US3268159A - Centrifuge - Google Patents

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US3268159A
US3268159A US315477A US31547763A US3268159A US 3268159 A US3268159 A US 3268159A US 315477 A US315477 A US 315477A US 31547763 A US31547763 A US 31547763A US 3268159 A US3268159 A US 3268159A
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drum
centrifuge
solids
liquid
rotation
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US315477A
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Kern Robert
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JM Voith GmbH
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JM Voith GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2083—Configuration of liquid outlets

Definitions

  • a centrifuge of this kind has a rotationally symmetrical body on the outer surface of which is mounted a helically elongated or screw flange for moving the solids in axial direction during rotation of the body.
  • a rotatable drum Around the outside of the body and mounted for rotation coaxially therewith is a rotatable drum, spaced from the outer surface of the body to permit rotation of the body and its screw flange inside the rotating drum so as to move the solids axially in one direction.
  • the mud is introduced at one end of the apparatus into the space between the body and the drum and is then put into rapid rotation in that cylindrical space.
  • the specifically heavier solids will be separated from the liquid by centrifugal force and will be deposited on the inner surface of the drum.
  • the liquid which, in the prior devices of this kind, enters the rotating body through its radial openings is under centrifugal force which opposes such entrance.
  • the liquid will therefore enter the body with reduced velocity, which will result in separation of residual solids from the liquid, and these will be deposited in the radial openings of the body so as to reduce the throughput through the machine.
  • the conduits for removing the separated liquid reach at least part Way into the rotating body.
  • These pipe-like conduits generally extend partly through the rotating body and partly through the rotating drum, the entrance of the conduits being at the same radial distance from the axis of rotation of the body and drum as the centrifuged liquid, whereas the exit of the conduits is equidistant from or nearer to the axis of rotation. It is generally best to have the radial distances of the conduits from the axis of In some cases, especially where the space that contains the screw flange is of large radial extension, it may be advantageous to pass the conduits that lead to this space directly through the end wall of the drum, so as to avoid the necessity of passing these conduits through any part of the rotating body.
  • the pipe-like conduits are positioned substantially parallel to the axis of rotation, to simplify the manufacture thereof.
  • the conduits for conducting away such liquids are arranged at different distances from the axis of rotation with provision for collecting and discharging these fractions separately.
  • FIGURE 1 is a longitudinal section of a partly conical centrifuge
  • FIGURE 2 is a longitudinal section of a portion of a conical centrifuge with its discharge conduits partly in the rotating body and partly in the rotating drum;
  • FIGURE 3 is a longitudinal section of a portion of a partly conical centrifuge with two liquid discharge passageways.
  • the centrifuge has rotatably mounted on its housing 1 a partly conical drum 2 formed as an assembly of three major parts, and a partly conical body 3a .with a helically extended flange 3 rotatably mounted in the drum.
  • the body 3a which with its flange 3 and the drum 2 are mechanically driven from the narrow end of the centrifuge by a motor or other mechanism for rotation at high but somewhat different speeds in the same direction.
  • the mud is delivered to the annular space 7 between the drum and the body by means of a supply conduit consisting essentially of a stationary pipe 4 extending into and forming a liquid tight joint with the hollow open end of the drum 2 that is opposite its narrower driven end, the conduit terminating in radial canals 6 with adjacent pump blades 5.
  • the mud which is delivered to the annular space 7 forms a ring 8 under the influence of the centrifugal force of the rotating drum 2, in which the heavier solids 9 (indicated by the broken arrows) and the lighter liquid 10 (indicated by the solid arrows) are separated from each other.
  • the solids 9 are discharged through openings 11 in the conical portion of the drum 2 by means of the spiral flange 3, while the liquid 10 passes through a plurality of pipes 12 in the body 3a equally spaced and parallel to its axis of rotation, and then through boreholes 13 in the end wall of the outer drum 2 for discharge into the housing 1.
  • the mud is delivered to the annular space 7 and the solids then discharged through openings near the other end of the drum in the same manner as in FIGURE 1.
  • the discharge of the liquid however occurs in a different manner than in FIG- URE l.
  • the liquid 10 is here delivered from the annular space 7 through pipes 12a in the end wall of the drum 2 to the discharge apparatus 13 which is common to all the pipes.
  • This discharge apparatus consists of a narrow circular chamber 13a provided with entrainment ribs 14 and a number of equally spaced radial collecting pipes 15 which continually remove thin layers of the liquid 10 which is delivered by the pipes 12a to the chamber 13a.
  • the pipes 15 empty into a stationary discharge conduit 16 passing through the hollow hub of the drum 2 for delivering the liquid to the outside.
  • an additional series of pipes 12b closer to the axis of rotation than the pipes 12a, and associated therewith an additional discharge apparatus 13b positioned in the body 3a can be provided as shown in FIGURE 2, whereby liquid samples of different degrees of purity can be removed simultaneously.
  • FIGURE 3 With the construction shown in FIGURE 3, two separate liquid discharge systems 13 together with their respective series of pipes 1212 are arranged in the rotating body 3a for removing liquid portions of different degrees of purity.
  • the construction shown in FIGURE 3 can also include in it the liquid removal system shown in FIG- URE 2 where the liquid is passed directly from the annular space 7 through pipes 12a and into a circular chamber 13a in the end wall of the drum.
  • the pipes or passageways 12, 12a, 12b in the rotary body 3a are parallel to the axis of rotation and symmetrically distributed around said axis. The greatest possible degree of symmetry is maintained in the design of all the parts to ensure smoothness of operation. In each case these pipes or passageways are sufficiently narrow and restricted in cross-section to give the liquid that passes through them a velocity high enough to prevent therein any deposition of solids from the separated liquid.
  • a centrifuge for the separation of dispersed solids from a mud comprising a continuous rotatable body carrying on its radially outer surface a helically elongated screw flange, a rotatable drum surrounding the body and mounted for rotation relative to the body, one end of the drum being provided with an end-wall carrying a central hollow shaft for rotatably supporting the drum the end-Wall having conduit means for conducting the mud into the annular space between the body and the drum, the outer periphery of said flange substantially fitting the adjacent wall of said drum, the opposite end of the drum being of reduced diameter and having openings in it for the discharge of solids which have been moved by the screw flange to that end of the drum, and passageway means in said body extending lengthwise of the axis of rotation thereof opening at one end into said annular space and extending through an end portion of said body for conducting the separated liquid away from said annular space, said passageway means being of restricted cross-section to prevent the deposition therein of solid
  • said passageway means includes a chamber in said rotatable body and a stationary collecting pipe positioned in the chamber for the removal of liquid from the chamber.

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  • Centrifugal Separators (AREA)

Description

Aug. 23, 1966 R. KERN 3,268,159
CENTRIFUGE Filed Oct. 11, 1963 Fig] 73 7 72 2 3 70 8 3a 77 INVENTOR.
ROBERT KERN Y ILM . P I, i O r 3,268,159 Patented August 23, 1966 ,1 {Jails/i011 less than the outside diameter of the rotating CENTRIFUGE Robert Kern, Heidenheim, Germany, assignor to J. M. Voith G.m.b.H., Heidenheim (Brenz), Germany Filed Oct. 11, 1963, Ser. No. 315,477 Claims priority, application Austria, Oct. 16, 1962, 8,153/62 4 Claims. (Cl. 233-7) This invention relates to a centrifuge for the separation of solids from the liquid component of a mud. A centrifuge of this kind has a rotationally symmetrical body on the outer surface of which is mounted a helically elongated or screw flange for moving the solids in axial direction during rotation of the body. Around the outside of the body and mounted for rotation coaxially therewith is a rotatable drum, spaced from the outer surface of the body to permit rotation of the body and its screw flange inside the rotating drum so as to move the solids axially in one direction. The mud is introduced at one end of the apparatus into the space between the body and the drum and is then put into rapid rotation in that cylindrical space. The specifically heavier solids will be separated from the liquid by centrifugal force and will be deposited on the inner surface of the drum. Slow rotation of the spiral flange relative to the drum will then gradually move the deposited layer of solids toward the other end of the drum from which they will be discharged through openings in the drum. At the same time the centrifuged liquid enters the interior of the rotating body through radial openings between the convolutions of the screw flange and flows axially in a direction opposite to the direction of movement of the mud until it reaches the front end of the rotating body from where it escapes to the outside through openings in the same end wall of the drum through which the mud enters.
The liquid which, in the prior devices of this kind, enters the rotating body through its radial openings is under centrifugal force which opposes such entrance. The liquid will therefore enter the body with reduced velocity, which will result in separation of residual solids from the liquid, and these will be deposited in the radial openings of the body so as to reduce the throughput through the machine.
Furthermore, since the flow of liquid along the interior of the hollow body is slower than its speed of entrance through the radial openings, there will also be further sedimentation inside the hollow body which may eventually result in complete occlusion of the radial open ings so as to render the centrifuge inoperative.
Furthermore, in centrifuges of this type, the separated liquid, during-its passage across the transitional space between the end wall of the rotating body and the end wall of the drum, will become contaminated with solids from the entering mud which must also pass across this transitional space.
These difliculties of the prior centrifuges of this kind are avoided by the present invention where the liquid which has entered the rotating body through its radial openings is conducted through a plurality of narrow conduits to the other end of the body so that its velocity of flow in the axial direction will not be diminished to such an extent as to result in further deposition of solids.
The conduits for removing the separated liquid reach at least part Way into the rotating body. These pipe-like conduits generally extend partly through the rotating body and partly through the rotating drum, the entrance of the conduits being at the same radial distance from the axis of rotation of the body and drum as the centrifuged liquid, whereas the exit of the conduits is equidistant from or nearer to the axis of rotation. It is generally best to have the radial distances of the conduits from the axis of In some cases, especially where the space that contains the screw flange is of large radial extension, it may be advantageous to pass the conduits that lead to this space directly through the end wall of the drum, so as to avoid the necessity of passing these conduits through any part of the rotating body.
In another form of this invention, the pipe-like conduits are positioned substantially parallel to the axis of rotation, to simplify the manufacture thereof.
In order to obtain separated liquid iinactions of different degrees of purity, the conduits for conducting away such liquids are arranged at different distances from the axis of rotation with provision for collecting and discharging these fractions separately.
In the drawing which shows, in schematic arrangements, three embodiments of the centrifuge of this invention FIGURE 1 is a longitudinal section of a partly conical centrifuge;
FIGURE 2 is a longitudinal section of a portion of a conical centrifuge with its discharge conduits partly in the rotating body and partly in the rotating drum;
FIGURE 3 is a longitudinal section of a portion of a partly conical centrifuge with two liquid discharge passageways.
In these three figures, equivalent parts are designated by the same reference characters.
In FIGURE 1 the centrifuge has rotatably mounted on its housing 1 a partly conical drum 2 formed as an assembly of three major parts, and a partly conical body 3a .with a helically extended flange 3 rotatably mounted in the drum. The body 3a which with its flange 3 and the drum 2 are mechanically driven from the narrow end of the centrifuge by a motor or other mechanism for rotation at high but somewhat different speeds in the same direction. The mud is delivered to the annular space 7 between the drum and the body by means of a supply conduit consisting essentially of a stationary pipe 4 extending into and forming a liquid tight joint with the hollow open end of the drum 2 that is opposite its narrower driven end, the conduit terminating in radial canals 6 with adjacent pump blades 5. The mud which is delivered to the annular space 7 forms a ring 8 under the influence of the centrifugal force of the rotating drum 2, in which the heavier solids 9 (indicated by the broken arrows) and the lighter liquid 10 (indicated by the solid arrows) are separated from each other. The solids 9 are discharged through openings 11 in the conical portion of the drum 2 by means of the spiral flange 3, while the liquid 10 passes through a plurality of pipes 12 in the body 3a equally spaced and parallel to its axis of rotation, and then through boreholes 13 in the end wall of the outer drum 2 for discharge into the housing 1.
In the centrifuge of FIGURE 2, the mud is delivered to the annular space 7 and the solids then discharged through openings near the other end of the drum in the same manner as in FIGURE 1. The discharge of the liquid however occurs in a different manner than in FIG- URE l. The liquid 10 is here delivered from the annular space 7 through pipes 12a in the end wall of the drum 2 to the discharge apparatus 13 which is common to all the pipes. This discharge apparatus consists of a narrow circular chamber 13a provided with entrainment ribs 14 and a number of equally spaced radial collecting pipes 15 which continually remove thin layers of the liquid 10 which is delivered by the pipes 12a to the chamber 13a. The pipes 15 empty into a stationary discharge conduit 16 passing through the hollow hub of the drum 2 for delivering the liquid to the outside.
In certain cases where the radial dimensions are ade- 9 a quate, an additional series of pipes 12b closer to the axis of rotation than the pipes 12a, and associated therewith an additional discharge apparatus 13b positioned in the body 3a, can be provided as shown in FIGURE 2, whereby liquid samples of different degrees of purity can be removed simultaneously. By locating the discharge apparatus 13b in the rotating body 3a, the necessity for bore holes 12a through the end wall of the drum 2 is avoided.
With the construction shown in FIGURE 3, two separate liquid discharge systems 13 together with their respective series of pipes 1212 are arranged in the rotating body 3a for removing liquid portions of different degrees of purity. The construction shown in FIGURE 3 can also include in it the liquid removal system shown in FIG- URE 2 where the liquid is passed directly from the annular space 7 through pipes 12a and into a circular chamber 13a in the end wall of the drum.
In each of the three constructions shown in the drawings, the pipes or passageways 12, 12a, 12b in the rotary body 3a are parallel to the axis of rotation and symmetrically distributed around said axis. The greatest possible degree of symmetry is maintained in the design of all the parts to ensure smoothness of operation. In each case these pipes or passageways are sufficiently narrow and restricted in cross-section to give the liquid that passes through them a velocity high enough to prevent therein any deposition of solids from the separated liquid.
Although various forms of this invention have been shown with considerable precision, it is to be understood that the invention is not restricted to the specific details of construction that have been shown and described, unless such details are recited in the claims.
What is claimed is:
1. A centrifuge for the separation of dispersed solids from a mud, said centrifuge comprising a continuous rotatable body carrying on its radially outer surface a helically elongated screw flange, a rotatable drum surrounding the body and mounted for rotation relative to the body, one end of the drum being provided with an end-wall carrying a central hollow shaft for rotatably supporting the drum the end-Wall having conduit means for conducting the mud into the annular space between the body and the drum, the outer periphery of said flange substantially fitting the adjacent wall of said drum, the opposite end of the drum being of reduced diameter and having openings in it for the discharge of solids which have been moved by the screw flange to that end of the drum, and passageway means in said body extending lengthwise of the axis of rotation thereof opening at one end into said annular space and extending through an end portion of said body for conducting the separated liquid away from said annular space, said passageway means being of restricted cross-section to prevent the deposition therein of solids from the separated liquid.
2. The centrifuge of claim 1, in which the restricted passageway means extend parallel to the axis of rotation of the body.
3. The centrifuge of claim 1, in which the restricted passageway means are arranged in separate groups of passageways at different distances from the axis of rotation and discharging their liquids separately, the individual passageways of each group being at the same distance from the axis of rotation.
4. The centrifuge of claim 1, in which said passageway means includes a chamber in said rotatable body and a stationary collecting pipe positioned in the chamber for the removal of liquid from the chamber.
References Cited by the Examiner UNITED STATES PATENTS 1,780,655 11/1930 Nyrop 233-7 1,806,241 5/1931 Dupuis 2337 2,614,748 10/1952 Ritsch 2337 2,711,854 6/1955 Kjellgren 2337 M. CARY NELSON, Primary Examiner.
HENRY T. KLINKSIEK, Examiner.

Claims (1)

1. A CENTRIFUGE FOR THE SEPARATION OF DISPERSED SOLIDS FROM A MUD, SAID CENTRIFUGE COMPRISING A CONTINUOUS ROTATABLE BODY CARRYING ON ITS RADIALLY OUTER SURFACE A HELICALLY ELONGATED SCREW FLANGE, A ROTATABLE DRUM SURROUNDING THE BODY AND MOUNTED FOR ROTATION RELATIVE TO THE BODY, ONE END OF THE DRUM BEING PROVIDED WITH AN END-WALL CARRYING A CENTRAL HOLLOW SHAFT FOR ROTATABLY SUPPORTING THE DRUM THE END-WALL HAVING CONDUIT MEANS FOR CONDUCTING THE MUD INTO THE ANNULAR SPACE BETWEEN THE BODY AND THE DRUM, THE OUTER PERIPHERY OF SAID FLANGE SUBSTANTIALLY FITTING THE ADJACENT WALL OF SAID DRUM, THE OPPOSITE END OF THE DRUM BEING OF REDUCED DIAMETER AND HAVING OPENINGS IN IT FOR THE DISCHARGE OF SOLIDS WHICH HAVE BEEN MOVED BY THE SCREW FLANGE TO THAT END OF THE DRUM, AND PASSAGEWAY MEANS IN SAID BODY EXTENDING LENGHTWISE OF THE AXIS OF ROTATION THEREOF OPENING AT ONE END INTO SAID ANNULAR SPACE AND EXTENDING THROUGH AN END PORTION OF SAID BODY FOR CONDUCTING THE SEPARATED LIQUID AWAY FROM SAID ANNULAR SPACE, SAID PASSAGEWAY MEANS BEING OF RESTRICTED CROSS-SECTION TO PREVENT THE DEPOSITION THEREIN OF SOLIDS FROM THE SEPARATED LIQUID.
US315477A 1962-10-16 1963-10-11 Centrifuge Expired - Lifetime US3268159A (en)

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AT815362A AT246057B (en) 1962-10-16 1962-10-16 Screw centrifuge

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3419210A (en) * 1965-08-09 1968-12-31 Beteiligungs & Patentverw Gmbh Full-envelope centrifuge with discharge screw
US3623656A (en) * 1970-01-30 1971-11-30 Pennwalt Corp Three-phase centrifuge
US3782623A (en) * 1970-06-11 1974-01-01 Krueger As I Decanting centrifuge for draining off water from sewage sludge
US3784091A (en) * 1971-11-03 1974-01-08 G Hiller Centrifugal separator
US3955756A (en) * 1971-06-21 1976-05-11 Flottweg-Werk, Dr. Georg Bruckmayer Gmbh & Co. Kg Solid-shell screw-conveyor centrifuge
US4743226A (en) * 1983-04-29 1988-05-10 Geosource Inc. High capacity continuous solid bowl centrifuge
US20020132718A1 (en) * 2000-08-31 2002-09-19 Koch Richard James Centrifuge for separating fluid components
US20030096691A1 (en) * 2000-08-31 2003-05-22 Koch Richard James Centrifuge systems and methods
US6605029B1 (en) 2000-08-31 2003-08-12 Tuboscope I/P, Inc. Centrifuge with open conveyor and methods of use
US20030228966A1 (en) * 2000-08-31 2003-12-11 Koch Richard James Centrifuge systems and methods
US20060105896A1 (en) * 2004-04-29 2006-05-18 Smith George E Controlled centrifuge systems
US20070084639A1 (en) * 2005-10-18 2007-04-19 Scott Eric L Drilling fluid centrifuge systems
US20070087927A1 (en) * 2005-10-18 2007-04-19 Scott Eric L Centrifuge systems for treating drilling fluids
EP2130607A1 (en) * 2008-06-06 2009-12-09 Mantovani & Vicentini S.r.L. Centrifugal separator
US8172740B2 (en) 2002-11-06 2012-05-08 National Oilwell Varco L.P. Controlled centrifuge systems
US8312995B2 (en) 2002-11-06 2012-11-20 National Oilwell Varco, L.P. Magnetic vibratory screen clamping
US8316557B2 (en) 2006-10-04 2012-11-27 Varco I/P, Inc. Reclamation of components of wellbore cuttings material
US8556083B2 (en) 2008-10-10 2013-10-15 National Oilwell Varco L.P. Shale shakers with selective series/parallel flow path conversion
US8561805B2 (en) 2002-11-06 2013-10-22 National Oilwell Varco, L.P. Automatic vibratory separator
US8622220B2 (en) 2007-08-31 2014-01-07 Varco I/P Vibratory separators and screens
US9073104B2 (en) 2008-08-14 2015-07-07 National Oilwell Varco, L.P. Drill cuttings treatment systems
US9079222B2 (en) 2008-10-10 2015-07-14 National Oilwell Varco, L.P. Shale shaker
US9643111B2 (en) 2013-03-08 2017-05-09 National Oilwell Varco, L.P. Vector maximizing screen

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DE2813140A1 (en) * 1978-03-25 1979-10-25 Kloeckner Humboldt Deutz Ag FULL CASE SCREW CENTRIFUGE
DE3626314C2 (en) * 1986-08-02 1993-11-11 Krauss Maffei Ag Device for separating suspensions
DE4005755A1 (en) * 1989-10-17 1991-04-18 Kloeckner Humboldt Deutz Ag FULL-COVERED SNAIL CENTRIFUGE
US5261869A (en) * 1992-04-06 1993-11-16 Alfa Laval Separation, Inc. Decanter centrifuge having discontinuous flights in the beach area
DE4403912A1 (en) * 1994-02-08 1995-08-10 Flottweg Gmbh Unidirectional decanter assembly solid-liquid mixture introduced through central tube
DE29517390U1 (en) 1995-11-03 1996-01-04 Roehm Gmbh Device for transparent thermal insulation
US5800332A (en) * 1996-07-03 1998-09-01 Hensley; Gary L. Decanting centrifuge employing elements with differing rates of rotation
DE19901655A1 (en) * 1999-01-18 2000-07-20 Baker Hughes De Gmbh Centrifuge for wet mechanical separation of solid mixtures

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US1780655A (en) * 1928-11-02 1930-11-04 Nyrop Aage Sludge separator
US1806241A (en) * 1929-03-09 1931-05-19 Dupuis Fernand Centrifugal separator
US2614748A (en) * 1947-07-29 1952-10-21 Howard P Ritsch Centrifuge for separating solids
US2711854A (en) * 1952-05-14 1955-06-28 Aktiebolag Separator Centrifuge for separating sludge from liquids

Patent Citations (4)

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US1780655A (en) * 1928-11-02 1930-11-04 Nyrop Aage Sludge separator
US1806241A (en) * 1929-03-09 1931-05-19 Dupuis Fernand Centrifugal separator
US2614748A (en) * 1947-07-29 1952-10-21 Howard P Ritsch Centrifuge for separating solids
US2711854A (en) * 1952-05-14 1955-06-28 Aktiebolag Separator Centrifuge for separating sludge from liquids

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3419210A (en) * 1965-08-09 1968-12-31 Beteiligungs & Patentverw Gmbh Full-envelope centrifuge with discharge screw
US3623656A (en) * 1970-01-30 1971-11-30 Pennwalt Corp Three-phase centrifuge
US3782623A (en) * 1970-06-11 1974-01-01 Krueger As I Decanting centrifuge for draining off water from sewage sludge
US3955756A (en) * 1971-06-21 1976-05-11 Flottweg-Werk, Dr. Georg Bruckmayer Gmbh & Co. Kg Solid-shell screw-conveyor centrifuge
US3784091A (en) * 1971-11-03 1974-01-08 G Hiller Centrifugal separator
US4743226A (en) * 1983-04-29 1988-05-10 Geosource Inc. High capacity continuous solid bowl centrifuge
US20020132718A1 (en) * 2000-08-31 2002-09-19 Koch Richard James Centrifuge for separating fluid components
US20030096691A1 (en) * 2000-08-31 2003-05-22 Koch Richard James Centrifuge systems and methods
US6605029B1 (en) 2000-08-31 2003-08-12 Tuboscope I/P, Inc. Centrifuge with open conveyor and methods of use
US20030228966A1 (en) * 2000-08-31 2003-12-11 Koch Richard James Centrifuge systems and methods
US6780147B2 (en) 2000-08-31 2004-08-24 Varco I/P, Inc. Centrifuge with open conveyor having an accelerating impeller and flow enhancer
US6790169B2 (en) 2000-08-31 2004-09-14 Varco I/P, Inc. Centrifuge with feed tube adapter
US7018326B2 (en) 2000-08-31 2006-03-28 Varco I/P, Inc. Centrifuge with impellers and beach feed
US8561805B2 (en) 2002-11-06 2013-10-22 National Oilwell Varco, L.P. Automatic vibratory separator
US8695805B2 (en) 2002-11-06 2014-04-15 National Oilwell Varco, L.P. Magnetic vibratory screen clamping
US8172740B2 (en) 2002-11-06 2012-05-08 National Oilwell Varco L.P. Controlled centrifuge systems
US8312995B2 (en) 2002-11-06 2012-11-20 National Oilwell Varco, L.P. Magnetic vibratory screen clamping
US20060105896A1 (en) * 2004-04-29 2006-05-18 Smith George E Controlled centrifuge systems
US20070084639A1 (en) * 2005-10-18 2007-04-19 Scott Eric L Drilling fluid centrifuge systems
US20070087927A1 (en) * 2005-10-18 2007-04-19 Scott Eric L Centrifuge systems for treating drilling fluids
US7540837B2 (en) 2005-10-18 2009-06-02 Varco I/P, Inc. Systems for centrifuge control in response to viscosity and density parameters of drilling fluids
US7540838B2 (en) 2005-10-18 2009-06-02 Varco I/P, Inc. Centrifuge control in response to viscosity and density parameters of drilling fluid
US8533974B2 (en) 2006-10-04 2013-09-17 Varco I/P, Inc. Reclamation of components of wellbore cuttings material
US8316557B2 (en) 2006-10-04 2012-11-27 Varco I/P, Inc. Reclamation of components of wellbore cuttings material
US8622220B2 (en) 2007-08-31 2014-01-07 Varco I/P Vibratory separators and screens
EP2130607A1 (en) * 2008-06-06 2009-12-09 Mantovani & Vicentini S.r.L. Centrifugal separator
US9073104B2 (en) 2008-08-14 2015-07-07 National Oilwell Varco, L.P. Drill cuttings treatment systems
US8556083B2 (en) 2008-10-10 2013-10-15 National Oilwell Varco L.P. Shale shakers with selective series/parallel flow path conversion
US9079222B2 (en) 2008-10-10 2015-07-14 National Oilwell Varco, L.P. Shale shaker
US9677353B2 (en) 2008-10-10 2017-06-13 National Oilwell Varco, L.P. Shale shakers with selective series/parallel flow path conversion
US9643111B2 (en) 2013-03-08 2017-05-09 National Oilwell Varco, L.P. Vector maximizing screen
US10556196B2 (en) 2013-03-08 2020-02-11 National Oilwell Varco, L.P. Vector maximizing screen

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BE638716A (en)
AT246057B (en) 1966-03-25
GB1059355A (en) 1967-02-22
CH415471A (en) 1966-06-15

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