WO2001067052A1 - Compensation de la densite pour un volume d'ecoulement mesure au moyen d'un debitmetre massique a effet de coriolis - Google Patents

Compensation de la densite pour un volume d'ecoulement mesure au moyen d'un debitmetre massique a effet de coriolis Download PDF

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Publication number
WO2001067052A1
WO2001067052A1 PCT/US2001/002438 US0102438W WO0167052A1 WO 2001067052 A1 WO2001067052 A1 WO 2001067052A1 US 0102438 W US0102438 W US 0102438W WO 0167052 A1 WO0167052 A1 WO 0167052A1
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WO
WIPO (PCT)
Prior art keywords
flow rate
set forth
mass flowmeter
mass
density
Prior art date
Application number
PCT/US2001/002438
Other languages
English (en)
Inventor
Michael Joseph Keilty
Jonathan Charles Hall
Roger Vanzandt Kovacs
Original Assignee
Micro Motion, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Micro Motion, Inc. filed Critical Micro Motion, Inc.
Priority to AU3295701A priority Critical patent/AU3295701A/xx
Publication of WO2001067052A1 publication Critical patent/WO2001067052A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters

Definitions

  • the present invention pertains to the field of tanker trucks and trailers that are used in the transportation of liquids, gasses, and slurries to remote locations. More particularly, the tanker trucks are provided with improved metering devices that measure the amount of materials delivered to points of sale at the remote locations.
  • the term 'bobtail truck' means a vehicle including a truck chassis, a motor, and a tank that is used to transport materials.
  • Approximately 36,000 bobtail trucks operate on United States highways and in airports to deliver various fuels. These trucks are preferred in many instances for their relative stability and ease of handling relative to tanker trailers.
  • a sale or custodial transfer typically occurs whenever fuels are offloaded from these trucks or trailers.
  • positive displacement metering devices are installed to measure volumes of materials that are offloaded from these trucks.
  • LPG liquid petroleum gas
  • propane Propane results from the process of refining crude oil, as well as the processing of natural gas. Propane and other forms of LPG are often stored underground in salt domes, anticlines, and other geologic formations until they are needed.
  • Bobtail trucks are used to transport the LPG to remote points of use, e.g., to rural houses having propane tanks where the propane is used for heating, automotive propane fueling stations, or to neighborhood distribution points for filling propane tanks that are used in residential barbeques and the like.
  • Propane is preferred because it becomes liquid at low pressures, which are typically less than 150 psia. Unfractionated natural gas may also be used in these devices, but natural gas requires storage at significantly greater pressures which can result in catastrophic failure of metal storage vessels.
  • Conventional positive displacement meters are insensitive to changes in pressure and temperature that affect measurement accuracy relative to standard conditions, e.g., at 60°F and 150 psia for propane.
  • Conventional positive displacement meters can measure a volume of displaced liquid, but there is insufficient information available to convert the volume to a standard volume, i.e., a corresponding volume at standard pressure and temperature conditions.
  • Positive displacement meters often break or fail under field conditions.
  • propane is a notoriously poor lubricant
  • the positive displacement meters that are used to deliver propane simply wear out quickly as a consequence of poor lubrication in the intended environment of use. Particles in the materials being delivered can jam the moving parts of positive displacement meters, which then demonstrate measurement error.
  • the positive displacement meters are insensitive to changes in pressure, temperature, and fluid density in the materials being delivered. These conditions combine to provide an unacceptably high meter uncertainty in the field.
  • Mass flow meters are not often used in these applications, in part, because they have not yet obtained the requisite regulatory approvals. Another reason why mass flow meters have not been used in this intended environment of use is the fact that they measure mass, as opposed to volume, where the sales must take place in terms of volume.
  • Some types of mass flow meters, especially Coriolis flow meters are capable of being operated in a manner that performs a direct measurement of density, and volume is obtainable as the quotient of mass over density. See, e.g., US 4,872,351 to Ruesch assigned to Micro Motion for a net oil computer that uses a Coriolis flowmeter to measure the density of an unknown multiphase fluid.
  • US 5,687,100 to Buttler et al. teaches a Coriolis effect densitometer that corrects the density readings for mass flow rate effects in a mass flowmeter operating as a vibrating tube densitometer.
  • Coriolis effect mass flowmeters measure mass flow and other information for materials flowing through a conduit. Such flowmeters are disclosed in U.S. Pat. Nos. 4,109,524 of August 29, 1978, 4,491 ,025 of January 1 , 1985, and Re. 31 ,450 of February 11 , 1982, all to J. E. Smith et al. Coriolis flowmeters have one or more flow tubes of straight or curved configuration. Information regarding the characteristics of material flowing in a Coriolis mass flowmeter must be derived with great accuracy because it is often a requirement that the derived flow rate information have an error of less than 0.15% of reading.
  • Coriolis flowmeter output signals are sinusoidal and are displaced in time or phase by an amount determined by the Coriolis forces that are generated by the flowmeter through which the material flows.
  • the signal processing circuitry which receives these sensor output signals measures this time difference with precision and generates the desired characteristics of the flowing process material to the required error of less than 0.15% of reading.
  • a perceived problem with using mass flow meters to provide volumetric flow rates is the additional requirement of measuring density together with the corresponding increase in meter uncertainty that arises from making two direct measurements to derive the same volumetric measurement.
  • calibration is defined to mean a flow measurement test that provides data which is used to either improve the accuracy of a flowmeter or to verify the accuracy of a flowmeter. Improvement of flowmeter accuracy is most often done by changing a flow calibration factor for the meter.
  • flowmeter is defined to mean any meter having the ability to measure intrinsic or extrinsic fluid properties when placed in a service location where the fluid is normally flowing. Flowmeters include densitometers and viscosimeters, as well as mass flow rate and volumetric flow rate meters.
  • volumetric rate flowmeters are preferred for use in systems according to the present invention, and mass rate flowmeters are especially preferred.
  • the term "uncertainty" means a quantifiable combination of random and systematic measurement uncertainties that are determined according to any convention that is accepted in the metering art, at least including international standards such as ISO-5168.
  • the present invention overcomes the problems outlined above by providing a more durable and inherently accurate metering device in the form of a Coriolis flowmeter. Applicants have discovered that the Coriolis flowmeter can withstand the rigors of roadable use and do not wear out in the manor of prior meters. Use of Coriolis effect mass flowmeters, as described hereinbelow, results in more information, less maintenance, and greater accuracy.
  • a mass flowmeter system is used to dispense measured volumes of compressible liquids, gasses, and the like.
  • a mass flowmeter is operably coupled with a CPU in the form of meter electronics, a controller or any other computational device.
  • the computational device converts mass flow rate measurements to volume through the use of a direct density measurement or a density correlation value for the fluid understudy.
  • the computational device (or other system electronics) also corrects this volume to standard conditions selected from the group consisting of standard pressure, standard temperature, and combinations thereof.
  • the mass flowmeter system thus described is advantageously capable of providing improved uncertainty at least ten percent better than any commercially available positive displacement meter for flow rates in the range from ten gallons per minute to 200 gallons per minute.
  • volumetric correction to standard conditions is particularly advantageous and represents a capability to achieve an entirely new and improved level of volumetric accuracy. This improved accuracy is especially important in sales of these products.
  • a particularly preferred manner of correcting these volumes is to use a three dimensional correlation simultaneously relating pressure, temperature, and density. Third order least squares correlations of this type demonstrate exceptional reliability with a fit of at least 1.5 X 10 "14 respecting empirical data that underlies the correlation.
  • the flowmeter system is especially well adapted for use on bobtail trucks and tanker trailers that include, in further combination with the flowmeter system, a vehicle chassis, motive means operably coupled with the vehicle chassis for use of the vehicle chassis on roadways, and a tank transport of material which is dispensed through the mass flowmeter.
  • An especially preferred feature of the invention is the provision of a mechanism for self calibrating the mass flowmeter at remote locations to guard against the effects of road-induced vibrations.
  • a tank having a known volume can be drained through the mass flowmeter to adjust the meter calibration factor or factors. Calibration can also be performed using a standard fluid having a known density and a known mass.
  • aspects of the invention include a mass flow metering system for use in accurately and reliably dispensing measured volumes of compressible liquids, gasses, and the like to remote locations, comprising: a mass flowmeter; and means operably coupled with the mass flowmeter for converting mass measurements obtained from the flowmeter to volume and for correcting volume to standard conditions selected from the group consisting of standard pressure, standard temperature, and combinations thereof; the mass flowmeter being capable of providing improved uncertainty at least ten percent better than a positive displacement meter for flow in the range from ten gallons per minute to 200 gallons per minute; the means for correcting volume including means for providing a standard volume of a liquified petroleum gas product based upon readings from the mass flowmeter; the means for correcting volume including a three dimensional correlation simultaneously relating pressure, temperature, and density; the three dimensional correlation is a least squares correlation having an order of at least three and a fit of at least 1.5 X 10 "14 with respect to empirical data supporting the correlation; the mass flowmeter system further including a vehicle chassis,
  • additional aspects of the invention include a method of operating a mass flowmeter for use in accurately and reliably dispensing measured volumes of compressible liquids, gasses, and the like to remote locations, the method comprising the steps of: measuring a mass flow rate of a fluid to provide a mass flow rate measurement, converting the mass flow rate measurement to a volumetric flow rate, and correcting the volumetric flow rate to a flow rate at a standard condition selected from the group consisting of standard pressure, standard temperature, and combinations thereof; the step of correcting the volumetric flow rate yields a corrected value having improved uncertainty at least ten percent better than any commercially available positive displacement meter for flow in the range from ten gallons per minute to two hundred gallons per minute; the step of correcting the volumetric flow rate includes correcting for values associated with a liquified petroleum gas product based upon readings from the mass flowmeter; the step of correcting the volumetric flow rate includes using a three dimensional correlation simultaneously relating pressure, temperature, and density; the three dimensional correlation is a
  • FIG. 1 depicts the use of a mobile delivery system according to the present invention in use transporting fuel between a fuel storage facility and a plurality of remote locations;
  • FIG. 2 is a schematic diagram of a mass flowmeter system according to the invention.
  • FIG.3 provides temperature dependent volume correction factors for LPG; and FIG.4 provides a three dimensional correlation for pressure, temperature, and density.
  • FIG. 1 depicts a bobtail truck 100 that is used to transport fuel, e.g., propane, between an underground storage facility 102 and a plurality of remote locations including propane tanks 104 and 106.
  • the bobtail truck includes a conventional vehicle chassis together with a conventional drive mechanism (not shown in FIG. 1 ) including a motor and a transmission making the chassis usable for the transport of fuel on road 110.
  • a pressurized tank 112 is mounted to the chassis 108, as are a rolled hose assembly 114 and a Coriolis flow metering system 116.
  • FIG. 1 represents an intended environment of use for flow metering system 116.
  • the underground storage facility 102 places LPG 118 in a geologic trapping structure 120, which is penetrated by a wellbore 122.
  • a wellhead 124 is configured to provide LPG to a conventional LPG shipping facilityl 26, which is used to fill bobtail truck 100.
  • FIG.2 is s schematic diagram representing flow metering system 116 in greater detail.
  • a Coriolis effect mass flowmeter 200 is installed in a line 202 connecting tank 112 with rolled hose assembly 114.
  • Pressure transmitter 204 and a temperature gauge 206 are installed in line 202 proximate mass flowmeter 200, as is a pump 208 for drawing liquid propane from tank 112.
  • the pressure transmitter is an optional device because pressure of the propane in tank 112 may be calculated or deduced based upon the measured density of propane.
  • the temperature gauge is a preferred feature of the invention because it permits correction of volume for temperature effects.
  • the meter electronics 210 are conventional meter electronics that are used to operate flowmeter 200 as a mass flowmeter and as a vibrating tube densitometer.
  • One of meter electronics 210 and/or any other computational device, e.g., a controller 212, is programmed to convert the mass flow rate measurements from mass flowmeter 200 into volume. This conversion is accomplished by dividing the mass flow rate by a substantially contemporaneous density measurement or a density that is derived from a correlation based upon pressure and temperature measurements from the pressure transmitter 204 and temperature gauge 206.
  • One of meter electronics 210 and/or any other computational device, e.g., controller 212, is also programmed to correct the volumetric flow rate calculations to conditions of standard pressure and temperature. This correction is performed using empirically derived data from actual samples of compressible liquids.
  • FIG. 3 is a table of volume reduction factors for use in calculating a reduction in volume to 60°F from the indicated temperature of LPG for LPG having a range of specific gravities from 0.500 to 0.510. These values are related to isobaric coefficients of thermal expansion at 150 psi.
  • a prover tank 214 is used to hold a known quantity of a standard fluid 216, which is released through a manual valve 218 to calibrate mass flow meter 200 on site if meter diagnostics in controller 212 or meter electronics 210 indicate a need for calibration.
  • FIGS. 1 and 2 are intended to illustrate preferred embodiments of the invention and, consequently, are not intended to limit the invention.
  • the system components that are shown in FIG. 2 may be combined with mass flowmeter 200 or maintained as separate components.
  • the meter electronics 210 may be integrated with controller 212 and vice-versa, or processing functions may be reallocated among the respective components.
  • the system components of the flow pathway in line 202 may be arranged in any sequential order. Any type of fluid density or volume correction factor correlation may be used to correct for density.
  • An especially preferred feature of the invention is the use of a three dimensional correlation that uses observed temperature and pressure measurements to solve for the density of propane or another LPG. A measured density is then compared to the density value that is calculated from the correlation to calculate a meter calibration factor for use in onsite calibration of the density calibration factor.
  • a meter calibration factor for use in onsite calibration of the density calibration factor.
  • propane most actual measurements are made at 150 psi, which approximates the pressure at which liquid propane is stored for commercial and residential use.
  • this three dimensional correlation or a lookup table based upon this correlation can be entered or reformulated to calculate temperature and/or pressure.
  • FIG. 4 demonstrates a third order least squares fit taken from PVT data for propane. The coefficient of fit is extremely good and has a value of 1.4822 X 10 "14 .

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Details Of Flowmeters (AREA)

Abstract

La présente invention concerne un débitmètre massique à effet de Coriolis (200) couplé à la logique d'un compteur (210) et/ou à un contrôleur (212) de façon à permettre la conversion en débit volumétrique du débit massique, avec correction aux conditions normales de température et de pression. Le système de compteur de l'invention convient particulièrement dans le cas des camions et remorques à citernes servant à la livraison de combustibles et carburants sous la forme de liquides compressibles tels que le gaz de pétrole liquéfié.
PCT/US2001/002438 2000-03-07 2001-01-25 Compensation de la densite pour un volume d'ecoulement mesure au moyen d'un debitmetre massique a effet de coriolis WO2001067052A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU3295701A AU3295701A (en) 2000-03-07 2001-01-25 Density compensation for volume flow measured with a coriolis mass flow meter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52064200A 2000-03-07 2000-03-07
US09/520,642 2000-03-07

Publications (1)

Publication Number Publication Date
WO2001067052A1 true WO2001067052A1 (fr) 2001-09-13

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10210061A1 (de) * 2002-03-08 2003-10-09 Flowtec Ag Coriolis-Massedurchflußmesser zur Konzentrationsmessung
WO2004029559A1 (fr) * 2002-09-26 2004-04-08 Micro Motion, Inc. Gestion de propane par debitmetre masse de type coriolis
WO2006043799A1 (fr) * 2004-10-18 2006-04-27 Jorge Cortes Garcia Distributeur de gaz liquefie de petrole ameliore comprenant un mesureur de flux de masse par effet de coriolis
US7614273B2 (en) 2003-09-29 2009-11-10 Micro Motion, Inc. Method for detecting corrosion, erosion or product buildup on vibrating element densitometers and Coriolis flowmeters and calibration validation
AU2004325253B2 (en) * 2004-11-30 2010-07-22 Micro Motion, Inc. Method and apparatus for determining flow pressure using density information
WO2014056709A1 (fr) 2012-10-11 2014-04-17 Endress+Hauser Flowtec Ag Système de mesure pour déterminer un débit volumique et/ou un pourcentage de débit volumique d'un fluide s'écoulant dans une tuyauterie
DE102012109729A1 (de) 2012-10-12 2014-05-15 Endress + Hauser Flowtec Ag Meßsystem zum Ermitteln eines Volumendruchflusses und/oder einer Volumendurchflußrate eines in einer Rohrleitung strömenden Mediums
US9475687B2 (en) 2008-06-03 2016-10-25 Gilbarco Inc. Dispensing equipment utilizing coriolis flow meters
CN110793584A (zh) * 2019-11-13 2020-02-14 四川奥达测控装置有限公司 一种多相流质量流量测量系统与测量方法
WO2020120048A1 (fr) * 2018-12-11 2020-06-18 Endress+Hauser Flowtec Ag Procédé pour surveiller l'état d'un capteur de mesure
US10921174B2 (en) 2017-05-25 2021-02-16 Endress+Hauser Group Services Ag Hydrocarbon transfer standard certified to provide in situ calibration of measuring devices

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Publication number Priority date Publication date Assignee Title
US3588481A (en) * 1969-05-01 1971-06-28 Daniel Ind Inc Digital multiplying circuit
US4238825A (en) * 1978-10-02 1980-12-09 Dresser Industries, Inc. Equivalent standard volume correction systems for gas meters
EP0074164A1 (fr) * 1981-07-22 1983-03-16 EUROMATIC MACHINE & OIL CO. LIMITED Appareil de distribution de gaz
WO1995030196A1 (fr) * 1994-04-29 1995-11-09 Electronic Warfare Associates, Inc. Systeme de mesure et de commande de liquides pourvu de modules fonctionnels en reseau
EP0828142A2 (fr) * 1996-09-04 1998-03-11 Emerson Electric Co. Préamplificateur intelligent pour débitmètre

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3588481A (en) * 1969-05-01 1971-06-28 Daniel Ind Inc Digital multiplying circuit
US4238825A (en) * 1978-10-02 1980-12-09 Dresser Industries, Inc. Equivalent standard volume correction systems for gas meters
EP0074164A1 (fr) * 1981-07-22 1983-03-16 EUROMATIC MACHINE & OIL CO. LIMITED Appareil de distribution de gaz
WO1995030196A1 (fr) * 1994-04-29 1995-11-09 Electronic Warfare Associates, Inc. Systeme de mesure et de commande de liquides pourvu de modules fonctionnels en reseau
EP0828142A2 (fr) * 1996-09-04 1998-03-11 Emerson Electric Co. Préamplificateur intelligent pour débitmètre

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7188035B2 (en) 2002-03-08 2007-03-06 Endress + Hauser Flowtec Ag Coriolis mass flow meter for measuring a concentration
DE10210061A1 (de) * 2002-03-08 2003-10-09 Flowtec Ag Coriolis-Massedurchflußmesser zur Konzentrationsmessung
JP4822708B2 (ja) * 2002-09-26 2011-11-24 マイクロ・モーション・インコーポレーテッド コリオリ流量計を用いたプロパン測定
WO2004029559A1 (fr) * 2002-09-26 2004-04-08 Micro Motion, Inc. Gestion de propane par debitmetre masse de type coriolis
JP2006500586A (ja) * 2002-09-26 2006-01-05 マイクロ・モーション・インコーポレーテッド コリオリ流量計を用いたプロパン測定
CN100380102C (zh) * 2002-09-26 2008-04-09 微动公司 利用科里奥利流量计的丙烷测量
AU2003263940B2 (en) * 2002-09-26 2009-02-26 Micro Motion, Inc. Propane measurement using a Coriolis flowmeter
US7614273B2 (en) 2003-09-29 2009-11-10 Micro Motion, Inc. Method for detecting corrosion, erosion or product buildup on vibrating element densitometers and Coriolis flowmeters and calibration validation
US7827844B2 (en) 2003-09-29 2010-11-09 Micro Motion, Inc. Method for detecting corrosion, erosion or product buildup on vibrating element densitometers and Coriolis flowmeters and calibration validation
WO2006043799A1 (fr) * 2004-10-18 2006-04-27 Jorge Cortes Garcia Distributeur de gaz liquefie de petrole ameliore comprenant un mesureur de flux de masse par effet de coriolis
AU2004325253B2 (en) * 2004-11-30 2010-07-22 Micro Motion, Inc. Method and apparatus for determining flow pressure using density information
US9475687B2 (en) 2008-06-03 2016-10-25 Gilbarco Inc. Dispensing equipment utilizing coriolis flow meters
WO2014056709A1 (fr) 2012-10-11 2014-04-17 Endress+Hauser Flowtec Ag Système de mesure pour déterminer un débit volumique et/ou un pourcentage de débit volumique d'un fluide s'écoulant dans une tuyauterie
EP4016013A1 (fr) 2012-10-11 2022-06-22 Endress + Hauser Flowtec AG Système de mesure permettant de déterminer un écoulement volumique et/ou un débit volumique d'un milieu s'écoulant dans une conduite
DE102012109729A1 (de) 2012-10-12 2014-05-15 Endress + Hauser Flowtec Ag Meßsystem zum Ermitteln eines Volumendruchflusses und/oder einer Volumendurchflußrate eines in einer Rohrleitung strömenden Mediums
US10921174B2 (en) 2017-05-25 2021-02-16 Endress+Hauser Group Services Ag Hydrocarbon transfer standard certified to provide in situ calibration of measuring devices
WO2020120048A1 (fr) * 2018-12-11 2020-06-18 Endress+Hauser Flowtec Ag Procédé pour surveiller l'état d'un capteur de mesure
CN110793584A (zh) * 2019-11-13 2020-02-14 四川奥达测控装置有限公司 一种多相流质量流量测量系统与测量方法

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AR027561A1 (es) 2003-04-02
AU3295701A (en) 2001-09-17

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