DE2031481A1 - Device for the static measurement of the average density of a liquid circulating in a pipe - Google Patents

Description

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R MOLLER-BORe, DR. MANfTZ. DR. DEUFa 20314 8

DIPL-ING. FINSTERWALD DIPL-INQ. GRÄMKOW • MÖNCHEN 22, ROBERT-KOCH-STR. 1 TELEPHONE 226110

21. JOiBTt

Hl / Sv - S 2159

.SOCIETE GEBEBALB BE 0OHSTRtTOTIOIiS ELECTRIQÖES

ET MECAIfI QÜES (ALSTHOM)

58 Avenue Kleber, Paris 16, France.

Device for static measurement of the mean density a liquid circulating in a pipe

The invention relates to a device for measuring the medium density one in a pipe, for example of an oil pipe type, circulating liquid.

The device according to the invention comprises a first column _t in which circulates a certain flow rate derived from the line, a second column which contains a -vorbe- 'certain amount of a reference liquid and on. its base has a horizontal membrane, on the outer surface of which the pressure of the liquid of the first column acts, a float, which is immersed in the second column up to the vicinity of its bottom and via its top is in connection with a control element of a

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Organs aur regulating the Plüsaigkoitshöhe in, the first pillar to such a value that the hydrostatic pressures equalize on both sides of the membrane, the mean density of the liquid then depending on the height of the liquid in the first column measured from the horizontal plane passing through the membrane.

In such a device there is a moment of equilibrium the ratio of the liquid heights in the two columns under the condition in inverse proportion to the densities of the two liquids that are in the first column derived Burchsabzaenge not at a higher rate than 0.2 ja / sec circulates so that they are not in the liquid level in this column is more sensitive influenced.

Since the height of the liquid in the second column is known, as is the density, the density of the liquid in this column can be determined from the height of the first column.

If the swimmer is given an immersion position ± m essentially the same as that of the liquid column in which he is immersed, the effect of the temperature of the liquid on the position of the swimmer is compensated, because the pressure variations in the swimmer, on the one hand from the change in level of the liquid and on the other result from the change in density of the liquid, compensate you.

In one embodiment of the invention, the of the Line diverted liquid to the base of the first column led, (Jio an overflow of variable height on their oba-

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ren part} the overflowed liquid know into the Line to be thrown back or returned} the regulating organ adjusts the height of the overflow in such a way that the hydrostatic Diniok of the column is equal to that of the second Bfiule will.

In this device, the upper course has a sufficient Length on, so that the strength of the overflowsohioht »u small is to reduce the error resulting from the amendments to this version.

In another Aueführungifoxm the invention, the first ßlult derived from the line 'liquid sugeführt the upper part, the mm from the base of the column is fed into the conduit by means of a volumetriechen * Fuape-'surUok ·} the regulating member thereby etellt the amount of the liquid introduced into the upper part of the column in such a way that the height of the liquid is such that the hydrostatic pressure of this column is equal to that of the wide column.

Di "height of the columns is choose sufficiently large-tu, in the measurement errors in Relatirwert verafeChläseigbar sii maehea.

In one embodiment, you see SätiI = ®, in which the fluid derived from the line circulates, and column _9, which contains the fluid from the plant, is next to each other? eageörd-.net, währeaä ai © in a variant konEent-rioch.'ei & are sorted.

can, who would like, - himself-Kit 4cr eatsoiaaesea ■ Pressure loss that changes the flow rate quantity in the first stage due to the flow, neglected and neglected.

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In fact, the pressure drop is generally due to the low circulation speed of the derived flow rate negligible.

However, in certain cases, especially with viscous liquids, this pressure loss can reach values which are incompatible with the required measurement accuracy are.

Since the pressure loss due to the current in the first column cannot be eliminated, provision is made in accordance with an additional device according to the invention to keep the bridge loss constant in this way; that @r sat usd to correct the measurements "can be taken into account.

In this device, the throughput derived from the line is conducted into the upper part of the rate column, into the first trough with an overflow of variable height, which it has at its upper part; the liquid airkuliert by descends in the column of the "effect of a constant pressure, said underlying between said first overflow and a fe further and NEN with the first fixed networks = overflow · prepared, and the liquid level in the first column is Yerschieben the © advise upper reaches the height geregelb, wherein the level difference awiechea the two overflows, causing the StrÖEtungadruck the liquid, remains constant, as this feat with ejjaesder Yerbun- the bind.

There is a correction term with an icon value for the reading of the liquid level in the first record of the pressure loss that is generated by the liquid circulation: .n iiecer, which is below the constant

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Pressure generated by the difference in level of the two overflows takes place; the correction term can be determined for the purpose of calibrating the system in a previous operation, which consists in measuring the liquid level in the first column, on the one hand, in the static state, the circulation of the diverted liquid being stopped, and, on the other hand, with normal circulation of the diverted flow rate; the difference of the two readings corresponds to the value of the pressure loss, the λ from each Heßab- reading can be removed.

The invention is illustrated below with reference to the drawing, for example described; in this shows:

Fig. 1 is a schematic view of a device according to the invention,

Pig. 2 a schematic partial view of a design variant,

KLg. 3 a schematic partial view of a further construction variant and

Pig. 4 to 6 views analogous to the Pig. 1, each of which relates to three other variants. %

In Pig. 1 shows a part of an oil line 1 which is used for The transport of hydrocarbons is used, the density of which one would like to know permanently.

A small amount of throughput is from the oil line 1 by means of of a pressure reducing valve 3 taken in line 2.

The flow rate is introduced into the base of a column 4-, which has an upper course 5 at its upper part, diö Liquid overflows into a trough 6, from where it overflows a line 7 thrown back into the oil line or fed back will.

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The column 4, the lower part of which is supported by a flexible tube θ is formed is adjustable in height by means of a motor 9 which drives a screw 10, which a nut 11 displaces, which is firmly connected to the column 4 by means of a support 12 on which a scale measuring device 13 indicating the height of the column is attached.

A second column 14 which holds a reference liquid in a contains predetermined level corresponding to the level H, stands with the base of the column 4 via a membrane 15 »which is in their Base is arranged in DruckverMnteng.

A Schwinger 16, which is in the second column to the Boreich from the bottom of which is immersed, is connected via a system of levers 17 to a control element 18 which, by means of a electrical connection 19 controls the rotation of the motor 9 and the screw 10, vas the displacement of the column 4 permitted in height.

The float 16 is in equilibrium position, i.e. without Control the rotation of the motor 9 and therefore without causing it the displacement of the column 4, to a position without deformation of the membrane 15 «tejgeetallfc, vas of equality d« e Pressure of the circulating in column 4, & uf one of them surface-acting liquid and that on the other surface acting liquid corresponds to the reference column · 14. The hydrostatic pressures of the two pillars are yours.

If a pressure difference across the surfaces of the diaphragm 15 corresponding to a change in the density of the column 4 circulating liquid is generated, see the deformed membrane 15 according to the dash-dotted line, changes that Level in the column 14 and moves the float in the Height. This then acts by means of lever 1? on the tax

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organ 18, which the rotation of the motor 9 in a such a direction that it controls the column 4 in height shifts until their hydrostatic pressure equals that of the Reference column 14 is. "

At this moment the ratio of the heights of the columns is inversely related to the densities of the liquids. ·

Since the height of the liquid in column 14 is defined by its solid livemu H and the density of the reference liquid it contains is known, the density of the liquid in column 4 can then be determined by measuring the height of column 4 which starts from the horizontal plane running through the membrane 15 and is given by the level N ^1. This measurement is carried out by reading the measuring device 15.

The flow rate diverted into column 4 also circulates a speed of 0.1 m / aec.

In Fig. 2 a variant is shown in which the base 20 of the

Column 4 is rigid and the upper, the overflow having λ

Part 21 is slidably mounted in the base 20 in the Veiee, that the displacement of the overflow 5 in height by the Motor system 9, not shown, connected to the support 12

is possible. . '■

In Fig. 3 a variant is shown in which the control member Anateeile of the electric motor 9 a servo piston rotor 22 controls, eier through its axis 23 the displacement of the support 12 and consequently the upper part 21 of the column 4 is guaranteed.

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111 figs; 4 shows an embodiment variant in which through line 28 and a pressure reducing valve 3 in the upper part of the column 27 derived from the oil line 1 Liquid is guided at a speed of approximately 0.1 m / sec, which passes through the line 29 Please install a volumetric pump 24 in the oil line is returned.

The control element 18 connected to the float 16 controls the opening of a by means of an electrical connection 19 Slide 25, which controls the supply of liquid to the upper Part of the column 27 regulates in such a way that the balance of the float 16 is ensured, i.e. on one Position without deformation of the membrane 15 'was a hydrostatic pressure of the column 27 equal to that of the reference column is equivalent to.

At this moment it allows the reading of the amount of the Liquid in column 27 by means of level 26, the density of the liquid in the column, as in the case * game of Fig. 1 to derive.

In Fig. 5 a part of an oil line 31 is shown, which for used to transport hydrocarbons, their Dense Ban want to know permanently.

A small amount of through-flow is coming from the oil line. 31 ' enjoyed a line 32 by means of a Bruckreduziesveätils 33.

The throughput quantity is introduced into the first column $ 4, which has an upper course 35 on its upper part j the liquid overflows into a trough 36, from where it flows through the line 37 is thrown back into the oil line or fed back *

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The trough 36 having the overflow 35 is in the manner slidably mounted in the upper part of the column 34 that the displacement of the overflow 35 in height by means of a Electric motor 38 is possible, which the trough 36 »itteis a chain 39, which is carried along by the pinion 40 and guided at 41 and 42.

A dial gauge 43 indicates the height of the column.

A second column 44, which is located inside the column 3 * and contains a reference liquid at a predetermined level corresponding to that live at F, stands with the Base of column 34 in pressure connection via a membrane 45 arranged in its base. '

A float 46 that goes into the second pillar to the neighborhood from the bottom of which is immersed is via a system of levers 47 connected to a control member 48, which means an electrical connection 49 controls the rotation of the motor 38 and the belt 39, which controls the displacement of the Allow overflow 35 having trough 36 in height.

The swimmer 46 is in equilibrium, i.e. without Controlling the rotation of the motor 38 and consequently without causing the displacement of the trough 3OyAUf a position without Deformation of the membrane 45 regulated, which is the equality dea Pressure of the circulating in the column 34, to one of . their surfaces, acting fluids and those on the other Area acting liquid in the Sezugesäule 44 corresponds. The hydrostatic pressures of the two pillars are then & calibration.

Venn creates a pressure differential across the surfaces of the diaphragm 45 will, resulting in a change in the fret of the column

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corresponds to circulating liquid, the membrane 45 deforms according to the dash-dotted line, that changes Height of column 44 and moves the float in height. This then acts by means of the lever 47 on the A controller 48 which controls the rotation of the motor 58 in such a direction that the trough 56 and the Overflow 55 can be shifted in height until the hydrostatic pressure of column 54 is equal to that of reference column 44 will.

At this moment there is the relationship between the heights of the columns in inverse proportion to the densities of the liquids.

Since the height of the liquid in column 44 is defined by its fixed level N and since the density of the reference liquid it contains is known, the density of the liquid in column 54 can then be determined by measuring the height of column 54, which starts from the horizontal plane running through the membrane 45 and is given by the height H ¹ . This measurement is made by reading the measuring device

In Fig. 6, a part «inaröl line 51 is shown, which for the Transport of hydrocarbons is used, the density of which one would like to know permanently.

A small flow rate is generally obtained from the oil line 51 Line 52 taken by means of a pressure reducing valve 53.

The throughput rate is in the trough 56 of an upper course 55 at the top of a column 5 * introduced j the overflowing one Liquid is returned to the oil line through line 57.

The trough 56 having the overflow 55 is in the upper one Part of the column 54 attached in such a way that the gbitead

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Displacement of the overflow 55 in height by means of a β Electric motor 58 is possible, the trough 56 medium » a chain 59, * which is driven by the pinion 60 and is performed at 61 and 62.

A scale measuring device 65 indicates the height of the column.

The meaning of the column 54 stands by means of a flexible, with a tap 67 provided line 66 in connection with a second trough 64 connected to the first trough 56 is firmly connected and contains an overflow 65; the Overflow 65 is a little below overflow 55 Wedged away from this.

The liquid coming from the oil line and into which Theos 56 is introduced with overflow 55 circulates, it flames descends in column 54 and rises again in line 66 to reach second overflow 65 *, this circulation takes place under a constant Pressure loss (h), which corresponds to the constant level difference between the overflows 55 and 65, regardless of the position along the column 54 - of the totality formed by then two overflows 55 and 65? 4.

Bae flow under a low constant pressure h is laminar and it is thus ensured that the Distribution of the pressure loss in the column 54 and the Line 66 remains constant regardless of the geometry of the line 66 and the flow rate variations.

An εwide column 68, which is arranged inside the column 54 eats and drink liquid on a predetermined, contains the height corresponding to level 9, stands

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with the base of the column 54 via a disposed in the base thereof Diaphragm 69 in pressure connection.

A float 70, which is immersed diodes in the second column until the wax ready cash from their ^B is a system · of levers 71 sdt a control member 72, controlling by means of an electrical connection 73, the rotation of the motor 58 and the belt 59, which allow the height of the assembly 74 to be displaced, which has in particular the trough 56 and the overflows 55 and 65.

The float 70 is in equilibrium position, i.e. without Controlling the rotation of the motor 58 and consequently without causing the assembly 74 'to be displaced to one position regulated without deformation of the membrane 69, which corresponds to the equality of the pressure circulating in the column 54, to one of the liquid acting on their surfaces and the one on the other Area acting liquid of the reference column 64 corresponds. The pressures of the two pillars and then the same.

If a pressure difference is produced across the surfaces of the membrane 69, which corresponds to a change in the density of the liquid circulating in the bulge, the membrane 69 moves close to the dashed line, changes the level of the column 68 and displaces the float in the BShe. This then acts by means of the lever 71 on the control member 72 which controls the rotation of Hotore 58 in such a direction that the totality of 74 wa & lasbesondere dtr trough 56 and the overflow are shifted in height 55, the bridge column 54 bie equal that of the Besiägssäule 68.

In these "instant is the ratio of the heights of the columns ia uagekehrten ratio / d s densities of the liquids.

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However, there is a constant pressure loss in the descending order Flow of the liquid in the column 54 under the effect of the pressure (h) is generated and this pressure loss leads to an increase in the height of the liquid in the column 54 © in, which must be deducted systematically with each measurement by means of a correction element.

Since it is known that under the conditions of a laminar Flow in column 54 and line 66 the distribution the pressure loss remains constant in these two sections, the value of the pressure loss in the column 54 is determined by closing the valve 67 so that the circulation of the liquid in the column 54 is stopped, and by measuring the height of the liquid in this column in the static state.

After that, the tap is used to restore circulation opened in the column 54 and again the level of the liquid measured in this column.

The difference between these two readings gives the value dee Correction elementB, which accounts for the constant pressure loss! gruad corresponds to the flow in column 54, that of each Reading must be deducted.

Since the height of the liquid in column 68 is determined by its solid level I and since the density of the reference liquid containing si is known, the density of the liquid in column 54 can then be determined by measuring the height of the Column can be determined, which emanates from the horizontal plane running through the membrane 69 and is given by the level W. This measurement is carried out by reading the measuring device 63, from which the correction element is subtracted, since this corresponds to the pressure loss due to the flow in the column 54 and which has been determined in the manner outlined above.

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In addition, it allows the flow rate diverted into the conduit to be introduced into the upper part of the column 54 · the Elimination of the pulse effect of the pressure reducing valve 53 on the membrane 69 »thereby causing the movement of the float 70 is stabilized.

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Claims (1)

Claims f 1 ^% direction for measuring the mean density of one in one Line circulating liquid, g e k β n n -ζ e i c h η β b through a first column in which one of The small flow rate of this liquid derived from the conduit circulates through a second column which contains a predetermined amount of a reference liquid and to the its base has a horizontal membrane, on the outer surface of which the liquid pressure of the first column acts, by a float that moves into the second column immersed in the vicinity of their bottom and an organ for regulating the liquid level in the first column controls, and by the liquid level in the first column associated display means. 2. Apparatus according to claim 1, characterized in that the derived from the line Liquid is fed to the base of the first column and that these have an upper course of a variable height at its upper part, the overflowing Liquid can be thrown back into the line or fed back and the Hegel organ the height of the Adjusts headwaters in such a way that the hydrostatic The pressure of the column becomes equal to that of the other column. 3- Device according to claim 1, characterized in that g e k e η η ~ ί β i c h η θ t, that in the upper part of the first column * the tone of the conduction fluid is conducted, which is returned from the base of this column into the line by means of a volumetric pump, the Regulating the amount of 00 988 2/1618 BATH ORIGINAL 203H.81 adjusted liquid in the Veise that the The height of the liquid there is such that the hydrostatic pressure of the column is equal to that of the second column. 4. Apparatus according to claim 2, characterized in that g e k e η η - ζ calibrates that the upper course bit of the first column is firmly connected, the height of which is adjustable, whereby the control element adjusts the height of the column. · 5. Apparatus according to claim 2, characterized in that the displacement of the upper reaches By means of an electric motor assigned to the control organ he follows. 6. Apparatus according to claim 2, characterized in that the displacement of the upper reaches A servo-piston motor is arranged by means of a servo-piston motor. 7. Apparatus according to claim 3 »characterized in that the Hegel organ has a slide Φ which controls the amount of in the upper part of the liquid introduced into the first column. 8. Apparatus according to claim 1, characterized in that the two columns side by side are arranged. 9 * Device according to claim 1, characterized in that the two columns are concentric are arranged. 10. The device according to claim 1, characterized in that the derived from the line Flow rate in the upper part of the first column, in 009882/1618 BATH ORIGINAL -.17- is introduced einon first trough with overflow with variable height, which it has at its upper ^one cable, wherein a portion of the flow rate derived circulates by descending in the column tines under the action of constant pressure, the first between de "overflow and * a and that the height of the liquid in the first column is regulated by shifting the height of the first overflow, the difference in level between the two overflows the flow pressure of the liquid in the first column causes »which remains constant because the overflows are firmly connected» · ORIGINAL BATHROOM 0098 8 2/1618 Λ * Empty soap