 360 is used with the rubber ring 364 facing upwardly.
- the seal 311 prevents bearing lubricant from flowing down into the packing system 300 .
- Any suitable seal may be used instead of the seal members 360 .
- the present invention therefore, provides in at least certain embodiments, a pumping system for pumping a drilling mixture containing liquid drilling fluid and solids entrained in the liquid drilling fluid, the pumping system including: a container for receiving and holding the drilling mixture; centrifugal pump apparatus for transferring the drilling mixture from the container; the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft; a housing, the housing which is an enclosed non-vented structure; and the packing structure, bearing apparatus and part of the pump shaft within the housing.
- Such a system may have one or some, in any possible combination, of the following: seal apparatus for sealing the housing to prevent the ingress of contaminants into the housing; a lubricant port through the housing for providing lubricant to the bearing apparatus; lubricant within the housing for lubricating the bearing apparatus, the lubricant expandable upon heating to increase pressure within the housing to inhibit contaminants from entering the housing through the pump-shaft/housing interface; the seal apparatus containing at least one seal; the packing structure surrounding the pump shaft and maintaining the bearing apparatus in position adjacent the pump shaft and above the packing structure; the packing structure inhibiting contaminants from flowing to the bearing apparatus; a retainer with a base and a cylinder, the cylinder encircling a portion of the drive shaft and the base abutting a bottom of the packing structure; the retainer acting as a barrier inhibiting contaminants from contacting the pump shaft; seal apparatus for sealing the housing to prevent the ingress of contaminants into the housing, the seal apparatus including at least one seal, and the at least one seal sealingly contacting an exterior surface
- the present invention therefore, provides in at least certain embodiments, a pumping system for pumping a drilling mixture containing liquid drilling fluid and solids entrained in the liquid drilling fluid, the pumping system including: a container for receiving and holding the drilling mixture; centrifugal pump apparatus for transferring the drilling mixture from the container; the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft; a housing which is an enclosed non-vented structure; the packing structure, bearing apparatus and part of the pump shaft within the housing; seal apparatus for sealing the housing to prevent the ingress of contaminants into the housing; the packing structure surrounding the pump shaft and maintaining the bearing apparatus in position adjacent the pump shaft and above the packing structure; the packing structure inhibiting contaminants from flowing to the bearing apparatus; a retainer with a base and a cylinder, the cylinder encircling a portion of the drive shaft and the base abutting a bottom of the packing structure; and the retainer acting as a barrier inhibiting contaminants from contacting
- a centrifugal pump apparatus including: a pump shaft; a motor to drive the pump shaft; a packing structure around the pump shaft; bearing apparatus around the pump shaft; a housing which is a non-vented housing; and the packing structure, bearing apparatus and part of the pump shaft within the housing.
- the present invention therefore, provides in at least certain embodiments, a method for pumping a mixture containing liquid and solids, the method including: feeding the mixture from a container for receiving and holding the mixture to a centrifugal pump apparatus for transferring the mixture from the container, the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a housing, a packing structure around the pump shaft and bearing apparatus around the pump shaft, the housing comprising a non-vented housing, the packing structure, bearing apparatus and part of the pump shaft within the housing; and, with the centrifugal pump, pumping the mixture from the container.
- the present invention therefore, provides in at least certain embodiments, a pumping system for pumping a mixture containing liquid and solids, the pumping system including: a container for receiving and holding the mixture; centrifugal pump apparatus for transferring the mixture from the container; the centrifugal pump apparatus including housing, a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft, the housing being a non-vented enclosure; and the packing structure, bearing apparatus and part of the pump shaft within the housing.
- a nail and a screw may not be structural equivalents in that a nail employs a cylindrical surface to secure wooden parts together, whereas a screw employs a helical surface, in the environment of fastening wooden parts, a nail and a screw may be equivalent structures. It is the express intention of the applicant not to invoke 35 U.S.C. ⁇ 112, paragraph 6 for any limitations of any of the claims herein, except for those in which the claim expressly uses the words ‘means for’ together with an associated function.
Abstract
A pumping system for pumping a mixture, e.g. a drilling fluid mixture, containing liquid and solids, the pumping system including a container, centrifugal pump apparatus for pumping the mixture, the pump apparatus including a pump shaft, a drive motor, a shaft packing structure, and bearing apparatus around the pump shaft, the packing structure, bearing apparatus and part of the pump shaft within an enclosed non-vented housing. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 CFR 1.72(b).
Description
- 1. Field of the Invention
- The present invention is directed to centrifugal pumps; to systems using them; and, in certain particular aspects, to such systems for pumping solids-laden drilling fluids.
- 2. Description of Related Art
- The prior art discloses a wide variety of centrifugal pumps; systems that employ them; and systems with such pumps for pumping drilling fluid laden with drilled solids and other solid components; for example, and not by way of limitation, see U.S. Pat. Nos. 5,456,580; 5,662,807; 5,846,440; 6,096,228; 6,170,580; 6,179,071; 6,276,824; 6,345,672; 6,406,255; and 6,808,354, all of said patents incorporated fully herein for all purposes.
- Pumping systems which employ centrifugal pumps are used to pump mixtures and slurries that contain solids. In certain particular aspects, such systems pump fluids used in the drilling of earth wellbores, tunneling and excavating. Drilling fluids can contain hazardous material, oil, solids, debris, rock, and shale cuttings.
- The safe and efficient handling of drilling fluid and its proper disposal result in significant expense in drilling a wellbore.
- There has long been a need, recognized by the present inventors, for effective and efficient systems employing centrifugal pumps for pumping mixtures with solids therein. There has long been a need, recognized by the present inventors, for effective and efficient systems for pumping solids-laden drilling fluids.
- The present invention discloses, in certain aspects, systems for pumping mixtures with solids therein. In certain aspects, such systems include a container or tank for receiving and holding the mixture; apparatus for moving the mixture within and from the container; and one or more centrifugal pumps for transferring the mixture from the container to storage or disposal (and/or to mix the mixture within the container to make it homogeneous).
- In certain aspects the mixture contained within a container is a slurry which includes a fluid or fluids and solids in the fluid. In one particular aspect, the mixture is a slurry of drilling fluid from a wellbore with solids (e.g. drilled cuttings, drilled debris, etc.) therein.
- In certain particular aspects, the present invention discloses a centrifugal pump with a packing structure for a pump shaft. The packing structure includes seals that act as containment barriers to prevent outside contamination from entering a pump housing and contacting the shaft and other parts. In certain aspects, the packing structure is sealed within a non-vented space below bearings, a space in which a positive pressure is maintained. Also, with seals isolated and under pressure, and located in a non-vented space, as temperature builds up during operation, lubricant adjacent the seals expands, increasing pressure as compared to pressure external to the packing structure, which contributes to maintaining the seals in isolation and to prohibiting contaminants from entering the system and flowing to the bearings. Thus, the life of parts, e.g. shafts and bearings, can be extended.
- In certain aspects, the present invention discloses pumping systems for pumping a drilling mixture containing liquid drilling fluid and solids (e.g., debris, drilled cuttings, etc.) entrained in the liquid drilling fluid, the pumping systems including: a container for receiving and holding the drilling mixture; centrifugal pump apparatus for transferring the drilling mixture from the container, the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft, a housing, the housing comprising an enclosed non-vented structure; and the packing structure, bearing apparatus and part of the pump shaft within the housing.
- The present invention discloses, in certain aspects, centrifugal pump apparatus including: a pump shaft; a motor to drive the pump shaft; a packing structure around the pump shaft; bearing apparatus for the pump shaft; a non-vented housing able to contain lubricant and/or grease under pressure; and the packing structure, bearing apparatus and part of the pump shaft within the housing.
- In certain aspects, the present invention discloses methods for pumping a mixture containing liquid and solids (in one particular aspect, a mixture of drilling fluid and drilled solids), the method including: feeding the mixture from a container for receiving and holding the mixture to a centrifugal pump apparatus for transferring the mixture from the container, the centrifugal pump apparatus being any according to the present invention; and with the centrifugal pump, pumping the mixture from the container.
- The present invention discloses, in certain aspects, pumping systems for pumping a mixture containing liquid and solids, the pumping systems including: a container for receiving and holding the mixture; centrifugal pump apparatus for transferring the mixture from the container; the centrifugal pump apparatus including a non-vented housing that is able to hold pressure.
- What follows are some of, but not all, the objects of this invention. In addition to the specific objects stated below for at least certain preferred embodiments of the invention, there are other objects and purposes which will be readily apparent to one of skill in this art who has the benefit of this invention's teachings and disclosures. It is, therefore, an object of at least certain preferred embodiments of the present invention to provide:
- New, useful, unique, efficient, non-obvious pumping systems; methods of their use; and centrifugal pump apparatus for use with them;
- Such pumping systems with a pump having an isolated packing structure with a relatively high internal pressure which effectively prevents contaminants from entering the system and flowing to items above the packing structure, e.g. preserving vital parts, e.g. bearings and shafts;
- Such pumping systems and methods in which a packing structure is located in a non-vented space; and
- In certain aspects, such a pump in which lubricant heated during operation increases pressure on the packing structure.
- Certain embodiments of this invention are not limited to any particular individual feature disclosed here, but include combinations of them distinguished from the prior art in their structures, functions, and/or results achieved. Features of the invention have been broadly described so that the detailed descriptions that follow may be better understood, and in order that the contributions of this invention to the arts may be better appreciated. There are, of course, additional aspects of the invention described below and which may be included in the subject matter of the claims to this invention. Those skilled in the art who have the benefit of this invention, its teachings, and suggestions will appreciate that the conceptions of this disclosure may be used as a creative basis for designing other structures, methods and systems for carrying out and practicing the present invention. The claims of this invention are to be read to include any legally equivalent devices or methods which do not depart from the spirit and scope of the present invention.
- The present invention recognizes and addresses the problems and needs in this area and provides a solution to those problems and a satisfactory meeting of those needs in its various possible embodiments and equivalents thereof. To one of skill in this art who has the benefits of this invention's realizations, teachings, disclosures, and suggestions, other purposes and advantages will be appreciated from the following description of certain preferred embodiments, given for the purpose of disclosure, when taken in conjunction with the accompanying drawings. The detail in these descriptions is not intended to thwart this patent's object to claim this invention no matter how others may later attempt to disguise it by variations in form, changes, or additions of further improvements.
- The Abstract that is part hereof is to enable the U.S. Patent and Trademark Office and the public generally, and scientists, engineers, researchers, and practitioners in the art who are not familiar with patent terms or legal terms of phraseology to determine quickly from a cursory inspection or review the nature and general area of the disclosure of this invention. The Abstract is neither intended to define the invention, which is done by the claims, nor is it intended to be limiting of the scope of the invention in any way.
- It will be understood that the various embodiments of the present invention may include one, some, or all of the disclosed, described, and/or enumerated improvements and/or technical advantages and/or elements in claims to this invention.
- A more particular description of embodiments of the invention briefly summarized above may be had by references to the embodiments which are shown in the drawings which form a part of this specification. These drawings illustrate certain preferred embodiments and are not to be used to improperly limit the scope of the invention which may have other equally effective or legally equivalent embodiments.
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FIG. 1 is a perspective view of a pumping system according to the present invention. -
FIG. 2 is a perspective view of the system ofFIG. 1 . -
FIG. 3 is a side schematic side view of part of the system ofFIG. 1 . -
FIG. 4 is a perspective view of a pump according to the present invention of the system ofFIG. 1 . -
FIG. 5 is a front view of the pump ofFIG. 4 . -
FIG. 6 is an underside view of the pumps ofFIG. 4 . -
FIG. 7 is a cutaway view along line 7-7 ofFIG. 5 . -
FIG. 8 is a cross-sectional view of the pump along line 8-8 ofFIG. 6 . -
FIG. 9A is a side view of a pump according to the present invention. -
FIG. 9B is a cross-sectional view alongline 9B-9B of the pump ofFIG. 9A . -
FIG. 9C is an enlarged view of part of the pump ofFIG. 9B . -
FIG. 10A is an exploded perspective view of part of the pump ofFIG. 9A . -
FIG. 10B is an enlarged perspective view of part of the pump ofFIG. 10A . -
FIG. 11 is a cross-section view of a prior art seal useful with the pump ofFIG. 9A . - Presently preferred embodiments of the invention are shown in the above-identified figures and described in detail below. Various aspects and features of embodiments of the invention are described below and some are set out in the dependent claims. Any combination of aspects and/or features described below or shown in the dependent claims can be used except where such aspects and/or features are mutually exclusive. It should be understood that the appended drawings and description herein are of preferred embodiments and are not intended to limit the invention or the appended claims. On the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the invention as defined by the appended claims. In showing and describing the preferred embodiments, like or identical reference numerals are used to identify common or similar elements. The figures are not necessarily to scale and certain features and certain views of the figures may be shown exaggerated in scale or in schematic in the interest of clarity and conciseness.
- As used herein and throughout all the various portions (and headings) of this patent, the terms “invention”, “present invention” and variations thereof mean one or more embodiment, and are not intended to mean the claimed invention of any particular appended claim(s) or all of the appended claims. Accordingly, the subject or topic of each such reference is not automatically or necessarily part of, or required by, any particular claim(s) merely because of such reference. So long as they are not mutually exclusive or contradictory any aspect or feature or combination of aspects or features of any embodiment disclosed herein may be used in any other embodiment disclosed herein.
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FIGS. 1-2 illustrate asystem 10 according to the present invention which has acontainer 8; ahandling system 4; and anauger 6. Any suitable container or tank of any configuration and dimensions may be used. As shown, thecontainer 8 is an elongated tank for receiving and holding a mixture with liquid and solids. In certain particular aspects, thecontainer 8 is designed so that it can be easily transported from location to location; e.g., land locations, on an offshore platform, or to and from other remote locations. - Optionally, the
container 8 has a pair ofrails 18 supported bybraces 20. Thehandling system 4, which moves on therails 18, is mounted on a platform ortrolley 22 which has a set ofwheels 24. Theplatform 22 has a pair ofsprocket wheels 26 which are propelled by a motor and which engage therails 18 to move thehandling system 4 back and forth from one end of thecontainer 8 to the other. - The
handling system 4 includes ashovel 28 for moving material within and from one end to the other end of the container. - The
handling system 4 includes apump system 30 according to the present invention for pumping material from thecontainer 8. Thepump system 30 includes at least one pump according to the present invention. - As shown in
FIG. 2 , thehandling system 4 and theshovel 28 have moved within thecontainer 8, pushing material toward one end of thecontainer 8. Here theauger 6 may be activated to move material from thecontainer 8. -
FIG. 3 shows shovel 28 connected to aboom ladder 40, extending from afirst extension member 42. Theboom ladder 40 and thefirst extension member 42 are pivotally attached by apin 44. Thefirst extension member 42 is attached to theplatform 22. Ashovel blade 48 is attached to asecond extension member 46. An optionaldetachable shovel blade 50 is attached to theboom member 40 via athird extension member 52. - The
pump system 30 includes apump motor 54 which is adapted to apump case cylinder 56. Aguard 58 is, optionally, included so that asuction inlet 60 is raised enough off the bottom so that large solids do not enter the pump or block off thesuction inlet 60. Adisposal conduit 62, leading from thepump case cylinder 56, conducts material to a swiveljoint conduit 64 for ultimate disposal. Optionally, anoscillator 70 oscillates theboom ladder 40. - Referring now to
FIG. 4 , themotor 54 of thepump system 30 is operatively associated with animpeller assembly 200. Thepump motor 54 may be any suitable commercially available motor. The shaft from the motor extends to thepump case cylinder 56, with theimpeller 200 encased within thepump case cylinder 56. Ashaft cover 250 extends from themotor 54 to a top 252 of thepump case cylinder 56. Thecover 250 contains supports and atop flange 254 and abottom flange 256, with thetop flange 254 connected to amotor flange 258. Lines for the motor include aninput line 260 andoutput line 262 for hydraulic power fluid input and output. - The
disposal conduit 62 leads from thepump case cylinder 56. Thepump case cylinder 56 has anextension section 264 that stretches to the generally vertically orienteddisposal conduit 62. Theextension section 264 also extends to aslurry gate 122 with apassage 124.Brackets legs 58.FIG. 5 depicts theimpeller assembly 200 and the protrusion of blade ends from apump case bottom 267. Theslurry gate 122 provides an outlet for the system. - In
FIG. 6 , the underside portion of thepump system 30 is illustrated and theimpeller assembly 200 is shown projecting from the bottom of the pump case. Theextension section 264 extends from the cylindricalpump case cylinder 56. Theslurry gate 122 contains arod 268 that is used to position the gate in an open or closed position. Alternatively, an hydraulic cylinder apparatus is used to move the gate. The pump both mixes the slurry and discharges it. - As shown in
FIG. 7 , aplate 202 is disposed within thepump case cylinder 56. Anouter periphery 270 is placed in relatively close relationship with an innercylindrical wall 272 of thepump case cylinder 56. Material (e.g. mixture; slurry) enters thepump case cylinder 56 from acenter inlet area 208 and is directed through theimpeller assembly 200 and outward towards theinner wall 272 due to the centrifugal force generated by rotation.Arrows 274 depicted the travel area of the slurry about the innercircular wall 272 to theextension section 264 which in turn allows passage to thedisposal conduit 62. Theextension section 264 and thedisposal conduit 62 are in fluid communication with one another. The material is then lifted by thepump system 30 up into and out of theconduit 62. -
FIG. 8 shows thepump system 30 with arotative shaft 276 that extends from themotor 54. Theshaft cover 250 is generally a cylindrical member with an inner bore. The inner bore has disposed therein a first set ofroller bearings 278 and second set ofroller bearings 280 that are separated by aspacer 282. Theshaft 276 is threadedly connected to theimpeller assembly 200 so that, when theshaft 276 is rotated by the motor, theimpeller assembly 200 and associated blades rotate thereby loading thepump case cylinder 56 with the material as previously described. - A generally
circular opening 284 is at the bottom 267 of thecase 56. In one aspect, awear plate 286 is, optionally, added which adds to the structure and reinforces thepump case 56 thereby protecting from the erosional forces produced during pumping. Theslurry gate 124 provides a mixing outlet for the material. - The
pump system 30 includes apacking structure 170 according to the present invention which may be any packing structure according to the present invention disclosed herein. The packingstructure 170 surrounds theshaft 276. -
FIGS. 9A and 9B show apump system 300 according to the present invention which has a drivingshaft 332 driven by amotor 334. The drivingshaft 332 is connected to an impeller assembly (not shown; any suitable impeller, e.g., but not limited to, like theimpeller assembly 200,FIG. 7 ). - The driving
shaft 332 extends through ahousing 336 and has a lower threadedend 338 for connection to an impeller assembly. Themotor 334 is mounted on aplate 342.Flanges 344 are connected to thehousing 336 and abase 346. - A bearing spacer 350 spaces-apart
upper bearings 352 andlower bearings 354 which facilitate rotation of the drivingshaft 332. Lubricant is contained in aspace 356 and encompasses the bearings. This lubricant (e.g. high viscosity lubricant e.g., gear oil) is introduced into thespace 356 through aport 358 which is closed off with a plug 362 (e.g. once the space is devoid of air). Aremovable snap ring 364 holds thebearings spacer 350 in place. Lubricant can flow from theport 358 down to the lowest of thelower bearings 354. Thespace 356 includes thebearings bearings 352 and space above thebearings 354. - A packing
structure 310 according to the present invention surrounds the drivingshaft 332; maintains the bearings in place; and prevents contaminants from entering thespace 356 which could damage or erode parts of the system, e.g. theshaft 332 and/or the bearings. -
FIGS. 9C , 10A and 10B show thepacking structure 310 in detail. According to the present invention, at least one seal can be used and at least one seal retainer ring can be used. As shown inFIG. 9B andFIG. 9C there are a plurality ofseals top floor member 316 and abottom floor member 318. In certain aspects the seals 311-314 are made of hard rubber and steel and the floor members are made of high wear resistant material such as, e.g., 4140 steel. A single floor member may be used. The floor members have cutouts or recesses R for the seals. Thefloor members housing 336. A retainer or “hat” 322 is used between the exterior of theshaft 332 and the seals 311-314. A top end of theretainer 322 abuts ashoulder 332 a of theshaft 332. The retainer has a base 322 b and a cylinder 322 c. The cylinder 322 c encircles part of theshaft 332. Theretainer 322 rotates with theshaft 332. An impeller (e.g. an impeller/assembly as inFIG. 4 ) will abut theretainer 322, locking it in place and sealing the bearing housing. Theretainer 322 acts as a barrier inhibiting or preventing contaminants and debris from contacting the pump shaft. - The upper and lower floors exceed the interior diameter of the bearings and provide housings for the double set of seals that isolate the bearing area. The floor members also act as temporary supports and guides for the
shaft 332, e.g. if a bearing failure occurs. This auxiliary back-up support and guidance function allows for the pump operation to continue until a safe shut down can be made for replacement. - To pressurize the seals 311-314 against the
shaft 332, grease under pressure is introduced through agrease fitting 324 into the space occupied by the seals 311-314 and thefloor members packing structure 310. This positive internal pressure is greater than atmospheric pressure external to the bearing housing and is greater than an increased external pressure, e.g. such an increased pressure caused by suction created by impeller turbulence. It is within the scope of the present invention to use one, two, three, four, five, six or more of the seals 311-314 and/or to use one, two, three or more of thefloor members -
FIG. 11 shows aseal member 360 which has abody 326 with arubber ring 364 in arecess 366. In one aspect, theseal member 360 is used with therubber ring 364 facing upwardly. Theseal 311 prevents bearing lubricant from flowing down into thepacking system 300. Any suitable seal may be used instead of theseal members 360. - The present invention, therefore, provides in at least certain embodiments, a pumping system for pumping a drilling mixture containing liquid drilling fluid and solids entrained in the liquid drilling fluid, the pumping system including: a container for receiving and holding the drilling mixture; centrifugal pump apparatus for transferring the drilling mixture from the container; the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft; a housing, the housing which is an enclosed non-vented structure; and the packing structure, bearing apparatus and part of the pump shaft within the housing. Such a system may have one or some, in any possible combination, of the following: seal apparatus for sealing the housing to prevent the ingress of contaminants into the housing; a lubricant port through the housing for providing lubricant to the bearing apparatus; lubricant within the housing for lubricating the bearing apparatus, the lubricant expandable upon heating to increase pressure within the housing to inhibit contaminants from entering the housing through the pump-shaft/housing interface; the seal apparatus containing at least one seal; the packing structure surrounding the pump shaft and maintaining the bearing apparatus in position adjacent the pump shaft and above the packing structure; the packing structure inhibiting contaminants from flowing to the bearing apparatus; a retainer with a base and a cylinder, the cylinder encircling a portion of the drive shaft and the base abutting a bottom of the packing structure; the retainer acting as a barrier inhibiting contaminants from contacting the pump shaft; seal apparatus for sealing the housing to prevent the ingress of contaminants into the housing, the seal apparatus including at least one seal, and the at least one seal sealingly contacting an exterior surface of the retainer ring's cylinder; the packing structure including at least one seal, and at least one retainer ring for holding the seal in a sealing position; the at least one retainer ring having a ring diameter, the bearing apparatus having a bearing diameter, and the ring diameter greater than the bearing diameter; impeller apparatus on the pump shaft, the impeller apparatus abutting the retainer; the retainer supporting and guiding the pump shaft in the event of failure of the bearing apparatus; a grease port for introducing grease into the housing for the at least one seal of the seal apparatus; and/or grease adjacent the at least one seal, the grease under pressure to provide a positive internal pressure at a location of the packing structure.
- The present invention, therefore, provides in at least certain embodiments, a pumping system for pumping a drilling mixture containing liquid drilling fluid and solids entrained in the liquid drilling fluid, the pumping system including: a container for receiving and holding the drilling mixture; centrifugal pump apparatus for transferring the drilling mixture from the container; the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft; a housing which is an enclosed non-vented structure; the packing structure, bearing apparatus and part of the pump shaft within the housing; seal apparatus for sealing the housing to prevent the ingress of contaminants into the housing; the packing structure surrounding the pump shaft and maintaining the bearing apparatus in position adjacent the pump shaft and above the packing structure; the packing structure inhibiting contaminants from flowing to the bearing apparatus; a retainer with a base and a cylinder, the cylinder encircling a portion of the drive shaft and the base abutting a bottom of the packing structure; and the retainer acting as a barrier inhibiting contaminants from contacting the pump shaft.
- The present invention, therefore, provides in at least certain embodiments, a centrifugal pump apparatus including: a pump shaft; a motor to drive the pump shaft; a packing structure around the pump shaft; bearing apparatus around the pump shaft; a housing which is a non-vented housing; and the packing structure, bearing apparatus and part of the pump shaft within the housing.
- The present invention, therefore, provides in at least certain embodiments, a method for pumping a mixture containing liquid and solids, the method including: feeding the mixture from a container for receiving and holding the mixture to a centrifugal pump apparatus for transferring the mixture from the container, the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a housing, a packing structure around the pump shaft and bearing apparatus around the pump shaft, the housing comprising a non-vented housing, the packing structure, bearing apparatus and part of the pump shaft within the housing; and, with the centrifugal pump, pumping the mixture from the container.
- The present invention, therefore, provides in at least certain embodiments, a pumping system for pumping a mixture containing liquid and solids, the pumping system including: a container for receiving and holding the mixture; centrifugal pump apparatus for transferring the mixture from the container; the centrifugal pump apparatus including housing, a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft, the housing being a non-vented enclosure; and the packing structure, bearing apparatus and part of the pump shaft within the housing.
- In conclusion, therefore, it is seen that the present invention and the embodiments disclosed herein and those covered by the appended claims are well adapted to carry out the objectives and obtain the ends set forth. Certain changes can be made in the subject matter without departing from the spirit and the scope of this invention. It is realized that changes are possible within the scope of this invention and it is further intended that each element or step recited in any of the following claims is to be understood as referring to the step literally and/or to all equivalent elements or steps. The following claims are intended to cover the invention as broadly as legally possible in whatever form it may be utilized. The invention claimed herein is new and novel in accordance with 35 U.S.C. § 102 and satisfies the conditions for patentability in § 102. The invention claimed herein is not obvious in accordance with 35 U.S.C. § 103 and satisfies the conditions for patentability in § 103. This specification and the claims that follow are in accordance with all of the requirements of 35 U.S.C. § 112. The inventors may rely on the Doctrine of Equivalents to determine and assess the scope of their invention and of the claims that follow as they may pertain to apparatus not materially departing from, but outside of, the literal scope of the invention as set forth in the following claims. All patents and applications identified herein are incorporated fully herein for all purposes. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures. Thus, although a nail and a screw may not be structural equivalents in that a nail employs a cylindrical surface to secure wooden parts together, whereas a screw employs a helical surface, in the environment of fastening wooden parts, a nail and a screw may be equivalent structures. It is the express intention of the applicant not to invoke 35 U.S.C. § 112,
paragraph 6 for any limitations of any of the claims herein, except for those in which the claim expressly uses the words ‘means for’ together with an associated function.
Claims (20)
1. A pumping system for pumping a drilling mixture containing liquid drilling fluid and solids entrained in the liquid drilling fluid, the pumping system comprising
a container for receiving and holding the drilling mixture,
centrifugal pump apparatus for transferring the drilling mixture from the container,
the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft,
a housing, the housing comprising an enclosed non-vented structure, and
the packing structure, bearing apparatus and part of the pump shaft within the housing.
2. The pumping system of claim 1 further comprising
seal apparatus for sealing the housing to prevent the ingress of contaminants into the housing.
3. The pumping system of claim 1 further comprising
a lubricant port through the housing for providing lubricant to the bearing apparatus.
4. The pumping system of claim 3 further comprising
lubricant within the housing for lubricating the bearing apparatus, the lubricant expandable upon heating to increase pressure within the housing to inhibit contaminants from entering the housing through the pump-shaft/housing interface.
5. The pumping system of claim 2 wherein the seal apparatus contains at least one seal.
6. The pumping system of claim 1 wherein
the packing structure surrounds the pump shaft and maintains the bearing apparatus in position adjacent the pump shaft and above the packing structure.
7. The pumping system of claim 6 wherein
the packing structure inhibits contaminants from flowing to the bearing apparatus.
8. The pumping system of claim 6 further comprising
a retainer with a base and a cylinder, the cylinder encircling a portion of the drive shaft and the base abutting a bottom of the packing structure.
9. The pumping system of claim 8 wherein
the retainer acts as a barrier inhibiting contaminants from contacting the pump shaft.
10. The pumping system of claim 8 further comprising
seal apparatus for sealing the housing to prevent the ingress of contaminants into the housing, the seal apparatus including at least one seal, and
the at least one seal sealingly contacting an exterior surface of the retainer ring's cylinder.
11. The pumping system of claim 6 wherein
the packing structure comprises
at least one seal, and
at least one retainer ring for holding the seal in a sealing position.
12. The pumping system of claim 11 wherein
the at least one retainer ring has a ring diameter,
the bearing apparatus has a bearing diameter, and
the ring diameter is greater than the bearing diameter.
13. The pumping system of claim 8 further comprising
impeller apparatus on the pump shaft,
the impeller apparatus abutting the retainer.
14. The pumping system of claim 8 wherein
the retainer supports and guides the pump shaft in the event of failure of the bearing apparatus.
15. The pumping system of claim 11 further comprising
a grease port for introducing grease into the housing for the at least one seal of the seal apparatus.
16. The pumping system of claim 12 further comprising
grease adjacent the at least one seal, the grease under pressure to provide a positive internal pressure at a location of the packing structure.
17. A pumping system for pumping a drilling mixture containing liquid drilling fluid and solids entrained in the liquid drilling fluid, the pumping system comprising
a container for receiving and holding the drilling mixture,
centrifugal pump apparatus for transferring the drilling mixture from the container,
the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft,
a housing, the housing comprising an enclosed non-vented structure,
the packing structure, bearing apparatus and part of the pump shaft within the housing,
seal apparatus for sealing the housing to prevent the ingress of contaminants into the housing,
the packing structure surrounds the pump shaft and maintains the bearing apparatus in position adjacent the pump shaft and above the packing structure,
the packing structure inhibits contaminants from flowing to the bearing apparatus,
a retainer with a base and a cylinder, the cylinder encircling a portion of the drive shaft and the base abutting a bottom of the packing structure, and
the retainer acts as a barrier inhibiting contaminants from contacting the pump shaft.
18. A centrifugal pump apparatus comprising
a pump shaft,
a motor to drive the pump shaft,
a packing structure around the pump shaft,
bearing apparatus around the pump shaft,
a housing comprising a non-vented housing, and
the packing structure, bearing apparatus and part of the pump shaft within the housing.
19. A method for pumping a mixture containing liquid and solids, the method comprising
feeding the mixture from a container for receiving and holding the mixture to a centrifugal pump apparatus for transferring the mixture from the container, the centrifugal pump apparatus including a pump shaft, a motor to drive the pump shaft, a housing, a packing structure around the pump shaft and bearing apparatus around the pump shaft, the housing comprising a non-vented housing, the packing structure, bearing apparatus and part of the pump shaft within the housing, and
with the centrifugal pump, pumping the mixture from the container.
20. A pumping system for pumping a mixture containing liquid and solids, the pumping system comprising
a container for receiving and holding the mixture, centrifugal pump apparatus for transferring the mixture from the container,
the centrifugal pump apparatus including housing, a pump shaft, a motor to drive the pump shaft, a packing structure around the pump shaft and bearing apparatus around the pump shaft, the housing comprising a non-vented enclosure, and
the packing structure, bearing apparatus and part of the pump shaft within the housing.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/977,424 US20090110574A1 (en) | 2007-10-24 | 2007-10-24 | Centrifugal pump systems |
CA2704733A CA2704733A1 (en) | 2007-10-24 | 2008-09-25 | Mud pit and pump apparatus therefor |
PCT/GB2008/050863 WO2009053729A1 (en) | 2007-10-24 | 2008-09-25 | Mud pit and pump apparatus therefor |
GB1005131A GB2465325A (en) | 2007-10-24 | 2008-09-25 | Mud pit and pump apparatus therefor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/977,424 US20090110574A1 (en) | 2007-10-24 | 2007-10-24 | Centrifugal pump systems |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090110574A1 true US20090110574A1 (en) | 2009-04-30 |
Family
ID=40260762
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/977,424 Abandoned US20090110574A1 (en) | 2007-10-24 | 2007-10-24 | Centrifugal pump systems |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090110574A1 (en) |
CA (1) | CA2704733A1 (en) |
GB (1) | GB2465325A (en) |
WO (1) | WO2009053729A1 (en) |
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NO123115B (en) * | 1967-10-18 | 1971-09-27 | Patents & Dev As |
-
2007
- 2007-10-24 US US11/977,424 patent/US20090110574A1/en not_active Abandoned
-
2008
- 2008-09-25 GB GB1005131A patent/GB2465325A/en not_active Withdrawn
- 2008-09-25 CA CA2704733A patent/CA2704733A1/en not_active Abandoned
- 2008-09-25 WO PCT/GB2008/050863 patent/WO2009053729A1/en active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
CA2704733A1 (en) | 2009-04-30 |
GB2465325A (en) | 2010-05-19 |
WO2009053729A1 (en) | 2009-04-30 |
GB201005131D0 (en) | 2010-05-12 |
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Legal Events
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AS | Assignment |
Owner name: VARCO I/P, TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LOVE, WILLIAM WRAY;ANGELLE, CLINTON JAMES;REEL/FRAME:020057/0301 Effective date: 20071019 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |