CA2481869A1 - Averaging orifice primary flow element - Google Patents
Averaging orifice primary flow element Download PDFInfo
- Publication number
- CA2481869A1 CA2481869A1 CA002481869A CA2481869A CA2481869A1 CA 2481869 A1 CA2481869 A1 CA 2481869A1 CA 002481869 A CA002481869 A CA 002481869A CA 2481869 A CA2481869 A CA 2481869A CA 2481869 A1 CA2481869 A1 CA 2481869A1
- Authority
- CA
- Canada
- Prior art keywords
- disposed
- conduit
- fluid
- apertures
- flow
- 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
Links
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
- G01F1/34—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
- G01F1/46—Pitot tubes
-
- 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
-
- 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
Abstract
A process flow device that includes a self-averaging orifice plate type of primary flow element (2) for measuring, by a differential pressure process, the volumetric rate of fluid flow at a point in a fluid carrying conduit (8) where the velocity profile (7) of the fluid is asymmetric with respect to the longitudinal axis of the conduit. The improved flow element comprises a planar flow-impeding plate (2) disposed transversely across the interior of the conduit (8) and perpendicular to the longitudinal axis thereof. The plate includes at least three circular apertures (22) eccentrically disposed with respect to the longitudinal axis of the conduit to create static pressure averaging on the downstream side of the plate. Upstream and downstream static pressure sensing ports are respectively provided on opposite sides of the flow impeding plate.
Description
AVERAGING ORIFICE PRIMARY FLOW ELEMENT
FIELD OF THE INVENTION
[0001] The present invention relates generally to a process flow device that includes a self-averaging orifice plate type of primary flow element for measuring, by a differential pressure process, the volumetric rate of fluid flow at a point in a fluid carrying conduit where the velocity profile of the fluid is asymmetric with respect to the longitudinal axis of the conduit.
ACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
[0001] The present invention relates generally to a process flow device that includes a self-averaging orifice plate type of primary flow element for measuring, by a differential pressure process, the volumetric rate of fluid flow at a point in a fluid carrying conduit where the velocity profile of the fluid is asymmetric with respect to the longitudinal axis of the conduit.
ACKGROUND OF THE INVENTION
[0002] Orifice plate flow meters having a single centered opening in a plate constriction that is disposed diametrically within a fluid-carrying pipe, with differential pressure measurement means on the upstream and downstream sides of the constriction, have been in existence for a long period of time. While the accuracy of such devices is good for long runs of pipe, orifice plate flow meters suffer the disadvantage of poor performance when placed in short pipe runs that follow a flow disturbance created by upstream apparatus, such as an elbow, expander, reducer, valve or other discontinuity. For measurement accuracy with an orifice plate flow meter, a long straight run of pipe (in excess of ten diameters in some instances) upstream of the flow meter is required in order to present a fully developed symmetrical velocity profile to the orifice plate, with the highest fluid velocity occurring coaxially with the center of the orifice plate constriction. When an upstream pipe fitting or other device skews the velocity profile, the pressures measured at the orifice flow meter pressure taps is in error.
[0003] To reduce the asymmetry of the velocity profile created by an upstream fitting, the commonly used apparatus is a flow straightener, of the type disclosed in U.S. Patent No. 5,596,152 or apparatus similar to the flow conditioner described in U.S. Patent No.
3, 733, 898. A more complex apparatus, employing a plurality of elongated openings arranged in a predetermined pattern in a transversely disposed plate within the fluid-conducting pipe, together with a computer to deal with the necessary algorithms, is disclosed in U.S. Patent No. 5,295,397. Yet another device for reducing the adverse measuring effects of a distorted velocity profile is known as the piezometer ring. This appliance may surround the orifice on both sides of the orifice plate and, by means of a plurality of circumferentially disposed pressure sensing ports, averages pressures around the upstream and downstream sides of the orifice. Although not shown with an orifice plate flow meter, a piezometer type of averaging sensor is described generally in U.S. Patent No. 5,279,155.
3, 733, 898. A more complex apparatus, employing a plurality of elongated openings arranged in a predetermined pattern in a transversely disposed plate within the fluid-conducting pipe, together with a computer to deal with the necessary algorithms, is disclosed in U.S. Patent No. 5,295,397. Yet another device for reducing the adverse measuring effects of a distorted velocity profile is known as the piezometer ring. This appliance may surround the orifice on both sides of the orifice plate and, by means of a plurality of circumferentially disposed pressure sensing ports, averages pressures around the upstream and downstream sides of the orifice. Although not shown with an orifice plate flow meter, a piezometer type of averaging sensor is described generally in U.S. Patent No. 5,279,155.
[0004] Flow straighteners, conditioners, computers and piezometers are moderately effective to properly condition the velocity profile for introduction to an orifice plate flowmeter, or average the asymmetric velocity of the flow, but have the disadvantage of adding separate and additional components to the process piping with the attendant initial cost, pressure drop in the fluid, and increased maintenance requirements.
00005] Accordingly, the primary object of the present invention is to provide a primary flow element that achieves the accuracy benefits of the orifice plate type of flow meter, but is not restricted to long runs of upstream piping prior to the flow meter's positioning in the pipe.
[0006] A corresponding objective of the invention is to provide a.
primary flow element where the means for interrupting the fluid flow is a differential pressure orifice plate that achieves an averaging of the differential pressures across the plate, despite velocity profile distortion of the fluid presented to the primary flow element, and without the added piezometer and its computer, flow straightening or flow conditioning apparatus.
primary flow element where the means for interrupting the fluid flow is a differential pressure orifice plate that achieves an averaging of the differential pressures across the plate, despite velocity profile distortion of the fluid presented to the primary flow element, and without the added piezometer and its computer, flow straightening or flow conditioning apparatus.
[0007] Other and further objects, features and advantages of the invention will become apparent from the following description of embodiments of the invention, taken in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
SUMMARY OF THE INVENTION
[0008] The successful operation of traditional orifice plate flow meters is based on Bernoulli's theorem which states that along any one streamline in a moving fluid, the total energy per unit mass is constant, being made up of the potential energy, the pressure energy and the kinetic energy of the fluid. Thus, when fluid passes through the orifice in a constricting pipe plate, the velocity of the fluid through the orifice increases. This increase in fluid velocity causes the dynamic pressure of the fluid immediately downstream of the orifice plate to increase, while simultaneously decreasing the static pressure of the fluid at that same point. By sensing the static pressure on the upstream and downstream sides of the orifice plate, the decrease of static pressure on the downstream side results in a measurement of the pressure differential, dP, between the upstream side of the orifice plate and the downstream side. The rate of fluid flow q is proportional to dP . As earlier stated, prior art orifice plate flow meters work well when the velocity profile is symmetrical about the longitudinal axis of the pipe in which the fluid is flowing. In such a case, the highest velocity fluid is along the central axis of the pipe, coaxial with the orifice of the constricting pipe plate. When traveling through the orifice, the highest velocity fluid is the fluid that produces the pressure differential across the plate to provide the flow rate result.
[0009] However, if the velocity profile is skewed a lower velocity fluid will pass through the orifice and the downstream static pressure will be a reflecfiion of that lower velocity fluid. The differential pressure thus produced across the constricting plate will not be a true indication of the rate of fluid flow.
[0010] According to the present invention, a constrictive plate, or flow impedance device, having a plurality of variously positioned orifices is placed in a fluid-carrying conduit with static pressure measurement taken on the upstream and downstream sides of the plate. Each of the plurality of orifices will conduct a part of the total fluid flow within the conduit. According to Bernoulli's theorem, the velocity of the fluid through each of the orifices will increase, and the static fluid pressure on the downstream side of the constricting plate that is attributable to each of the separate orifices will be averaged within the fluid to provide an average downstream static pressure. The average downstream static pressure is compared with the upstream static pressure to provide an average differential pressure for whatever velocity profile is presented to the multiple orifice plate, resulting in an accurate measurement of the rate of fluid flow in the pipe.
[0011 ] Integrally incorporating the multiple orifice plate into the central opening of an annular ring with intermediate upstream and downstream static pressure measuring ports disposed within the ring, provides added simplicity to the primary flow element. This simplicity is further enhanced when the annular ring is provided with a projecting stem that is capable of conducting the sensed differential pressure to other flow processing accessories mounted on the stem.
DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a perspective exploded view of an averaging orifice primary flow element of the present invention positioned between two opposing mounting flanges fixed to the ends of a fluid carrying conduit. Dashed lines indicate the connection of accessory flow processing devices with the upstream and downstream pressure ports disposed within the mounting flanges.
[0013] Figure 1 A is a fragmentary cross sectional view of the piping and primary flow element of Figure 1, illustrating a representative velocity profile of the fluid in the pipe that would exist shortly downstream of an elbow in the piping.
[0014] Figures 2, 2A and 2B are plan views of three different configurations of the averaging orifice primary flow element of the present invention. The views are taken from a position downstream of the orifice plate, looking upstream.
[0015] Figure 3 is a cross sectional view taken along lines 3-3 of Figure 2A.
[0016] Figure 4 is an enlarged fragmentary detail of a portion of Figure 3.
[0017] Figure 5 is a perspective view of the embodiment of the present invention wherein the averaging orifice primary flow element is integrally incorporated intermediate the ends of an annular mounting ring with a projecting pressure communicating stem that mounts a valve-carrying manifold.
[0018] Figure 6 is a fragmentary perspective view of the Figure 5 embodiment of the presenfi invention, as supported between opposing mounting flanges on the ends of a fluid carrying conduit.
[0019] Figure 7 is an exploded view of the assembly of Figure 6.
[0020] Figure 8 is a prospective view of a modified form of the annular mounting ring of Figure 5 wherein the annular ring supports a pitot tube type of primary flow element instead of the averaging orifice plate, as shown in Figure 5.
DETAILED DESCRIPTION
[0021] A simplified version of the present invention is shown in Figures 1 and 1 A. An averaging orifice primary flow element 2 is positioned between two opposing mounting flanges 4 and 6 fixed to the ends of a fluid-carrying conduit 8 just below an elbow 9 where the velocity profile 7 is skewed. Each of the mounting flanges contain a radially extending pressure sensing port 10 and 12 that communicate with the fluid flowing in the pipe and are respectively connected through conduits 14 and 16 to a valve manifold 18 and into a pressure transducer 19. An electrical signal that represents the sensed differential pressure between the ports 10 and 12 is transmitted by transmitter 20 to a processing unit (not shown).
[0022] The primary flow element 2, also shown in figure 2, comprises a circular plate having four apertures 22 symmetrically arranged around the center of the plate 2. The center of the flow element plate 2 is positioned coaxially with the longitudinal centerline of the pipe 8. The plate 2 is retained in place by the sandwiching pressure of flanges 4 and 6. As shown in Figures 3 and 4, the circumferential edges 24 of the apertures 22 on the downstream side of the flow element plate 2 are preferably, but not necessarily, chamfered in order to facilitate expansion of the fluid column that flows through each aperture.
[0023] Figures 2A and 2B illustrate additional embodiments of the primary flow element in which there are an increased plurality of apertures 22A and 22B clustered around the center of primary flow element plates 2A and 2B. While the invention will be described with respect to the four aperture embodiment of Figure 2, it is understood that four apertures in the primary flow element plate is only one of many possible configurations of apertures. One particular configuration and number of apertures may be more appropriate to a given fluid, fluid profile and piping characteristics than another. However, the principal of operation is the same, regardless of the number or location of apertures in the constricting plate. The number or configuration of apertures is not limited by the illustrations of Figures 2 through 2B.
[0024] It is seen from Figure 1 A that the velocity of the fluid approaching the upper pair of apertures 22 in the constricting plate 2 is less than the velocity of the fluid approaching the lower pair of apertures 22. These initial differences in fluid velocity will not only influence the static pressure sensed by the pressure port 10 on the upstream side of the plate 2, they will also impact the velocity of the fluid that passes through the respective pairs of apertures and accordingly, will affect the static fluid pressure sensed by the downstream port 12. Because the velocity of fluid through each of the apertures, or each pair of apertures, will be different, the static pressure on the downstream side of the plate 2 that is a function of the fluid velocity through each of the apertures will be averaged within the fluid and the downstream pressure port 12 will sense that averaged static pressure. With a plurality of apertures positioned around the center of the plate 2, such as, for example, the four apertures 22 shown in Figures 2 and 5, the static pressure will be averaged, even when the fluid profile is nonsymmetrical about two pipe axes, as it would be when the fluid is swirling.
[0025] A modified form of a four-aperture primary flow element plate 30 is shown in Figure 5, integrally formed with the annular ring, or wafer, 32 that is insertable between the flanges 34 and 36 attached to the ends of two sections of a fluid-carrying pipe 40. Upstream and downstream pressure sensing ports 35 and 37 are located on each side of the flow element plate 30, as seen in Figure 6. The pressure sensing ports 35 and 37 connect through conduits 39 and 41 in the stem 45 to conduits 46 and 47 in the manifold 18. The Figure 5 embodiment is also illustrated in Figures 6 and 7, illustrating the total flow meter assembly inserted between pipe sections that carry the fluid whose flow rate is to be measured.
[0026] The wafer 32 is an annular ring whose inside diameter corresponds to the inside diameter of the fluid-carrying pipe 40. The flow element plate 30 is positioned across the ring opening substantially equi-distant from each of the lateral sides of the wafer ring 32. The wafer is mounted between two gaskets 48 and 49 that interface with the pipe end flanges 34 and 36. A semi-circular positioning ring 50 functions to position and secure the wafer 32 in its proper place between the pipe flanges. Positioning of the wafer 32 is achieved by placing it into the cradle formed by the interior of the ring 50 and seating the shanks of the fastening bolts 55 into the outer grooves of the ring.
[0027] With the averaging orifice plate 30 being integrally constructed with the mounting ring wafer 32 and the conduit carrying stem 45 and with the transmitter mounting manifold 18 being directly attached to the stem 45, several important advantages are achieved.
Most importantly, the differential pressure generating mechanism, the pressure sensing ports, the manifold and the transmitter components are incorporated into a single unit that is easily insertable between the flanges of pipe sections. In addition, the differential pressure generating mechanism may comprise types of primary flow elements other than orifice plates. For example, as shown in Figure 8, an averaging pitot tube 70, such as that disclosed in U.S. Patent No.
6,321,166 B 1, may be diametrically disposed across the opening of the ring wafer 32, with its high and low pressure conducting conduits connected to the conduits 71 and 72 housed in the stem 45.
[0011 ] Integrally incorporating the multiple orifice plate into the central opening of an annular ring with intermediate upstream and downstream static pressure measuring ports disposed within the ring, provides added simplicity to the primary flow element. This simplicity is further enhanced when the annular ring is provided with a projecting stem that is capable of conducting the sensed differential pressure to other flow processing accessories mounted on the stem.
DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a perspective exploded view of an averaging orifice primary flow element of the present invention positioned between two opposing mounting flanges fixed to the ends of a fluid carrying conduit. Dashed lines indicate the connection of accessory flow processing devices with the upstream and downstream pressure ports disposed within the mounting flanges.
[0013] Figure 1 A is a fragmentary cross sectional view of the piping and primary flow element of Figure 1, illustrating a representative velocity profile of the fluid in the pipe that would exist shortly downstream of an elbow in the piping.
[0014] Figures 2, 2A and 2B are plan views of three different configurations of the averaging orifice primary flow element of the present invention. The views are taken from a position downstream of the orifice plate, looking upstream.
[0015] Figure 3 is a cross sectional view taken along lines 3-3 of Figure 2A.
[0016] Figure 4 is an enlarged fragmentary detail of a portion of Figure 3.
[0017] Figure 5 is a perspective view of the embodiment of the present invention wherein the averaging orifice primary flow element is integrally incorporated intermediate the ends of an annular mounting ring with a projecting pressure communicating stem that mounts a valve-carrying manifold.
[0018] Figure 6 is a fragmentary perspective view of the Figure 5 embodiment of the presenfi invention, as supported between opposing mounting flanges on the ends of a fluid carrying conduit.
[0019] Figure 7 is an exploded view of the assembly of Figure 6.
[0020] Figure 8 is a prospective view of a modified form of the annular mounting ring of Figure 5 wherein the annular ring supports a pitot tube type of primary flow element instead of the averaging orifice plate, as shown in Figure 5.
DETAILED DESCRIPTION
[0021] A simplified version of the present invention is shown in Figures 1 and 1 A. An averaging orifice primary flow element 2 is positioned between two opposing mounting flanges 4 and 6 fixed to the ends of a fluid-carrying conduit 8 just below an elbow 9 where the velocity profile 7 is skewed. Each of the mounting flanges contain a radially extending pressure sensing port 10 and 12 that communicate with the fluid flowing in the pipe and are respectively connected through conduits 14 and 16 to a valve manifold 18 and into a pressure transducer 19. An electrical signal that represents the sensed differential pressure between the ports 10 and 12 is transmitted by transmitter 20 to a processing unit (not shown).
[0022] The primary flow element 2, also shown in figure 2, comprises a circular plate having four apertures 22 symmetrically arranged around the center of the plate 2. The center of the flow element plate 2 is positioned coaxially with the longitudinal centerline of the pipe 8. The plate 2 is retained in place by the sandwiching pressure of flanges 4 and 6. As shown in Figures 3 and 4, the circumferential edges 24 of the apertures 22 on the downstream side of the flow element plate 2 are preferably, but not necessarily, chamfered in order to facilitate expansion of the fluid column that flows through each aperture.
[0023] Figures 2A and 2B illustrate additional embodiments of the primary flow element in which there are an increased plurality of apertures 22A and 22B clustered around the center of primary flow element plates 2A and 2B. While the invention will be described with respect to the four aperture embodiment of Figure 2, it is understood that four apertures in the primary flow element plate is only one of many possible configurations of apertures. One particular configuration and number of apertures may be more appropriate to a given fluid, fluid profile and piping characteristics than another. However, the principal of operation is the same, regardless of the number or location of apertures in the constricting plate. The number or configuration of apertures is not limited by the illustrations of Figures 2 through 2B.
[0024] It is seen from Figure 1 A that the velocity of the fluid approaching the upper pair of apertures 22 in the constricting plate 2 is less than the velocity of the fluid approaching the lower pair of apertures 22. These initial differences in fluid velocity will not only influence the static pressure sensed by the pressure port 10 on the upstream side of the plate 2, they will also impact the velocity of the fluid that passes through the respective pairs of apertures and accordingly, will affect the static fluid pressure sensed by the downstream port 12. Because the velocity of fluid through each of the apertures, or each pair of apertures, will be different, the static pressure on the downstream side of the plate 2 that is a function of the fluid velocity through each of the apertures will be averaged within the fluid and the downstream pressure port 12 will sense that averaged static pressure. With a plurality of apertures positioned around the center of the plate 2, such as, for example, the four apertures 22 shown in Figures 2 and 5, the static pressure will be averaged, even when the fluid profile is nonsymmetrical about two pipe axes, as it would be when the fluid is swirling.
[0025] A modified form of a four-aperture primary flow element plate 30 is shown in Figure 5, integrally formed with the annular ring, or wafer, 32 that is insertable between the flanges 34 and 36 attached to the ends of two sections of a fluid-carrying pipe 40. Upstream and downstream pressure sensing ports 35 and 37 are located on each side of the flow element plate 30, as seen in Figure 6. The pressure sensing ports 35 and 37 connect through conduits 39 and 41 in the stem 45 to conduits 46 and 47 in the manifold 18. The Figure 5 embodiment is also illustrated in Figures 6 and 7, illustrating the total flow meter assembly inserted between pipe sections that carry the fluid whose flow rate is to be measured.
[0026] The wafer 32 is an annular ring whose inside diameter corresponds to the inside diameter of the fluid-carrying pipe 40. The flow element plate 30 is positioned across the ring opening substantially equi-distant from each of the lateral sides of the wafer ring 32. The wafer is mounted between two gaskets 48 and 49 that interface with the pipe end flanges 34 and 36. A semi-circular positioning ring 50 functions to position and secure the wafer 32 in its proper place between the pipe flanges. Positioning of the wafer 32 is achieved by placing it into the cradle formed by the interior of the ring 50 and seating the shanks of the fastening bolts 55 into the outer grooves of the ring.
[0027] With the averaging orifice plate 30 being integrally constructed with the mounting ring wafer 32 and the conduit carrying stem 45 and with the transmitter mounting manifold 18 being directly attached to the stem 45, several important advantages are achieved.
Most importantly, the differential pressure generating mechanism, the pressure sensing ports, the manifold and the transmitter components are incorporated into a single unit that is easily insertable between the flanges of pipe sections. In addition, the differential pressure generating mechanism may comprise types of primary flow elements other than orifice plates. For example, as shown in Figure 8, an averaging pitot tube 70, such as that disclosed in U.S. Patent No.
6,321,166 B 1, may be diametrically disposed across the opening of the ring wafer 32, with its high and low pressure conducting conduits connected to the conduits 71 and 72 housed in the stem 45.
Claims (20)
1. An averaging differential pressure primary flow measuring element for insertion between sections of a fluid carrying conduit, comprising, first and second annular mounting flanges having circumferential outside surfaces and interior openings that correspond in shape and size to the inside cross section of the conduit, planer flow impedance means having a center point, said means being disposed between the first and second annular mounting flanges, where the center point is coaxial with the longitudinal axes of the interior openings of the flanges, and said means having a plurality of circular apertures eccentrically disposed with respect to the center point of the impedance means.
2. The apparatus of claim 1 where the flow impedance means is a flat plate.
3. The apparatus of claim 2 where the first and second annular mounting flanges are integrally formed as a single annular ring having flat parallel sides and where the flat plate is disposed transversely across the interior opening in the ring and parallel to the sides of the ring.
4. The apparatus of claim 1 and further including, first and second pressure conducting bores radially disposed in the first and second flanges for establishing fluid communication between the respective interior openings in the flanges and the circumferential outside surfaces of the flanges.
5. The apparatus of claim 3 and further including, first and second pressure conducting bores radially disposed in the annular ring on opposite sides of the flat plate.
6. The apparatus of claim 5 and further including, an elongated mounting stem radially extending from the circumferential outside surface of the annular ring and having first and second conduits longitudinally therethrough that communicate with the respective first and second pressure conducting bores.
7. The apparatus of claim 1 where the circular apertures have opposing circumferential edges, one of which is beveled.
8. An averaging differential pressure flow meter for determining the volumetric rate of fluid flow in a circular conduit, comprising, an annulus where the central opening corresponds in shape and size to the inside cross section of the circular conduit, a disk, congruent with the central opening, and having a center point, said disk being disposed within the central opening coincident with a plane that is perpendicular to the longitudinal axis of the central opening, said disk having a plurality of circular apertures eccentrically disposed with respect to the center point of the disk.
9. The apparatus of claim 8 and further including, a supporting arm extending radially from the annulus, said arm including first and second interiorly disposed fluid transporting conduits that extend into the annulus, and first and second pressure sensing ports communicating with the interior opening of the annulus on respective opposite sides of the disk.
10. The apparatus of claim 9 where the plurality of circular apertures is four, comprising first and second pairs of apertures that are bilaterally disposed with respect to the disk center point, and where a line connecting the centers of the apertures defines a square.
11. The apparatus of claim 9 where the plurality of circular apertures is three, said three apertures being disposed in a triangular pattern around the center point of the disk.
12. The apparatus of claim 9 where the plurality of circular apertures is five, comprising a comprising first and second pairs of apertures that are bilaterally disposed with respect to the disk center point and a single aperture spaced from the center point of the disk and where a line connecting the centers of the apertures defines a pentagon.
13. The apparatus of claim 9 where the plurality of circular apertures is six, said apertures being spaced apart from the center point of the disk and where a line connecting the centers of the apertures defines a hexagon.
14. The apparatus of claim 8 where the circular apertures have opposing circumferential edges, one of which is beveled.
15. The apparatus of claim 9 where the circular apertures have opposing circumferential edges, one of which is beveled.
16. A differential pressure flow meter for determining the volumetric rate of fluid flow in a circular conduit, comprising, an annulus having, a circumferential outside surface, a central opening that corresponds in shape and size to the inside cross section of the circular conduit, and a pitot tube having upstream and downstream facing surfaces, said tube being disposed within and diametrically across the central opening.
17. The combination of claim 16 where the pitot-static tube includes, at least one total pressure port in the upstream facing surface, at least one suction pressure port in the downstream facing surface, and total and ssuction pressure plenums within the tube connected in fluid communication respectively to the total and static pressure ports.
18. The combination of claim 17 and further including, first and second bores radially disposed in the annulus, respectively connected in fluid communication with the total and static pressure plenums.
19. The combination of claim 18 and further including, a supporting arm extending radially from the annulus, said arm including first and second interiorly disposed fluid transporting conduits that extend into the annulus and connect in fluid communication with the first and second bores in the annulus.
20. An averaging orifice plate fluid flow meter for measuring the volumetric rate of fluid flow in a conduit, comprising, a conduit for carrying fluid from an upstream to a downstream location, planar flow impedance means disposed transversely across the interior of the conduit, at least three circular apertures in the impedance means eccentrically disposed with respect to the longitudinal axis of the conduit, first static pressure sensing means disposed within the conduit upstream of the flow impedance means and proximate thereto, and second static pressure sending means disposed with the conduit downstream of the flow impedance means and proximate thereto.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/119,283 | 2002-04-09 | ||
US10/119,283 US7284450B2 (en) | 2002-04-09 | 2002-04-09 | Averaging orifice primary flow element |
PCT/US2003/005464 WO2003087734A1 (en) | 2002-04-09 | 2003-02-21 | Averaging orifice primary flow element |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2481869A1 true CA2481869A1 (en) | 2003-10-23 |
CA2481869C CA2481869C (en) | 2014-05-20 |
Family
ID=28674562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2481869A Expired - Lifetime CA2481869C (en) | 2002-04-09 | 2003-02-21 | Averaging orifice primary flow element |
Country Status (11)
Country | Link |
---|---|
US (2) | US7284450B2 (en) |
EP (1) | EP1493001A4 (en) |
JP (1) | JP2005522686A (en) |
KR (2) | KR20040097292A (en) |
CN (1) | CN1646885A (en) |
AU (1) | AU2003213244A1 (en) |
CA (1) | CA2481869C (en) |
MX (1) | MXPA04009470A (en) |
RU (1) | RU2004132863A (en) |
WO (1) | WO2003087734A1 (en) |
ZA (1) | ZA200408017B (en) |
Families Citing this family (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2391278A (en) * | 2002-07-30 | 2004-02-04 | David Williams | Pipe Coupling |
US7798017B2 (en) * | 2005-07-14 | 2010-09-21 | Systec Controls Mess-Und Regelungstechnik Gmbh | Ram pressure probe having two ducts and a differential pressure increasing element |
US20080011821A1 (en) * | 2006-07-10 | 2008-01-17 | Daniel Measurement And Control, Inc. | Method and System of Determining Orifice Plate Parameters |
US9062994B2 (en) * | 2007-06-15 | 2015-06-23 | Dieterich Standard, Inc. | Locating of pressure taps on face of orifice plate device |
US7461563B1 (en) * | 2007-09-07 | 2008-12-09 | Daniel Measurement And Control, Inc. | Bi-directional orifice plate assembly |
DE102007061146A1 (en) * | 2007-12-17 | 2009-06-18 | Miele & Cie. Kg | Method for evaluating a particle signal and suction nozzle for a vacuum cleaner |
US7654154B2 (en) * | 2008-03-21 | 2010-02-02 | Dieterich Standard, Inc. | Conditioning orifice plate with pipe wall passages |
US8082860B2 (en) * | 2008-04-30 | 2011-12-27 | Babcock Power Services Inc. | Anti-roping device for pulverized coal burners |
US8104412B2 (en) * | 2008-08-21 | 2012-01-31 | Riley Power Inc. | Deflector device for coal piping systems |
KR100915089B1 (en) * | 2009-01-23 | 2009-09-02 | 주식회사 하이트롤 | Valve device unified with cone-type venturi for flow measurement |
JP2011013152A (en) * | 2009-07-03 | 2011-01-20 | Miyamoto Kogyosho Co Ltd | Method and circuit for measuring flow rate of regenerative burner |
CN101865754B (en) * | 2010-07-20 | 2012-11-21 | 哈尔滨工业大学 | Method for detecting gas tightness of composite material laminated plate |
US8429983B2 (en) * | 2010-08-26 | 2013-04-30 | General Electric Company | Insertion type flow measuring device for measuring characteristics of a flow within a pipe |
LU91808B1 (en) * | 2011-04-15 | 2012-10-16 | Ipalco Bv | System for delivering pre-conditioned air to an aircraft on the ground |
US9032815B2 (en) * | 2011-10-05 | 2015-05-19 | Saudi Arabian Oil Company | Pulsating flow meter having a bluff body and an orifice plate to produce a pulsating flow |
US8684023B2 (en) | 2011-10-19 | 2014-04-01 | Dieterich Standard, Inc. | Roddable direct mount manifold for primary flow element |
US8739638B1 (en) * | 2011-11-22 | 2014-06-03 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Star-shaped fluid flow tool for use in making differential measurements |
US9228866B2 (en) * | 2012-06-06 | 2016-01-05 | Dieterich Standard, Inc. | Process fluid flow transmitter with finned coplanar process fluid flange |
US9669172B2 (en) * | 2012-07-05 | 2017-06-06 | Resmed Limited | Discreet respiratory therapy system |
KR101589654B1 (en) * | 2013-04-22 | 2016-01-29 | 정현욱 | Multi-channel flowmeter |
US9080792B2 (en) | 2013-07-31 | 2015-07-14 | Ironridge, Inc. | Method and apparatus for mounting solar panels |
US9200650B2 (en) * | 2013-09-26 | 2015-12-01 | Paul D. Van Buskirk | Orifice plates |
WO2015131248A1 (en) * | 2014-03-07 | 2015-09-11 | Mezurx Pty Ltd | Compact differential pressure flow meters |
US10107700B2 (en) * | 2014-03-24 | 2018-10-23 | Rosemount Inc. | Process variable transmitter with process variable sensor carried by process gasket |
US10345124B2 (en) * | 2014-03-27 | 2019-07-09 | Dieterich Standard, Inc. | Adapter for inserting wafer ring between flanges of process piping |
CN103977919A (en) * | 2014-05-30 | 2014-08-13 | 许玉方 | Multi-hole nozzle |
US9341290B2 (en) * | 2014-09-29 | 2016-05-17 | Dieterich Standard, Inc. | Lugged wafer alignment ring |
US9255825B1 (en) | 2014-09-30 | 2016-02-09 | Rosemount Inc. | Self-aligning wafer-style process instrument |
US9476744B2 (en) * | 2014-10-08 | 2016-10-25 | Dieterich Standard, Inc. | Integrated orifice plate assembly |
US9857209B2 (en) * | 2015-03-06 | 2018-01-02 | Sanyo Denki Co., Ltd. | Measurement device for measuring airflow volume and ventilation resistance of wind-blowing apparatus |
US9651410B2 (en) | 2015-03-31 | 2017-05-16 | Dieterich Standard, Inc. | Paddle style orifice plate with integral pressure ports |
US9625293B2 (en) * | 2015-05-14 | 2017-04-18 | Daniel Sawchuk | Flow conditioner having integral pressure tap |
CN105397410B (en) * | 2015-10-29 | 2018-06-05 | 成都立创模具有限公司 | A kind of production method of metering orifice plate |
US20170322059A1 (en) * | 2016-05-09 | 2017-11-09 | Eric Lowe | Low pressure drop and high temperature flow measuring device |
US10054559B2 (en) | 2016-07-29 | 2018-08-21 | Dan Hutchinson | Compact steam quality and flow rate measurement system |
US10365143B2 (en) | 2016-09-08 | 2019-07-30 | Canada Pipeline Accessories, Co., Ltd. | Measurement ring for fluid flow in a pipeline |
DE102017202896B4 (en) * | 2017-02-22 | 2019-10-10 | Siemens Aktiengesellschaft | Flow measuring device and transmitter for process instrumentation with such a flow measuring device |
US9880032B1 (en) * | 2017-06-20 | 2018-01-30 | Johnathan W. Linney | Modular removable flow metering assembly with cone shaped differential pressure producer in a compact fluid conduit |
CN108088508A (en) * | 2018-01-09 | 2018-05-29 | 上海科洋科技股份有限公司 | A kind of differential flow measuring device |
US10908004B2 (en) * | 2018-07-13 | 2021-02-02 | Onicon Inc. | Airflow sensor and system |
CN110375815A (en) * | 2018-09-21 | 2019-10-25 | 上海科洋科技股份有限公司 | A kind of special flowmeter of text |
CN113639124B (en) * | 2020-05-11 | 2022-12-23 | 富亿鑫企业有限公司 | Protection structure of tank car sampling tube |
DE102020213512A1 (en) * | 2020-10-27 | 2022-04-28 | Siemens Aktiengesellschaft | Measuring device with pitot flow meter and method for its manufacture |
Family Cites Families (49)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1093229A (en) * | 1912-08-05 | 1914-04-14 | Gen Electric | Pitot plug for fluid-meters. |
GB522708A (en) | 1938-12-13 | 1940-06-25 | Francis Edward Yewdall | Improvements in cowls for chimneys, flues and the like |
US2687645A (en) | 1950-03-02 | 1954-08-31 | Askania Regulator Co | Differential pressure flow rate measurement device |
US3071001A (en) | 1960-02-16 | 1963-01-01 | Nat Instr Lab Inc | Linear flow meter |
US3487688A (en) | 1967-04-17 | 1970-01-06 | United Aircraft Corp | Laminar volume flow meter and construction thereof |
US3449954A (en) * | 1967-05-23 | 1969-06-17 | Control Data Corp | Ring-type flow meter |
US3645298A (en) | 1968-01-30 | 1972-02-29 | Brunswick Corp | Collimated hole flow control device |
US3521487A (en) | 1968-03-21 | 1970-07-21 | Foxboro Co | Differential pressure flowmeter run |
US3545492A (en) | 1968-05-16 | 1970-12-08 | Armco Steel Corp | Multiple plate throttling orifice |
US3838598A (en) | 1969-03-28 | 1974-10-01 | Brunswick Corp | Capillary flow meter |
US3590637A (en) * | 1969-12-17 | 1971-07-06 | William R Brown | Flow meter |
US3733898A (en) | 1970-06-05 | 1973-05-22 | Oval Eng Co Ltd | Flow conditioning apparatus |
US3805612A (en) | 1971-02-08 | 1974-04-23 | Oval Eng Co Ltd | Orifice flow meter |
US3750710A (en) | 1971-10-12 | 1973-08-07 | Sanders Associates Inc | Variable fluid orifice |
US3779076A (en) | 1972-04-17 | 1973-12-18 | Beckman Instruments Inc | Flow metering run with orifice plate |
US3779096A (en) * | 1972-05-22 | 1973-12-18 | Hurst Performance | Shift control assembly |
US4040293A (en) | 1975-12-22 | 1977-08-09 | Airflow Developments Limited | Fluid flow measuring device |
US4425807A (en) * | 1982-02-11 | 1984-01-17 | Michael Victor | Flow measuring device with constant flow coefficient |
JPS58191922A (en) | 1982-05-04 | 1983-11-09 | Yamatake Honeywell Co Ltd | Karman's vortex street flow meter |
US4538470A (en) | 1983-04-22 | 1985-09-03 | Snell Clarence G | Flow metering tube insert and method |
GB8321482D0 (en) * | 1983-08-10 | 1983-09-14 | Tekflo Ltd | Flowmeter |
US4557296A (en) | 1984-05-18 | 1985-12-10 | Byrne Thomas E | Meter tube insert and adapter ring |
AT388809B (en) | 1985-10-15 | 1989-09-11 | Avl Verbrennungskraft Messtech | MEASURING ARRANGEMENT, METHOD FOR ZERO-POINT ADJUSTMENT OF THE DIFFERENTIAL PRESSURE TRANSMITTER IN A MEASURING ARRANGEMENT, AND MEASURING DISC FOR A MEASURING ARRANGEMENT FOR FLOW MEASUREMENT OF FLUID, PREFERRED GAS FLOWS |
JPS63253258A (en) | 1987-04-10 | 1988-10-20 | Eishin Giken:Kk | Detector for minute flow rate of liquid |
US4884460A (en) * | 1988-12-01 | 1989-12-05 | Northgate Research, Inc. | Device for sensing air flow |
US4961344A (en) | 1989-05-12 | 1990-10-09 | Rodder Jerome A | Multiple tube flowmeter |
US5341848A (en) | 1989-07-20 | 1994-08-30 | Salford University Business Services Limited | Flow conditioner |
US5036711A (en) * | 1989-09-05 | 1991-08-06 | Fred P. Good | Averaging pitot tube |
US5295397A (en) | 1991-07-15 | 1994-03-22 | The Texas A & M University System | Slotted orifice flowmeter |
US5461932A (en) | 1991-07-15 | 1995-10-31 | Texas A & M University System | Slotted orifice flowmeter |
US5327941A (en) | 1992-06-16 | 1994-07-12 | The United States Of America As Represented By The Secretary Of The Navy | Cascade orificial resistive device |
US5279155A (en) | 1993-02-04 | 1994-01-18 | Honeywell, Inc. | Mass airflow sensor |
US5297426A (en) | 1993-04-07 | 1994-03-29 | Abb K-Flow Inc. | Hydrodynamic fluid divider for fluid measuring devices |
GB9313818D0 (en) | 1993-07-03 | 1993-08-18 | Expro International Group The | Apparatus and a method for measuring flow rate |
US5495872A (en) | 1994-01-31 | 1996-03-05 | Integrity Measurement Partners | Flow conditioner for more accurate measurement of fluid flow |
NL194834C (en) | 1994-03-21 | 2003-04-03 | Instromet Bv | Flow director for a turbine radar gas meter. |
US5817950A (en) * | 1996-01-04 | 1998-10-06 | Rosemount Inc. | Flow measurement compensation technique for use with an averaging pitot tube type primary element |
US5736651A (en) * | 1996-05-23 | 1998-04-07 | Bowers; James R. | High temperature gas flow sensing element |
US5773726A (en) * | 1996-06-04 | 1998-06-30 | Dieterich Technology Holding Corp. | Flow meter pitot tube with temperature sensor |
US5969266A (en) * | 1996-06-04 | 1999-10-19 | Dieterich Technology Holding Corp. | Flow meter pitot tube with temperature sensor |
US6053055A (en) | 1997-07-29 | 2000-04-25 | Nelson; Lloyd E. | Multi-port orifice meter fitting |
US6164142A (en) | 1997-10-31 | 2000-12-26 | Dimeff; John | Air flow measurement device |
US6345536B1 (en) | 1998-09-10 | 2002-02-12 | The Texas A&M University System | Multiple-phase flow meter |
US6186179B1 (en) | 1998-09-18 | 2001-02-13 | Panametrics, Inc. | Disturbance simulating flow plate |
US6494105B1 (en) | 1999-05-07 | 2002-12-17 | James E. Gallagher | Method for determining flow velocity in a channel |
US6321166B1 (en) | 1999-08-05 | 2001-11-20 | Russell N. Evans | Noise reduction differential pressure measurement probe |
US6543297B1 (en) * | 1999-09-13 | 2003-04-08 | Rosemount Inc. | Process flow plate with temperature measurement feature |
US6311568B1 (en) * | 1999-09-13 | 2001-11-06 | Rosemount, Inc. | Process flow device with improved pressure measurement feature |
US6928884B1 (en) * | 2003-09-04 | 2005-08-16 | John J. Pearson | Method and apparatus for measurement of flow rate |
-
2002
- 2002-04-09 US US10/119,283 patent/US7284450B2/en not_active Expired - Lifetime
-
2003
- 2003-02-21 MX MXPA04009470A patent/MXPA04009470A/en active IP Right Grant
- 2003-02-21 JP JP2003584634A patent/JP2005522686A/en active Pending
- 2003-02-21 WO PCT/US2003/005464 patent/WO2003087734A1/en active Application Filing
- 2003-02-21 RU RU2004132863/28A patent/RU2004132863A/en not_active Application Discontinuation
- 2003-02-21 KR KR10-2004-7015897A patent/KR20040097292A/en not_active Application Discontinuation
- 2003-02-21 CN CNA038080346A patent/CN1646885A/en active Pending
- 2003-02-21 KR KR1020097026135A patent/KR20100013325A/en not_active Application Discontinuation
- 2003-02-21 AU AU2003213244A patent/AU2003213244A1/en not_active Abandoned
- 2003-02-21 ZA ZA200408017A patent/ZA200408017B/en unknown
- 2003-02-21 CA CA2481869A patent/CA2481869C/en not_active Expired - Lifetime
- 2003-02-21 EP EP03709290A patent/EP1493001A4/en not_active Withdrawn
-
2007
- 2007-03-29 US US11/693,485 patent/US7406880B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CN1646885A (en) | 2005-07-27 |
KR20040097292A (en) | 2004-11-17 |
RU2004132863A (en) | 2005-06-27 |
WO2003087734A1 (en) | 2003-10-23 |
CA2481869C (en) | 2014-05-20 |
US20070214896A1 (en) | 2007-09-20 |
AU2003213244A1 (en) | 2003-10-27 |
EP1493001A4 (en) | 2007-05-02 |
JP2005522686A (en) | 2005-07-28 |
US20030188586A1 (en) | 2003-10-09 |
ZA200408017B (en) | 2007-04-25 |
MXPA04009470A (en) | 2005-01-25 |
US7284450B2 (en) | 2007-10-23 |
EP1493001A1 (en) | 2005-01-05 |
US7406880B2 (en) | 2008-08-05 |
KR20100013325A (en) | 2010-02-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2481869C (en) | Averaging orifice primary flow element | |
US9062994B2 (en) | Locating of pressure taps on face of orifice plate device | |
US8136980B2 (en) | Meter flow conditioner | |
US5717145A (en) | Detector for an ultrasonic flow meter | |
US4696194A (en) | Fluid flow measurement | |
EP0558650A1 (en) | Mounting means for fluid pressure transmitters | |
CA2719006C (en) | Conditioning orifice plate with pipe wall passages | |
US11555721B2 (en) | Flow meter including a combined ultrasonic flow sensing arrangement and a non-ultrasonic flow sensor arrangement for measuring wide range of flow rates | |
GB2540025A (en) | Flow conditioner having integral pressure tap | |
EP0137623B1 (en) | A flowmeter | |
EP0864076B1 (en) | Improved fluid pressure measuring system for control valves | |
US6564651B1 (en) | Modular high-temperature gas flow sensing element for use with a cyclone furnace air flow measuring system | |
JPH09101186A (en) | Pitot-tube type mass flowmeter | |
CN219624816U (en) | Flow module of thermal gas meter | |
EP3985360B1 (en) | Flow measurement using multiple pitot tubes and multiple sensing units | |
JP2003049958A (en) | Opening and closing valve of connecting passage for differential pressure detector | |
KR20030063554A (en) | Differential pressure flowmeter | |
JP3491185B2 (en) | Vortex flow meter | |
CN117759770A (en) | Flow valve | |
CN111486909A (en) | Uniform speed plate and flow meter | |
JP2003049957A (en) | Opening and closing valve of connecting passage for differential pressure detector |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |
Effective date: 20230221 |