US3840051A - Straightener - Google Patents
Straightener Download PDFInfo
- Publication number
- US3840051A US3840051A US00388261A US38826173A US3840051A US 3840051 A US3840051 A US 3840051A US 00388261 A US00388261 A US 00388261A US 38826173 A US38826173 A US 38826173A US 3840051 A US3840051 A US 3840051A
- Authority
- US
- United States
- Prior art keywords
- pipe
- straightener
- diameter
- plate
- conduits
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/02—Influencing flow of fluids in pipes or conduits
- F15D1/025—Influencing flow of fluids in pipes or conduits by means of orifice or throttle elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02763—Throttle passages using an element with multiple 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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12361—All metal or with adjacent metals having aperture or cut
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
Definitions
- FIG. 9 (A) (B) (c) (E) PATENTED 8 974 SHEET 5 0F 5 1 STRAIGHTENER This is a continuation of application Ser. No. 230,403 filed Feb. 29, 1972, now abandoned.
- This invention relates to a straightener for use in the measurement of the flow rate of a single phase fluid, either gas or liquid, flowing through a pipe which is cylindrical.
- the devices consist of a perforated plate 02, grid 03, wire gauge 04, perforated plate plus a downstream grid 06, or wire gauge 07 plus a downstream grid 08, fitted in a pipe 01.
- the straighten either an upstream channeling or swirling flow or the both to ensure uniform flow velocity distribution.
- they fail to bring a trubulent-flow velocity distribution which is necessary for the measurement with a throttling flowmeter. If a proper turbulent-flow velocity distribution is to be obtained with the use of such a straightener, there is no alternative but to employ an extended straight length and take advantage of the extra friction of the fluid with the inner Wall surface of the pipe.
- an assembly 09 consisting of a grid 010 and a perforated plate 011 adjoining to the upstream face of the grid in a cylindrical pipe, the holes of the perforated plate 011 being gradually made larger in diameter toward the center and smaller toward the periphery.
- the device of the construction described immediately above permits the use of a relatively short straight pipe portion to obtain the necessary turbulent-flow velocity distribution. Nevertheless, the device has following drawbacks.
- a straight pipe portion having a length about l0 times the diameter of the pipe must be provided downstream of the straightener.
- Another object of the invention is to provide a highly efficient straightener capable of meeting the requirements immediately above noted.
- the present invention perfected to realize the foregoing objects, resides in a straightener characterized by the use of a perforated plate in which holes of the same diameter are scattered densely in the central portion and thinly in the peripheral portion.
- FIGS. 1 to 6 show conventional straighteners as fitted in a cylindrical pipe 01;
- FIG. 1 being a front view of a perforated plate 02,
- FIG. 2 a front view of a grid 03;
- FIG. 3 a front view of a wire gauze 04;
- FIG. 4 a longitudinal sectional view of a cylindrical pipe 01 wherein are installed a perforated plate 05 and a grid 06 down stream of the plate;
- FIG. 5 a longitudinal sectional view of a cylindrical pipe 01 wherein are installed a wire gauze 07 and a downstream grid 08;
- FIG. 6 a perspective view of a straightener 09 which combines a grid 010 and a perforated plate 011 attached to the upstream face of the grid;
- FIG. 7 is a front view of a straightener embodying the invention as fitted in a cylindrical pipe 1;
- FIG. 8 is a sectional view taken on the line VIII VIII of FIG. 7;
- FIG. 9 is a view illustrating the changes of velocity distribution within a pipe 01 equipped with a known perforated-plate type straightener 012 shown inFIG. 1 (pipe size 205 mm, plate thickness 14 mm, hole diameter 7 mm, and area ratio 0.5);
- FIG. 10 is a view illustrating the changes of velocity distribution within a pipe 1 equipped with the straightener 2 according to the present invention.
- FIG. 11 is a view comparing the results of experiments with a conventional straightener of FIG. 6 and the straightener of the invention shown in FIGS: 7 and
- FIG. 12 is a graph comparing the results of experiments on the necessary straight lengths for different straighteners;
- FIG. 13 is a graph illustrating the results of experiments on the straightening effects achieved by straighteners of different sizes according to the invention.
- FIG. 14 is a plan view of the perforated plate of the straightener 09 shown in FIG. 6;
- FIG. 15 is a plan view of a quadrant of the perforated plate of the straightener according to the present invention.
- FIG. 16 is a sectional view of the quadrant.
- the hole diameter d of the plurality of holes 3 formed in the perforated plates 2 are the same.
- the distances l between adjacent holes 3 are gradually increased from the center of the cylindrical pipe 1 toward its surrounding wall.
- the number of holes 3 per unit area of the plate becomes larger towards the diametral center of the pipe and smaller towards the periphery.
- the upstream ends or inlets of the holes 3 are beveled.
- the holes are so made that the ratio of the plate thickness t to the hole diameter d, or t/d, is within the range of 1.0 to 3.0.
- FIG. 9 the changes of velocity distribution which are caused in a cylindrical pipe 01 by a conventional straightener 012.
- a velocity distribution C is obtained, and downstream of it or at a distance of about 10 D (ten times the diameter of the pipe) from the straightener, a turbulent-flow velocity distribution E is obtained.
- a measuring instrument e.g., a throttling flowmeter 014, must be installed further downstream.
- FIG. 10 shows the changes of velocity distribution in a cylindrical pipe 1 with a straightener 2 of the present invention.
- a fluid with a velocity distribution A made uneven by an obstacle not shown upstream of the straightener 2 then obtains a turbulent-flow velocity distribution F after passage through a short straight length following the straightener 2.
- the straightener can be manufactured at low cost.
- the curve drawn with an alternate long and short dash line in FIG. 12 indicates the straight length required upstream of an orifice, where no straightening device isemployed, in accordance with the ISO Recommendation.
- the broken-line curves represent the results with the conventional straighteners having the contours as illustrated in FIGS. 6 and 14 and having the dimensions of E, F and G in Table l.
- the solid-line curves represent the results with the straighteners according to this invention which have the contours as shown in FIGS. 15 and 16 and the dimensions of H, I and J as given in Table 2.
- the test pipe was fitted with two 90 bends in different planes upstream of the flowmeter.
- the straightener of the present invention kills almost all of the swirl and gives out practically no swirl immediately downstream thereof provided that the ratio of its plate thickness to the hole diameter, t/d, is 1.0 or upwards. If the t/d is less than 1.0, the straightening effect will be limited with little attenuation of the swirling flow. With a t/d in excess of 3.0, the swirling flow will not be materially reduced and the accuracy of fluid flow measurement will remain practically unimproved. In addition, the thick perforated plate will be costly and inconvenient to handle.
- the fluid flow can be measured.
- Fluid flow can be measured with noncontact currentmeters and flowmeters (e. g., ultrasonic currentmeter and electromagnetic flowmeter).
- noncontact currentmeters and flowmeters e. g., ultrasonic currentmeter and electromagnetic flowmeter.
- the straightener of the present invention is useful for the measurement of fluid flow particularly in such largediameter pipelines of large machines and plants which cannot be provided with adequate straight lengths for foreflow up to the points of measurement.
- apparatus for forming a turbulent-flow velocity distribution within a cylindrical pipe having fluid flowing therethrough said apparatus including a perforated plate mounted within said pipe to extend transversely across the path of fluid flowing through said pipe, the improvement comprising, in combination:
- conduits being of substantially equivalent diameter and disposed in said plate with the spacing between adjacent conduits increasing progressively from the inner radial portion of said plate to the outer radial portion thereof;
- conduits extending downstream from said beveled configuration over the major portion of their lengths with a generally uniform diameter throughout, said uniform diameter being generally coincident with said smaller diameter of said beveled configuration.
- said perforated plate comprises a thickness dimension taken in the direction of fluid flow through said pipe, with the ratio between said thickness dimension and said uniform diameter being within the range between I and 3.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Details Of Flowmeters (AREA)
Abstract
A perforated-plate type straightener adapted to be fitted in a cylindrical pipe across the passage of a fluid flowing through the pipe, comprising a perforated plate having a plurality of round holes which are the same in diameter and so provided that the distances between the adjacent holes are short in the axial center of the pipe and are gradually longer near the surrounding wall.
Description
Field of Search 138/39, 40, 44, 37, 41; 73/198, 205 L, 211
United States Patent 1191 1111 3,840,051 Akashi et al. [4 Oct. 8, 1974 STRAlGl-lTENER [56] References Cited [75] Inventors: Koichiro Akashi; Hisao Watanabe; UNITED STATES PATENTS Kenlchl 8 Nagask't Japan 2,688,985 9/1954 Holdenried 138/37 73 Assigneez Mitsubishi Jukogyo Kabushiki 2,825,203 3/1958 Bertm et al. 138/44 X I Kaisha, Tokyo, Japan 2,929,248 3/l960 Sprenkle 73/198 7 1, Filed: 14, 1973 Primary Examiner-Charles A. Ruehl 2 App]. 333 2 1 Attorney, Agent, or Firm-Toren and McGeady Related US. Application Data v C [63] Continuation of Ser. No. 230,403, Feb. 29, 1972, [57] ABSTRA T abandoned. A perforated-plate type straightener adapted to be fitted in a cylindrical pipe across the passage of a fluid [30] Foreign Application Priority Data flowing through the pipe, comprising a perforated Mar. 11, 1971 Japan 46-13385 plate a g a p a i y ro oles ich are the same in diameter and so provided that the distances [52] U.S. Cl. 138/37, 73/211 be een t e adjacent holes are short in the axial cen- [51] Int. Cl. Fl6d 1/00 er of the pipe and are gradually longer-near the sur- 53] rounding wall.
3 Claims, 16 Drawing Figures PAIENTEDnm 81974 SNEU 10F 5 FIG. 1 PR'OR ART FIG 2 PRIOR ART 4 YPIRYIIOR ART FIG. 3 5w 5 PRIOR ART v PAIENTEDBBT 1 14 3.840.051
'SHEETZDF 5 v FIG. 6
PRIOR ART me. 7 FIG. 8
' Q @(QW) (Q PATENTEDUBT I 3.840.051
v SHEEIMF 5 FIG. 9 (A) (B) (c) (E) PATENTED 8 974 SHEET 5 0F 5 1 STRAIGHTENER This is a continuation of application Ser. No. 230,403 filed Feb. 29, 1972, now abandoned.
This invention relates to a straightener for use in the measurement of the flow rate of a single phase fluid, either gas or liquid, flowing through a pipe which is cylindrical.
Conventional straightening devices for this purpose are available in a variety of types, such as shown in FIGS. 1 to 5. Referring to the figures, the devices consist of a perforated plate 02, grid 03, wire gauge 04, perforated plate plus a downstream grid 06, or wire gauge 07 plus a downstream grid 08, fitted in a pipe 01. The straighten either an upstream channeling or swirling flow or the both to ensure uniform flow velocity distribution. However, they fail to bring a trubulent-flow velocity distribution which is necessary for the measurement with a throttling flowmeter. If a proper turbulent-flow velocity distribution is to be obtained with the use of such a straightener, there is no alternative but to employ an extended straight length and take advantage of the extra friction of the fluid with the inner Wall surface of the pipe.
In an effort to eliminate the foregoing disadvantage, it has been proposed to install, as shown in FIG. 6, an assembly 09 consisting of a grid 010 and a perforated plate 011 adjoining to the upstream face of the grid in a cylindrical pipe, the holes of the perforated plate 011 being gradually made larger in diameter toward the center and smaller toward the periphery. As compared with the straighteners of FIGS. 1 through 5, the device of the construction described immediately above permits the use of a relatively short straight pipe portion to obtain the necessary turbulent-flow velocity distribution. Nevertheless, the device has following drawbacks.
l. A straight pipe portion having a length about l0 times the diameter of the pipe must be provided downstream of the straightener.
2. The pressure loss is great.
3. The manufacturing cost is high.
Thus, none of the known straighteners has proved quite satisfactory as means for creating a turbulentflow velocity distribution. In view of this and on the following additional grounds, the introduction of a straightener which can give a turbulent-flow velocity distribution with a short straight length of a pipe has been ardently called for.
a. The recent industrial tendency toward introduction of larger-capacity plants and machinery has made it no longer easy to maintain large length-to-diameter ratios for the straight lengths upstream of throttling flowmeters for the measurement of fluid flow in pipelines. On the other hand, the industry is demanding. more and more enhanced accuracy of measurement and is urgently looking for the straighteners which can attain such accuracy with the shortest possible straight lengths.
b. When a throttling flowmeter which has been calibrated is to be used in actual measurement of fluid flow, there is a possibility of errors due to the lack of hydrodynamic similarity if the measuring conditions differ from those at the time of calibration because of the influence of any obstacle which may exist in the pipeline, such as a bend upstream of the primary element of the flowmeter. It has been confirmedthat, particularly when the Reynolds number is high, a throttling flowmeter will give an unusual value of flow coefficient under the influence of an ununiform upstream flow. For this reason it is most essential to install a straightener which is capable of highly efficiently counteracting the effect of such upstream obstacle as a branch pipe, bend, or valve between the primary element of the flowmeter and the particular obstacle.
c. It is clear from a number of experiments so far conducted as well as from the literature that the flow velocity distribution upstream of a throttling flowmeter can materially affect the accuracy of the measurement. This means that a straightener capable of effectively attaining a turbulent-flow velocity distribution is of absolute necessity.
d. (Ionventional straighteners can uniformalize the flow velocity distribution but are unable to give a turbulent-flow velocity distribution. Where the latter is to be attained a long straight length must be used.
It is therefore a fundamental object of this invention to provide a straightener which can settle all of the problems above enumerated.
Another object of the invention is to provide a highly efficient straightener capable of meeting the requirements immediately above noted.
The present invention, perfected to realize the foregoing objects, resides in a straightener characterized by the use of a perforated plate in which holes of the same diameter are scattered densely in the central portion and thinly in the peripheral portion.
These and other objects, advantages and features of the present invention will be better understood from the following detailed description taken in conjunction with the accompanying drawings showing preferred embodiments thereof.
In the drawings:
FIGS. 1 to 6 show conventional straighteners as fitted in a cylindrical pipe 01; FIG. 1 being a front view of a perforated plate 02, FIG. 2 a front view of a grid 03; FIG. 3 a front view of a wire gauze 04; FIG. 4 a longitudinal sectional view of a cylindrical pipe 01 wherein are installed a perforated plate 05 and a grid 06 down stream of the plate; FIG. 5 a longitudinal sectional view of a cylindrical pipe 01 wherein are installed a wire gauze 07 and a downstream grid 08; and FIG. 6 a perspective view of a straightener 09 which combines a grid 010 and a perforated plate 011 attached to the upstream face of the grid;
FIG. 7 is a front view of a straightener embodying the invention as fitted in a cylindrical pipe 1;
FIG. 8 is a sectional view taken on the line VIII VIII of FIG. 7;
FIG. 9 is a view illustrating the changes of velocity distribution within a pipe 01 equipped with a known perforated-plate type straightener 012 shown inFIG. 1 (pipe size 205 mm, plate thickness 14 mm, hole diameter 7 mm, and area ratio 0.5);
FIG. 10 is a view illustrating the changes of velocity distribution within a pipe 1 equipped with the straightener 2 according to the present invention;
FIG. 11 is a view comparing the results of experiments with a conventional straightener of FIG. 6 and the straightener of the invention shown in FIGS: 7 and FIG. 12 is a graph comparing the results of experiments on the necessary straight lengths for different straighteners;
FIG. 13 is a graph illustrating the results of experiments on the straightening effects achieved by straighteners of different sizes according to the invention;
FIG. 14 is a plan view of the perforated plate of the straightener 09 shown in FIG. 6;
FIG. 15 is a plan view of a quadrant of the perforated plate of the straightener according to the present invention; and
FIG. 16 is a sectional view of the quadrant.
Throughout FIGS. 7, 8 and 15 showing embodiments of the present invention, the hole diameter d of the plurality of holes 3 formed in the perforated plates 2 are the same. The distances l between adjacent holes 3 are gradually increased from the center of the cylindrical pipe 1 toward its surrounding wall. In other words, the number of holes 3 per unit area of the plate becomes larger towards the diametral center of the pipe and smaller towards the periphery. The upstream ends or inlets of the holes 3 are beveled. Also, the holes are so made that the ratio of the plate thickness t to the hole diameter d, or t/d, is within the range of 1.0 to 3.0.
Next, the functions of the straightener according to this invention will be described hereunder with reference to FIGS. 9 and 10 and in comparison with the functions of conventional devices. In FIG. 9 are shown the changes of velocity distribution which are caused in a cylindrical pipe 01 by a conventional straightener 012. A fluid whose velocity distribution A is made ununiform by an obstacle not shown which is located upstream of the straightener 012 flows through the straightener 012 to attain a velocity distribution B which is an almost uniform flow. As the fluid proceeds through the straight length, a velocity distribution C is obtained, and downstream of it or at a distance of about 10 D (ten times the diameter of the pipe) from the straightener, a turbulent-flow velocity distribution E is obtained. It means that a measuring instrument, e.g., a throttling flowmeter 014, must be installed further downstream.
FIG. 10 shows the changes of velocity distribution in a cylindrical pipe 1 with a straightener 2 of the present invention. A fluid with a velocity distribution A made uneven by an obstacle not shown upstream of the straightener 2 then obtains a turbulent-flow velocity distribution F after passage through a short straight length following the straightener 2.
The straightener according to the present invention thus has the following advantages:
i. The straight length upstream of a throttling flowmeter can be extremely shortened.
ii. Swirl of the fluid can be reduced to almost zero.
iii. Pressure loss is negligible.
iv. Because the diameters of the holes in the perforated plate are the same, the straightener can be manufactured at low cost.
v. Fluid flow measurement is possible with a high degree of accuracy.
The velocity distribution characteristic, straight length requirements, and attenuation of swirling flow by the straightener according to this invention will be discussed hereunder in connection with the results of experiments diagrammatically represented or charted in FIGS. 11 to 13.
I. Velocity distribution characteristic (Refer to FIG. l1.)
1. First, devices of three different sizes E, F and G as given in Table l were made of perforated plates as perspectively shown in FIG. 6 and having a plane as in FIG. 14.
Notes: d diameter of hole D l.D. of pipe 205 mm Thickness of perforated plate 0.02 D Thickness of grid plate 0.005 D Depth of grid plate l.0 D
2. Next, using perforated plates having a plane as shown in FIGS. 15 and 16, devices H, I and J with dimensions as given in Table 2 were formed.
Table 2 No. H I .I
x y x y x y I 0 0 0 0 0 12.0 II 0 28.5 0 29.0 12.0 38.0 III 0 57.0 0 58.0 0 63.0 IV 0 85.0 0 87.0 0 90.0 V 25.0 l4.5 25.5 l4.5 24.0 l2.0 VI 26.5 46.0 26.0 44.5 35.0 35.0 VII 32.0 78.0 30.0 78.0 24.0 69.5 VIII 50.0 0 5l.0 0 48.0 l2.0 IX 50.0 28.5 5 l .0 29.0 56.0 48.0 X 59.0 59.0 55.5 60.0 50.0 74.0 Xl 8|.0 0 82.0 0 72.0 [6.5 XII 79.0 3 I .0 80.0 33.0 79.5 40.5 Hole 26.5 28.0 20.0 dia.
Notes: Unit mm Perforated plate dia. R [02.55 mm 3. The conventional device E and the device 11 of the invention, both adjusted in size to 200 mm in diameter, were fitted in straight pipes 1 having a inside diameter of 200 mm, and a bend was connected upstream to each pipe, and then the flow velocity distributions in the pipes were determined. The data thus obtained are diagrammatically represented in FIG. 11. At a point 1 D (a distance equal to the pipe diameter D) upstream of each straightener, the flow velocity distribution was irregular as represented by a curve A. At a point 1.5 D downstream of the straightener, the distribution was changed as represented by the curve B in the case of a conventional straightener of FIG. 6 or by the curve B in the case of the device of the invention shown in FIGS. 15 and 16. In either case the resulting curve was substantially symmetrical with the center axis of the pipe. Nevertheless, as will be obvious from those figures, the conventional straightener gave a distribution much different from the turbulentflow velocity distribution which is required for a throttling flowmeter, whereas the straightener of the invention produced a substantially perfect turbulentflow velocity distribution. When the pressure loss involved was determined, the loss with the straightener of the invention was several ten percent less than that with the conventional device.
II. Straight length characteristic (Refer to FIG. 12.)
In FIG. 12 which records the results of experiments on straight length requirements, the numbers on the abscissa indicate the diameter ratio of the orifice l4. Plotted as ordinate is the ratio of straight length L to pipe diameter D which is required for confining the error due to the effect of conditions upstream of the orifice within the tolerance value of 0.5 per cent as specified in the ISO Recommendation R541.
The curve drawn with an alternate long and short dash line in FIG. 12 indicates the straight length required upstream of an orifice, where no straightening device isemployed, in accordance with the ISO Recommendation. The broken-line curves represent the results with the conventional straighteners having the contours as illustrated in FIGS. 6 and 14 and having the dimensions of E, F and G in Table l. The solid-line curves represent the results with the straighteners according to this invention which have the contours as shown in FIGS. 15 and 16 and the dimensions of H, I and J as given in Table 2. In each experiment the test pipe was fitted with two 90 bends in different planes upstream of the flowmeter.
It will be appreciated from the graph that the straightener according to the present invention makes it possible to use by far the shorter straight length upstream of the flowmeter than the lengths usually required by the conventional devices.
III. Swirling-flow attenuation characteristic (Refer to FIG. 13.)
Using straighteners according to the invention with varied ratios of the thickness t of its perforated plate 2 to the hole diameter d and supplying a swirling flow at a certain angle of swirl to the upstream of each test straightener, the angle of swirl downstream of the device was determined. The results are given in FIG. 13. The angles were determined at points 1 D upstream and 1.5 D downstream of each test straightener. The curves H, I and J correspond to the columns H, I and J of Table 2.
As can be seen from the graph, the straightener of the present invention kills almost all of the swirl and gives out practically no swirl immediately downstream thereof provided that the ratio of its plate thickness to the hole diameter, t/d, is 1.0 or upwards. If the t/d is less than 1.0, the straightening effect will be limited with little attenuation of the swirling flow. With a t/d in excess of 3.0, the swirling flow will not be materially reduced and the accuracy of fluid flow measurement will remain practically unimproved. In addition, the thick perforated plate will be costly and inconvenient to handle.
The straightener according to the present invention has the following advantages:
A. High precision measurement of fluid flow with a throttling flowmeter is made possible.
B. On the basis of computation of the flow velocity at one point within a pipeline (e.g., without traversing with a pilot tube), the fluid flow can be measured.
C. Fluid flow can be measured with noncontact currentmeters and flowmeters (e. g., ultrasonic currentmeter and electromagnetic flowmeter).
The straightener of the present invention is useful for the measurement of fluid flow particularly in such largediameter pipelines of large machines and plants which cannot be provided with adequate straight lengths for foreflow up to the points of measurement.
What is claimed is:
1. In apparatus for forming a turbulent-flow velocity distribution within a cylindrical pipe having fluid flowing therethrough, said apparatus including a perforated plate mounted within said pipe to extend transversely across the path of fluid flowing through said pipe, the improvement comprising, in combination:
means defining a plurality of cylindrical flow conduits extending through said plate in the direction of said fluid flow,
said conduits being of substantially equivalent diameter and disposed in said plate with the spacing between adjacent conduits increasing progressively from the inner radial portion of said plate to the outer radial portion thereof; and
means defining the upstream ends of said conduits with a beveled configuration extending from a wider diameter to a smaller diameter taken in the direction of fluid flow;
said conduits extending downstream from said beveled configuration over the major portion of their lengths with a generally uniform diameter throughout, said uniform diameter being generally coincident with said smaller diameter of said beveled configuration.
2. Apparatus according to claim 1, wherein said perforated plate comprises a thickness dimension taken in the direction of fluid flow through said pipe, with the ratio between said thickness dimension and said uniform diameter being within the range between I and 3.
face.
Claims (3)
1. In apparatus for forming a turbulent-flow velocity distribution within a cylindrical pipe having fluid flowing therethrough, said apparatus including a perforated plate mounted within said pipe to extend transversely across the path of fluid flowing through said pipe, the improvement comprising, in combination: means defining a plurality of cylindrical flow conduits extending through said plate in the direction of said fluid flow, said conduits being of substantially equivalent diameter and disposed in said plate with the spacing between adjacent conduits increasing progressively from the inner radial portion of said plate to the outer radial portion thereof; and means defining the upstream ends of said conduits with a beveled configuration extending from a wider diameter to a smaller diameter taken in the direction of fluid flow; said conduits extending downstream from said beveled configuration over the major portion of their lengths with a generally uniform diameter throughout, said uniform diameter being generally coincident with said smaller diameter of said beveled configuration.
2. Apparatus according to claim 1, wherein said perforated plate comprises a thickness dimension taken in the direction of fluid flow through said pipe, with the ratio between said thickness dimension and said uniform diameter being within the range between 1 and 3.
3. Apparatus according to claim 1, wherein said beveled configuration is in the form of frusto-conical surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00388261A US3840051A (en) | 1971-03-11 | 1973-08-14 | Straightener |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1338571A JPS5137022B1 (en) | 1971-03-11 | 1971-03-11 | |
US23040372A | 1972-02-29 | 1972-02-29 | |
US00388261A US3840051A (en) | 1971-03-11 | 1973-08-14 | Straightener |
Publications (1)
Publication Number | Publication Date |
---|---|
US3840051A true US3840051A (en) | 1974-10-08 |
Family
ID=27280225
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00388261A Expired - Lifetime US3840051A (en) | 1971-03-11 | 1973-08-14 | Straightener |
Country Status (1)
Country | Link |
---|---|
US (1) | US3840051A (en) |
Cited By (98)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3964519A (en) * | 1974-11-18 | 1976-06-22 | Air Monitor Corporation | Fluid velocity equalizing apparatus |
US4142413A (en) * | 1976-06-08 | 1979-03-06 | N.V. Nederlandse Gasunie | Device for improving the flow profile in a gas line |
DE3100777A1 (en) * | 1980-12-09 | 1982-07-01 | LGZ Landis & Gyr Zug AG, 6301 Zug | Transducer for determining the flow rate of a flowing liquid |
USRE31258E (en) * | 1974-11-18 | 1983-05-31 | Air Monitor Corporation | Fluid velocity equalizing apparatus |
DE3216946A1 (en) * | 1982-05-06 | 1983-11-10 | Leybold-Heraeus GmbH, 5000 Köln | Oil-sealed vacuum pump |
US4559275A (en) * | 1982-06-23 | 1985-12-17 | Bbc Brown, Boveri & Company, Limited | Perforated plate for evening out the velocity distribution |
US4660587A (en) * | 1986-07-28 | 1987-04-28 | Rizzie Joseph W | System for producing uniform velocity distribution of fluids in conduits |
US4781536A (en) * | 1986-09-10 | 1988-11-01 | Hicks Russell R | Low-flow pump-off control |
US4842806A (en) * | 1986-09-16 | 1989-06-27 | Kabushiki Kaisha Toshiba | Device for measuring recirculating flow rate in a nuclear reactor |
DE3744424A1 (en) * | 1987-12-29 | 1989-07-13 | Wilhelm Odendahl | Throttle valve |
US4905709A (en) * | 1989-01-17 | 1990-03-06 | Advanced Medical Systems, Inc. | Disposable tubular pneumotachometer |
FR2640351A1 (en) * | 1988-12-13 | 1990-06-15 | Total Petroles | RECTIFIER OF THE FLOW OF A FLUID IN A PIPELINE |
US5024806A (en) * | 1989-09-21 | 1991-06-18 | Westinghouse Electric Corp. | Enhanced debris filter bottom nozzle for a nuclear fuel assembly |
US5099879A (en) * | 1991-05-16 | 1992-03-31 | Coen Company, Inc. | Combustion air flow stabilizer |
US5345483A (en) * | 1993-12-02 | 1994-09-06 | General Electric Company | Lower tie plate strainers having double plate with offset holes for boiling water reactors |
US5372048A (en) * | 1991-12-19 | 1994-12-13 | Muir Products, Inc. | Floating-type turbine flow meter |
US5390221A (en) * | 1993-08-23 | 1995-02-14 | General Electric Company | Debris filters with flow bypass for boiling water reactors |
US5390220A (en) * | 1993-11-29 | 1995-02-14 | General Electric Company | Lower tie plate strainers including helical spring strainers for boiling water reactors |
US5392815A (en) * | 1993-08-05 | 1995-02-28 | Pacific Gas And Electric Company | Gradational tube bundle flow conditioner for providing a natural flow profile to facilitate accurate orifice metering in fluid filled conduits |
WO1995019504A1 (en) * | 1994-01-13 | 1995-07-20 | Orion Safety Industries Pty. Limited | Fluid flow conditioner |
US5445035A (en) * | 1991-12-18 | 1995-08-29 | Delajoud; Pierre R. | Precision gas mass flow measurement apparatus and method maintaining constant fluid temperature in thin elongated flow path |
US5473650A (en) * | 1994-04-15 | 1995-12-05 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5481578A (en) * | 1994-06-24 | 1996-01-02 | General Electric Company | Perforated tube debris catcher for a nuclear reactor |
US5483564A (en) * | 1993-04-12 | 1996-01-09 | General Electric Company | Lower tie plate strainers including double corrugated strainers for boiling water reactors |
US5488634A (en) * | 1994-02-10 | 1996-01-30 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5495872A (en) * | 1994-01-31 | 1996-03-05 | Integrity Measurement Partners | Flow conditioner for more accurate measurement of fluid flow |
US5519745A (en) * | 1994-11-03 | 1996-05-21 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5528640A (en) * | 1994-11-07 | 1996-06-18 | General Electric Company | Low pressure double offset plate catcher for a nuclear reactor |
US5539793A (en) * | 1994-10-27 | 1996-07-23 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5683032A (en) * | 1995-06-29 | 1997-11-04 | Ford Global Technologies, Inc. | Air measuring apparatus and method for paint rotary bell atomizers |
WO1998005872A1 (en) * | 1996-08-02 | 1998-02-12 | Jansen Robert C | Flow system for pipes, pipe fittings, ducts and ducting elements |
US5728942A (en) * | 1995-11-28 | 1998-03-17 | Boger; Henry W. | Fluid pressure measuring system for control valves |
US5748694A (en) * | 1996-03-26 | 1998-05-05 | General Electric Company | Fuel bundle filter for a nuclear reactor fuel bundle assembly |
US5762107A (en) * | 1993-09-14 | 1998-06-09 | Den Norske Stats Oljeselskap A.S. | Flow conditioner |
US5763792A (en) * | 1996-05-03 | 1998-06-09 | Dragerwerk Ag | Respiratory flow sensor |
US5837903A (en) * | 1995-09-22 | 1998-11-17 | The Scott Fetzer Company Inc. | Device for measuring exhaust flowrate using laminar flow element |
US5922970A (en) * | 1996-08-21 | 1999-07-13 | Endress + Hauser Flowtec Ag | Vortex flow sensor with a turbulence grid |
US5979595A (en) * | 1996-10-18 | 1999-11-09 | New Philadelphia Fan Company | Fan inlet flow controller |
DE19838314A1 (en) * | 1998-08-24 | 2000-03-09 | Gillet Heinrich Gmbh | Silencer for exhaust gases in combustion engines has body with several parallel flow channels filling out pipe section at least in part to break up gas flow into lines |
US6145544A (en) * | 1998-03-13 | 2000-11-14 | Gaz De France | Flow conditioner for a gas transport pipe |
US6164142A (en) * | 1997-10-31 | 2000-12-26 | Dimeff; John | Air flow measurement device |
US6324917B1 (en) * | 1999-03-11 | 2001-12-04 | Mark Products, Inc. | Combination air pipe connector and flow measurement device |
US6494105B1 (en) | 1999-05-07 | 2002-12-17 | James E. Gallagher | Method for determining flow velocity in a channel |
US20030058737A1 (en) * | 2001-09-25 | 2003-03-27 | Berry Jonathan Dwight | Mixer/flow conditioner |
US20030178592A1 (en) * | 2002-03-22 | 2003-09-25 | Dresser, Inc. | Noise reduction device for fluid flow systems |
US20030185334A1 (en) * | 2002-04-01 | 2003-10-02 | Kabushiki Kaisha Toshiba | Core inlet structure for coolant |
US6651514B2 (en) | 2001-11-16 | 2003-11-25 | Daniel Industries, Inc. | Dual function flow conditioner and check meter |
US6701963B1 (en) * | 2003-05-12 | 2004-03-09 | Horiba Instruments, Inc. | Flow conditioner |
US20040206082A1 (en) * | 2003-04-15 | 2004-10-21 | Martin Steven P. | Turbocharger with compressor stage flow conditioner |
US6807857B2 (en) * | 2002-06-05 | 2004-10-26 | Halliburton Energy Services, Inc. | Method and apparatus for determining density of a flowing fluid |
WO2004092687A1 (en) * | 2003-04-15 | 2004-10-28 | Ems-Patent Ag | Differential pressure means for a gas meter arrangement, comprising an improved flow geometry |
US20050017019A1 (en) * | 2003-07-21 | 2005-01-27 | Richter James R. | Pipe flow stabilizer |
US20050040260A1 (en) * | 2003-08-21 | 2005-02-24 | Zhibo Zhao | Coaxial low pressure injection method and a gas collimator for a kinetic spray nozzle |
US20050157836A1 (en) * | 2004-01-05 | 2005-07-21 | Broach Kirkland D. | Nuclear fuel assembly debris filter bottom nozzle |
US20050160784A1 (en) * | 2004-01-23 | 2005-07-28 | Paul Tang | Medium, method and system for proving a turbine meter |
US20050263199A1 (en) * | 2002-11-26 | 2005-12-01 | David Meheen | Flow laminarizing device |
US20060006022A1 (en) * | 2002-09-18 | 2006-01-12 | Savant Measurement Corporation | Apparatus for filtering ultrasonic noise within a fluid flow system |
US20060278289A1 (en) * | 2005-06-08 | 2006-12-14 | Robinson Bruce L | Storm water flow restriction method and apparatus |
US20070193373A1 (en) * | 2003-09-29 | 2007-08-23 | Schlumberger Technology Corporation | Isokinetic sampling |
US20090101018A1 (en) * | 2007-10-23 | 2009-04-23 | Wen-Hwa Wang | Turbulence device used for air filtration system |
US20090139345A1 (en) * | 2005-11-22 | 2009-06-04 | Schlumberger Technology Corporation | Isokinetic sampling method and system for multiphase flow from subterranean wells |
US20090199656A1 (en) * | 2008-02-12 | 2009-08-13 | Sunita Rani | Systems and methods for managing pressure and flow rate |
WO2010018055A1 (en) * | 2008-08-11 | 2010-02-18 | Robert Bosch Gmbh | Sensor arrangement for determining a parameter of a fluid medium |
US20100145634A1 (en) * | 2007-03-27 | 2010-06-10 | Schlumberger Technology Corporation | System and method for spot check analysis or spot sampling of a multiphase mixture flowing in a pipeline |
US20100154930A1 (en) * | 2008-12-19 | 2010-06-24 | Delaware Capital Formation, Inc. | Fuel flow shaper |
US20100291495A1 (en) * | 2007-11-19 | 2010-11-18 | Sit La Precisa S.P.A. Con Socio Unico | Burner, specifically a premix burner |
US7845688B2 (en) | 2007-04-04 | 2010-12-07 | Savant Measurement Corporation | Multiple material piping component |
US20110011479A1 (en) * | 2009-07-17 | 2011-01-20 | Stefan Chalupa | Modularly structured flow conditioning unit |
US20120275558A1 (en) * | 2007-08-22 | 2012-11-01 | Luciano Cinotti | Pressurized-water-cooled nuclear reactor with compact steam generators |
US8307943B2 (en) * | 2010-07-29 | 2012-11-13 | General Electric Company | High pressure drop muffling system |
DE102011079993A1 (en) | 2011-07-28 | 2013-01-31 | Endress + Hauser Flowtec Ag | Flow straightener |
US8430202B1 (en) | 2011-12-28 | 2013-04-30 | General Electric Company | Compact high-pressure exhaust muffling devices |
US8511096B1 (en) | 2012-04-17 | 2013-08-20 | General Electric Company | High bleed flow muffling system |
US8550208B1 (en) | 2012-04-23 | 2013-10-08 | General Electric Company | High pressure muffling devices |
US20140338771A1 (en) * | 2013-05-17 | 2014-11-20 | Cameron International Corporation | Flow Conditioner and Method for Optimization |
US20150316084A1 (en) * | 2013-01-17 | 2015-11-05 | Canada Pipeline Accessories, Co. Ltd. | Flow Conditioner with Integral Vanes |
US20160010803A1 (en) * | 2013-03-15 | 2016-01-14 | Institute Of Science And Technology Austria | Eliminating turbulence in wall-bounded flows by distorting the flow velocity distribution in a direction perpendicular to the wall |
CN101874197B (en) * | 2007-11-26 | 2016-02-24 | 罗伯特·博世有限公司 | For measuring the sensor device of the parameter of fluid media (medium) |
CN105444828A (en) * | 2015-08-21 | 2016-03-30 | 宁波市鹏盛科技发展有限公司 | Design method for rectifier of ultrasonic flowmeter |
CN105465537A (en) * | 2015-12-31 | 2016-04-06 | 山东思达特测控设备有限公司 | Rectifier with noise eliminating function |
CN105673626A (en) * | 2016-03-31 | 2016-06-15 | 中国海洋大学 | Turbulence flow-to-laminar flow casing pipe heating temperature field collection device |
US20160208974A1 (en) * | 2013-10-31 | 2016-07-21 | Mitsubishi Hitachi Power Systems, Ltd. | Multistage pressure reduction device and boiler |
US9399951B2 (en) | 2012-04-17 | 2016-07-26 | General Electric Company | Modular louver system |
DE102015105058A1 (en) | 2015-04-01 | 2016-10-06 | Endress+Hauser Flowtec Ag | Flow straightener |
EP3133299A1 (en) * | 2015-08-20 | 2017-02-22 | Sanyo Denki Co., Ltd. | Measurement device |
US9605695B2 (en) | 2013-05-21 | 2017-03-28 | Canada Pipeline Accessories, Co. Ltd. | Flow conditioner and method of designing same |
US9909213B2 (en) * | 2013-08-12 | 2018-03-06 | Applied Materials, Inc. | Recursive pumping for symmetrical gas exhaust to control critical dimension uniformity in plasma reactors |
JP6295385B1 (en) * | 2017-04-07 | 2018-03-14 | 清 高浦 | Compressed air pressure stabilizer in air cylinder exhaust chamber |
US20200132221A1 (en) * | 2018-10-26 | 2020-04-30 | Fisher Controls International Llc | Flow conditioner for a valve assembly |
US10704574B2 (en) * | 2018-08-31 | 2020-07-07 | Denso International America, Inc. | HVAC airflow baffle |
DE102019108551A1 (en) * | 2019-04-02 | 2020-10-08 | Endress+Hauser Flowtec Ag | Process connection for connecting a flow measuring device to a pipeline, field device for automation technology and a method for fastening a flow straightener to a process connection |
US10954976B2 (en) * | 2018-08-08 | 2021-03-23 | Contitech Mgw Gmbh | Device for controlling the swirl of a fluid flowing in a pipeline |
RU2756397C1 (en) * | 2020-09-25 | 2021-09-30 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Apparatus for levelling the speed profile of a liquid or gas flow |
WO2022032622A1 (en) * | 2020-08-14 | 2022-02-17 | 西人马联合测控(泉州)科技有限公司 | Pipe flow rectification device and pipe |
US11460140B2 (en) | 2017-10-26 | 2022-10-04 | Performance Pulsation Control, Inc. | Mini-dampeners at pump combined with system pulsation dampener |
US11464885B2 (en) | 2018-04-20 | 2022-10-11 | Asahi Kasei Kabushiki Kaisha | Ultraviolet light irradiation device |
US11473711B2 (en) | 2017-10-26 | 2022-10-18 | Performance Pulsation Control, Inc. | System pulsation dampener device(s) substituting for pulsation dampeners utilizing compression material therein |
US11591859B2 (en) | 2020-10-12 | 2023-02-28 | Performance Pulsation Control, Inc. | Surface equipment protection from borehole pulsation energies |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2688985A (en) * | 1951-08-20 | 1954-09-14 | Daniel Orifice Fitting Company | Orifice fitting device and straightening vane unit assembly |
US2825203A (en) * | 1951-08-03 | 1958-03-04 | Snecma | Aerodynamic valves |
US2929248A (en) * | 1957-11-13 | 1960-03-22 | Bailey Meter Co | Flow meter |
-
1973
- 1973-08-14 US US00388261A patent/US3840051A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2825203A (en) * | 1951-08-03 | 1958-03-04 | Snecma | Aerodynamic valves |
US2688985A (en) * | 1951-08-20 | 1954-09-14 | Daniel Orifice Fitting Company | Orifice fitting device and straightening vane unit assembly |
US2929248A (en) * | 1957-11-13 | 1960-03-22 | Bailey Meter Co | Flow meter |
Cited By (153)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE31258E (en) * | 1974-11-18 | 1983-05-31 | Air Monitor Corporation | Fluid velocity equalizing apparatus |
US3964519A (en) * | 1974-11-18 | 1976-06-22 | Air Monitor Corporation | Fluid velocity equalizing apparatus |
US4142413A (en) * | 1976-06-08 | 1979-03-06 | N.V. Nederlandse Gasunie | Device for improving the flow profile in a gas line |
DE3100777A1 (en) * | 1980-12-09 | 1982-07-01 | LGZ Landis & Gyr Zug AG, 6301 Zug | Transducer for determining the flow rate of a flowing liquid |
DE3216946A1 (en) * | 1982-05-06 | 1983-11-10 | Leybold-Heraeus GmbH, 5000 Köln | Oil-sealed vacuum pump |
US4559275A (en) * | 1982-06-23 | 1985-12-17 | Bbc Brown, Boveri & Company, Limited | Perforated plate for evening out the velocity distribution |
US4660587A (en) * | 1986-07-28 | 1987-04-28 | Rizzie Joseph W | System for producing uniform velocity distribution of fluids in conduits |
US4781536A (en) * | 1986-09-10 | 1988-11-01 | Hicks Russell R | Low-flow pump-off control |
US4842806A (en) * | 1986-09-16 | 1989-06-27 | Kabushiki Kaisha Toshiba | Device for measuring recirculating flow rate in a nuclear reactor |
DE3744424A1 (en) * | 1987-12-29 | 1989-07-13 | Wilhelm Odendahl | Throttle valve |
WO1990007079A1 (en) * | 1988-12-13 | 1990-06-28 | Total Compagnie Française Des Petroles | Rectifier for adjusting the flow of a liquid in a pipe |
FR2640351A1 (en) * | 1988-12-13 | 1990-06-15 | Total Petroles | RECTIFIER OF THE FLOW OF A FLUID IN A PIPELINE |
US4905709A (en) * | 1989-01-17 | 1990-03-06 | Advanced Medical Systems, Inc. | Disposable tubular pneumotachometer |
US5024806A (en) * | 1989-09-21 | 1991-06-18 | Westinghouse Electric Corp. | Enhanced debris filter bottom nozzle for a nuclear fuel assembly |
US5099879A (en) * | 1991-05-16 | 1992-03-31 | Coen Company, Inc. | Combustion air flow stabilizer |
US5445035A (en) * | 1991-12-18 | 1995-08-29 | Delajoud; Pierre R. | Precision gas mass flow measurement apparatus and method maintaining constant fluid temperature in thin elongated flow path |
US5372048A (en) * | 1991-12-19 | 1994-12-13 | Muir Products, Inc. | Floating-type turbine flow meter |
US5483564A (en) * | 1993-04-12 | 1996-01-09 | General Electric Company | Lower tie plate strainers including double corrugated strainers for boiling water reactors |
US5392815A (en) * | 1993-08-05 | 1995-02-28 | Pacific Gas And Electric Company | Gradational tube bundle flow conditioner for providing a natural flow profile to facilitate accurate orifice metering in fluid filled conduits |
US5390221A (en) * | 1993-08-23 | 1995-02-14 | General Electric Company | Debris filters with flow bypass for boiling water reactors |
US5762107A (en) * | 1993-09-14 | 1998-06-09 | Den Norske Stats Oljeselskap A.S. | Flow conditioner |
US5390220A (en) * | 1993-11-29 | 1995-02-14 | General Electric Company | Lower tie plate strainers including helical spring strainers for boiling water reactors |
US5345483A (en) * | 1993-12-02 | 1994-09-06 | General Electric Company | Lower tie plate strainers having double plate with offset holes for boiling water reactors |
WO1995019504A1 (en) * | 1994-01-13 | 1995-07-20 | Orion Safety Industries Pty. Limited | Fluid flow conditioner |
US6047903A (en) * | 1994-01-13 | 2000-04-11 | Orion Safety Industries Pty. Limited | Fluid flow conditioner |
US5495872A (en) * | 1994-01-31 | 1996-03-05 | Integrity Measurement Partners | Flow conditioner for more accurate measurement of fluid flow |
US5529093A (en) * | 1994-01-31 | 1996-06-25 | Integrity Measurement Partners | Flow conditioner profile plate for more accurate measurement of fluid flow |
US5488634A (en) * | 1994-02-10 | 1996-01-30 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5473650A (en) * | 1994-04-15 | 1995-12-05 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5481578A (en) * | 1994-06-24 | 1996-01-02 | General Electric Company | Perforated tube debris catcher for a nuclear reactor |
US5539793A (en) * | 1994-10-27 | 1996-07-23 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5519745A (en) * | 1994-11-03 | 1996-05-21 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5528640A (en) * | 1994-11-07 | 1996-06-18 | General Electric Company | Low pressure double offset plate catcher for a nuclear reactor |
US5683032A (en) * | 1995-06-29 | 1997-11-04 | Ford Global Technologies, Inc. | Air measuring apparatus and method for paint rotary bell atomizers |
US5837903A (en) * | 1995-09-22 | 1998-11-17 | The Scott Fetzer Company Inc. | Device for measuring exhaust flowrate using laminar flow element |
US5728942A (en) * | 1995-11-28 | 1998-03-17 | Boger; Henry W. | Fluid pressure measuring system for control valves |
US5748694A (en) * | 1996-03-26 | 1998-05-05 | General Electric Company | Fuel bundle filter for a nuclear reactor fuel bundle assembly |
US5763792A (en) * | 1996-05-03 | 1998-06-09 | Dragerwerk Ag | Respiratory flow sensor |
GB2332068A (en) * | 1996-08-02 | 1999-06-09 | Robert Carl Jansen | Flow system for pipes, pipe fittings, ducts and ducting elements |
WO1998005872A1 (en) * | 1996-08-02 | 1998-02-12 | Jansen Robert C | Flow system for pipes, pipe fittings, ducts and ducting elements |
GB2332068B (en) * | 1996-08-02 | 2000-07-12 | Robert Carl Jansen | Flow system for pipes, pipe fittings, ducts and ducting elements |
US5922970A (en) * | 1996-08-21 | 1999-07-13 | Endress + Hauser Flowtec Ag | Vortex flow sensor with a turbulence grid |
US6148954A (en) * | 1996-10-18 | 2000-11-21 | Joy Mm Delaware, Inc. | Fan inlet flow controller |
US6193011B1 (en) | 1996-10-18 | 2001-02-27 | New Philadelphia Fan Company | Fan inlet flow controller |
US5979595A (en) * | 1996-10-18 | 1999-11-09 | New Philadelphia Fan Company | Fan inlet flow controller |
US6164142A (en) * | 1997-10-31 | 2000-12-26 | Dimeff; John | Air flow measurement device |
US6145544A (en) * | 1998-03-13 | 2000-11-14 | Gaz De France | Flow conditioner for a gas transport pipe |
DE19838314A1 (en) * | 1998-08-24 | 2000-03-09 | Gillet Heinrich Gmbh | Silencer for exhaust gases in combustion engines has body with several parallel flow channels filling out pipe section at least in part to break up gas flow into lines |
US6324917B1 (en) * | 1999-03-11 | 2001-12-04 | Mark Products, Inc. | Combination air pipe connector and flow measurement device |
US6494105B1 (en) | 1999-05-07 | 2002-12-17 | James E. Gallagher | Method for determining flow velocity in a channel |
US20030131667A1 (en) * | 1999-05-07 | 2003-07-17 | Gallagher James E. | Method and apparatus for determining flow velocity in a channel |
US6851322B2 (en) | 1999-05-07 | 2005-02-08 | Savant Measurement Corporation | Method and apparatus for determining flow velocity in a channel |
US20030058737A1 (en) * | 2001-09-25 | 2003-03-27 | Berry Jonathan Dwight | Mixer/flow conditioner |
US6651514B2 (en) | 2001-11-16 | 2003-11-25 | Daniel Industries, Inc. | Dual function flow conditioner and check meter |
US6807986B2 (en) * | 2002-03-22 | 2004-10-26 | Dresser, Inc. | Noise reduction device for fluid flow systems |
US20040262553A1 (en) * | 2002-03-22 | 2004-12-30 | Dresser, Inc., A Delaware Corporation | Noise reductio device for fluid flow systems |
US6880579B2 (en) * | 2002-03-22 | 2005-04-19 | Dresser, Inc. | Noise reduction device for fluid flow systems |
US20030178592A1 (en) * | 2002-03-22 | 2003-09-25 | Dresser, Inc. | Noise reduction device for fluid flow systems |
US20030185334A1 (en) * | 2002-04-01 | 2003-10-02 | Kabushiki Kaisha Toshiba | Core inlet structure for coolant |
US6807857B2 (en) * | 2002-06-05 | 2004-10-26 | Halliburton Energy Services, Inc. | Method and apparatus for determining density of a flowing fluid |
US20060011412A1 (en) * | 2002-09-18 | 2006-01-19 | Savant Measurement Corporation | Apparatus for filtering ultrasonic noise within a fluid flow system |
US7303047B2 (en) | 2002-09-18 | 2007-12-04 | Savant Measurement Corporation | Apparatus for filtering ultrasonic noise within a fluid flow system |
US7303048B2 (en) | 2002-09-18 | 2007-12-04 | Savant Measurement Corporation | Method for filtering ultrasonic noise within a fluid flow system |
US7303046B2 (en) | 2002-09-18 | 2007-12-04 | Savant Measurement Corporation | Apparatus for filtering ultrasonic noise within a fluid flow system |
US20060011413A1 (en) * | 2002-09-18 | 2006-01-19 | Savant Measurement Corporation | Method for filtering ultrasonic noise within a fluid flow system |
US20060006022A1 (en) * | 2002-09-18 | 2006-01-12 | Savant Measurement Corporation | Apparatus for filtering ultrasonic noise within a fluid flow system |
US20050263199A1 (en) * | 2002-11-26 | 2005-12-01 | David Meheen | Flow laminarizing device |
US7089963B2 (en) * | 2002-11-26 | 2006-08-15 | David Meheen | Flow laminarizing device |
US7464611B2 (en) | 2003-04-15 | 2008-12-16 | Ems-Patent Ag | Differential pressure means for a gas meter arrangement, comprising an improved flow geometry |
US20090090195A1 (en) * | 2003-04-15 | 2009-04-09 | Daniel Matter | Differential pressure means for a gas meter arrangement, comprising an improved flow geometry |
US20040206082A1 (en) * | 2003-04-15 | 2004-10-21 | Martin Steven P. | Turbocharger with compressor stage flow conditioner |
US20060013682A1 (en) * | 2003-04-15 | 2006-01-19 | Martin Steven P | Turbocharger with compressor stage flow conditioner |
US7698958B2 (en) * | 2003-04-15 | 2010-04-20 | Hydrometer Gmbh | Differential pressure means for a gas meter arrangement, comprising an improved flow geometry |
US20070163356A1 (en) * | 2003-04-15 | 2007-07-19 | Daniel Matter | Differential pressure means for a gas meter arrangement, comprising an improved flow geometry |
WO2004092687A1 (en) * | 2003-04-15 | 2004-10-28 | Ems-Patent Ag | Differential pressure means for a gas meter arrangement, comprising an improved flow geometry |
US6701963B1 (en) * | 2003-05-12 | 2004-03-09 | Horiba Instruments, Inc. | Flow conditioner |
JP4658059B2 (en) * | 2003-05-12 | 2011-03-23 | 株式会社堀場製作所 | rectifier |
US20070215226A1 (en) * | 2003-07-21 | 2007-09-20 | Richter James R | Pipe flow stabilizer |
US7347223B2 (en) | 2003-07-21 | 2008-03-25 | The Metraflex Company | Pipe flow stabilizer |
US20050017019A1 (en) * | 2003-07-21 | 2005-01-27 | Richter James R. | Pipe flow stabilizer |
US7730907B2 (en) | 2003-07-21 | 2010-06-08 | The Metraflex Company | Device, with vanes, for use within a pipeline, and pipeline arrangement including such device |
US20050040260A1 (en) * | 2003-08-21 | 2005-02-24 | Zhibo Zhao | Coaxial low pressure injection method and a gas collimator for a kinetic spray nozzle |
US20070193373A1 (en) * | 2003-09-29 | 2007-08-23 | Schlumberger Technology Corporation | Isokinetic sampling |
US7717000B2 (en) | 2003-09-29 | 2010-05-18 | Schlumberger Technology Corporation | Isokinetic sampling |
US20050157836A1 (en) * | 2004-01-05 | 2005-07-21 | Broach Kirkland D. | Nuclear fuel assembly debris filter bottom nozzle |
US7822165B2 (en) * | 2004-01-05 | 2010-10-26 | Westinghouse Electric Co Llc | Nuclear fuel assembly debris filter bottom nozzle |
US7155956B2 (en) * | 2004-01-23 | 2007-01-02 | Terasen Gas Inc. | Medium, method and system for proving a turbine meter |
US20050160784A1 (en) * | 2004-01-23 | 2005-07-28 | Paul Tang | Medium, method and system for proving a turbine meter |
US20060278289A1 (en) * | 2005-06-08 | 2006-12-14 | Robinson Bruce L | Storm water flow restriction method and apparatus |
US7497234B2 (en) * | 2005-06-08 | 2009-03-03 | Bruce Locke Robinson | Storm water flow restriction method and apparatus |
US7942065B2 (en) | 2005-11-22 | 2011-05-17 | Schlumberger Technology Corporation | Isokinetic sampling method and system for multiphase flow from subterranean wells |
US20090139345A1 (en) * | 2005-11-22 | 2009-06-04 | Schlumberger Technology Corporation | Isokinetic sampling method and system for multiphase flow from subterranean wells |
US20100145634A1 (en) * | 2007-03-27 | 2010-06-10 | Schlumberger Technology Corporation | System and method for spot check analysis or spot sampling of a multiphase mixture flowing in a pipeline |
US8606531B2 (en) | 2007-03-27 | 2013-12-10 | Schlumberger Technology Corporation | System and method for spot check analysis or spot sampling of a multiphase mixture flowing in a pipeline |
US7845688B2 (en) | 2007-04-04 | 2010-12-07 | Savant Measurement Corporation | Multiple material piping component |
US20120275558A1 (en) * | 2007-08-22 | 2012-11-01 | Luciano Cinotti | Pressurized-water-cooled nuclear reactor with compact steam generators |
US9091486B2 (en) * | 2007-08-22 | 2015-07-28 | Del Nova Vis S.R.L | Pressurized-water-cooled nuclear reactor with compact steam generators |
US20090101018A1 (en) * | 2007-10-23 | 2009-04-23 | Wen-Hwa Wang | Turbulence device used for air filtration system |
US7704293B2 (en) * | 2007-10-23 | 2010-04-27 | Institute Of Nuclear Energy Research | Turbulence device used for air filtration system |
US20100291495A1 (en) * | 2007-11-19 | 2010-11-18 | Sit La Precisa S.P.A. Con Socio Unico | Burner, specifically a premix burner |
CN101874197B (en) * | 2007-11-26 | 2016-02-24 | 罗伯特·博世有限公司 | For measuring the sensor device of the parameter of fluid media (medium) |
US20090199656A1 (en) * | 2008-02-12 | 2009-08-13 | Sunita Rani | Systems and methods for managing pressure and flow rate |
US9038669B2 (en) | 2008-02-12 | 2015-05-26 | Sunita Rani | Systems and methods for managing pressure and flow rate |
WO2009101636A1 (en) * | 2008-02-12 | 2009-08-20 | Rani, Sunita | Systems and methods for managing pressure and flow rate |
US20110179858A1 (en) * | 2008-08-11 | 2011-07-28 | Torsten Mais | Sensor system for determining a parameter of a fluid medium |
WO2010018055A1 (en) * | 2008-08-11 | 2010-02-18 | Robert Bosch Gmbh | Sensor arrangement for determining a parameter of a fluid medium |
US8752420B2 (en) | 2008-08-11 | 2014-06-17 | Robert Bosch Gmbh | Sensor system for determining a parameter of a fluid medium |
US8215345B2 (en) * | 2008-12-19 | 2012-07-10 | Delaware Capital Formation, Inc. | Fuel flow shaper |
US20100154923A1 (en) * | 2008-12-19 | 2010-06-24 | Delaware Capital Formation, Inc. | Fuel flow shaper |
US20100154930A1 (en) * | 2008-12-19 | 2010-06-24 | Delaware Capital Formation, Inc. | Fuel flow shaper |
US8950436B2 (en) * | 2009-07-17 | 2015-02-10 | Buerkert Werke Gmbh | Modularly structured flow conditioning unit |
US20110011479A1 (en) * | 2009-07-17 | 2011-01-20 | Stefan Chalupa | Modularly structured flow conditioning unit |
US8307943B2 (en) * | 2010-07-29 | 2012-11-13 | General Electric Company | High pressure drop muffling system |
WO2013013924A1 (en) | 2011-07-28 | 2013-01-31 | Endress+Hauser Flowtec Ag | Flow rectifier |
DE102011079993A1 (en) | 2011-07-28 | 2013-01-31 | Endress + Hauser Flowtec Ag | Flow straightener |
US8430202B1 (en) | 2011-12-28 | 2013-04-30 | General Electric Company | Compact high-pressure exhaust muffling devices |
US8511096B1 (en) | 2012-04-17 | 2013-08-20 | General Electric Company | High bleed flow muffling system |
US9399951B2 (en) | 2012-04-17 | 2016-07-26 | General Electric Company | Modular louver system |
US8550208B1 (en) | 2012-04-23 | 2013-10-08 | General Electric Company | High pressure muffling devices |
US20150316084A1 (en) * | 2013-01-17 | 2015-11-05 | Canada Pipeline Accessories, Co. Ltd. | Flow Conditioner with Integral Vanes |
US9541107B2 (en) * | 2013-01-17 | 2017-01-10 | Canada Pipeline Accessories, Co. Ltd. | Flow conditioner with integral vanes |
US20160010803A1 (en) * | 2013-03-15 | 2016-01-14 | Institute Of Science And Technology Austria | Eliminating turbulence in wall-bounded flows by distorting the flow velocity distribution in a direction perpendicular to the wall |
US20140338771A1 (en) * | 2013-05-17 | 2014-11-20 | Cameron International Corporation | Flow Conditioner and Method for Optimization |
US9506484B2 (en) * | 2013-05-17 | 2016-11-29 | Cameron International Corporation | Flow conditioner and method for optimization |
US20170074298A1 (en) * | 2013-05-17 | 2017-03-16 | Cameron International Corporation | Flow Conditioner and Method for Optimization |
US9874234B2 (en) * | 2013-05-17 | 2018-01-23 | Cameron International Corporation | Flow conditioner and method for optimization |
US9605695B2 (en) | 2013-05-21 | 2017-03-28 | Canada Pipeline Accessories, Co. Ltd. | Flow conditioner and method of designing same |
US9909213B2 (en) * | 2013-08-12 | 2018-03-06 | Applied Materials, Inc. | Recursive pumping for symmetrical gas exhaust to control critical dimension uniformity in plasma reactors |
US20160208974A1 (en) * | 2013-10-31 | 2016-07-21 | Mitsubishi Hitachi Power Systems, Ltd. | Multistage pressure reduction device and boiler |
US10378566B2 (en) * | 2015-04-01 | 2019-08-13 | Endress+Hauser Flowtec Ag | Flow conditioner |
DE102015105058A1 (en) | 2015-04-01 | 2016-10-06 | Endress+Hauser Flowtec Ag | Flow straightener |
US20180112690A1 (en) * | 2015-04-01 | 2018-04-26 | Endress+Hauser Flowtec Ag | Flow conditioner |
US10036660B2 (en) | 2015-08-20 | 2018-07-31 | Sanyo Denki Co., Ltd. | Measurement device having variable opening orifice for measuring airflow volume and ventilation resistance of wind blowing apparatus |
EP3133299A1 (en) * | 2015-08-20 | 2017-02-22 | Sanyo Denki Co., Ltd. | Measurement device |
CN105444828A (en) * | 2015-08-21 | 2016-03-30 | 宁波市鹏盛科技发展有限公司 | Design method for rectifier of ultrasonic flowmeter |
CN105444828B (en) * | 2015-08-21 | 2018-07-10 | 浙江天信超声技术有限公司 | The design method of the rectifier of ultrasonic flowmeter |
CN105465537A (en) * | 2015-12-31 | 2016-04-06 | 山东思达特测控设备有限公司 | Rectifier with noise eliminating function |
CN105673626B (en) * | 2016-03-31 | 2017-11-10 | 中国海洋大学 | Turbulent flow becomes laminar flow sleeve pipe heating-up temperature field harvester |
CN105673626A (en) * | 2016-03-31 | 2016-06-15 | 中国海洋大学 | Turbulence flow-to-laminar flow casing pipe heating temperature field collection device |
JP6295385B1 (en) * | 2017-04-07 | 2018-03-14 | 清 高浦 | Compressed air pressure stabilizer in air cylinder exhaust chamber |
JP2018179277A (en) * | 2017-04-07 | 2018-11-15 | 清 高浦 | Compressed air pressure stabilizing device in air cylinder exhaust chamber |
US11473711B2 (en) | 2017-10-26 | 2022-10-18 | Performance Pulsation Control, Inc. | System pulsation dampener device(s) substituting for pulsation dampeners utilizing compression material therein |
US11460140B2 (en) | 2017-10-26 | 2022-10-04 | Performance Pulsation Control, Inc. | Mini-dampeners at pump combined with system pulsation dampener |
US11464885B2 (en) | 2018-04-20 | 2022-10-11 | Asahi Kasei Kabushiki Kaisha | Ultraviolet light irradiation device |
US10954976B2 (en) * | 2018-08-08 | 2021-03-23 | Contitech Mgw Gmbh | Device for controlling the swirl of a fluid flowing in a pipeline |
US10704574B2 (en) * | 2018-08-31 | 2020-07-07 | Denso International America, Inc. | HVAC airflow baffle |
US11162613B2 (en) * | 2018-10-26 | 2021-11-02 | Fisher Controls International Llc | Flow conditioner for a valve assembly |
US20200132221A1 (en) * | 2018-10-26 | 2020-04-30 | Fisher Controls International Llc | Flow conditioner for a valve assembly |
US11149893B2 (en) | 2019-04-02 | 2021-10-19 | Endress+Hauser Flowtec Ag | Process connection for connecting a flow measuring device to a pipeline, field device for automation technology and method for fastening a flow rectifier to a process connection |
DE102019108551A1 (en) * | 2019-04-02 | 2020-10-08 | Endress+Hauser Flowtec Ag | Process connection for connecting a flow measuring device to a pipeline, field device for automation technology and a method for fastening a flow straightener to a process connection |
WO2022032622A1 (en) * | 2020-08-14 | 2022-02-17 | 西人马联合测控(泉州)科技有限公司 | Pipe flow rectification device and pipe |
RU2756397C1 (en) * | 2020-09-25 | 2021-09-30 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Apparatus for levelling the speed profile of a liquid or gas flow |
US11591859B2 (en) | 2020-10-12 | 2023-02-28 | Performance Pulsation Control, Inc. | Surface equipment protection from borehole pulsation energies |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3840051A (en) | Straightener | |
US3838598A (en) | Capillary flow meter | |
US9874234B2 (en) | Flow conditioner and method for optimization | |
US4365518A (en) | Flow straighteners in axial flowmeters | |
US5529093A (en) | Flow conditioner profile plate for more accurate measurement of fluid flow | |
RU2392531C2 (en) | Facility for change of direction of medium flow in pipeline | |
US3196680A (en) | Flow tubes | |
US5596152A (en) | Flow straightener for a turbine-wheel gasmeter | |
US9476531B2 (en) | Elliptical flow conditioning pipe elbow | |
US5255716A (en) | Pipe rectifier for stabilizing fluid flow | |
US9625293B2 (en) | Flow conditioner having integral pressure tap | |
GB1566251A (en) | Flow meters | |
US1850030A (en) | Venturi meter | |
US3827461A (en) | Stream filament mixer for pipe flow | |
CA2228928C (en) | Flow conditioner profile plate for more accurate measurement of fluid flow | |
US6644132B1 (en) | Flow profile conditioner for pipe flow systems | |
US5922970A (en) | Vortex flow sensor with a turbulence grid | |
US4254664A (en) | Flow meters | |
CN2935097Y (en) | Slotted orifice plate for multiphase metering device | |
US3373608A (en) | Electromagnetic flowmeter | |
CN108332807B (en) | Throttling assembly, rectification and flow measuring device | |
US4130017A (en) | Flow rate measuring device | |
US1298471A (en) | Pressure-difference-creating device. | |
US3686946A (en) | Flow metering devices of the pressure differential producing type | |
EP0451355B1 (en) | Measuring device for determining the flow of a flowing fluid |