CN1021129C - Measuring and detecting system for volume pump and pump having this system - Google Patents
Measuring and detecting system for volume pump and pump having this system Download PDFInfo
- Publication number
- CN1021129C CN1021129C CN 87106757 CN87106757A CN1021129C CN 1021129 C CN1021129 C CN 1021129C CN 87106757 CN87106757 CN 87106757 CN 87106757 A CN87106757 A CN 87106757A CN 1021129 C CN1021129 C CN 1021129C
- Authority
- CN
- China
- Prior art keywords
- pump
- drain chamber
- bleed valve
- sensor
- pressure
- 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 - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0201—Position of the piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/03—Pressure in the compression chamber
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Measuring Volume Flow (AREA)
- Measuring Fluid Pressure (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
A system for measuring the flow rate of fluids discharged from positive-displacement pumps, and real-time monitoring of these pumps. The system comprises pressure and proximity sensors and a microcomputer. The pressure sensors transmit the pressure in the discharge chambers of the pumps to the microcomputer in the form of signals. The proximity sensors provide a reference in the operating cycle of the pumps. The computer monitors sensor status and processes the data received from the sensors to provide monitoring of the pump. It transmits the results via a serial communications bus. In the event of a malfunction, an alarm is transmitted.
Description
Involved in the present invention is a kind of automatic flow measurement and the monitoring system of positive displacement pump.
Existing measuring system is suitable for generally measuring that to have a kind of eigenwert at least be constant fluid.The universal flow that does not also have a kind of need not the recalibration now and the various fluids that positive displacement pump may be carried are accurately measured.The characteristic of various fluids may alter a great deal, and they may be high-viscosity fluid or general liquid stream, and may conduct electricity also may be non-conductive, and having suspended particle may not have yet, and may be liquid, may be gas etc. yet.May be laminar flow when mobile, also may be turbulent flow.The existing now multiple flowmeter that is suitable for measuring particular fluid, but also do not have a kind of flowmeter that can accurately measure all various fluids.The present invention can measure the flow of any fluid of discharging from positive displacement pump.The character of fluid promptly is the accuracy that laminar flow or turbulent flow do not influence measurement.
The present invention has utilized the volume pumping performance of positive displacement pump.The reciprocal time that a kind of method commonly used is a calculating pump also multiply by this numerical value in theory the volume of once back and forth discharging.As long as pump and pumping condition are good, this measuring method is exactly accurately.
Yet,, measure with such system and will become very inaccurate if any condition is destroyed in two conditions.Consider now an opposite extreme situations, suppose that promptly the pumping condition is bad to the fluid of wanting pumping even can not arrive in the pump, yet this but will be as condition just often, And does not influence the operation of pump.Although And does not have fluid to discharge Shang the Shi Ji, flowmeter will indicate and the proportional flow of pump speed.This indication is full of prunes.This is an extreme example, still, can run into the situation that is not full of pump chamber at the suction stage fluid fully often.In this case, because the volume that the volume ratio of actual pumping should be discharged in theory is little, the method for this calculating umber of reciprocation has error.
The present invention utilizes the technology of the reciprocal time of this calculating pump, and proofreaies and correct it by measuring each back and forth actual fluid volume of discharging.Utilize this method,, can both carry out the correct measurement of flow regardless of the condition and the pumping condition of pump.
In order to measure the fluid volume of the actual discharge of pump, must know the duty of the hydraulic part of pump.Thereby, need carry out continual monitoring to the duty of pumping condition and pump.Cause leaking or the valve spring fracture if valve damages, this system will measure and leak also calibrated flow value in view of the above.As far as we know, existing systems is not that the method that is used in valve or detection of piston bush place and correction leakage is monitored.Leak or spring breakage is normally detected by the operator and reported to the police by the vibration of the noise of pump or fluid circulating line.System of the present invention can carry out continuous automatic monitoring to these mechanical faults.
Monitoring is undertaken by microcomputer.If some parameter meets or exceeds predetermined value, microcomputer will carry out the true(-)running that pump is monitored in necessary calculating.It checks sensing element, then determines to truly have fault through the check of several cycles.If fault is determined, then microcomputer is about to data and sends out, and carries out the required measurement of flux modification.
The data that transmit generally are the fluid volume values of flow value and the actual discharge of pump, and the value that provides of " the pump state of pumping condition " indicator.In fact, the latter is the volumetric efficiency of pump, that is, and and the ratio of the volume that actual volume of discharging and intact pump are discharged under perfect condition in theory.This indicator is exceedingly useful to observing pump to the reaction of pumping condition changing.If because operator's action or external action make pumping improvement of terms or deterioration, the operator can know immediately.Valve or piston bush leak, and spring breakage and sensing element misoperation also are sent out.
Fig. 1 shows the example that system of the present invention connects;
Fig. 2 is the sectional view of the pressure space in a kind of positive displacement pump (piston pump) example;
Fig. 3 is the shop drawing of microcomputer architecture;
Fig. 4 utilizes pressure and displacement sensor, by calculate a sets of curves of selecting from the curve of a process pump.
The pressure curve of two drain chamber in the three cylinder pump that shown in Figure 5 is and moving-member are in the moment when static.
Among each figure, the identical identical parts of label representative.
Among Fig. 1, the 1st, central authorities show and detecting unit that it monitors and write down the operation conditions of pump in real time to one group of positive displacement pump.The 2nd, for the monitoring element on the spot of pump operator use.The 3rd, micro computer unit is a part of the present invention.According to the layout of microcomputer, they can connect one or several positive displacement pumps.In Fig. 1, these microcomputers connect 4, one five cylinder pumps 5 of two three cylinder pumps from left to right in turn, connect two three cylinder pumps 4 again.Show and detecting unit 1 and utilize a multiple spot tandem data bus to make on the spot between the monitoring means 2 to increase or remove a certain equipment and become simply in central authorities.Used a similar bus on the spot between monitoring means 2 and the microcomputer 3,, also used one to lead to the branch line of monitoring means 2 on the spot so that other sensing element is connected with microcomputer 3.
The quantity of the pressure transducer 6 that links to each other with microcomputer 3 equals the quantity sum total of the drain chamber 7 of the pump 4 that links to each other with microcomputer or pump 5.The quantity of proximity transducer 8 equals to connect the number of pump 4 or pump 5.In other words, each drain chamber 7 must be furnished with a pressure transducer 6, and every pump 4 or pump 5 must be furnished with a proximity transducer 8.
Preferred embodiment of the present invention comprises the stroke of detection ring (B) (on piston) and provides characteristic that the sensor 8 of position object of reference selects object of reference in a known manner to be fit to sensor that best example is the steel loop that is detected by inductive proximity sensor 8.
Another example comprises an optical sensor relevant with piston glazing object of reference or comprises a hall effect sensor relevant with the object of reference that is made of magnet.
For example, by detecting on the piston actuated wheel one, or utilize the sensor, also all can obtain the stroke object of reference of pump with reference to the stroke of tooth or by detecting the stroke of the similar parts that link to each other with piston machine.
Fig. 2 is the sectional view of the drain chamber 7 of a positive displacement pump 4 or 5, and positive displacement pump 4 or 5 essential characteristic be, drain chamber 7 is owing to the to-and-fro movement of slide block 9 is full of by fluid, and then, fluid is pumped to discharging loop 10.The flow direction of fluid is determined by suction valve 11 and bleed valve 12.
Best configuration is on the inboard of the pressure transducer 6 cover of plunger P that is contained in drain chamber 7.Like this, sensor can not reduce pump housing intensity.Yet,, sensor evenly can be installed in another flat of drain chamber if this solution is too complicated technically.
The general work principle of pump is as follows: when slide block 9 from rest position (be equivalent to maximum and remove the position) when advancing to drain chamber 7, the fluid in the drain chamber at first is discharged into and sucks loop 20 and close up to reverse checkvalve 11, the flowing of block fluid.Then, fluid is pressed into drain chamber 7 and is added to the pressure of bleed valve 12 greater than discharging loop 10 and spring 14 pressurizations this moment to the pressure on the valve 12 in chamber 7.At this moment, bleed valve is opened, and fluid is discharged into the discharging loop.The fluid volume of supplying with discharging loop 10 equals slide block 9 residing position when bleed valve is opened and advances to the volume that the rest position (being equivalent to enter position the most deep in the drain chamber) the drain chamber is discharged.
For most of positive displacement pumps, this estimation is not enough, and when rest position (deep position) firm withdraw from of slide block 9 from drain chamber, bleed valve not necessarily just cuts out, particularly when pump runs at high speed.Therefore, understand some fluid and flow back in the drain chamber 7, close up to bleed valve.This part fluid must deduct from the fluid volume be discharged to discharging loop 10 by pump; It waits with slide block 9 rest point from drain chamber (the most deep position) before bleed valve cuts out and withdraws from the volume that is sucked.
Fig. 3 is the block scheme of microcomputer.15 is the microprocessor systems with clock, bus and memory.A certain amount of data of insurance memory 16 storages have particularly been stored the pump 4 that links to each other with microcomputer and each corrected value of pump 5.These numerical value can calculate one by one to slide block 9 bulking value that discharge the position during 12 opening and closing from the rest position to the bleed valve.The 17th, the link that is connected with the multiple spot serial bus.In addition, pressure transducer 6 links to each other with microcomputer 15 by breakout box 18.Equally, link to each other with microcomputer system 15 by breakout box 19 near detecting device 8.6,8,18 and 19 quantitatively can satisfy each drain chamber a pressure transducer 6 and a breakout box 18 are arranged, and each pump 4 or 5 has a proximity transducer 8 and a breakout box 19.
Fig. 4 shows three curves with respect to the time.Curve 21 show measure bleed valve 12 positions the emission sensor output signal over time.In starting point, valve 12 is transfixion on its valve seat, and this moment, curve was in maximal value.Along with curve begins to descend, this shows that valve 12 removes from its valve seat, and then, fluid begins to be discharged into discharging loop 10.
Known initial time, promptly slide block 9 is in the moment and valve 12 moment that begin lift off a seat of rest position when (being equivalent to withdraw from farthest) from chamber 7, just can calculate the volume that slide block 9 was discharged between this two moment.Curve 22 representative is from the signal of the sensor 6 that is arranged in drain chamber 7, and the bleed valve 12 of itself and observed aperture position is corresponding.Curve 23 is curve derived functions of 22 pairs of times.Studies show that in performance history of the present invention utilizes the differentiate curve can bring technical improvement.A part of the present invention is to utilize a pressure transducer 6 to detect the opening and closing of bleed valve 12: utilizing movable sensor is not always to be suitable for measuring moving of pump internal valve 12, and pressure transducer does not have moving-member, the pressure that the energy bearing pump produces.In addition, pressure transducer 6 is than measuring the more information that movable sensor that bleed valves 12 move can provide relevant pump work state.The definite moment that the peak of curve 23 is opened corresponding to valve 12; This is used in the software of microcomputer 3.Determine the moment that valve 12 is opened according to the waveform of representing the signal of pressure in the drain chamber 7, the close moment of bleed valve 12 is also determined in the same way.
In another form of the present invention, determine that bleed valve 12 opening and closing another kind of technology constantly is, the signal of the sensor of similar type compares in the signal that is used to pressure transducer 6 in the self-discharging chamber 7 and the discharging loop 10: when signal equates, and bleed valve 12 unlatchings.If the pressure in the drain chamber is lower than the pressure in the discharging loop 10, bleed valve 12 cuts out.Because need enough accurate pressure sensors just can compare, this technology faces many difficulties.(although sensor is not very accurate, utilizes the related algorithm can be to proofreading and correct from the signal of sensor and in real time relatively yet, yet, can prove and utilize this algorithm, may be oversize the real-time requirement in practical application).
Concerning some was used, pumping was well-regulated: any variation of the volumetric efficiency of pump all is very slow with respect to the calculating that the travelling speed and the microcomputer 3 of pump carries out.In this case, the situation that the volumetric efficiency of pump remains unchanged in several pumping circulation can appear usually.Therefore, be necessary to carry out efficiency calculation one time, and several pumps are linked on the given microcomputer 3 every several cycles.
Fig. 5 shows the signal 24 and 25 from two pressure transducers 6 in two drain chamber 7.Represent the pressure transducer 6 of its signal to be arranged in bleed valve 12 drain chamber 7 working properly by curve 24, and the pressure transducer 6 that its signal is represented by curve 25 is arranged in bleed valve 12 out of order drain chamber 7, because fault is arranged, when bleed valve 12 is motionless on its valve seat, just has one leakage and flow to drain chamber 7 from discharging loop 10.Pressure in the discharging loop 10 is greater than the pressure that sucks loop 20.On behalf of each drain chamber slide block 9, vertical line be in the static moment.The present invention partly is based on such observations: curve 24 expressions, and before slide block 9 stopped, the pressure in the drain chamber 7 can not increase, and before slide block 9 stopped, the pressure in the out of order drain chamber 7 of bleed valve then really can increase.
Can carry out same observation to the fault that occurs in suction valve 11 and piston bush place or the fracture of spring 13 and 14.These observationss are used to determine the state of valve, piston bush and spring by the software of microcomputer 3.
When detecting leakage (supposing that blowdown presssure is enough high), just can measure the amount of leak fluid by the development of analyzing pressure increase curve in the drain chamber 7.
When native system was worked, microcomputer carried out that memory had many contents are as follows described (but needn't by given order):
-connect microprocessor (15) power supply and preset initial value;
-obtain data from pressure transducer 6 and proximity transducer 8;
-utilize one of said method to calculate the opening and closing moment of the bleed valve 12 of each drain chamber 7;
The state of-testing pump (whether working) according to circumstances calculates travelling speed;
-the signal of analyzing proximity transducer 8 calculates the stopping constantly of slide block 9 of each drain chamber 7;
The fluid volume of-calculating actual discharge and refluence enter the volume in each drain chamber 7;
-two numerical value relatively determining and calculate are so that begin to carry out situation and the calculating of operate as normal and the calculating of any leakage of each parts of testing pump;
Each pump volumetric efficiency of-calculating;
The integrated flux and the volume of each pump of-calculating;
-by data bus transmission data;
-when requiring, carry out the test routine that is stored in the permanent memory or specific calibration procedure, or transmit some parameter as monitoring means on the spot.
Can design enough flexibly in actual applications according to system of the present invention, make it and to use together with the positive displacement pump of various different types.
The display board of accompanying drawing 6 expressions control module of the present invention.It has more clearly illustrated each step that the present invention is represented, because accurately and accurately measure flow and the volume except requiring, it can also directly be read volumetric efficiency and demonstrate operation troubles." drain chamber " window that light emitting diode LED is housed can demonstrate the fault that drain chamber and related valves take place.This makes the operator can carry out the most effective intervention immediately, yet this is for existing system, is impossible.
Claims (5)
1, a kind of system to measuring from the flow of volumetric pump discharging and pump being monitored in real time, described pump is equipped with at least one piston (9) and a corresponding drain chamber (7), a bleed valve (12) and at least one sensor (6), this sensor can be by observing the pressure of each drain chamber of different time (7), thereby detect the accurate opening and closing time of at least one bleed valve (12), the system is characterized in that:
Sensor signal from each pump or several pumps is admitted to microcomputer unit (3), it utilizes the derived curve (23) of bleed valve (12) and the position curve (22) that is obtained by drain chamber pressure transducer (6), or be used to opening and closing time of relatively detection bleed valve (12) of signal of the pressure transducer in the signal of self-discharging chamber pressure sensor and discharging loop (10), it can also calculating pump volumetric efficiency, each unit links to each other with a monitoring means on the spot (2) that uses for pump operator, and unit (2) show with central authorities and link to each other with monitoring means (1).
2, according to the system of claim 1, it is characterized in that: the connection between monitoring means (2) and the central location (1) is undertaken by a multiple spot tandem data bus on the spot.
3, according to the system of claim 2, it is characterized in that: unit (3) link to each other by a multiple spot tandem data bus with local unit (3).
4, according to the system of claim 1-3, it is characterized in that: it comprises a proximity transducer (8) and breakout box (19), is used for the final position at the indoor detection piston of being considered.
5, according to the system of claim 4, it is characterized in that: the signal of analyzing proximity transducer (8) then utilizes the volumetric efficiency value accurately to proofread and correct the theory flow rate of pump so that the actual flow rate in the acquisition drain line so that the volumetric efficiency of pump to be provided.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8614088A FR2605059B1 (en) | 1986-10-08 | 1986-10-08 | FLOW MEASUREMENT AND MONITORING SYSTEM FOR POSITIVE DISPLACEMENT PUMPS AND PUMPS PROVIDED WITH SUCH SYSTEMS |
| FR8614088 | 1986-10-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87106757A CN87106757A (en) | 1988-08-10 |
| CN1021129C true CN1021129C (en) | 1993-06-09 |
Family
ID=9339728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87106757 Expired - Fee Related CN1021129C (en) | 1986-10-08 | 1987-10-07 | Measuring and detecting system for volume pump and pump having this system |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0264148B1 (en) |
| JP (1) | JPS63105291A (en) |
| CN (1) | CN1021129C (en) |
| BR (1) | BR8705330A (en) |
| DE (1) | DE3769429D1 (en) |
| FR (1) | FR2605059B1 (en) |
| NO (1) | NO874201L (en) |
| SU (1) | SU1556547A3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101563541B (en) * | 2006-11-30 | 2013-07-10 | 恩特格里公司 | System and method for operation of a pump |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4976144A (en) * | 1988-08-25 | 1990-12-11 | Fisher Controls International, Inc. | Diagnostic apparatus and method for fluid control valves |
| US5197328A (en) * | 1988-08-25 | 1993-03-30 | Fisher Controls International, Inc. | Diagnostic apparatus and method for fluid control valves |
| AU632759B2 (en) * | 1988-08-25 | 1993-01-14 | Fisher Controls International Inc. | Diagnostic apparatus and method for fluid control valves |
| US5109692A (en) * | 1988-08-25 | 1992-05-05 | Fisher Controls International Inc. | Diagnostic apparatus and method for fluid control valves |
| EP0487507B1 (en) * | 1988-08-26 | 1995-10-18 | ITT Automotive Europe GmbH | Method for monitoring a hydraulic brake system and a brake system for carrying out this method |
| US5027661A (en) * | 1989-12-18 | 1991-07-02 | Master Flo Technology Inc. | Liquid flow metering |
| US5111690A (en) * | 1990-07-09 | 1992-05-12 | Westinghouse Electric Corp. | Valve stem load monitoring system with means for monitoring changes in the valve yoke elongation |
| DE4040919A1 (en) * | 1990-12-20 | 1992-06-25 | Krupp Maschinentechnik | MEASURING DEVICE FOR DETECTING CHARACTERISTIC SIZES WHICH MAKE THE WORKING METHOD OF HYDRAULIC AGGREGATES DETECTABLE |
| JPH04311685A (en) * | 1991-04-10 | 1992-11-04 | Sanden Corp | Compressor |
| EP0582625B2 (en) * | 1991-05-03 | 2005-01-05 | MEINZ, Hans Willi | Process and device for the controlled metering of at least one pourable component |
| DE4209679A1 (en) * | 1992-03-25 | 1993-12-16 | Schwing Gmbh F | Pump for thick fluids like mud - has piston in cylinder with inlet and outlet valves plus computer to determine volume flow exactly |
| DE59610857D1 (en) * | 1996-09-28 | 2004-01-22 | Maag Pump Systems Textron Ag Z | Method and device for monitoring system units |
| ITMI20022642A1 (en) * | 2002-12-16 | 2004-06-17 | Nuovo Pignone Spa | METHOD AND SYSTEM FOR MONITORING AN ALTERNATIVE COMPRESSOR. |
| DE102005005940B4 (en) * | 2005-02-10 | 2006-12-14 | Sauer-Danfoss Aps | Apparatus and method for determining parameters of a hydraulic machine |
| US8366402B2 (en) | 2005-12-20 | 2013-02-05 | Schlumberger Technology Corporation | System and method for determining onset of failure modes in a positive displacement pump |
| US20080040052A1 (en) * | 2006-08-11 | 2008-02-14 | Toshimichi Wago | Pump Monitor |
| CN101782061A (en) * | 2010-03-14 | 2010-07-21 | 苏州工业园区华西泵业有限公司 | Spinning pump test bed |
| US8757986B2 (en) * | 2011-07-18 | 2014-06-24 | Schlumberger Technology Corporation | Adaptive pump control for positive displacement pump failure modes |
| CN110090749B (en) * | 2014-05-15 | 2022-04-26 | 诺信公司 | Pump for powder coating material system, and diagnostic device and diagnostic method |
| CN105928585B (en) * | 2016-04-15 | 2019-02-19 | 徐州徐工施维英机械有限公司 | Conveying cylinder conveying capacity metering method and metering device and transportation system |
| US10378537B2 (en) | 2016-10-06 | 2019-08-13 | Caterpillar Inc. | System for detecting failure location in a pump |
| CN106996850A (en) * | 2017-03-30 | 2017-08-01 | 杭州石林自动化工程有限公司 | A kind of piston manometer full-automatic pressure source |
| CN107939661A (en) * | 2017-12-04 | 2018-04-20 | 西南石油大学 | A kind of pressure break pump hydraulic end running parameter real-time monitoring system |
| CN108303243A (en) * | 2018-01-31 | 2018-07-20 | 嘉兴林众电子科技有限公司 | Micro pump flow testing system |
| CN108757425A (en) * | 2018-05-16 | 2018-11-06 | 四川宏华电气有限责任公司 | A kind of fracturing pump state of health monitoring system and method |
| DE102018121760A1 (en) * | 2018-09-06 | 2020-03-12 | Brinkmann Pumpen K.H. Brinkmann Gmbh & Co. Kg | Procedure for the detection of leakages in a positive displacement pump |
| DE102020127285B3 (en) | 2020-10-16 | 2022-01-20 | K.H. Brinkmann GmbH & Co Kommanditgesellschaft | Method of detecting leakage from a positive displacement pump |
| CN115506762A (en) * | 2021-06-03 | 2022-12-23 | 中国石油天然气集团有限公司 | Method and device for detecting hydraulic end fault of fracturing pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3779457A (en) * | 1971-06-28 | 1973-12-18 | Trw Inc | Data normalizing method and system |
| US4526513A (en) * | 1980-07-18 | 1985-07-02 | Acco Industries Inc. | Method and apparatus for control of pipeline compressors |
| FR2573136B1 (en) * | 1984-11-15 | 1989-03-31 | Schlumberger Cie Dowell | METHOD FOR OBSERVING PUMPING CHARACTERISTICS ON A POSITIVE DISPLACEMENT PUMP AND PUMP FOR CARRYING OUT THIS METHOD. |
-
1986
- 1986-10-08 FR FR8614088A patent/FR2605059B1/en not_active Expired - Fee Related
-
1987
- 1987-09-09 EP EP87201707A patent/EP0264148B1/en not_active Expired - Lifetime
- 1987-09-09 DE DE8787201707T patent/DE3769429D1/en not_active Expired - Fee Related
- 1987-10-06 SU SU874203432A patent/SU1556547A3/en active
- 1987-10-07 NO NO874201A patent/NO874201L/en unknown
- 1987-10-07 JP JP25176187A patent/JPS63105291A/en active Pending
- 1987-10-07 CN CN 87106757 patent/CN1021129C/en not_active Expired - Fee Related
- 1987-10-07 BR BR8705330A patent/BR8705330A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101563541B (en) * | 2006-11-30 | 2013-07-10 | 恩特格里公司 | System and method for operation of a pump |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2605059B1 (en) | 1991-02-08 |
| FR2605059A1 (en) | 1988-04-15 |
| CN87106757A (en) | 1988-08-10 |
| SU1556547A3 (en) | 1990-04-07 |
| BR8705330A (en) | 1988-05-24 |
| JPS63105291A (en) | 1988-05-10 |
| NO874201L (en) | 1988-04-11 |
| EP0264148A1 (en) | 1988-04-20 |
| EP0264148B1 (en) | 1991-04-17 |
| DE3769429D1 (en) | 1991-05-23 |
| NO874201D0 (en) | 1987-10-07 |
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