EP0264148B1 - Système de mesure de débit et de surveillance pour pompes à déplacement positif et pompes munies de ce système - Google Patents

Système de mesure de débit et de surveillance pour pompes à déplacement positif et pompes munies de ce système Download PDF

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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
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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
Application number
EP87201707A
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German (de)
English (en)
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EP0264148A1 (fr
Inventor
Paul Dancer
Jean Moncharmont
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.)
PUMPTECH NV
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PUMPTECH NV
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Publication of EP0264148A1 publication Critical patent/EP0264148A1/fr
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Publication of EP0264148B1 publication Critical patent/EP0264148B1/fr
Anticipated expiration legal-status Critical
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    • 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

Definitions

  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 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.
  • 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 two triplex pumps 4, a quintuplex pump 5 and then to two triplex pumps 4 again.
  • the use of a multipoint serial data bus between parts 1 and 2 simplifies the addition or removal of a particular equipment item.
  • a similar bus is used between parts 2 and 3, allowing for connection of other sensors in series with microcomputer 3, plus the use of a single line to local monitoring unit 2.
  • the number of pressure sensors 6 connected to microcomputer 3 is equal to the sum of the number of discharge chambers 7 of pumps 4 or 5 to which microcomputer 3 is connected.
  • the number of proximity sensors 8 is equal to the number of pumps 4 or 5 connected. In other words, there must be a pressure sensor 6 for each discharge chamber 7 and a proximity sensor 8 per pump 4 or 5.
  • 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.
  • a ring B
  • the nature of the reference will be selected to suit the sensor; the preferred example would be a steel ring detected by an inductive 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 4 or 5.
  • discharge chamber 7 is filled by the alternating action of slide 9, and then evacuated into discharge circuit 10.
  • the direction of fluid flow is established by valve 11, known as the suction valve, and valve 12, known as the discharge valve. Movement of valves 11 and 12 is determined by the action of suction valve spring 13 and discharge valve spring 14, and by the forces exerted by the moving fluid and the pressures in discharge circuit 10, the discharge chamber and suction circuit 15.
  • the preferred configuration is with pressure sensor 6 mounted on the inner side of flap P to chamber 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 into suction circuit 15 until suction anti-return valve 11 closes, cutting off the fluid flow.
  • discharge valve 12 opens and the fluid is expelled into the discharge circuit.
  • the volume of fluid delivered into discharge circuit 10 is equal to the volume displaced by slide 9 as the latter advances into chamber 7 from the position it occupied at the moment discharge valve l2 opened, up to its stationary position corresponding to maximum penetration into chamber 7.
  • FIG. 3 is a block diagram of a microcomputer unit.
  • Item 15 is a microprocessor system with its clock, bus and memories.
  • a safeguarded memory 16 provides for storage of a certain quantity of data, in particular the calibration values of pumps 4 and 5 which are connected to the microcomputer. These values allow in particular for the calculation of the volumes displaced by slide 9 betweem its stationary position and its position at the moments of opening and closing of discharge valve 12.
  • Items 17 are connecting parts providing links with the multipoint serial bus.
  • pressure sensors 6 are connected to microcomputer 15 via adapters 18.
  • proximity detectors 8 are connected to microprocessor system 15 by adapters 19. Items 6, 18, and 19 are sufficient in number to provide for a pressure sensor 6 and an adapter 18 per discharge chamber 7, and for a proximity detector 8 and an adapter 19 per pump 4 or 5.
  • FIG. 4 shows three curves plotted against time.
  • Curve 21 shows the variations in the output signal from a discharge sensor which measures the position of discharge 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 that valve 12 is moving away from its seat. The fluid then begins to be discharged into the discharge circuit 10.
  • Curve 22 represents the signal from a sensor 6 placed in discharge chamber 7 corresponding to discharge valve 12 whose position is observed.
  • Curve 23 is the derivative in relation to time, of curve 22.
  • Part of the Invention consists in using a pressure 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 of valve 12 inside the pump, whereas a pressure sensor has no moving parts and resists the pressures created by the pumps.
  • pressure sensor 6 gives more information on the operational state of the pump than would a movement sensor measuring the movement of discharge valve 12.
  • the highest point of curve 23 corresponds to the exact moment of opening of valve 12: this is used in the software of microcomputer 3 to determine the moment of opening of valve 12 from the form of the signal representing the pressure in the chamber.
  • the moment of closing of discharge 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 a pressure sensor 6 in discharge 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 in discharge circuit 10, discharge valve 12 will be closed.
  • volumetric efficiency of the pump takes 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 given microcomputer 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 24 and 25 from the pressure sensors 6 in two discharge chambers 7.
  • the pressure sensor 6 whose signal is represented by curve 24 is located in a discharge chamber 7 whose discharge valve 12 is in good working order.
  • the pressure sensor 6 whose signal is represented by curve 25 is in a discharge chamber 7 whose discharge 12 is defective so that there is a leak from discharge circuit 10 to discharge chamber 7 when discharge valve 12 is at rest on its seat.
  • the pressure in discharge circuit 10 is greater than the pressure in suction circuit 15.
  • the vertical lines represent the moments when the respective discharge chamber slides 9 are stationary.
  • curve 24 shows that the pressure in discharge chamber 7 does not increase before immobilising of slide 9, the pressure in discharge chamber 7 with a faulty discharge valve 12 does increase before the slide stops.
  • 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) :
  • 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.

Claims (5)

  1. Système de mesure de débit et de surveillance pour pompe(s) à déplacement positif, la(les)dite(s) pompe(s) étant équipée(s) d'au moins un piston (9) et d'une chambre de refoulement correspondante (7), d'un clapet de refoulement (12) et d'au moins un capteur (8) capable de détecter la position du piston (9) dans au moins une des chambres (7) de refoulement et d'au moins un capteur (6) capable de détecter l'instant exact de fermeture/ouverture d'au moins un des clapets de refoulement (12) en observant la pression de la ou des chambre(s) (7) de refoulement correspondante(s) en fonction du temps, caractérisé en ce que les signaux des capteurs venant de chacune ou de plusieurs des pompes sont envoyés à des unités à micro-ordinateur (3), qui utilisent la courbe de la dérivée en fonction du temps (23) de la courbe en fonction du temps (22) de la position du clapet de refoulement (12) déduite du signal du capteur de pression (6) de la chambre de refoulement, pour détecter les instants de fermeture ou d'ouverture du clapet de refoulement (12), ou qui utilisent dans le même but la comparaison entre le signal délivré par un capteur de pression (6) d'une chambre de refoulement et celui d'un capteur de pression (10) d'un circuit de refoulement, et qui peuvent calculer le rendement volumétrique de la pompe, en ce que chaque unité (3) est reliée à une unité locale de surveillance (2) utilisable par l'opérateur des pompes, et en ce que les unités (2) sont reliées à une unité centrale (1) de visualisation et de surveillance.
  2. Système selon la revendication 1, caractérisé en ce que la liaison entre les unités locales de surveillance (2) et l'unité centrale est assurée par un bus de données série multipoint.
  3. Système selon la revendication 2, caractérisé en ce que les unités (3) sont connectées aux unités locales (2) par un bus de données série multipoint.
  4. Système selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il comporte un capteur de proximité (8) (et un adaptateurs 19) pour détecter la(les) position(s) finale(s) du piston dans une chambre considérée.
  5. Système selon la revendication 4, caractérisé en ce que le signal du capteur de proximité (8) et le signal du capteur de pression (6) sont analysés dans le but d'établir le rendement volumétrique de la pompe, puis la valeur du rendement volumétrique utilisée pour corriger précisément le débit théorique de la pompe afin d'obtenir le débit réel dans la conduite de refoulement.
EP87201707A 1986-10-08 1987-09-09 Système de mesure de débit et de surveillance pour pompes à déplacement positif et pompes munies de ce système Expired - Lifetime EP0264148B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8614088 1986-10-08
FR8614088A FR2605059B1 (fr) 1986-10-08 1986-10-08 Systeme de mesure de debit et de surveillance pour pompes a deplacement positif et pompes munies de ces systemes

Publications (2)

Publication Number Publication Date
EP0264148A1 EP0264148A1 (fr) 1988-04-20
EP0264148B1 true EP0264148B1 (fr) 1991-04-17

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EP87201707A Expired - Lifetime EP0264148B1 (fr) 1986-10-08 1987-09-09 Système de mesure de débit et de surveillance pour pompes à déplacement positif et pompes munies de ce système

Country Status (8)

Country Link
EP (1) EP0264148B1 (fr)
JP (1) JPS63105291A (fr)
CN (1) CN1021129C (fr)
BR (1) BR8705330A (fr)
DE (1) DE3769429D1 (fr)
FR (1) FR2605059B1 (fr)
NO (1) NO874201L (fr)
SU (1) SU1556547A3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4209679A1 (de) * 1992-03-25 1993-12-16 Schwing Gmbh F Dickstoffpumpe
WO2020048947A1 (fr) * 2018-09-06 2020-03-12 Brinkmann Pumpen K.H. Brinkmann Gmbh & Co. Kg Procédé de détection de fuite dans une pompe volumétrique
DE102020127285B3 (de) 2020-10-16 2022-01-20 K.H. Brinkmann GmbH & Co Kommanditgesellschaft Verfahren zur Feststellung von Leckagen einer Verdrängerpumpe

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US4976144A (en) * 1988-08-25 1990-12-11 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
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
WO1990002066A1 (fr) * 1988-08-26 1990-03-08 Alfred Teves Gmbh Procede pour controler le fonctionnement ou la capacite fonctionnelle d'un dispositif, d'une installation ou de composants de celle-ci
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 (de) * 1990-12-20 1992-06-25 Krupp Maschinentechnik Messeinrichtung zur erfassung charakteristischer kenngroessen, welche die arbeitsweise hydraulischer aggregate erkennbar machen
JPH04311685A (ja) * 1991-04-10 1992-11-04 Sanden Corp 圧縮機
WO1992019867A1 (fr) * 1991-05-03 1992-11-12 Hans Willi Meinz Procede et dispositif pour le dosage controle d'au moins un composant coulant
EP0751446B1 (fr) * 1996-09-28 2003-12-10 Maag Pump Systems Textron AG Méthode et dispositif de surveillance d'unités d'un système
ITMI20022642A1 (it) * 2002-12-16 2004-06-17 Nuovo Pignone Spa Metodo e sistema per monitorare un compressore alternativo.
DE102005005940B4 (de) * 2005-02-10 2006-12-14 Sauer-Danfoss Aps Vorrichtung und Verfahren zur Ermittlung von Parametern einer Hydromaschine
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 (zh) * 2006-02-28 2013-07-21 Entegris Inc 用於一幫浦操作之系統及方法
US20080040052A1 (en) * 2006-08-11 2008-02-14 Toshimichi Wago Pump Monitor
CN101782061A (zh) * 2010-03-14 2010-07-21 苏州工业园区华西泵业有限公司 一种纺丝泵试验台
US8757986B2 (en) * 2011-07-18 2014-06-24 Schlumberger Technology Corporation Adaptive pump control for positive displacement pump failure modes
EP3495292B1 (fr) * 2014-05-15 2020-10-07 Nordson Corporation Diagnostic de pompe à phase dense
CN105928585B (zh) * 2016-04-15 2019-02-19 徐州徐工施维英机械有限公司 输送缸输送量计量方法和计量装置以及输送系统
US10378537B2 (en) 2016-10-06 2019-08-13 Caterpillar Inc. System for detecting failure location in a pump
CN106996850A (zh) * 2017-03-30 2017-08-01 杭州石林自动化工程有限公司 一种活塞压力计全自动压力源
CN107939661A (zh) * 2017-12-04 2018-04-20 西南石油大学 一种压裂泵液力端工作参数实时监控系统
CN108303243A (zh) * 2018-01-31 2018-07-20 嘉兴林众电子科技有限公司 微量泵流量测试系统
CN108757425A (zh) * 2018-05-16 2018-11-06 四川宏华电气有限责任公司 一种压裂泵健康状态监视系统及方法
CN115506762A (zh) * 2021-06-03 2022-12-23 中国石油天然气集团有限公司 压裂泵液力端故障检测方法及其检测装置

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US3779457A (en) * 1971-06-28 1973-12-18 Trw Inc Data normalizing method and system
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
DE4209679A1 (de) * 1992-03-25 1993-12-16 Schwing Gmbh F Dickstoffpumpe
WO2020048947A1 (fr) * 2018-09-06 2020-03-12 Brinkmann Pumpen K.H. Brinkmann Gmbh & Co. Kg Procédé de détection de fuite dans une pompe volumétrique
DE102020127285B3 (de) 2020-10-16 2022-01-20 K.H. Brinkmann GmbH & Co Kommanditgesellschaft Verfahren zur Feststellung von Leckagen einer Verdrängerpumpe

Also Published As

Publication number Publication date
NO874201L (no) 1988-04-11
NO874201D0 (no) 1987-10-07
FR2605059A1 (fr) 1988-04-15
CN1021129C (zh) 1993-06-09
CN87106757A (zh) 1988-08-10
JPS63105291A (ja) 1988-05-10
FR2605059B1 (fr) 1991-02-08
EP0264148A1 (fr) 1988-04-20
DE3769429D1 (de) 1991-05-23
SU1556547A3 (ru) 1990-04-07
BR8705330A (pt) 1988-05-24

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