GB2026704A - Device for Measuring Fluid Flow in Tubing - Google Patents

Device for Measuring Fluid Flow in Tubing Download PDF

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Publication number
GB2026704A
GB2026704A GB7924820A GB7924820A GB2026704A GB 2026704 A GB2026704 A GB 2026704A GB 7924820 A GB7924820 A GB 7924820A GB 7924820 A GB7924820 A GB 7924820A GB 2026704 A GB2026704 A GB 2026704A
Authority
GB
United Kingdom
Prior art keywords
orifice
flow
section
cross
tubing
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.)
Granted
Application number
GB7924820A
Other versions
GB2026704B (en
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.)
Alstom SA
Original Assignee
Alsthom Atlantique SA
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 Alsthom Atlantique SA filed Critical Alsthom Atlantique SA
Publication of GB2026704A publication Critical patent/GB2026704A/en
Application granted granted Critical
Publication of GB2026704B publication Critical patent/GB2026704B/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/22—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by variable-area meters, e.g. rotameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/363—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction with electrical or electro-mechanical indication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • G01F1/42—Orifices or nozzles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/50—Correcting or compensating means

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Flow Control (AREA)

Abstract

A device for measuring the flow rate of a fluid travelling along tubing comprises a flow orifice (40, 50) of continuously variable cross-section formed by a multiple orifice valve (2), a servo-mechanism (60) connected to vary the cross-section of the said flow orifice by means of a moving component (5), a unit (6) sensitive to the loss of head caused by the flow orifice, and calculating means (9) for calculating the flow rate as a function of the said head loss and the cross- section of the said orifice, the servo- mechanism being arranged to keep the head loss within a predetermined range. The cross-section of the orifice is monitored by a cursor (71) attached to the moving component (5) and co- operating with a position sensor (8). <IMAGE>

Description

SPECIFICATION Device for Measuring Fluid Flow in Tubing The present invention relates to a device for measuring the flow rate of a fiuidtravelling under pressure in tubing.
Usually, the flow rate through tubing is measured by means of apparatus including a head loss unit, e.g. of the diaphragm type, i.e. having a predetermined fixed flow cross-section.
A major drawback with this type of apparatus lies in its small dynamic range. For exampie, if the flow should drop from 1 to 0.1 the head loss would pass from 1 to 0.01 which generally tends to make low flow rate measurements inaccurate.
Indeed, supposing that a particular tube conveys a flow rate that may vary from a maximum rate OM to a minimum rate Qm, a minimum head loss, AP1, must be created to obtain an adequate measurement taking into account the sensitivity of the instruments, the fluctuations in flow rate and the Reynolds number of the flow. There is a maximum tolerable head loss, AP2. Generally speaking, the difference between API and AP2 is small. It is thus only possible to use apparatus of the head-loss type if means are provided to maintain the pressure in the rangeAPi,AP2.
This drawback can be mitigated by using different diaphragms for different flow rates, the diaphragms being placed in an arrangement for facilitating selection of the most appropriate diaphragm, but this makes for a complex and bulky assembly.
Preferred embodiments of the present invention provide a measuring device adequately adapted to measure all rates of flow to be expected in a particular situation.
The present invention provides a device for measuring the flow rate of a fluid travellling along tubing, the device comprising a flow orifice of continuously variable cross-section, a servomechanism connected to vary the cross-section of the said flow orifice by means of a moving component, a unit sensitive to the loss of head caused by the flow orifice, and calculating means for calculating the flow rate as a function of the said head loss and the cross-section of the said orifice, the servo-mechanism being arranged to keep the head loss within a predetermined range and the orifice of variable cross-section being provided by a multiple orifice valve. The head loss may be maintained substantially constant.
The unit sensitive to the head loss may comprise a differential pressure sensor arranged across the variable section orifice, and the unit sensitive to the flow cross-section to the orifice may comprise a cursor fixed to move with the moving component. The calculating means may be electronic.
An embodiment of the invention is described by way of example with reference to the sole figure of the accompanying drawing which is a diagrammatic view of a device for measuring liquid flow through tubing under the control of a multiple orifice valve.
In the figure, the reference 1 designates as a whole tubing for fluid flowing in the direction of the arrow F situated between a length of upstream tubing 11 and a- length of downstream tubing 12. A multiple orifice valve 2 analogous to that described in French patent application nO 76 17956 published under the nO 2355237 is disposed between the flange 1 3 of the upstream length and the flange 14 of the downstream length.
The valve 2 comprises an annular body 3 having an annular recess 20 in which a fixed plate 4 and a moving plate 5 are disposed. The moving plate 5 is controlled by a motor unit of conventional type and not shown. The fixed plate 4 comprises a set of orifices 40 of identical crosssection and the moving plate 5 also comprises a set of orifices 50 of identical cross-section.
Depending the position of the moving plate 5, the orifices 50 of the fixed plate 4 may face solid parts of the moving plate 5, which corresponds to the valve being totally closed, or else they may be partially uncovered by adjacent orifices 40, or eise they may be in coincidence with the orifices 40, which corresponds to the fully opened position of the valve.
The flow of liquid in the tubing causes a head loss proportional to the square of the flow, but also inversely proportional to a function of the free flow cross-section offered by the orifices as a result of the greater or lesser coincidence of each of the orifices 40 with a corresponding orifice 50.
Under these conditions, the head loss obtained makes it possible to measure over a very wide dynamic range with fair accuracy.
The head loss is detected by a sensor 6 connected to an upstream tapping 61 and a downstream tapping 62 disposed on either side of the flow orifices of the valve.
Indeed, the degree of opening of the valve may be obtained satisfactorily provided it is free from play and vibrations.
As a function of a head loss measured between the orifices 40 and 50, the sensor 6 controls a servo-mechanism 60 which continuously varies the free cross-section of the orifices 40 and 50 by moving a controlled rod 7 in such a manner as to maintain the head loss substantially constant and predetermined and lying in the previously defined range AP1, AP2.
The end of the rod 7 that is connected to the moving plate 5 and which moves therewith, includes a cursor 71 cooperating with a position sensor 8.
The sensors 6 and 8 thus transmit data concerning the loss of head across the orifices 40 and 50 of the valve and the position of the valve to calculation means 9.
The function of the calculation means 9 is to translate the position of the valve into an effective free-flow cross-section of the orifices and then to calculate the flow rate as a function of this flow section and of the head loss. The result is then displayed on a display 90 attached to the calculation means 9.

Claims (6)

Claims
1. A device for measuring the flow rate of a fluid travelling along tubing, the device comprising a flow orifice of continuously variable cross-section, a servo-mechanism connected to vary the cross-section of the said flow orifice by means of a moving component, a unit sensitive to the loss of head caused by the flow orifice, and calculating means for calculating the flow rate as a function of the said head loss and the crosssection of the said orifice, the servo-mechanism being arranged to keep the head loss within a predetermined range and the orifice of variable cross-section being provided by a multiple orifice valve.
2. A device according to claim 1, wherein the multiple orifice valve is a valve controlling the flow in the tubing.
3. A device according to claim 1 or 2, wherein the unit sensitive to head loss comprises a differential pressure sensor arranged about the variable section orifice.
4. A device according to claim 1,2 or 3, wherein the flow cross-section of the orifice is sensed by a sensor operated by a cursor moving with the moving component.
5. A device according to any preceding claim, wherein the calculating means is electronic.
6. A device for measuring the flow rate of a fluid travelling along tubing, substantially as herein described with reference to the accompanying drawing.
GB7924820A 1978-07-27 1979-07-17 Device for measuring fluid flow in tubing Expired GB2026704B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7822258A FR2432160A1 (en) 1978-07-27 1978-07-27 DEVICE FOR MEASURING THE FLOW OF A PIPELINE

Publications (2)

Publication Number Publication Date
GB2026704A true GB2026704A (en) 1980-02-06
GB2026704B GB2026704B (en) 1982-11-10

Family

ID=9211255

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7924820A Expired GB2026704B (en) 1978-07-27 1979-07-17 Device for measuring fluid flow in tubing

Country Status (9)

Country Link
JP (1) JPS6015001B2 (en)
BE (1) BE877571A (en)
DE (1) DE2929471A1 (en)
ES (1) ES482911A1 (en)
FR (1) FR2432160A1 (en)
GB (1) GB2026704B (en)
GR (1) GR69642B (en)
IT (1) IT1118918B (en)
MA (1) MA18531A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025576A2 (en) * 1979-09-14 1981-03-25 Giuseppe Torresin Turbulence conveyor flowmeter for medical use
EP0086259A2 (en) * 1981-11-13 1983-08-24 Hamilton Bonaduz AG Process and device to determine a gas flow
US4581707A (en) * 1980-05-30 1986-04-08 John Millar (U.K.) Limited Microprocessor controlled valve flow indicators
EP0223300A2 (en) * 1985-11-20 1987-05-27 EMS Holland BV Gas meter
FR2594541A1 (en) * 1986-02-14 1987-08-21 Air Liquide METHOD FOR CONTROLLING THE FLOW RATE IN A VALVE AND APPARATUS FOR IMPLEMENTING SAID METHOD
US4801245A (en) * 1986-05-02 1989-01-31 Borsig Gmbh Method of damping surges in recirpocating compressors
US4918994A (en) * 1987-05-21 1990-04-24 Ems Holland B.V. Gas meter
EP0392271A1 (en) * 1989-04-03 1990-10-17 Landis & Gyr Business Support AG Measuring device for fluid flow and/or quantities of heat
EP0392272A1 (en) * 1989-04-03 1990-10-17 Landis &amp; Gyr Technology Innovation AG Measuring and/or controlling device for fluid flow and/or quantities of heat
US5016468A (en) * 1988-04-06 1991-05-21 T. A. Jennings Associates, Inc. Method and apparatus for the determination of moisture in materials
EP0565485A1 (en) * 1992-04-08 1993-10-13 EMILE EGGER &amp; CO. AG Method and device to measure the flow of a medium and application of the method
NL1003973C2 (en) * 1996-09-06 1998-03-09 Berkin Bv Method for instantaneous identification of a gas or liquid flow and device for carrying out the method.
GB2497321A (en) * 2011-12-06 2013-06-12 Senico Ltd Multi-phase metering of fluid flows

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5992313A (en) * 1982-11-18 1984-05-28 Kansai Electric Power Co Inc:The Flow rate detector
JPS6138517U (en) * 1984-08-10 1986-03-11 株式会社 武藤電機 flow measuring device
JPS6197721U (en) * 1985-12-04 1986-06-23
JPS6329210Y2 (en) * 1986-05-15 1988-08-05
JPH02297023A (en) * 1989-05-11 1990-12-07 Kubota Konpusu Kk Water distribution controller
JPH0349101U (en) * 1989-09-22 1991-05-13
CN106052774A (en) * 2016-06-21 2016-10-26 成都国光电子仪表有限责任公司 Differential pressure type flow meter
CN106123975A (en) * 2016-06-21 2016-11-16 成都国光电子仪表有限责任公司 A kind of multi-functional effusion meter of nozzle-type
CN106153129A (en) * 2016-06-21 2016-11-23 成都国光电子仪表有限责任公司 Natural gas flowmeter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE869421C (en) * 1951-12-25 1953-03-05 Bopp & Reuther Gmbh Adjustable throttle measuring device with segment aperture
DE1295254B (en) * 1958-03-03 1969-05-14 Sulzer Ag Arrangement for controlling the amount of medium flowing through a line with a throttle element per unit of time
FR1340463A (en) * 1962-11-21 1963-10-18 Siemens Ag Device for regulating a flow
US3640307A (en) * 1970-02-24 1972-02-08 Allied Thermal Corp Apparatus for balancing fluid distribution systems
FR2355237A1 (en) * 1976-06-14 1978-01-13 Alsthom Cgee ORGAN WITH ADJUSTABLE PRESSURE DROP

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025576A2 (en) * 1979-09-14 1981-03-25 Giuseppe Torresin Turbulence conveyor flowmeter for medical use
EP0025576A3 (en) * 1979-09-14 1983-04-13 Giuseppe Torresin Turbulence conveyor flowmeter for medical use
US4581707A (en) * 1980-05-30 1986-04-08 John Millar (U.K.) Limited Microprocessor controlled valve flow indicators
EP0086259A2 (en) * 1981-11-13 1983-08-24 Hamilton Bonaduz AG Process and device to determine a gas flow
EP0086259A3 (en) * 1981-11-13 1985-06-12 Hamilton Bonaduz AG Process and device to determine a gas flow
EP0223300A2 (en) * 1985-11-20 1987-05-27 EMS Holland BV Gas meter
EP0223300A3 (en) * 1985-11-20 1988-05-18 EMS Holland BV Gas meter
FR2594541A1 (en) * 1986-02-14 1987-08-21 Air Liquide METHOD FOR CONTROLLING THE FLOW RATE IN A VALVE AND APPARATUS FOR IMPLEMENTING SAID METHOD
EP0237390A1 (en) * 1986-02-14 1987-09-16 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method for controlling fluid flow through a valve and apparatus for carrying out this method
US4763681A (en) * 1986-02-14 1988-08-16 L'air Liquide Process for controlling the flow of a fluid in a valve and apparatus for carrying out said process
US4801245A (en) * 1986-05-02 1989-01-31 Borsig Gmbh Method of damping surges in recirpocating compressors
US4918994A (en) * 1987-05-21 1990-04-24 Ems Holland B.V. Gas meter
US5016468A (en) * 1988-04-06 1991-05-21 T. A. Jennings Associates, Inc. Method and apparatus for the determination of moisture in materials
EP0392271A1 (en) * 1989-04-03 1990-10-17 Landis & Gyr Business Support AG Measuring device for fluid flow and/or quantities of heat
EP0392272A1 (en) * 1989-04-03 1990-10-17 Landis &amp; Gyr Technology Innovation AG Measuring and/or controlling device for fluid flow and/or quantities of heat
US5125753A (en) * 1989-04-03 1992-06-30 Landis & Gyr Betriebs Ag Device to measure flow-through and/or quantity of heat
EP0565485A1 (en) * 1992-04-08 1993-10-13 EMILE EGGER &amp; CO. AG Method and device to measure the flow of a medium and application of the method
US5987981A (en) * 1996-06-09 1999-11-23 Berkin B.V. Method for momentarily identifying a gas or liquid flow, and device for carry out the method
NL1003973C2 (en) * 1996-09-06 1998-03-09 Berkin Bv Method for instantaneous identification of a gas or liquid flow and device for carrying out the method.
EP0829793A1 (en) * 1996-09-06 1998-03-18 Berkin B.V. Method for momentarily identifying a gas or liquid flow, and device for carrying out the method
GB2497321A (en) * 2011-12-06 2013-06-12 Senico Ltd Multi-phase metering of fluid flows
GB2497321B (en) * 2011-12-06 2014-06-18 Senico Ltd Multi-phase metering of fluid flows
US9671793B2 (en) 2011-12-06 2017-06-06 Senico Limited Multi-phase metering of fluid flows

Also Published As

Publication number Publication date
JPS6015001B2 (en) 1985-04-17
GR69642B (en) 1982-07-06
ES482911A1 (en) 1980-04-16
FR2432160B1 (en) 1982-04-02
JPS5522188A (en) 1980-02-16
IT1118918B (en) 1986-03-03
BE877571A (en) 1980-01-09
FR2432160A1 (en) 1980-02-22
GB2026704B (en) 1982-11-10
IT7968557A0 (en) 1979-07-26
DE2929471A1 (en) 1980-02-07
MA18531A1 (en) 1980-04-01

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee