EP0264148B1 - Flow measurement and monitoring system for positive-displacement pumps and pumps equipped with this system - Google Patents
Flow measurement and monitoring system for positive-displacement pumps and pumps equipped with this system Download PDFInfo
- Publication number
- EP0264148B1 EP0264148B1 EP87201707A EP87201707A EP0264148B1 EP 0264148 B1 EP0264148 B1 EP 0264148B1 EP 87201707 A EP87201707 A EP 87201707A EP 87201707 A EP87201707 A EP 87201707A EP 0264148 B1 EP0264148 B1 EP 0264148B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge
- pump
- sensor
- pumps
- chamber
- 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 - Lifetime
Links
Images
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
Description
- This invention consists of an automatic system for the measurement of flow rate and monitoring of positive-displacement pumps, according to the preamble of
claim 1. - Existing measurement systems are generally adequate for the measurement of fluids having at least one constant characteristic. There is no all-purpose flow-meter for accurate measurement without re-calibration of all of the types of fluids likely to be handled by a positive-displacement pump. The characteristics of these fluids may vary widely; they may be highly viscous or fluid, conductors of electricity or not, have solid particles in suspension or not, be liquid or gaseous etc... Flow may also be laminar or turbulent. There are many flowmeters suited to the measurement of specific fluids but none which provides accurate measurement for all of these types of fluid. The Invention provides for measurement of flow rate of any fluid discharged from a positive-displacement pump. The nature of the flow, whether laminar or turbulent, does not affect the accuracy of measurement.
- The invention makes use of the volumetric pumping characteristics of positive-displacement pumps. A technique commonly used is to count the number of pump strokes and to multiply this number by the theoretical volume discharged by one stroke. This method of measurement remains accurate so long as the pump and pumping conditions remain good.
However, if either of these conditions deteriorates, such systems may become highly inaccurate. Consider an extreme case in which the pumping conditions are so bad that the fluid to be pumped does not even reach the pump. This will not prevent the pump from running as though conditions were normal. The flowmeter will still indicate a flow proportional to the speed of the pump even though no fluid is actually discharged. Such an indication is totally false. This is an extreme example, however conditions under which the fluid does not entirely fill the chambers during the suction phase are met frequently. Under these conditions, the counting of the number of strokes method is erroneous as the volume actually pumped is less than the theoretical volume which should be discharged. - Document EP - A - 0183 295 describes a pump equipped with internal sensors. The present invention represents an improvement over EP '295 in that an original monitoring system is proposed leading to an innovative set of oilfield use capabilities.
Document US-A-3 779 457 describes a monitoring system as well as Document US-A-4526 513. - The invention uses the above described technique of counting the number of pump strokes and corrects it by measuring the volume of fluid actually discharged at each stroke. In this way correct measurement of the flow rate is obtained regardless of pumping conditions or the condition of the pump.
- In order to measure the volume of fluid actually discharged by the pump, the operational state of the hydraulic part of the pump must be known. Constant monitoring of pumping conditions and operational condition of the pump are provided. In the event of damage to a valve resulting in a leak or if a valve spring should break, the system will measure the leak and correct the flow rate value accordingly. To our knowledge there are no existing systems which monitor by detection and correction for leaks at the valves or cylinder sleeves: leaks or spring-breaks are usually detected by the operator, alerted by noise from the pumps or vibrations on the fluid circulation lines. The system resulting from this invention will carry out permanent and automatic monitoring of such malfunctions.
- EP-A-0183 295 describes a positive displacement pump equipped with sensors. The preferred sensors are a sensor allowing to give information on the end position of at least one piston, and a sensor allowing to give information on the opening and/or closing time of at least a valve (generally, the outlet valve) in the same chamber.
- The present invention describes an improved monitoring system to be used in connection with at least one of so equipped pumps.
- Monitoring is performed by a microcomputer. If certain parameters reach or exceed pre-determined values, the microcomputer will make the required calculations to monitor correct pump operation. It checks the sensors and then checks over several cycles that the fault is real. If the fault is confirmed the microcomputer transmits the data and takes the measurements required for flow correction.
- The data transmitted are generally the values for the flow and the volume of fluid actually discharged from the pump, as well as a value given by a "pumping conditions and state-of-pump" indicator. The latter is in fact the volumetric efficiency of the pump, i.e. the ratio between the volume actually discharged, over the volume theoretically discharged under perfect pumping conditions with a perfect pump. This indicator is extremely useful for observing the reactions of the pump to variations in pumping conditions. The operator of a pump knows in real time if the pumping conditions have been improved or worsened due to his actions or to external actions. Valve or sleeve leaks, spring-breaks and sensor malfunctions are also transmitted.
- Figure 1 shows an example of connection of the invented system.
- Figure 2 is a cross-section through the compression chamber of an example of a positive-displacement pump (piston pump),substantially as described in EP 0183295.
- Figure 3 is a working drawing for the construction of the microcomputer.
- Figure 4 is a sample of curves obtained from an operating pump with the aid of pressure and displacement sensors and by calculation.
- Figure 5 shows the pressure curves for 2 chambers in a triplex pump and the moments when the moving parts are at rest.
- (The same numerical references indicate the same part on the various figures).
- In figure 1,
item 1 is a central display and checking unit providing real-time monitoring of a set of positive-displacement pumps and recording the pumping operations.Items 2 are the local monitoring elements intended for use by the pump operators.Items 3 are microcomputer units, part of the invention. Depending on their configurations, these microcomputers can be connected to one or several positive-displacement pumps. In figure 1, they are connected successively from left to right to twotriplex pumps 4, aquintuplex pump 5 and then to twotriplex pumps 4 again. The use of a multipoint serial data bus betweenparts parts microcomputer 3, plus the use of a single line tolocal monitoring unit 2. - The number of
pressure sensors 6 connected tomicrocomputer 3 is equal to the sum of the number ofdischarge chambers 7 ofpumps microcomputer 3 is connected. The number ofproximity sensors 8 is equal to the number ofpumps pressure sensor 6 for eachdischarge chamber 7 and aproximity sensor 8 perpump - A preferential mode for realisation of the Invention consists of
sensor 8 detecting the passage of a ring (B) attached to the piston and providing a position reference. In a known manner, the nature of the reference will be selected to suit the sensor; the preferred example would be a steel ring detected by aninductive proximity sensor 8. - Another example consists of an optical sensor associated with an optical reference on the piston or a Hall-effect sensor associated with a reference consisting of a magnet.
- The pump phase reference can also be obtained, for example, by detecting passage of a referenced tooth on a piston drive wheel or similar part mechanically linked to the piston, or by a sensor as described above. Figure 2 is the cross-section through a
discharge chamber 7 of an example of a positive-displacement pump - The principal characteristic of positive-
displacement pumps discharge chamber 7 is filled by the alternating action ofslide 9, and then evacuated intodischarge circuit 10. The direction of fluid flow is established byvalve 11, known as the suction valve, andvalve 12, known as the discharge valve. Movement ofvalves suction valve spring 13 anddischarge valve spring 14, and by the forces exerted by the moving fluid and the pressures indischarge circuit 10, the discharge chamber andsuction circuit 15. - The preferred configuration is with
pressure sensor 6 mounted on the inner side of flap P tochamber 7. In this way the sensor does not weaken the pump body. However, if this solution is technically too complex, the sensor may be installed flush on another flat part of the chamber. - Normal pump operation is as follows : when slide 9 advances into
discharge chamber 7 from its stationary position (point which corresponds to maximum withdrawal), the fluid in the chamber is firstly expelled intosuction circuit 15 until suctionanti-return valve 11 closes, cutting off the fluid flow. - The fluid is then compressed into
discharge chamber 7 until the forces exerted ondischarge valve 12 by the pressure inchamber 7, become greater than the forces on thissame valve 12 by the pressure indischarge circuit 10 plusspring 14. At this moment,discharge valve 12 opens and the fluid is expelled into the discharge circuit. The volume of fluid delivered intodischarge circuit 10 is equal to the volume displaced byslide 9 as the latter advances intochamber 7 from the position it occupied at the moment discharge valve l2 opened, up to its stationary position corresponding to maximum penetration intochamber 7. - For many positive-displacement pumps this calculation is not sufficient : when
slide 9 withdraws fromdischarge chamber 7 from its stationary (maximum-penetration) point, discharge valve l2 is not necessarily closed, especially when the pump is running at high speed. A certain volume of fluid therefore flows back intodischarge chamber 7 untilvalve 12 closes. This volume must be deducted from the volume expelled by the pump intodischarge circuit 10; it is equal to the volume displaced byslide 9 when it withdraws from its stationary (maximum-penetration) point indischarge chamber 7, before closure ofdischarge valve 12. - Figure 3 is a block diagram of a microcomputer unit.
Item 15 is a microprocessor system with its clock, bus and memories. A safeguardedmemory 16 provides for storage of a certain quantity of data, in particular the calibration values ofpumps slide 9 betweem its stationary position and its position at the moments of opening and closing ofdischarge valve 12.Items 17 are connecting parts providing links with the multipoint serial bus. In addition,pressure sensors 6 are connected tomicrocomputer 15 viaadapters 18. Similarly,proximity detectors 8 are connected tomicroprocessor system 15 byadapters 19.Items pressure sensor 6 and anadapter 18 perdischarge chamber 7, and for aproximity detector 8 and anadapter 19 perpump - Figure 4 shows three curves plotted against time.
Curve 21 shows the variations in the output signal from a discharge sensor which measures the position ofdischarge valve 12. At the origin point,valve 12 is at rest on its seat: the curve is at maximum. As the curve begins to drop this indicates thatvalve 12 is moving away from its seat. The fluid then begins to be discharged into thedischarge circuit 10. - Knowing the moment of origin when
slide 9 is in the stationary position corresponding to maximum withdrawal fromchamber 7, plus the moment at whichvalve 12 begins to leave its seat, it is possible to calculate the volume displaced byslide 9 between these two moments.Curve 22 represents the signal from asensor 6 placed indischarge chamber 7 corresponding to dischargevalve 12 whose position is observed.Curve 23 is the derivative in relation to time, ofcurve 22. Research during development of the Invention showed that use of the derived curve brought technical improvements. Part of the Invention consists in using apressure sensor 6 to detect opening and closing of discharge valves 12: use of movement sensor is not always suitable for meas ment of the movement ofvalve 12 inside the pump, whereas a pressure sensor has no moving parts and resists the pressures created by the pumps. Furthermore,pressure sensor 6 gives more information on the operational state of the pump than would a movement sensor measuring the movement ofdischarge valve 12. The highest point ofcurve 23 corresponds to the exact moment of opening of valve 12: this is used in the software ofmicrocomputer 3 to determine the moment of opening ofvalve 12 from the form of the signal representing the pressure in the chamber. The moment of closing ofdischarge valve 12 is calculated in a similar way. - Another technique used to determine the moment of opening and closing of
discharge valves 12 in another configuration of the Invention makes use of the comparison between the signals from apressure sensor 6 indischarge chamber 7 and a pressure sensor of the same type in discharge circuit 10: when the signals are equal,discharge valve 12 is open. If the pressure in the discharge chamber is lower than the pressure indischarge circuit 10,discharge valve 12 will be closed. Some difficulties are encountered with this technique as it requires the use of pressure sensors which are sufficiently accurate to allow for comparison. (The use of correlating algorithms allows for correction and real-time comparison of the signals from the sensors even where the latter are not very accurate. However, use of such algorithms may prove to be too long in relation to the real-time requirements of the application). - For certain applications, pumping is regular: any changes in the volumetric efficiency of the pump take place slowly in relation to the operating speed of the pumps plus the calculations performed by
microcomputer 3. In such cases it is often the case that the volumetric efficiency of the pump does not vary during several pumping cycles. It is therefore necessary to perform the efficiency calculations every n cycles only, and to connect several pumps to a givenmicrocomputer 3. -
Microcomputer 3 calculates the volumetric efficiency of each pump in turn. This value is stored in memory and used as often as necessary, (e.g, every second), along with the pump operating speed, for flow-rate calculation for each pump (the volumetric efficiency value being assumed to be constant since it was calculated for the last time). - Figure 5 shows
signals pressure sensors 6 in twodischarge chambers 7. Thepressure sensor 6 whose signal is represented bycurve 24 is located in adischarge chamber 7 whosedischarge valve 12 is in good working order. On the other hand thepressure sensor 6 whose signal is represented bycurve 25 is in adischarge chamber 7 whosedischarge 12 is defective so that there is a leak fromdischarge circuit 10 to dischargechamber 7 whendischarge valve 12 is at rest on its seat. The pressure indischarge circuit 10 is greater than the pressure insuction circuit 15. The vertical lines represent the moments when the respective discharge chamber slides 9 are stationary. The invention is partly based on the observation that whereascurve 24 shows that the pressure indischarge chamber 7 does not increase before immobilising ofslide 9, the pressure indischarge chamber 7 with afaulty discharge valve 12 does increase before the slide stops. - An observation of the same type may be made for faults occuring at
intake valves 11, the piston sleeves or for breakage ofsprings microcomputer 3 software to determine the state of the valves, sleeves and springs. - When a leak is detected (and provided the discharge pressure is high enough), it is possible to measure the quantity of fluid leaked by analysing the development of the pressure-increase curve in
chamber 7. - When the system is in operation the micro-computer runs a program stored in memory which contains a number of tasks which may be as listed below (but not necessarily in the given order) :
- Energizing and initialisation of microprocessor (15)
- Acquisition of data from
pressure sensors 6 andproximity detectors 19. - Calculation of moments of opening and closing of
discharge valve 12 of eachdischarge chamber 7 by one of the methods indicated above. - Detection of the state of the pump (running or stopped), and calculation of operating speed according to the case.
- Calculation of moments of immobilisation of
slides 9 of eachdischarge chamber 7 by analysis of signals fromproximity detectors 8. - Calculation of volumes of fluid actually discharged and volumes re-introduced into each
discharge chamber 7. - Comparison of values calculated with values determined so as to initiate certain calculations for checking of condition and correct operation of various (pump) parts, plus calculation of any leaks.
- Calculation of volumetric efficiency of each pump.
- Calculation of cumulative flow and volume for each pump.
- Transmission of data via data bus.
- In the event of request from a local monitoring unit, running of test programs or special calibration programs, storing in permanent memory or communication of certain parameters.
-
Microcomputer 3 can perform numerous other calculations and run other programs; those listed above are given by way of example. - The system resulting from the invention is designed to be sufficiently flexible in application to allow it to be used with different types of positive-displacement pumps.
- Appended Figure 6 represents the display panel for the unit, per the invention. This shows more clearly the progress represented by the invention, since in addition to accurate and precise measurement of flow and volume, it provides a direct reading of volumetric efficiency and indicates operating faults. The "Chamber" window equipped with LEDs indicates the chamber in which the fault has appeared as well as the valve concerned. This allows an operator to intervene immediately and with maximum effectiveness which is not possible with presently existing systems.
-
- 1. FLOW
- 2. VOLUMETRIC EFFICIENCY
- 3. VOLUME
- 4. CHAMBER
- 5.
MOTOR 1 - 6. METRIC
- 7. NO
- 8. UNITS
- 9. 1/MIX
- 10. 2/DIAMETER
- 11. SUM
- 12. LOCK
- 13.
MOTOR 2 - 14. 100 RPM
Claims (5)
- Real-time monitoring system and flow-measurement of positive displacement pump(s), said pump(s) being equipped of at least one piston (9) and a respective discharge chamber (7) and a discharge valve (12) and at least one sensor (8) capable to detect the position of the piston (9) in at least one of the discharge chambers (7) and at least one sensor (6) capable to detect the exact closing/opening time of at least one of the discharge valves (12) by observation of the pressure of the respective discharge chamber(s) (7), versus the time, characterized in that the sensors signals coming from each one or from several of the pumps are sent to microcomputer units (3), that uses the derivative curve versus time (23) of the discharge valve (12) position curve versus time (22) obtained from the signal of the discharge chamber pressure sensor 6), to detect the opening and closing times of discharge valve (12), or uses to the same purpose the comparison between the signal from a discharge chamber pressure sensor (6) and that from a discharge circuit (10) pressure sensor, and can calculate the volumetric efficiency of the pump, each unit (3) is connected to a local monitoring unit (2) for use by the operator of the pumps, and units (2) are connected to a central display and monitoring unit (1).
- System according to claim 1, characterized in that the connection between the local monitoring units (2) and the central unit (1) is performed through a multipoint serial data bus.
- System according to claim 2, characterized in that the units (3) are connected to the local units (2) through a multipoint serial data bus.
- System according to anyone of claims 1 to 3, characterized in that it comprises a proximity sensor 8 (and adapter 19) for the detection of the end position(s) of the piston in a considered chamber.
- System according to claim 4, characterized in that the proximity sensor (8) signal and the pressure sensor (6) signal are analysed to provide the volumetric efficiency of the pump, then the volumetric efficiency value is used to accurately correct the theoretical flow rate of the pump in order to get the actual flow rate in the discharge line.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8614088 | 1986-10-08 | ||
FR8614088A FR2605059B1 (en) | 1986-10-08 | 1986-10-08 | FLOW MEASUREMENT AND MONITORING SYSTEM FOR POSITIVE DISPLACEMENT PUMPS AND PUMPS PROVIDED WITH SUCH SYSTEMS |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0264148A1 EP0264148A1 (en) | 1988-04-20 |
EP0264148B1 true EP0264148B1 (en) | 1991-04-17 |
Family
ID=9339728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87201707A Expired - Lifetime EP0264148B1 (en) | 1986-10-08 | 1987-09-09 | Flow measurement and monitoring system for positive-displacement pumps and pumps equipped with 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 (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
WO2020048947A1 (en) * | 2018-09-06 | 2020-03-12 | Brinkmann Pumpen K.H. Brinkmann Gmbh & Co. Kg | A method for detecting leakage 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 |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU632759B2 (en) * | 1988-08-25 | 1993-01-14 | 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 |
US5109692A (en) * | 1988-08-25 | 1992-05-05 | Fisher Controls International Inc. | Diagnostic apparatus and method for fluid control valves |
US4976144A (en) * | 1988-08-25 | 1990-12-11 | Fisher Controls International, Inc. | Diagnostic apparatus and method for fluid control valves |
DE58909473D1 (en) * | 1988-08-26 | 1995-11-23 | Teves Gmbh Alfred | Method for monitoring a hydraulic brake system and brake system for performing 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 |
WO1992019867A1 (en) * | 1991-05-03 | 1992-11-12 | Hans Willi Meinz | Process and device for the controlled metering of at least one pourable component |
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 |
TWI402423B (en) * | 2006-02-28 | 2013-07-21 | Entegris Inc | System and method for operation of a 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 |
CN106414282B (en) | 2014-05-15 | 2018-12-18 | 诺信公司 | Dense phase pump diagnosis |
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 |
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 |
Citations (2)
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 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 CN CN 87106757 patent/CN1021129C/en not_active Expired - Fee Related
- 1987-10-07 JP JP25176187A patent/JPS63105291A/en active Pending
- 1987-10-07 NO NO874201A patent/NO874201L/en unknown
- 1987-10-07 BR BR8705330A patent/BR8705330A/en unknown
Patent Citations (2)
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 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
WO2020048947A1 (en) * | 2018-09-06 | 2020-03-12 | Brinkmann Pumpen K.H. Brinkmann Gmbh & Co. Kg | A method for detecting leakage 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 |
Also Published As
Publication number | Publication date |
---|---|
FR2605059B1 (en) | 1991-02-08 |
CN87106757A (en) | 1988-08-10 |
JPS63105291A (en) | 1988-05-10 |
CN1021129C (en) | 1993-06-09 |
NO874201L (en) | 1988-04-11 |
SU1556547A3 (en) | 1990-04-07 |
FR2605059A1 (en) | 1988-04-15 |
BR8705330A (en) | 1988-05-24 |
DE3769429D1 (en) | 1991-05-23 |
EP0264148A1 (en) | 1988-04-20 |
NO874201D0 (en) | 1987-10-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0264148B1 (en) | Flow measurement and monitoring system for positive-displacement pumps and pumps equipped with this system | |
AU752463B2 (en) | Fuel delivery system | |
US5056017A (en) | System to monitor fuel level in a tank, and fuel dispensed from the tank, to determine fuel leakage and theft losses | |
RU2395433C2 (en) | Method of operating aircraft, method of fuel amount indication, computer system for calculation of fuel amount, aircraft fuel tank assembly and fuel amount processor control element | |
US6817252B2 (en) | Piston position measuring device | |
EP2893301B1 (en) | Self-diagnosing differential pressure flow meter | |
EP0619874B1 (en) | Apparatus for determining emptying characteristics | |
US6536271B1 (en) | Pump with integral flow monitoring | |
US9841015B2 (en) | Arrangement and method for measuring a delivery volume and a delivery rate of an intermittently operating pump | |
CN107976223A (en) | A kind of high accuracy leakage amount detector | |
AU2016304406B2 (en) | Supervised proportional metering device and methods for monitoring a metering pump | |
US4649734A (en) | Apparatus and method for calibrating a flow meter | |
US11029181B2 (en) | Vortex flowmeter with flow instability detection | |
KR101810232B1 (en) | Flow sensor for booster pump and booster pump system real-time sensing malfunction | |
CN213808033U (en) | Metering pump performance testing device with flow calibration function | |
JP2980640B2 (en) | Flow measurement device | |
CA2350859C (en) | Apparatus for generating and conducting a fluid flow, and method of monitoring said apparatus | |
JP2520501Y2 (en) | Abnormality detection and damage prevention device for hydraulic pump or motor | |
JP2001330491A (en) | Gas meter and gas use monitor system | |
CN210375568U (en) | Gas flow detection device | |
ZA200601983B (en) | Method and apparatus for determining the approximate flow rate of a fluid through a pump | |
KR102520395B1 (en) | Measuring device for liquid flow | |
CN210862858U (en) | Flowmeter quality testing device | |
JP2010077931A (en) | Device for flow rate measuring inspection of inspection object and method for inspection by flow rate measurement of inspection object | |
RU2019799C1 (en) | Device for inspecting air-tightness of articles |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE GB IT NL |
|
17P | Request for examination filed |
Effective date: 19880912 |
|
17Q | First examination report despatched |
Effective date: 19890130 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
ITF | It: translation for a ep patent filed |
Owner name: DOTT. FRANCO CICOGNA |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE GB IT NL |
|
REF | Corresponds to: |
Ref document number: 3769429 Country of ref document: DE Date of ref document: 19910523 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19960930 Year of fee payment: 10 Ref country code: DE Payment date: 19960930 Year of fee payment: 10 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980401 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19980401 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980603 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20010912 Year of fee payment: 15 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020909 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20020909 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050909 |