GB1333860A - Hydraulic-pneumatic weight control and compensating apparatus - Google Patents

Hydraulic-pneumatic weight control and compensating apparatus

Info

Publication number
GB1333860A
GB1333860A GB3761871A GB3761871A GB1333860A GB 1333860 A GB1333860 A GB 1333860A GB 3761871 A GB3761871 A GB 3761871A GB 3761871 A GB3761871 A GB 3761871A GB 1333860 A GB1333860 A GB 1333860A
Authority
GB
United Kingdom
Prior art keywords
liquid
pressure
gas
piston
accumulators
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3761871A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vetco Inc
Original Assignee
Vetco Offshore Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vetco Offshore Industries Inc filed Critical Vetco Offshore Industries Inc
Publication of GB1333860A publication Critical patent/GB1333860A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • E21B19/09—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/02—Devices for facilitating retrieval of floating objects, e.g. for recovering crafts from water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • F15B11/0725—Combined pneumatic-hydraulic systems with the driving energy being derived from a pneumatic system, a subsequent hydraulic system displacing or controlling the output element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/555—Pressure control for assuring a minimum pressure, e.g. by using a back pressure valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S254/00—Implements or apparatus for applying pushing or pulling force
    • Y10S254/90—Cable pulling drum having wave motion responsive actuator for operating drive or rotation retarding means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S60/00—Power plants
    • Y10S60/907—Working member positioned against counterforce by constantly applied motive fluid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

1333860 Taking up slack in flexible elements VETCO OFFSHORE INDUSTRIES Inc 11 Aug 1971 [4 Sept 1970] 37618/71 Heading B8B [Also in Divisions E1 and F1] Means for maintaining constant stress in a pipe or cable comprising: cylinder means having piston means, one of the means being connectible to the pipe or cable; and means for maintaining liquid under pressure on one side of the piston means, the means for maintaining the liquid under pressure comprising gas exerting pressure on the liquid. Fig. 3 shows the invention applied to sub-aqueous drilling to maintain constant stress in a drill string (not shown) supported by a floating vessel. The pistons 14 are connected to a member 10 carrying the hook (not shown), the cylinders 13 are connected to a member 11 supported by the travelling block E, and accumulators 17 supply the liquid to the undersides of the pistons. The parts 21, 22 of the accumulators are filled with the liquid and the gas (nitrogen), respectively, pistons 24 being interposed between the liquid and gas. Gas from storage cylinders 29 is supplied through a pressure regulator 34 to the parts 22. Liquid from a tank 38a is supplied to the parts 21 by a pump 40, the supply being controlled by a differential pressure switch 48 actuating a valve 49 and subjected to the pressures of the gas and liquid. Should the liquid pressure drop below that of the gas in the parts 22 due to the pistons 24 contacting the bottoms of the accumulators, the switch 48 closes and liquid is pumped to the parts 21. If the liquid pressure is greater than that of the gas in the accumulators, the excess pressure is reduced by a differential valve 80. Should the liquid pressure become excessive due to the pistons 24 contacting the tops of the accumulators, the valve 80 opens to reduce the liquid pressure. The cylinders 13 above the piston 14 are filled with nitrogen from a cylinder 62, a pressure gauge 68 giving an indication of the position of the piston 14. Fig. 4 shows the invention applied to crane used for loading a barge, a load supported by the hook 103 having a reduced impact action on the barge when floating in heavy seas. A line 105 running between the travelling block 104 and the drawworks 112 passes round a pulley 108 on the rod 109 of the piston 110 working in the cylinder 111 which is fixed to the frame of the crane, and liquid in the cylinder below the piston is maintained at a substantially constant pressure by means of a system similar to that of Fig. 3.
GB3761871A 1970-09-04 1971-08-11 Hydraulic-pneumatic weight control and compensating apparatus Expired GB1333860A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6975870A 1970-09-04 1970-09-04

Publications (1)

Publication Number Publication Date
GB1333860A true GB1333860A (en) 1973-10-17

Family

ID=22091033

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3761871A Expired GB1333860A (en) 1970-09-04 1971-08-11 Hydraulic-pneumatic weight control and compensating apparatus

Country Status (8)

Country Link
US (1) US3718316A (en)
JP (1) JPS5130521B1 (en)
CA (1) CA949552A (en)
DE (1) DE2143943C3 (en)
FR (1) FR2105240B1 (en)
GB (1) GB1333860A (en)
NL (1) NL153634B (en)
NO (1) NO133282C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115281181A (en) * 2022-08-06 2022-11-04 王海平 Stem cell cryopreservation system and stem cell cryopreservation method

Families Citing this family (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4175342A (en) * 1972-01-28 1979-11-27 Goyo Ballast Company Ltd. Suction dredger
US3804183A (en) * 1972-05-01 1974-04-16 Rucker Co Drill string compensator
FR2183384A5 (en) * 1972-05-05 1973-12-14 Inst Francais Du Petrole
US3894582A (en) * 1972-06-08 1975-07-15 Kammerer Jr Archer W Slack removal apparatus
US3871622A (en) * 1972-07-25 1975-03-18 Vetco Offshore Ind Inc Method and apparatus for the control of a weight suspended from a floating vessel
GB1397880A (en) * 1973-10-09 1975-06-18 Brown Brothers & Co Ltd Heave compensating device for marine
US3912227A (en) * 1973-10-17 1975-10-14 Drilling Syst Int Motion compensation and/or weight control system
US3943868A (en) * 1974-06-13 1976-03-16 Global Marine Inc. Heave compensation apparatus for a marine mining vessel
US4036247A (en) * 1976-03-15 1977-07-19 Vetco Offshore Industries, Inc. Multi-pressure, single line supply system
NO770299L (en) * 1977-01-28 1978-07-31 Stroemmen Staal A S SYSTEM FOR ACTIVE COMPENSATION OF UNDESIRED RELATIVE MOVEMENTS, PREFERREDLY DURING TRANSFER OF LOAD
FR2405206A1 (en) * 1977-10-04 1979-05-04 Simon Francois LIFTING EQUIPMENT, ESPECIALLY FOR WORK ON WATER
GB1598351A (en) * 1977-10-27 1981-09-16 Morrison A J S Sea swell compensation
US4354608A (en) * 1979-06-08 1982-10-19 Continental Emsco Company Motion compensator and control system for crane
US4379657A (en) * 1980-06-19 1983-04-12 Conoco Inc. Riser tensioner
US4362438A (en) * 1980-10-03 1982-12-07 A/S Akers Mek. Verksted Supporting device
US4432420A (en) * 1981-08-06 1984-02-21 Exxon Production Research Co. Riser tensioner safety system
US4535972A (en) * 1983-11-09 1985-08-20 Standard Oil Co. (Indiana) System to control the vertical movement of a drillstring
US4858694A (en) * 1988-02-16 1989-08-22 Exxon Production Research Company Heave compensated stabbing and landing tool
US4892202A (en) * 1988-04-28 1990-01-09 Amca International Corporation Deepwater extended hook travel attachment
US5209302A (en) * 1991-10-04 1993-05-11 Retsco, Inc. Semi-active heave compensation system for marine vessels
US6408956B1 (en) * 1997-10-15 2002-06-25 Ingersoll-Rand Company Feed system for a rotary drill tower
NO317079B1 (en) * 2002-08-02 2004-08-02 Maritime Hydraulics As The riser Trekka scheme
US20040099421A1 (en) * 2002-11-27 2004-05-27 Expro Americas, Inc. Motion compensation system for watercraft connected to subsea conduit
US6968900B2 (en) * 2002-12-09 2005-11-29 Control Flow Inc. Portable drill string compensator
US7008340B2 (en) * 2002-12-09 2006-03-07 Control Flow Inc. Ram-type tensioner assembly having integral hydraulic fluid accumulator
US7293670B2 (en) * 2004-09-08 2007-11-13 Mhe Technologies, Inc. Upper block
US20060180314A1 (en) * 2005-02-17 2006-08-17 Control Flow Inc. Co-linear tensioner and methods of installing and removing same
NO329688B1 (en) * 2006-06-01 2010-11-29 Nat Oilwell Norway As Lift system device
US8162062B1 (en) * 2008-08-28 2012-04-24 Stingray Offshore Solutions, LLC Offshore well intervention lift frame and method
NO332769B2 (en) 2009-12-15 2013-01-14 Wellpartner As Device for safety connection for pipe string suspension
DE102010032415A1 (en) * 2010-07-27 2012-02-02 Hydac Technology Gmbh Apparatus for recovering energy
US8770272B2 (en) * 2011-05-18 2014-07-08 Halliburton Energy Services, Inc. Managing tensile forces in a cable
CN102900382A (en) * 2011-07-28 2013-01-30 吴江市宏亿纺织有限公司 Hydraulic cathead device
NO334005B2 (en) 2012-03-12 2013-11-11 Depro As Device for compensation of wave-induced distance variations on drill string
AU2013205798B2 (en) * 2013-05-09 2016-02-11 Icon Engineering Pty Ltd Heave compensation and tensioning apparatus, and method of use thereof
AU2014221196B2 (en) 2014-09-02 2016-07-07 Icon Engineering Pty Ltd Coiled tubing lift frame assembly and method of use thereof
CN105672237B (en) * 2016-01-16 2017-03-15 华能澜沧江水电股份有限公司 Hydraulic ship lift with anti-overturning capability
NL2018811B1 (en) * 2017-04-28 2018-11-05 Itrec Bv Drilling rig comprising tubular stand handling system
CN113620170B (en) * 2021-08-10 2023-04-07 华能国际电力股份有限公司上海石洞口第二电厂 Automatic anchoring system of port machine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT315176A (en) *
US3158208A (en) * 1962-04-06 1964-11-24 Lamphere Jean K Safety weight control and compensating apparatus for subsurface well bore devices
US3158206A (en) * 1962-07-26 1964-11-24 Lamphere Jean K Hydraulic weight control and compensating apparatus
US3208728A (en) * 1962-11-19 1965-09-28 Exxon Production Research Co Apparatus for use on floating drilling platforms
DE1224577B (en) * 1963-12-17 1966-09-08 Teves Kg Alfred Automatic, pressure-dependent accumulator shut-off valve for hydraulic systems
US3259371A (en) * 1964-09-18 1966-07-05 Shell Oil Co Wave cancellation system for a floating drilling vessel
GB1077284A (en) * 1965-10-19 1967-07-26 Shell Int Research Method and apparatus for carrying out operations on a well under water
US3403728A (en) * 1965-12-17 1968-10-01 Transp Engineering Inc Apparatus for the suspension of well bore devices
US3343810A (en) * 1966-05-25 1967-09-26 Paul E Parnell Dynamic load compensation system
US3524465A (en) * 1968-09-03 1970-08-18 Hypro Inc Unloader valve assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115281181A (en) * 2022-08-06 2022-11-04 王海平 Stem cell cryopreservation system and stem cell cryopreservation method
CN115281181B (en) * 2022-08-06 2023-11-24 陕西三八妇乐科技股份有限公司 Stem cell cryopreservation system and stem cell cryopreservation method

Also Published As

Publication number Publication date
NL153634B (en) 1977-06-15
DE2143943C3 (en) 1974-06-20
NL7111736A (en) 1972-03-07
DE2143943B2 (en) 1973-11-22
DE2143943A1 (en) 1972-03-09
CA949552A (en) 1974-06-18
US3718316A (en) 1973-02-27
JPS5130521B1 (en) 1976-09-01
NO133282C (en) 1976-04-07
FR2105240B1 (en) 1974-03-15
NO133282B (en) 1975-12-29
FR2105240A1 (en) 1972-04-28
AU3241571A (en) 1973-02-22

Similar Documents

Publication Publication Date Title
GB1333860A (en) Hydraulic-pneumatic weight control and compensating apparatus
US3208728A (en) Apparatus for use on floating drilling platforms
US4351261A (en) Riser recoil preventer system
US3793835A (en) Variable rate hydraulic-pneumatic weight control and compensating apparatus
US3785445A (en) Combined riser tensioner and drill string heave compensator
US3946559A (en) Heave compensating devices for marine use
GB1483538A (en) Heave compensator
NO800211L (en) MOVEMENT COMPENSATION FOR MOVEMENT AND / OR FOR WEIGHT ADJUSTMENT, IN A CONSTRUCTION CARRYING A LOAD
AU2017271305B2 (en) Transportable inline heave compensator
AU2017222997B2 (en) Mobile Active Heave Compensator
GB1333859A (en) Running strings disposed in subaqueous well bores
CA1096749A (en) Hydraulic control apparatus
US3743249A (en) Heave compensator
CN109231050B (en) Cable slack compensation device of scientific investigation ship winch system and application method thereof
US4215851A (en) System for active compensation of unwanted relative movements, preferably during loading of cargo
US4373332A (en) Movement compensation arrangement
US3163005A (en) Apparatus for use on floating drilling platforms
US3469820A (en) Drill pipe stabilizing apparatus
US4867418A (en) Apparatus for increasing the load handling capability of support and manipulating equipment
US3499629A (en) Constant tension chain jack assembly
US3606854A (en) Apparatus for synchronizing movements in anchor cable and a load cable
US4098491A (en) Methods and apparatus for the control of a suspended weight from a floating vessel
US3511476A (en) Sheave assembly for offshore drilling rigs
US4003472A (en) Crane hook heave compensator and method of transferring loads
NO830764L (en) COMPENSATIVE DEVICE FOR MARINE STIGROS

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee